CN115092105B

CN115092105B - Automatic adjusting method for automobile brake pedal feel and automobile

Info

Publication number: CN115092105B
Application number: CN202210898470.9A
Authority: CN
Inventors: 张勇; 黄冬冬; 钱兴发
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2023-09-26
Anticipated expiration: 2042-07-28
Also published as: CN115092105A

Abstract

The application discloses an automatic adjustment method for automobile brake pedal feel and an automobile, wherein the method comprises the following steps: and acquiring habit data of a driver in the braking process, and adjusting the existing braking Map based on the habit data so that the braking Map accords with the habit of the driver. The application has the advantages that: the braking Map is adjusted according to the data of each braking, so that the braking Map is more in line with the habit of a driver, and the user experience is improved; and the brake Map of each person can be matched through face recognition, so that the personalized adaptation of the brake Map to each person is ensured, and the intelligent degree of the vehicle is improved.

Description

Automatic adjusting method for automobile brake pedal feel and automobile

Technical Field

The application relates to the field of automobile brake pedal teaching, in particular to an automatic automobile brake pedal feel adjusting method and an automobile.

Background

The current brake pedal feel is adjusted and frozen according to manufacturers, and only one pedal feel is needed after the measurement. The driving habits of everyone are different, and a pedal feel cannot meet the needs of the public. Generally, a male driver likes a pedal feel with a large braking force, and a female driver likes a pedal feel with a small braking force. At present, the road is intricate and complex, the power of the vehicle is improved, and the pedal feeling brought by the vehicle is also required to be synchronously lifted. However, the feeling of pedal is very hard to adjust, and the vehicle enterprises can also cause complaints: the after-market problems of insufficient braking force, too sensitive braking response, soft braking and the like are solved, how to solve the pedal feel is important for improving user experience, and the prior art generally only has a fixed braking feel, so that the self-adaptive braking feel requirement of a customer cannot be met.

Disclosure of Invention

The application aims to overcome the defects of the prior art and provides an automatic adjusting method for the feel of a brake pedal of an automobile and the automobile.

In order to achieve the above purpose, the technical scheme adopted by the application is as follows: an automatic adjustment method for the feel of a brake pedal of an automobile comprises the following steps:

and acquiring habit data of a driver in the braking process, and adjusting the existing braking Map based on the habit data so that the braking Map accords with the habit of the driver.

After the vehicle is started, the personalized braking Map matched with the driver is obtained through identification for braking control, habit data of the driver is detected in the braking process, and the personalized braking Map is adjusted.

And when the personalized braking Map corresponding to the identity information is not acquired during the identity identification, taking the stored standard braking Map as the personalized braking Map corresponding to the identity information.

The brake ECU outputs a brake torque according to a brake Map, which is a pedal stroke-brake torque relationship Map, and adjusts a relationship between the pedal stroke and the brake torque by adjusting an existing brake Map based on habit data.

Brake pedal travel data and deceleration signals are collected at each brake to characterize the driver's habits, and then the brake Map is adjusted based on the driver's habits.

And collecting brake pedal travel data and deceleration signals during each braking, and increasing or decreasing the braking torque in the braking Map according to the collected brake pedal travel data and deceleration signals.

The number of braking of the vehicle is detected during each vehicle trip, and the braking torque in the braking Map is adjusted based on the number of braking.

And in the one-time driving process, comparing the braking times with a braking times threshold value, and when the braking times threshold value is larger than the braking times threshold value, regulating the braking torque in the braking Map.

And after each braking or each stopping, matching the regulated braking Map with the identity information and storing.

An automobile, the automobile is a method for automatically adjusting the brake pedal feel of the automobile.

The application has the advantages that: the braking Map is adjusted according to the data of each braking, so that the braking Map is more in line with the habit of a driver, and the user experience is improved; and the brake Map of each person can be matched through face recognition, so that the personalized adaptation of the brake Map to each person is ensured, and the intelligent degree of the vehicle is improved.

Drawings

The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:

FIG. 1 is a schematic diagram of an automatic adjustment method for the feel of a brake pedal of an automobile according to the present application.

