TH144063A - Diagnostic methods and engine kits for internal combustion engines. - Google Patents

Abstract

DC60 (23/03/57) Microcomputer (21) determines, in the first check subroutine (R2), that the required injection quantity is calculated normally in the fuel injection control subroutine (R1) on the basis of the required injection quantity calculated in the fuel injection control subroutine (R1) and the measured value of the engine operating conditions which is used for the calculation of the required injection quantity in that subroutine; and determines, in the second check subroutine (R3), that injector 14 is driven normally on the basis of the required injection quantity, on the basis of the required injection quantity calculated in the fuel injection control subroutine (R1) and the measured result of the injector drive current application range.

Claims (9)

Claims (all) which will not appear on the advertisement page: edit 23/06/2016 1. Checking device of the engine control unit (20) for Abnormal in the engine control unit where the required injection volume (Qfin) was calculated from the measured value. Of the operating conditions of the engine and Drive the nozzle on the basis of the injection volume Needed to control the amount of fuel injection There are specific characteristics which include: the first defining unit that determines the correct injection volume. Normally calculated by the engine control unit or not, on the basis of the required injection volume which Are calculated by the engine control unit and the measured values of the operating conditions of the The engine is used for the calculation of the required injection volume and the second fault determination unit. That determines that the injector is driven As usual on the basis of the required injection volume? Which is based on the injection volume at Required, which is calculated by the engine control unit and the driven state of the injector. 2. The inspection device of the engine control unit in accordance with claim 1, where in the engine on which the inspection equipment is applied The disaster prevention operation was cheap. It was performed in the first manner when the fault was measured by the first fault determination unit, and the preventive action was performed in a second way that was different from the first. Normal defects can be detected by the second fault determination unit. 3. The engine control unit monitoring device in accordance with claim 1 or 2, where the second fault determination unit receives the driven state of the injector from The measurement results of the current application range at which the driven current is applied to the nozzles. To determine 4. The engine control unit monitoring device according to claim 3, where the second fault-finding unit is given the start and end times of its application. Of the driving current respectively to determine and perform determination and perform calculations for determination, at different time points from different points. At the time when the time began and ended. 5. Engine control unit inspection equipment according to claim 3, where the engine control unit Calculate the time interval to apply current while editing. Based on the fuel pressure being supplied to the injector and a second fault determination unit is made, which is referring to the fuel pressure. 6. The engine control unit monitoring device according to claim 5, where the second fault determination unit is given the start and end times of its application. Of the driving current, respectively, to make determination, and get the fuel pressure at time The same at the start and end time of either the current application was acquired. 7. Engine control unit inspection equipment according to any one of claims 3 to 6 where the engine control unit calculates the current application period at the time of correction. By using individual difference correction values for compensation for each difference in Injector injection characteristics and second fault determination unit refer to each difference correction value when determining. 8. The engine control unit's check device in accordance with any of the clauses 1 through 7, where the engine control unit calculates the required injection volume while making corrections in The term for the engine coolant temperature and the first defining unit. Refer to temperature Engine coolant when determining 9. Method for detecting faults in engine control units (20) that calculate the amount The required injection (Qfin) from the measured value of the operating conditions of the engine and the driven injection method (14) on the basis of the required injection volume to control the amount of fuel injection. It is characterized by which it includes: determination of whether the required injection volume is normally calculated by the control unit. Engine or not This is done on the basis of the required injection volume calculated by the engine control unit and the measured value of the engine operating conditions used for Calculation of the required injection volume and determination of whether the injector is normally driven on the basis of the required injection volume based on the required injection volume calculated by the engine control unit and the driven state of Nozzles -------------------------------------------------- ----------