RU2131547C1 - Transmission stage change-over device - Google Patents

Abstract

FIELD: change-over of transmission stages in transport facilities. SUBSTANCE: device includes source of working fluid whose delivery line is connected with valves which ensure selective connection of stage clutch engagement cylinders with pressure source and hydraulic tank by signal of electric stage selector. Device is provided with correcting valve and stage change-over direction sensor which are electrically connected with stage selector and winding of electromagnet which controls correcting valve fitted between pressure source and delivery line; provision is made for additional line connected with delivery line through check valve. EFFECT: avoidance of jerks of transport facilities in change-over of transmission stages at reduced slippage of friction clutches. 8 cl, 12 dwg

Description

 The invention relates to vehicles, and in particular to gear shifting devices in their gearboxes, carried out by friction clutches activated by hydraulic cylinders when oil is supplied under pressure.

 The hydromechanical transmission / cm is widely known. book Baranova V.V. and others. Three-stage hydromechanical bus transfer. -M .: Transport, 1980, p. 40-43 /, the switching of steps in which is carried out by friction clutches, which are switched on using hydraulic cylinders when oil is supplied to them under pressure by means of electromagnetic valves controlled by a step switch. This transmission does not have devices for smooth pressure changes in these hydraulic cylinders when the friction clutches are turned on. The consequence of this is the "twitching" of the bus during the gearshift in the three-stage transmission of the bus. Especially "twitching" is manifested when switching to lowering steps in the gear.

 Also known is a hydraulic transmission control system for a vehicle by ed. St. N 1789367, each step in the gearbox of which is switched on by two friction clutches. This system provides at each stage a sequential hydraulic inclusion of two friction clutches, but does not have devices for their smooth inclusion. Due to the successive switching on of the friction clutches, the gearshift cannot be ensured without interrupting the power flow.

 ZF hydromechanical gears - Esomat / HP-500 and HP-600 / are widely known, the hydraulic control systems of which have devices for smooth switching on and switching of all stages. The control systems of these gears are very complex, but they also do not provide the required variety of gear shift modes, since the operation of control systems does not take into account the direction of the gearshift. With an increase in the number of gearshift stages, the hydraulic control system for these transmissions is significantly more complicated. In addition, the HP-500 and HP-600 transmissions do not have a hydraulic lock that prevents the possibility of simultaneous full engagement of two stages.

 A device for switching stages in a transmission is known, which contains an oil pressure source, the discharge line of which is connected to valves providing, upon the signal of the electric stage switch, the connection of friction clutch engaging cylinders with said pressure source, hydraulic tank and central valve / see, for example, application N 4026658 in Germany according to F 16 H 59/26 /. This device is intended for transmission, in which one to three friction clutches must be engaged to enable individual stages. It provides reliable hydraulic locking for the selected gear, but does not allow you to get the gearshift without breaking the power flow. The elements for smoothly switching on the steps provided in the device do not have control in the direction of the shift, which does not allow the switching processes to be made optimal in terms of smoothness of switching and limiting the operation of slipping of friction clutches.

 The aim of the present invention is to provide a gearshift device in the transmission, providing smooth inclusion and smooth switching of all steps while reducing slipping in friction clutches, as well as providing gearshift without breaking the power flow. This is achieved by the fact that a different law on and off the friction clutches is organized, taking into account the gear ratio of the engaged stage and the direction of the shift, which is especially effective when switching to a lower gear stage.

 Another objective of the invention is to provide a device for smoothly switching a significant number of stages / 4 or more / without significant complication.

 To this end, the gearshift device in the transmission contains a source of working fluid pressure, the discharge line of which is connected to valves providing, upon the signal of the electric gearshift switch, selective connection of friction clutch engaging cylinders with said pressure source and a hydraulic tank, and also having a gearshift direction sensor electrically connected to a step switch and an electromagnet winding of a correction valve installed between the pressure source and a discharge line and having an additional line connected to the discharge line through a check valve.

 There are options for a stage switching device that provide hydraulic interlock that prevents the simultaneous full inclusion of two transmission stages, as well as regulating the smoothness of the stages, taking into account the degree of fuel supply to the vehicle engine.