Detailed Description

The following detailed description of the application refers to the accompanying drawings, which illustrate preferred embodiments of the application in further detail.

The application aims to add a strategy for automatically adjusting the brake pedal feel of an automobile, which is only suitable for braking in normal driving conditions, and emergency braking is not in the category. After the system collects and analyzes the braking actions of the driver, the system gives the best pedal feel suitable for driving, and the satisfaction degree of the driver on braking can be improved. The emergency braking means that the pedal stroke change rate is larger than a certain change rate threshold value, the pedal stroke change rate is judged to belong to the emergency braking at the moment, and the application adopts a preset standard braking Map to carry out braking control during the emergency braking.

In a normal state, after the vehicle leaves the factory, a host factory uniformly adjusts and sets a standard brake Map to be stored in a brake ECU, wherein the standard Map refers to a curve corresponding to the brake pedal travel and the brake torque or a one-to-one corresponding comparison table, brake pedal travel data acquired during braking is then used for acquiring the corresponding brake torque based on the standard brake Map and then outputting the brake torque to realize braking, and as the pedal travel is changed in real time, the brake torque is changed in real time to control the braking of the vehicle. However, in this case, the habit of each person cannot be adapted easily, and some people like to quickly slow down and some people like to meet the slow down, so in order to adapt to each person, the automatic adjustment method for the automobile brake pedal feel is provided, and the specific scheme is as follows:

first, a standard brake Map for realizing brake control of the vehicle is calibrated in advance in a brake ECU at the time of shipment of the vehicle.

When the vehicle is used, after the vehicle is started each time, the vehicle-mounted face recognition system can carry out face recognition on the driver to judge the identity information of the driver at the moment, then the personalized braking Map matched with the driver is obtained through the identity recognition to carry out braking control, and habit data of the driver is detected in the braking process to regulate the personalized braking Map.

When a driver uses the vehicle for the first time or a new driver uses the vehicle, if the face recognition does not reach the corresponding identity information, the brake ECU matches a standard brake Map for the driver as a personalized brake Map; the standard braking Map accords with the personalized braking Map used by the driver through the adjustment travel of the driver data in the driving process, the braking Map is stored in the brake ECU and is matched with the identity of the driver, and when the driver uses again next time, the corresponding personalized braking Map is obtained through direct identity recognition, so that the personalized braking Map is matched.

And when the personal braking Map corresponding to the identity information is not acquired during the identity recognition, taking the stored standard braking Map as the personal braking Map corresponding to the identity information, acquiring braking parameters in real time to represent habit data of a driver during driving of the driver, and adjusting the existing braking Map based on the habit data so that the braking Map accords with the habit of the driver.

At each braking, the driver is pedaled deeply to brake and is pedaled shallowly to meet the habit requirements of the user by collecting the data and fine-tuning the stored personalized braking Map.

The application relates to a brake ECU (electronic control unit), which is used for outputting brake torque according to a brake Map stored in the ECU during braking, wherein the brake Map refers to a relation Map between pedal travel and brake torque, the existing brake Map for adjusting data acquired in the braking process after braking is finished is used for adjusting the relation between the pedal travel and the brake torque.

The application can adjust the personalized braking Map in two ways:

1. and collecting brake pedal travel data and deceleration signals to represent the habit of a driver during each braking, and then adjusting the braking Map based on the habit of the driver to increase or decrease the braking torque in the braking Map. When the brake pedal stroke is detected to be deeper during one-time braking, if the brake pedal stroke is larger than a set pedal stroke threshold value, the brake torque value is finely adjusted while the pedal stroke is kept unchanged for a brake Map, wherein fine adjustment refers to corresponding brake torque increase torque t under the same pedal stroke data, and t is a nominal small torque value; otherwise, finely adjusting the reduction torque t, and uniformly reducing the braking torque corresponding to the pedal stroke in the Map by the torque t.

2. The number of braking of the vehicle is detected during each trip of the vehicle, and the braking torque in the braking Map is adjusted based on the number of braking.

