TWI461322B - The determining method of the driving habits - Google Patents

Description

Method of judging driving habits

The invention is a monitoring method and system for directly determining whether the driving behavior is excellent by using the driving information provided by the onboard diagnostic system.

There are quite a lot of research literatures on driving behavior, whether it is fatigue driving research, such as the US Patent No. 7034697, which estimates the driver's mental state through the state of the car's movement, and then, as in the Republic of China's patent application number 096127932, the lateral deviation of the use of transportation vehicles. The shifting and biasing angles are used to determine the driving mental state and the like.

Use GPS information combined with vehicle diagnostic system and install a number of additional devices such as collision sensing, pedal sensing, steering wheel sensing and reversing radar to judge the driving history and recorders such as the Republic of China application for patent number 096122400 "vehicle information driving behavior record "Device" is a vehicle recorder.

Different from previous driving behavior related research, it is rare to study driving habits, and most of the previous driving behavior related researches need to add sensing components to increase the complexity. The present invention does not add additional sensing components, only the onboard diagnostic system. There is information to interpret the driver's driving habits.

A poor fuel-consuming driving habit, driving habits of frequent slamming or frequent slamming of the throttle, the slamming of the car will cause the engine speed to decrease instantaneously, and the slamming of the throttle will cause the engine speed to increase instantaneously, thus judging the engine speed change rate or the accelerator pedal change. The rate will be the most convenient way to judge whether or not the fuel consumption is bad.

Dangerous driving habits that are often seen on the road, such as over-bending cars When you quickly add the throttle, you will immediately step on the brakes. Of course, this bad driving habit also occurs in any lane change. Especially in any lane with a large traffic flow, it is also common to quickly step on the brakes after the rapid fueling, so the throttle is judged at the same time. The pedal change rate and the car speed change rate, that is, it is easy to judge such dangerous driving behavior, and the simplest judgment method is to obtain the product of the above two. Because of this rapid behavior, the accelerator pedal change rate will be higher than the car engine speed change rate. It comes quickly, so the product of the rate of change of the accelerator pedal and the rate of change of the speed of the car will be more accurate than the product of the rate of change of the engine speed and the rate of change of the speed of the car.

Due to different road conditions, such as special traffic conditions that require emergency braking or the car to start on the uphill slope, it is impossible to judge the driving habits only by the short-term change rate. Therefore, it is necessary to add a certain time or the distance of the vehicle, which can be read according to the information distance of the car. To convert to the number of times to be accumulated N; the accumulation of information change rate is a kind of signal low-pass filtering meaning, so the sporadic special road conditions will be diluted by the accumulation, just like the effect that the glitch is filtered by the low-pass filter, so accumulate The action is also a very important point of view of the present invention, and also makes the judgment of bad driving habits more accurate.

The "method and device for judging driving habits" of the present invention is a method for calculating the time change rate by using the accelerator pedal position, the car speed and the engine speed which are provided by the on-board diagnostic system OBD II, and performing an accumulating action to eliminate the sudden change Send road conditions or special road conditions as a way to correctly judge bad driving habits.

Please refer to the first figure, read the car pedal position data (set to P _N-1 ), the car speed (set to V _N-1 ) and the car engine speed (set to RPM _N-1 ) from the [11] on-board diagnostic system. Then; delay a small time interval ΔT[12], △T must be much smaller than the time required to pedal the accelerator pedal (for example, take 0.2 stroke time is a reasonable value), so as to ensure the car driving Information such as P _N-1 , V _N-1 , RPM _N-1 can get the correct information change rate information; [13] read the onboard diagnostic system to read the car pedal position data (set to P _N ), car speed (set to V) and car engine speed (set to RPM); this can calculate the rate of change of the accelerator pedal, car speed, car engine speed, etc. [14], the rate of change is the mathematical differential effect, so you can get driving In order to judge the dangerous driving behavior caused by the driver suddenly accelerating and slamming the brakes in a short period of time, the throttle pedal change rate is multiplied by the vehicle speed change rate, and the acceleration or deceleration is a change in driving behavior, so the absolute behavior is taken. The value [15] is used as the cumulative action to become the cumulative amount [1] 7], the physical meaning of low-pass filtering is accumulated. If the cumulative number of times is too low, the sudden occurrence of the vehicle will be misjudged as poor driving habits. If the cumulative number is too high, some driving habits are not easy to detect, so it is necessary to set a desire. A reasonable range of cumulative times, of course, if the user has special needs, the cumulative number of times can be adjusted appropriately, and the cumulative number of times is a set time interval.