 In FIG. 1 shows a kinematic transmission scheme; in FIG. 2 is a schematic diagram of a transmission control device; in FIG. 3 is a schematic diagram of a step switch direction sensor; in FIG. 4 - signal of the direction switching sensor of the stages and the transition process of changing the pressure in the cylinder of inclusion of the friction clutch; in FIG. 5 is a diagram of a transmission control device with a pressure accumulator; in FIG. 6 is a pressure transient in the cylinder for the circuit of FIG. 5; in FIG. 7 is a schematic diagram of a step switch direction sensor responsive to any step switch; in FIG. 8 is a schematic diagram of a device for switching steps without interrupting the power flow; in FIG. 9 is a schematic diagram of a device with pilot valves; in FIG. 10 - kinematic transmission scheme, the inclusion of each stage of which is provided by two friction clutches; in FIG. 11 is a schematic diagram of the transmission control of FIG. ten; in FIG. 12 is a diagram of a gearshift direction sensor for the transmission of FIG. ten.

 Transmission / FIG. 1 / contains an input shaft 1 and an output shaft 2, kinematically connected at various stages by means of gears and friction clutches with cylinders 3-7 to enable these clutches. The arrows show the kinematic relationships between the individual gears. A torque converter 8 can be installed at the input of the transmission.

Step switching device / FIG. 2 / contains a pressure source 9 / pump /, in parallel with which a pressure regulator 10 is connected. The oil for operation is located in the hydraulic tank 11, where oil is drained, for example, from the pressure regulator 10. Cylinders 3-7 are hydraulically connected to the corresponding valves 12-16 also connected to the discharge line 17 and the hydraulic tank 11. The valves 12-16 are controlled by electromagnets 18-22 electrically connected to a battery 23 having a voltage U _a and an electric stage switch 24. Between the pressure source 9 and the discharge the correct line 25 is installed correction valve 25 containing a spring-loaded spool 26. The correction valve 25 has two outputs. The left outlet 27 is connected to the discharge line 17, and the right exit 28 forms an additional line connected to the discharge line through the check valve 29.

 The correction valve 25 is switched by the electromagnet 30 from the signals from the direction switching sensor 31, controlled by communication 32 from the stage switch 24. In the normal position, the pressure source 9 is connected to the discharge line 17 through the outlet 27.

 The direction switching sensor of the steps 31 comprises diodes 33-37 electrically connected to the electromagnets 18-22 / Fig. 3 / and respectively with a step switch 24. Diodes 33-37 are electrically connected to resistors 38-41 and a common resistor 42. Resistors 38-41 are connected through a capacitor 43 and a resistor 44 to a transistor amplifier made, for example, on a transistor 45. Parallel to the input / emitter-base / transistor 45 has a resistor 46 and a zener diode 47. The transistor amplifier made on the transistor 45 responds to the charge current of the capacitor 43. The output of the transistor 45 / collector / is connected to a power amplifier 48, made, for example, in the form of an electromechanical le with a winding 49 and contacts 50, an electromagnet 30 controlling switching of the correction valve 25.

 The diode 51 protects the transistor 45 from the self-induction EMF on the relay coil 49 when the current in the collector circuit of the transistor 45 decreases.

 In the diagram / FIG. 2 / the electromagnet 18 controls the inclusion of the first stage of the transmission through the friction clutch with the cylinder 3. Accordingly, the electromagnet 19 controls the inclusion of the second stage, the electromagnet 20 - III stage, the electromagnet 21 - IV stage. The electromagnet 22 controls the inclusion of reverse gear.

 Selective inclusion of electromagnets 18-22 is carried out by a stage switch 24, the execution form of which can be electromechanical, electronic, etc.

 Resistors 38-41 together with a common resistor 42 / Fig. 3 / are the dividers of the voltage taken from the resistor 42. Moreover, the resistance of each resistor divider corresponding to the stage with a lower gear ratio is greater than the resistance of the resistor voltage divider corresponding to the step with a larger gear ratio. For example, the resistance of the resistor 40 is greater than the resistance of the resistor 39. Therefore, when sequentially switching from stage I to stage IV by the stage switch 24, the voltage across the common resistor 42 decreases stepwise.

 When the stage 24 of the I gearbox is switched on by the switch, the electromagnet 18 is activated and the valve 12 connects the hydraulic cylinder 3 to the discharge line 17. At the same time, voltage U1 appears on the resistor 42, through which the capacitor 43 is charged through the resistors 44 and 46 to voltage U1. Part of the charge current of the capacitor 43 also passes through the control circuit / emitter-base / transistor 45. The transistor 45 opens, the relay 49 is activated and its contacts 50 connect the winding of the solenoid 30 of the correction valve 25 to the battery 23. The electromagnet 30 is activated and the spool 26 moves to the right, connecting the discharge line 17 with the pressure source 9 through the check valve 29.

