CN-121977858-A - Intelligent calibration device and calibration method for opening degree of brake pedal

CN121977858ACN 121977858 ACN121977858 ACN 121977858ACN-121977858-A

Abstract

The invention discloses an intelligent calibration device and a calibration method for the opening degree of a brake pedal, the device comprises a mechanical base, a calibration action pedal, a servo drive limiting mechanism, an emergency brake pedal, a separable linkage mechanism and a controller. The calibration action pedal is connected with the emergency brake pedal through a separable linkage mechanism, and the controller drives the output end of the servo drive limiting mechanism to move to a corresponding limiting position according to the received target opening instruction, so that accurate mechanical limiting is provided for rotation of the calibration action pedal. The invention realizes high-precision and repeatable pedal opening calibration through servo drive, integrates an emergency braking function, solves the problem of insufficient precision and safety in the calibration process of the new energy automobile braking energy recovery system, and can be used for research, development and test of a vehicle braking system.

Inventors

TIAN WEIJIAN
CHEN RENQING
REN YUJUN
GAI WEI

Assignees

潍柴新能源商用车有限公司

Dates

Publication Date: 20260505
Application Date: 20260313

Claims (10)

1. An intelligent calibration device for opening of a brake pedal is characterized by comprising: the mechanical base is fixedly arranged on the floor of the cab of the vehicle; a calibration action pedal, the connecting end of which is rotatably connected to the mechanical base through a first hinge, and the acting end of which is used for abutting against a vehicle brake pedal; the servo drive limiting mechanism is arranged on the mechanical base, the position of the output end of the servo drive limiting mechanism can be controlled and linearly adjusted, and mechanical limiting which can be accurately set is provided for the rotation of the calibration action pedal; An emergency brake pedal, the connecting end of which is rotatably connected to the mechanical base through a second hinge, and the acting end of which is used for abutting against the brake pedal of the vehicle; The separable linkage mechanism is arranged between the calibration action pedal and the emergency brake pedal, and is used for enabling the calibration action pedal and the emergency brake pedal to be linked in a calibration mode and allowing the emergency brake pedal to independently act in an emergency brake mode; And the controller is electrically connected with the servo driving limiting mechanism and is used for receiving a target opening instruction and controlling the output end of the servo driving limiting mechanism to move to a limiting position corresponding to the target opening.
2. The brake pedal opening intelligent calibration device according to claim 1, wherein the servo drive limiting mechanism comprises a servo motor, a screw rod driven by the servo motor, and a slider matched with the screw rod, and the slider is used as the output end.
3. The brake pedal opening intelligent calibration device according to claim 1, further comprising a displacement sensor for detecting an actual opening of the calibration action pedal or the vehicle brake pedal, the displacement sensor being electrically connected to the controller, the controller being configured to perform closed-loop control of the servo drive limiting mechanism according to the target opening command and the actual opening.
4. The intelligent calibration device for opening of a brake pedal according to claim 3, wherein the displacement sensor is an angle sensor, and an input shaft of the displacement sensor is connected with a rotating shaft of the first hinge or the second hinge.
5. The brake pedal opening intelligent calibration device according to claim 1, wherein the separable linkage mechanism comprises: the first groove is arranged on the side surface of the calibration action pedal; the second groove is arranged on the side face of the emergency brake pedal and matched with the first groove; the electromagnetic locking piece locks the emergency brake pedal when the power is on, so that the first groove and the second groove are kept buckled to realize linkage, and releases when the power is off or an emergency signal is received, so that the emergency brake pedal is allowed to independently act.
6. The brake pedal opening intelligent calibration device according to claim 1, further comprising a man-machine interaction unit in communication with the controller for inputting the target opening command, selecting a test mode, and displaying device status information.
7. The brake pedal opening intelligent calibration device according to claim 6, further comprising a vehicle communication interface for interfacing with a vehicle bus to obtain a vehicle state parameter, wherein the controller is further configured to dynamically adjust the target opening command based on the vehicle state parameter.
8. The brake pedal opening intelligent calibration device according to claim 7, wherein the vehicle state parameters include vehicle speed and battery state of charge.
9. An intelligent calibration method for the opening degree of a brake pedal, which is characterized by using the intelligent calibration device for the opening degree of the brake pedal according to any one of claims 1to 8, and comprising the following steps: S1, installing the intelligent calibration device for the opening degree of the brake pedal on a vehicle, enabling the action ends of the calibration action pedal and the emergency brake pedal to abut against the brake pedal of the vehicle, and enabling the calibration action pedal and the emergency brake pedal to be linked through a detachable linkage mechanism; s2, setting a target brake pedal opening degree through a controller; S3, the controller drives the output end of the servo drive limiting mechanism to move to a limiting position corresponding to the target opening; s4, pressing a calibration action pedal until the calibration action pedal is limited by the output end of the servo drive limiting mechanism, and enabling a vehicle brake pedal to reach the target opening; S5, performing a calibration test of a vehicle braking system under the target opening degree; And S6, in the test process, if emergency braking is needed, the emergency braking pedal is pressed hard, the separable linkage mechanism is separated, and the emergency braking pedal independently presses the vehicle braking pedal.
10. The method according to claim 9, wherein in step S2, the controller obtains real-time vehicle state parameters through a vehicle communication interface, and automatically generates the target brake pedal opening matched with the current vehicle state parameters based on a pre-stored calibration mapping relationship.

