CN114274940B - Parking force testing method and system for vehicle carrying electronic parking system - Google Patents
Parking force testing method and system for vehicle carrying electronic parking system Download PDFInfo
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- CN114274940B CN114274940B CN202111665934.3A CN202111665934A CN114274940B CN 114274940 B CN114274940 B CN 114274940B CN 202111665934 A CN202111665934 A CN 202111665934A CN 114274940 B CN114274940 B CN 114274940B
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Abstract
The invention discloses a parking force testing method and system for a vehicle carrying an electronic parking system, comprising the steps of starting a brake testing rotary drum table, maintaining the rotation of a wheel rotary drum, monitoring the condition of the vehicle by an electronic brake control module, meeting a set condition, identifying the vehicle entering a parking force testing mode, controlling a central control display setting module to automatically open a parking force testing popup window and light a parking force testing button of the central control screen after receiving the information of the vehicle entering the parking force testing mode, continuously touching the button, sending a virtual parking force testing request by the central control display setting module, preventing the mechanical P-gear locking mechanism from executing mechanical locking by the whole vehicle control module after receiving the virtual parking force testing request, and controlling the clamping force of a caliper by the electronic brake control module according to gradient increasing logic until the maximum clamping force is reached. The invention can avoid the safety problems of damaging the mechanical P-gear locking mechanism and vehicle movement caused by misoperation of a driver when a parking force test is carried out.
Description
Technical Field
The invention belongs to the technical field of automobile braking systems, and particularly relates to a parking force testing method and system for a vehicle carrying an electronic parking system.
Background
At present, along with the development of vehicles in an intelligent direction, a host factory is more and more using a parking system which is only provided with a P-gear parking control mechanism and has no electronic hand brake switch component based on the more convenient demand of customer operation and the angle of reducing the cost of the whole parking system. Under the system framework, a driver can realize electronic parking clamping and mechanical P-gear locking mechanism locking only by pressing P by one key, and the driver can realize electronic parking release and mechanical P-gear release by operating to switch from P gear to other gears. According to the scheme, the P buttons are used for simultaneously controlling the electronic hand brake and the mechanical P-gear locking mechanism, so that the cost of the electronic hand brake switch is saved while the operation convenience is improved.
The regulation requires that each trolley is required to be subjected to parking force test when leaving the factory and annual inspection, and the parking force is required to be tested to be more than or equal to 20% of the load of the whole vehicle before being qualified. However, the safety problem exists when the scheme is used for testing the legal parking force, and because an electronic manual brake entity switch is omitted, a tester can only conduct the legal parking force test by pressing the P button for a long time, and the electronic caliper and the mechanical P-gear locking mechanism are controlled by the P button, so that the risk that the mechanical P-gear locking mechanism is locked and is reversely dragged and damaged by the test rotary drum is caused in the test process. There is currently no good solution to the safety risk that exists during the parking force test under such a system architecture.
The problems of the prior art are as follows:
in the parking force testing process, a rotary drum reverse trailer wheel (the front wheel is static, the wheel speed of the rear wheel maintains a certain value) lasts for a period of time, the system detects that the wheel speed condition is met, the system enters a parking force testing mode, the system detects that a driver always presses a P-gear button, the system enables an electronic caliper to implement clamping force according to steps, when the clamping force of the caliper reaches the maximum, the system judges that the caliper is in a clamping state, at the moment, a locking mechanism is controlled to lock, normally before the clamping force of the caliper reaches the maximum, the equipment judges that the parking force is qualified to stop the rotary drum, and after the rotary drum stops, the locking of the P-gear locking mechanism is carried out, so that the mechanical P-gear locking mechanism is prevented from being damaged. Disadvantages: a. if the clamping force of the calipers reaches the maximum, the braking force detected by the equipment is still insufficient (factors such as friction plate running-in and tire running-in are considered), the equipment can always drive the rotary drum to carry out continuous testing, at the moment, the mechanical P-gear locking mechanism can be locked, the rotary drum can continuously reversely drag the wheels, the P-gear locking clamping jaw can be damaged, and loss and safety risks are caused. b. The system does not have the man-machine interaction of entering the parking force test mode, if the driver operates the P button too fast, the electronic hand brake clamping is requested before the system enters the parking force test mode: if P is pressed for a short time, the mechanical P-gear locking mechanism and the calipers are clamped, the equipment detection clamping force is insufficient, the rotary drum continues to drag the rear wheel reversely, and the P-gear locking claw is damaged; if the P is pressed for a long time, the system can control the calipers to clamp directly with the maximum clamping force (the clamping force is directly clamped by the long-time pressing switch with the maximum clamping force), the step clamping force is not relaxed, short-time overshoot of the braking force is easily caused, the wheels are moved at the drum table, and the safety risk is caused.
Disclosure of Invention
The parking force testing method for the vehicle carrying the electronic parking system disclosed by the invention can be used for avoiding the safety problems of damaging the mechanical P-gear locking mechanism and vehicle movement caused by misoperation of a driver when the parking force is tested.
The parking force testing system for the vehicle with the electronic parking system disclosed by the invention can be used for avoiding the safety problems of damaging the mechanical P-gear locking mechanism and vehicle movement caused by misoperation of a driver when the parking force is tested.
According to the parking force testing method for the vehicle carrying the electronic parking system, the brake testing drum table is started, the rotation of the wheel drum is maintained, the electronic brake control module monitors the condition of the vehicle, the set condition is met, the vehicle is identified to enter the parking force testing mode, after the information that the vehicle enters the parking force testing mode is received, the central control display setting module is controlled to automatically open a parking force testing popup window and lighten a parking force testing button of the central control screen, the central control display setting module continuously touches the parking force testing popup window, the central control display setting module sends a virtual parking force testing request, after the virtual parking force testing request is received, the whole vehicle control module avoids the mechanical P-gear locking mechanism to execute mechanical locking, the electronic brake control module performs caliper clamping force control according to the gradient increasing logic until the maximum clamping force is reached, the parking force testing is completed, and the central control display setting module automatically closes the parking force testing popup window.