Since the pressure drop by a value of P _ok occurs on the check valve 29, a pressure P1 lower than the pressure of the power source P _and is created in the discharge line 17. Pressure P1 enters the cylinder 3 of the inclusion of the 1st stage of the transmission. After charging the capacitor 43 to a voltage U1, determined by the duration T1 of the signal from the direction switching sensor of the steps 31, the charge current of the capacitor practically stops and the electromagnet 30 is turned off. In the discharge line 17 and, therefore, in the cylinder 3 of the inclusion of the first stage, the pressure increases to a value of P _and .

In FIG. 4, the upper graph characterizes the signal coming from the direction switching sensor of the steps 31 to the winding of the solenoid 30 of the correction valve 25. The lower graph shows the transient process of changing the oil pressure in the cylinder 3 when the first stage of the transmission is turned on. Thus, when the transmission stage in cylinder 3 is turned on from the neutral I, the oil pressure first increases to the value P1, and after time T1 increases to the value P _and , i.e. with the help of the correction valve 25, a certain stretching occurs in time of the complete inclusion of the first stage of the transmission. The duration of the signal T1 is determined by the parameters of the direction switching sensor of the stages 31, and the pressure P1 is determined by the spring force of the check valve 29.

When switching to the second stage of the transmission, the electromagnet 18 is turned off, and the electromagnet 19 is connected to the battery 23. The cylinder 3 is connected through a valve 12 to a drain in the hydraulic tank. Since when stage II is turned on, the voltage U2 at the common resistor 42 of the direction switching sensor 31 is lower than the voltage U1 to which the capacitor 43 was previously charged, the capacitor 43 is discharged through the resistors 44, 46 and the zener diode 47 to the voltage U2. The transistor 45 remains closed and the signal to the electromagnet 30 of the correction valve 25 is not supplied. Therefore, the pressure P _{and is} maintained in the discharge line 17, which is supplied to the second stage switching cylinder 4.

The switchover from II to III stage and from III to IV stage of transmission is similar. In this case, the capacitor 43 will be gradually discharged to voltages U3 and U4. If you switch from IV to stage III, the capacitor 43 will begin to charge from voltage U4 to voltage U3. Therefore, again briefly for a time T2 / Fig. 4 / the spool 26 of the correction valve 25 will switch and pressure P1 will be supplied to cylinder 5, after which it will increase to pressure P _and .

 The process of switching from III to II stage and from II to I stage of transmission will be similar.

The foregoing shows that when switching any transmission step in the direction of increasing the transmission ratio during the time of action of the signal from the sensor direction of the gear change 31 in the respective cylinders incorporating clutches served only a part / P1 / power source P of _{pressure, and} that provides stretching in process time inclusion of transmission steps. However, when switching the steps in the direction of reducing the gear ratio / i.e. from stage I to stage IV, the total pressure of the power supply P _and is selectively supplied to the clutch engagement cylinders. Thus, the device / Fig. 2, 3 / provides a correction of the process of switching on the transmission steps, taking into account the direction of the stage switching.

 The process of switching on the reverse gear stage occurs similarly to the described process for switching on the first gear, because at the same time, through the diode 37, the same voltage divider is turned on, containing the resistors 38 and 42. When the stage or reverse stage is switched from the neutral position I, the largest voltage U1 is obtained on the resistor 42. This increases the charge time of the capacitor 43 and the associated signal time T1 from the switch direction sensor of the steps 31, which is obtained more than, for example, T2. The zener diode 47 together with the resistor 44 protects the transistor 45 from overvoltage at its input when the first stage and the reverse stage are turned on.

 The circuit of the control device / Fig. 5 / contains a fluid pressure accumulator 52 connected by a channel to an additional line 28, and through a nozzle 53 to a hydraulic tank.

 This control device functionally functions in the same way as the previously described circuit of FIG. 2. In the device of FIG. 5, when the electromagnet 30 moves the spool 26 to the right in the discharge line 17, the pressure will change in accordance with the transient of FIG. 6, which is characterized by a section of a smooth increase in pressure obtained from the pressure P2 determined by the beginning of compression of the spring of the pressure accumulator 52 to the pressure P1.

 After turning off the electromagnet 30 and connecting the discharge line 17 through the outlet 27 to the pressure source 9, the oil from the pressure accumulator 52 through the nozzle 53 is gradually drained into the hydraulic tank and the pressure accumulator is prepared to switch to the next transmission stage. The check valve 29 is closed.