By comparing the above accumulated amount with the critical set value [18], if the accumulated amount is greater than the critical set value (refer to the second figure), it can be judged that the driving habit is bad, and the critical set value can set several road conditions for the driver to select according to the road condition, because Different road conditions need to be used for braking or starting frequency. For example, mountain roads often need to be decelerated because of turning. If there are more traffic lights driving in urban areas, there are often traffic lights waiting for green lights and green lights. There are more changes in the aforementioned car information.

Of course, as shown in the third figure, it is not a good driving habit or a poor driving dichotomy. The vehicle information and the critical set value are displayed in a similar percentage manner. It is easier to understand whether the driver's driving behavior is good or not. .

11‧‧‧Read car information

12‧‧‧ Delay a very short time interval △T

13‧‧‧Read the car information again

14‧‧‧Change rate of accelerator pedal, car speed, car engine speed, etc.

15‧‧‧The absolute value of the accelerator pedal change rate and the car speed change rate

16‧‧‧To count

17‧‧‧ Calculate the accelerator pedal change rate, the accelerator pedal change rate and the car speed respectively Cumulative amount of change rate product and engine speed RPM change

18‧‧‧Enter critical setpoint

21‧‧‧Check whether the cumulative amount of the absolute value of the accelerator pedal change rate reaches the critical set value

22‧‧‧Check whether the cumulative amount of absolute value of engine speed per unit time change reaches the critical set value

23‧‧‧Check whether the cumulative amount of the absolute value of the product of the accelerator pedal change rate and the car speed change rate reaches the critical set value

24‧‧‧Shows poor fuel-consuming driving habits

25‧‧‧Shows poor fuel-consuming driving habits

26‧‧‧Shows dangerous driving habits

31‧‧‧The accelerator pedal change rate, the accelerator pedal change rate and the car speed change rate product, the engine speed RPM change amount cumulative amount and the critical set value are normalized to adjust the driving habits

32‧‧‧Shows poor driving habits

The first figure is a flow chart of the present invention mainly reading information on the onboard diagnostic system and processing the information.

The second picture is a flow chart of processing one of the methods for judging driving failure.

The third picture is a flow chart of another method for processing information to determine poor driving.

11‧‧‧Read car information

12‧‧‧ Delay a very short time interval △T

13‧‧‧Read the car information again

14‧‧‧Change rate of accelerator pedal, car speed, car engine speed, etc.

15‧‧‧The absolute value of the accelerator pedal change rate and the car speed change rate

16‧‧‧To count

17‧‧‧ Calculate the cumulative amount of the accelerator pedal change rate, the accelerator pedal change rate and the vehicle speed change rate, and the engine speed RPM change

18‧‧‧Enter critical setpoint

Claims (5)

A method for judging driving habits, the judging method comprising the following steps: (A) capturing on-board diagnostic system OBDII accelerator pedal position information, vehicle speed and car engine speed RPM; (B) small time interval in a very short time △ T repeatedly captures the onboard diagnostic system OBDII pedal position information, car speed and car engine speed RPM, the value of △T must be much smaller than the time required for the accelerator pedal to be stepped on from the top, such as the aforementioned 0.2 times time; C) Repeat the calculation of the (A) (B) two-step accelerator pedal position change amount, that is, the difference between the last pedal position information and the previous pedal position information divided by the time interval ΔT, repeated calculation (A) (B) The two-step car speed change is the difference between the last car speed and the previous car speed divided by the time interval ΔT, and the repeated (A) (B) two-step car engine speed RPM change is the last time The difference between the engine speed RPM and the previous engine speed RPM divided by the value of the time interval ΔT; (D) repeating the above steps (A) (B) and (C) and recording, proceed to the next step; (E ) According to the amount of change in pedal position When the accumulated amount reaches the critical set value within the set time interval or the absolute value of the RPM change amount according to the engine speed of the vehicle reaches the critical set value within the set time interval, the driving habit of fuel consumption can be judged to be poor; (F) according to the change of the pedal position When the cumulative amount of the absolute value of the product of the amount and the change in the speed of the vehicle reaches the critical set value within the set time interval, it can be judged that the dangerous driving habit is poor. The method for judging driving habits as recited in claim 1, wherein the set time period of the step (E) allows the driver to select or set the time interval by the driver according to the road condition option. The method for judging driving habits as recited in claim 1, wherein the set time period of the step (F) allows the driver to select or set the time interval by the driver according to the road condition option. For example, in the method for judging driving habits as described in claim 1, wherein the cumulative amount in the set time interval of the step (E) can be further adjusted according to the cumulative amount and the critical set value, for example, by percentage Representation to display it Poor driving habits of fuel consumption. The method for judging driving habits as described in claim 1, wherein the absolute value of the product of the pedal position change amount and the vehicle speed change amount in the step (F) is accumulated in the set time interval, and further The cumulative amount is adjusted to a critical setting, such as a percentage representation to show the degree of risk of driving habits.