The process of each stroke refers to a process that the brake ECU detects that the vehicle is turned off from start to stop, in the process of one running, the braking times are compared with a braking times threshold, when the braking times threshold is larger than the braking times threshold, the braking torque in the braking Map is increased, namely the braking torque is increased by keeping the pedal stroke parameter unchanged in the braking Map stored in the brake ECU after the braking is finished, the adjusting size of each time is the torque t, and the torque t can be calibrated.

After each fine adjustment of the brake Map, the updated brake Map is stored in the brake ECU, and the Map can be used for the next braking or the next use of the vehicle. The storage of the fine-tuned personalized Map is matched with the identity information during storage, so that the corresponding personalized braking Map can be obtained directly based on the identity detected by face recognition when the vehicle is used next time.

In a preferred embodiment of the application, the brake ECU stores a standard brake Map, and when the brake pedal change rate is greater than the set change rate during the present braking, the brake ECU is in emergency such as emergency braking, and braking is required to be performed according to the standard brake Map calibrated by the manufacturer to ensure braking safety, so that safety risks caused by personalized brake maps are avoided.

In a preferred embodiment, in consideration of safety requirements and regulatory requirements, in the adjusted brake Map, the torque which is increased or decreased by fine adjustment while maintaining the brake pedal stroke parameter unchanged is between the torque value ± nt in the standard Map, that is, the upper limit value and the lower limit value of the brake adjustment of the personalized brake Map are set, so as to avoid occurrence of safety accidents, for example: in the standard brake Map, the brake torque corresponding to the pedal stroke a is b; there are countless curves of such corresponding point strokes in Map; when the torque b corresponding to the pedal stroke a is adjusted, the braking torque corresponding to the pedal stroke a is limited to b-nt to b+nt. The limiting of the upward regulation and the downward regulation of the braking torque is realized through calibration, and the defects that the unrestricted school adapts to the safety risk of the vehicle caused by the habit of a driver and does not meet the regulation requirement are avoided.

Acquired through habit of a driver: after the pedal stroke, the braking deceleration and the braking switch signals obtain braking information such as the frequency of stepping on the brake, the braking system automatically recommends proper pedal feel under the condition of meeting regulations and safety, repeatedly iterates through feedback of a driver for a plurality of times, and finally recommends optimal pedal feel.

Fig. 1 is a schematic diagram of the principle of a pedal feel control strategy. The system shown in fig. 1 includes: a driver 1; a pedal stroke sensor 2; a brake signal 3; a deceleration signal 4; the brake ECU5, the recommended solution 6, the storage 7, the face recognition system 8, the targets (different drivers) 9.

First, the driver 1 performs normal braking, and data of each braking includes: the pedal stroke sensor 2, the braking signal 3 and the deceleration signal 4 are sent to the braking ECU5, and the ECU performs analysis on default pedal feel data of the system according to data fed back by a driver to meet the requirements of the driver, wherein the default pedal feel data comprises a series of working conditions such as various working conditions of braking, high-speed, low-speed, urban traffic lights and the like. For example, 1: in the one-time braking process, the driver's demand level can be determined based on the linearity of the pedal stroke sensor 2 and the deceleration linear signal 3, and the ECU5 performs system adjustment for the brake data collected this time. The data obtained by braking at this time (under the same working condition) and the scheme recommended by the ECU5 are iterated repeatedly until the data of the two are linearly matched. For example 2: the ECU obtains the braking times according to the braking signals 2 in the process of one stroke of the driver, and the braking times are measured based on a database to be reasonable. For this condition, the ECU5 is adapted to increase the braking force to decrease the number of times of braking by the driver. This approach also requires iteration and verification and is performed in the manner described above with reference to example 1. After scheme verification is finished, namely, after each braking is finished, one adjusted Map is used as a recommended braking scheme, then the recommended target is determined through face recognition when the vehicle is used next time or the vehicle is operated next time, and then a matched personalized braking Map is found based on the face. The above example is a pedal feel scheme customized according to the driving habits of driver a, and so on, the system may customize the pedal feel of each driver, such as driver B, driver C, and so on. The system is used in the automobile industry. The driver can drive any car at will, and the ECU5 automatically recommends pedal feel through the internet connection system, so that the driving experience is better.