In the device of FIG. 5 for the formation of the transition process of switching on the I stage or reverse stage, as well as when switching to lowering transmission stages, a number of possibilities are used: the signal duration from the direction switching sensor 31, the pressure drop P _ok in the check valve 29, the spring pressure spring 52 and its working volume. This allows in each case to form the optimal transition process of the inclusion of individual stages of the transmission.

 Step direction switch 31 / FIG. 7 / also contains another transistor amplifier made on the transistor 54. The load of the transistor 54 is the previously mentioned power amplifier 48, i.e. transistors 45 and 54 have a common load. At the input of the transistor 54, a resistor 55 and zener diodes 56 and 57 are installed. In addition, the input / base / transistor 54 is connected through a resistor 58 and a capacitor 59 to additional resistor voltage dividers made on resistors 60-63 and having a common resistor 64.

 Resistors 60-63, respectively, through diodes 65-68, are electrically connected to the windings of the electromagnets 18-21. In this case, the resistance of each additional resistor voltage divider corresponding to a stage with a smaller gear ratio is less than the resistance of a resistor voltage divider corresponding to a stage with a larger gear ratio. For example, the resistance of the resistor 60 is greater than the resistance of the resistor 61. Therefore, when sequentially switching from stage I to stage IV by the stage switch 24, the voltage across the common resistor 64 increases stepwise.

 Step direction switch 31 / FIG. 7 / also contains a relay with a coil 69 and normally open contacts 70. When the stage switch 24 is in the neutral / N / position, the coil 69 of the specified relay is connected to the battery 23 and its contacts 70 are closed.

 When you turn on any of the steps in the transmission, the relay coil 69 is turned off and its contacts 70 will be open.

 An additional zener diode 71 is included at the input of transistor 45. In the circuit of FIG. 7 contacts 50 of the relay with a winding 49 are protected from self-induction EMF when the electromagnet 30 is turned off by a diode 72.

 When switching from I to II transmission stage in the direction switching sensor stages 31 / Fig. 7 / the capacitor 59 will begin to charge due to a stepwise increase in the voltage across the common resistor 64 from U1g to U2g. The charge current of the capacitor 59 passes through the resistor 58, and then through the circuit through the resistor 55 and the input / emitter-base / transistor 54. Under the action of the charge current of the capacitor 59, the transistor 54 opens and is fed through the power amplifier 48 to the coil of the solenoid 30 of the correction valve 25, for example, a shorter signal of duration T3 / FIG. 6 /.

 As a result of this, in the device of FIG. 5 a smoother engagement of the transmission stage II occurs / than when using the sensor of FIG. 3 /. Similar signals with a duration of T3 will be supplied to the winding of the electromagnet 30 when switching from stage II to stage III and when switching from III to stage IV of the transmission.

 When the gears are shifted in the direction of increasing the gear ratio, the gearshift direction sensor in FIG. 7 operates similar to the sensor of FIG. 3, as previously stated. In this case, the capacitor 59 will discharge, so the transistor 54 will be closed.

 The foregoing shows that the step direction switch of FIG. 7 provides the various smoothness of engagement of all stages of the transmission necessary for operation, taking into account the direction of the gearshift, which eliminates the appearance of a “jerking” of the vehicle during the periods of switching on and gearshift in the transmission and prevents excessive slipping in the shift stages of the friction clutches.

 When finding the switch stages 24 / Fig. 7 / in the neutral position / N / closed contacts 70 of the relay with winding 69 quickly discharge the capacitor 43, i.e. prepare the direction switch sensor steps 31 to re-enable the I stage or reverse stage. The operation of the gearshift device is considered on the example of a 4-speed transmission, but the actual number of steps in the transmission can be much larger. Moreover, the complexity of the device, providing a smooth inclusion of steps, practically does not depend on the number of switched steps, which distinguishes this device from all known analogues.

 Step switching device / FIG. 8 / contains a channel 73 for draining oil from the pressure accumulator 52 through a correction valve 25. In addition, it contains a parallel-connected nozzle 74 and a drain valve 75, hydraulically connecting the hydraulic tank II to the valve 12 for switching on the first stage of the transmission. In this case, the drain valve 75 through the channel 76 is controlled by the oil pressure in the discharge line 17.