Description

Intelligent calibration device and calibration method for opening degree of brake pedal Technical Field The invention relates to the field of vehicle tests, in particular to an intelligent calibration device and a calibration method for opening degree of a brake pedal. Background New energy automobiles (such as pure electric automobiles and hybrid electric automobiles) become an important development direction of the automobile industry due to low carbon emission and high energy efficiency. The braking energy recovery system is one of key technologies for improving the energy utilization efficiency of the new energy automobile. The system can remarkably prolong the endurance mileage by converting the kinetic energy of the vehicle during braking into electric energy and storing the electric energy into a battery. The braking energy recovery system also brings the coupling problem of motor braking and the traditional braking system, and especially, the dynamic instability phenomena such as braking tail flick and the like can be caused when the motor braking is braked on a road surface (low-adhesion road surface) with a lower adhesion coefficient. The braking energy recovery principle is that kinetic energy generated when a vehicle decelerates is converted into electric energy and stored in a power battery, a driver transmits a braking signal to a motor controller by stepping on a brake pedal, the motor controller sends a negative torque control signal to a driving motor to enable the driving motor to decelerate, meanwhile, the driving motor can generate induced current to conduct energy recovery, and the intensity of energy recovery is related to the opening degree of stepping on the brake pedal. In order to improve energy recovery, only a motor is generally used for braking in the initial stage of braking, traditional mechanical braking cannot be involved, but braking force distribution of a driving motor is difficult to be balanced, particularly, when a road surface with a low attachment coefficient is braked, the front braking stage is not involved due to an ABS system and the like, and the dangerous situation of vehicle tail flicking easily occurs when the vehicle is braked purely by the motor, so that unbalance exists between the effect of improving energy recovery and the requirement of maintaining stable braking posture. It can be seen that certain drawbacks remain with the prior art. Disclosure of Invention The invention aims to provide an intelligent calibration device and a calibration method for the opening degree of a brake pedal, which are used for improving and guaranteeing the energy recovery effect and the stability of the braking posture by calibrating the relation between the opening degree of the brake pedal and the braking torque of a motor. In order to achieve the above purpose, the present invention adopts the following technical scheme: in a first aspect, the present application provides an intelligent calibration device for a brake pedal opening, including: the mechanical base is fixedly arranged on the floor of the cab of the vehicle; a calibration action pedal, the connecting end of which is rotatably connected to the mechanical base through a first hinge, and the acting end of which is used for abutting against a vehicle brake pedal; the servo drive limiting mechanism is arranged on the mechanical base, the position of the output end of the servo drive limiting mechanism can be controlled and linearly adjusted, and mechanical limiting which can be accurately set is provided for the rotation of the calibration action pedal; An emergency brake pedal, the connecting end of which is rotatably connected to the mechanical base through a second hinge, and the acting end of which is used for abutting against the brake pedal of the vehicle; The separable linkage mechanism is arranged between the calibration action pedal and the emergency brake pedal, and is used for enabling the calibration action pedal and the emergency brake pedal to be linked in a calibration mode and allowing the emergency brake pedal to independently act in an emergency brake mode; And the controller is electrically connected with the servo driving limiting mechanism and is used for receiving a target opening instruction and controlling the output end of the servo driving limiting mechanism to move to a limiting position corresponding to the target opening. In the scheme, the servo drive limiting mechanism provides mechanical hard limiting which can be accurately set, replaces the traditional rough mode of relying on foot feeling of a tester or a simple angle ruler, ensures the consistency of the end position of each stepping action, and realizes high-precision and repeatable calibration. Secondly, a parallel structure is adopted between the calibration action pedal and the emergency brake pedal, and mode switching is carried out through the separable linkage mechanism, so that full-force braking can be realized instant