The application discloses a strategy for automatically adjusting the feel of an automobile brake pedal. The application does not involve the expense of mould opening, cost and the like, has relatively low implementation cost, and can be realized by only adding one strategy and changing control software. The safety aspect is free from risks, and development can be implemented.

It is obvious that the specific implementation of the present application is not limited by the above-mentioned modes, and that it is within the scope of protection of the present application only to adopt various insubstantial modifications made by the method conception and technical scheme of the present application.

Claims

1. An automatic adjustment method for the feel of a brake pedal of an automobile is characterized by comprising the following steps:

acquiring habit data of a driver in a braking process, and adjusting the existing braking Map based on the habit data so that the braking Map accords with the habit of the driver;

collecting brake pedal travel data and deceleration signals during each braking, and increasing or decreasing the braking torque in a braking Map according to the collected brake pedal travel data and deceleration signals; when the brake pedal stroke is detected to be larger than a set pedal stroke threshold value during one-time braking, the brake pedal stroke is kept unchanged in a brake Map to finely adjust a brake torque value, wherein fine adjustment refers to corresponding brake torque increase torque t under the same pedal stroke data, and the torque t is a nominal tiny torque value; otherwise, finely adjusting the reduction torque t, and uniformly reducing the braking torque corresponding to the pedal stroke in the Map by the torque t;

after each braking or each stopping, matching the adjusted braking Map with identity information and storing; in each stroke process, the brake ECU detects that the vehicle is turned from start to flameout to be in a stroke process, in one time, the braking times are compared with a braking times threshold, when the braking times are larger than the braking times threshold, the braking torque in the braking Map is increased, namely, the pedal stroke parameter is kept unchanged in the braking Map stored in the brake ECU after the braking is finished, the braking torque is increased, the magnitude of each adjustment is the torque t, and the torque t can be calibrated;

the brake ECU stores a standard brake Map, and when the change rate of the brake pedal is larger than the set change rate during the current braking, the brake ECU is in an emergency braking condition at the moment and performs braking according to the standard brake Map calibrated by a manufacturer;

in the adjusted braking Map, when the stroke parameter of the brake pedal is kept unchanged, the torque which is finely increased or reduced is between the torque value + -nt in the standard Map, namely, the upper limit value and the lower limit value of the braking adjustment of the personalized braking Map are set.

2. An automatic adjustment method for the feel of a brake pedal of an automobile as claimed in claim 1, characterized by: after the vehicle is started, the personalized braking Map matched with the driver is obtained through identification for braking control, habit data of the driver is detected in the braking process, and the personalized braking Map is adjusted.

3. An automatic adjustment method for the feel of a brake pedal of an automobile as claimed in claim 2, characterized by: and when the personalized braking Map corresponding to the identity information is not acquired during the identity identification, taking the stored standard braking Map as the personalized braking Map corresponding to the identity information.

4. A method for automatically adjusting the feel of a brake pedal for an automobile according to any one of claims 1 to 3, characterized in that: the brake ECU outputs a brake torque according to a brake Map, which is a pedal stroke-brake torque relationship Map, and adjusts a relationship between the pedal stroke and the brake torque by adjusting an existing brake Map based on habit data.

5. The automatic adjustment method for the feel of a brake pedal of an automobile according to claim 4, characterized by: brake pedal travel data and deceleration signals are collected at each brake to characterize the driver's habits, and then the brake Map is adjusted based on the driver's habits.

6. The automatic adjustment method for the feel of the brake pedal of an automobile according to claim 5, characterized in that: the number of braking of the vehicle is detected during each vehicle trip, and the braking torque in the braking Map is adjusted based on the number of braking.

7. The automatic adjustment method for the feel of the brake pedal of an automobile according to claim 6, characterized in that: and in the one-time driving process, comparing the braking times with a braking times threshold value, and when the braking times threshold value is larger than the braking times threshold value, regulating the braking torque in the braking Map.

8. An automobile, characterized in that: the automobile comprises the automatic adjustment method for the brake pedal feel of the automobile according to any one of claims 1 to 7.