A drain valve 77, connected in parallel with the nozzle 78, hydraulically connects to the hydraulic tank 11 a valve 13 for enabling the second stage of the transmission. Drain valve 77 through channel 79 is also controlled by oil pressure in discharge line 17. Drain valves 75 and 77 are controlled by pressure P _y , where P2 <P _y <P _and . If the pressure in the discharge line 17 is less than P _y , then the drain valves 75 and 77 are closed, and if the pressure in the discharge line 17 is greater than P _y , then the drain valves 75 and 77 are open and together with the nozzles 74 and 78 drain the oil from valves 12 and 13 to the hydraulic tank.

Thus, when switching from stage I to stage II and from stage II to stage III, i.e. in the direction of reducing the gear ratio of the transmission, oil from the shut-off cylinders 3 and 4 / with the sensor of FIG. 7 / will merge in two stages. First, only through the nozzles 74 and 78, and when the pressure in the discharge lines 17 is greater than P _y and through the valves 75 and 77. Such an embodiment of the stage switching device / Fig. 8 / provides drainage of oil from turn-off cylinders 3, 4, with a certain time delay controlled by pressure P _y , which allows the transmission stages to be switched without breaking the power flow.

 The device of FIG. 8 also provides switching of the co stage II to the first stage of the transmission without interrupting the power flow. Naturally, other cylinders / 5, 6 / for switching on the friction clutches of the transmission can be equipped with drain valves.

 The introduction of the channel 73 for draining oil from the pressure accumulator 52 eliminates the parasitic leakage of oil through the nozzle 53 / Fig. 5 / when switching by the solenoid 30 of the correction valve 25 and reduces the time of draining the oil in the hydraulic tank, i.e. accelerates the preparation of the pressure accumulator 52 for switching a new stage in the transmission.

 In the gear shifter / FIG. 9 / cylinders 3-7 are hydraulically connected to respective pressure controlled valves 80-84 installed in series in discharge line 17. Valves 80-84 are also hydraulically connected to the hydraulic tank. Valves 80-84 are controlled hydraulically using pilot valves 85-89 through channels 90-94. The pilot valves 85-89 are also hydraulically connected to a pressure source 9 and a hydraulic tank 11.

 Switching of the pilot valves is carried out using electromagnets 18-22, the windings of which are electrically connected to the accumulator 23 and the electric stage switch 24. The serial connection of the valves 84, 80-83 in the discharge line 17 provides hydraulic blocking from the complete simultaneous inclusion of two stages of the transmission. For example, if valve 83 is turned on and discharge line 17 is connected to cylinder 6, then all other valves 84, 80-82 will be disconnected from discharge line 17.

 When the 1st stage of the transmission is turned on, the stage switch 24 supplies the winding of the electromagnet 18 with voltage from the battery 23. The pilot valve 85 switches and connects the pressure source 9 to the valve 80. The valve 80 disconnects the valve 84 from the discharge line 17 and connects it to cylinder 3. Further, the process pressure changes in the cylinder 3 proceeds in accordance with the transient process of FIG. 6, which was previously described in detail.

 When switching from the first stage to the second stage of the transmission, the coil of the electromagnet 18 is turned off, and the winding of the electromagnet 19 is connected to the battery 23. As a result, the valve 81 / Fig. 9 / disconnects the discharge line 17 from the valves 80, 84 and connects it to the cylinder 4 of the inclusion of the second stage of the transmission.

 The transient process of changing the pressure in the cylinder 4 when the second stage of the transmission is turned on occurs in accordance with FIG. 6. The oil from the previously turned on cylinder 3 is discharged into the hydraulic tank through the nozzle 74 and controlled by the pressure in the discharge line 17, the drain valve 75, which opens with a certain delay in time. Therefore, the entire process of switching from I to II transmission stage occurs without breaking the power flow.

 Otherwise, the step switching device of FIG. 9 operates similarly to the previously described device of FIG. eight.

 Naturally, drain valves with parallel-connected nozzles can also be installed on other valves for activating transmission stages. Thus, the step switching device of FIG. 9 provides a smooth switching of stages without breaking the power flow in the presence of hydraulic blocking from the complete simultaneous inclusion of two stages, which is not achieved in known devices.

 Currently, the kinematic transmission scheme / FIG. 10 /, for example, in the automotive industry, the inclusion of each stage of which is performed by two friction clutches having cylinders for engaging these friction clutches.

 In the transmission / FIG. 10 / at all forward stages selectively activated by cylinders 3-6, a central friction clutch controlled by cylinder 95 should also be included, which is provided by a stage switch 24, an electromagnet 96 and a valve 97 / Fig. eleven/.

 At the reverse stage, the stage switch 24 includes two friction clutches controlled by cylinders 3 and 6, which is ensured by the introduction of additional diodes 98 and 99 connected to each other / Fig. eleven/.

 Since the central friction clutch controlled by cylinder 95 is always fully engaged in forward gears, it does not affect the gearshift process. Therefore, the control device of FIG. 11, when switching the forward stages, works similarly with the previously described device of FIG. 5.

 When the reverse stage is switched on, the stage switch 24 connects the windings of the electromagnets 18 and 21 to the accumulator 23 through the additional diodes 98 and 99. At the same time, the common resistor 42 is connected to the accumulator 23 through the diode 33 and resistor 38, as well as through the diode 36 and resistor 41 i.e., in the sensor 31, two resistor voltage dividers are simultaneously turned on / Fig. 12/. In this case, the voltage drop across the common resistor 42 will be slightly larger than when the I stage is turned on, so the duration of the signal supplied from the switch direction sensor 31 / will also slightly increase. 12 / to the winding of the electromagnet 30 of the correction valve 25.

 Step direction switch 31 / FIG. 12 / also contains a resistor 100 connected to a common resistor 42 and a capacitor 43 by a switch 101 controlled from the fuel supply pedal 102 to the vehicle engine.

 When the contacts of the switch 101 are closed, the charging time of the capacitor 43 is reduced, therefore, the duration of the signal from the direction switching sensor 31 to the winding 30 of the correction valve 25 is reduced, which further regulates the smoothness of switching on and switching the transmission steps.

 The foregoing shows that the gearshift device in the transmission of FIG. 2, 5, 8, 9, 11 together with the direction switching sensor of steps 31 of FIG. 3, 7, 12 makes it possible to realize a very wide range of possibilities for ensuring, in each case, the optimal smoothness of switching on and shifting the steps in the vehicle’s transmission. This leads to the elimination of excessive slippage in the friction clutches, including transmission stages. It should be especially noted that the complexity of the switching device is practically independent of the number of gear stages that can be used in multi-stage transmissions.

 An option has been considered that makes it possible to additionally obtain hydraulic blocking of valves, including friction clutches of transmission stages when they are switched without interrupting the power flow.

Claims (8)

 1. A gear shifting device in a vehicle transmission comprising a source of working fluid pressure, the discharge line of which is connected to valves providing, upon a signal from the electric gear selector, a selective connection of the step cylinder of the friction clutches with said pressure source and hydraulic tank, characterized in that it is equipped with a corrective a valve and a step switch direction sensor electrically connected to a step switch and an electric winding rot corrective control valve placed between the pressure source and the discharge line and with the additional line connected to the discharge line via a check valve.  2. The device according to claim 1, characterized in that it is equipped with a liquid pressure accumulator connected by a channel to an additional line and through a nozzle to a hydraulic tank.  3. The device according to claims 1 and 2, characterized in that the fluid pressure accumulator is connected to the hydraulic tank by a channel through said correction valve.  4. The device according to paragraphs. 1 to 3, characterized in that it is equipped with a parallel connected drain valve and a nozzle hydraulically connecting the hydraulic tank to the valve, while the control of the drain valve is provided by the pressure of the working fluid in the discharge line.  5. The device according to claims 1 to 4, characterized in that the step switching direction sensor comprises electric circuits connected through diodes to the valve solenoids containing resistor voltage dividers having a common resistor, and a capacitor is connected between the voltage divider resistors and a common resistor, which through a resistor is connected to the input of a transistor amplifier controlled by a capacitor charge current, the output of which through a power amplifier is connected to the winding of the correcting electromagnet Lapa.  6. The device according to claims 1 and 5, characterized in that a resistor controlled from the fuel supply drive to the engine of the vehicle is installed in said step direction switch between a common resistor and a capacitor.  7. The device according to claims 1, 5 and 6, characterized in that said step direction sensor also comprises additional resistor voltage dividers connected through diodes to the valve solenoid coils, having a common resistor to which a capacitor is connected, through a resistor connected to the input of another a transistor amplifier controlled by the charge current of this capacitor, the output of which is connected to the power amplifier.  8. The device according to claims 1 to 3, characterized in that it is equipped with pilot valves, hydraulically connected to the hydraulic tank and the pressure source, controlled by a step switch, while the pressure-controlled valves are installed in the discharge line in series and are controlled from the pilot valves .

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