Further, the specific steps are as follows,
step one, a vehicle is horizontally and correctly placed on a brake test rotary drum table;
step two, starting the vehicle, and switching the gear to N gear;
step three, starting a brake test rotary drum table, wherein the two front wheel rotating drums keep static, and the rotating speeds of the two rear wheel rotating drums keep a certain speed to drive the rear wheel of the vehicle to rotate; the electronic brake control module monitors vehicle condition conditions of the vehicle, meets the set conditions, recognizes that the vehicle enters a parking force test mode, and sends information that the vehicle enters the parking force test mode;
step four, after receiving information of the vehicle entering a parking force test mode, the central control display setting module controls the central control screen to automatically pop up a parking force test popup window and lightens a parking force test button of the central control screen;
step five, when the parking force test button is continuously touched and pressed, the control display setting module 2 sends out a virtual parking force test request;
step six, the electronic brake control module controls the calipers to implement the clamping force of the calipers according to a certain gradient ladder; the whole vehicle control module avoids the response locking of a mechanical P-gear locking mechanism;
and step seven, the parking force test is completed, and the central control display setting module automatically closes the parking force test popup window.
In the third step, the vehicle condition is a vehicle power-on state, a vehicle gear, an accelerator, a brake, an electronic caliper state, front and rear wheel speeds, a steering wheel angle and a gradient condition of the vehicle.
Further, in the fourth step, after receiving the information that the vehicle enters the parking force test mode, the central control display setting module controls the central control screen to automatically pop up the parking force test popup window, and lights the parking force test button of the central control screen, wherein the gear is N gear, the wheel speed of the two rear wheels is less than 20 km/h.
In the sixth step, the electronic brake control module controls the calipers to increase the clamping force of the calipers by 4KN according to each 1S based on the calibrated flat clamping force of the calipers, and the clamping force of the calipers is implemented according to a certain gradient step until the maximum clamping force is reached, so that the test parking force can reach 20% of the load of the whole vehicle.
The invention also discloses a parking force testing system for the vehicle carrying the electronic parking system, which comprises an electronic brake control module, a whole vehicle control module, a central control display setting module, a mechanical P-gear locking mechanism, a left caliper and a right caliper;
the electronic brake control module is used for judging whether to enter a parking force mode or not and controlling the clamping force output of the left caliper and the right caliper;
the whole vehicle control module is used for driving and controlling a mechanical P-gear locking mechanism;
the electronic brake control module judges the condition of the vehicle entering the parking force test mode, the electronic brake control module recognizes the condition that the vehicle enters the parking force test mode, the central control display setting module controls the central control display screen to automatically open a parking force test popup window and lighten a parking force test button of the central control screen after receiving the information that the vehicle enters the parking force test mode, the central control display setting module sends a virtual parking force test request after clicking the button, the whole vehicle control module avoids a mechanical P-gear locking mechanism to execute mechanical locking after receiving the virtual parking force test request, and the electronic brake control module controls the clamping force of the left calipers and the right calipers to carry out the clamping force control of the calipers according to a gradient increasing logic until the maximum clamping force is reached; and the parking force test is completed, and the central control display setting module automatically closes the parking force test popup window.
Further, the device also comprises a gear shifter and a steering control module;
the electronic brake control module is also used for calculating the state of the electronic calipers, the state of the brake pedal, the wheel speed value and the gradient;
the whole vehicle control module is also used for controlling the power-on of the whole vehicle, collecting accelerator signals, judging the whole vehicle gear by collecting signals of a gear shifter and obtaining steering angle signals by a steering control module;
the vehicle condition is that the power-on of the whole vehicle is monitored, the gear of the whole vehicle of the gear shifter is N gear, an accelerator is not stepped on, the braking of the electronic braking control module is not stepped on, the left caliper and the right caliper are released left and right, the front wheel speed is static, the rear wheel speed is in a setting range, the steering wheel angle of the steering control module is in the setting range, and the gradient is in the setting range.
Further, the front wheel speed is static and the rear wheel speed is 4-8km/h, the steering wheel angle is within +/-25 DEG, and the gradient is within +/-5%.
The invention has the beneficial technical effects that:
1) In the parking force testing process, after the electronic brake control module enters the parking force testing mode, the driver is told through the central control screen popup window at the first time, and the driver can only conduct the parking force testing button operation after popup testing the popup window (the popup window is closed and the button is not operable when the parking force testing mode is not entered). The man-machine interaction is increased, the situation that a driver operates a P button too fast under the original scheme is effectively avoided, the electronic hand brake is required to be clamped before the system enters a parking force test mode (the original scheme is used for carrying out parking force test by pressing a P-gear key for a long time, the improved scheme is used for testing by pressing the P-gear key, and the improved scheme is used for directly operating the parking force test button of a test popup window), and the damage of a mechanical P-gear locking mechanism caused by the mechanical P-gear locking mechanism and the risk of vehicle movement in the test process are avoided. In addition, the popup window has a prompt function, so that the tester can effectively complete the test.
2) Through setting up solitary virtual parking power test button in well accuse function setting module, divide the request and the parking power test button of selector P button in different functional areas, effectually avoided only carried the parking system that P kept off parking operating mechanism and no electron manual brake switch components and parts and cause the problem of security risk at parking power test in-process machinery P keeps off locking mechanism malfunction. Meanwhile, virtual buttons are added on the large screen, so that the cost of the whole vehicle is effectively reduced.
Drawings
FIG. 1 is a flowchart of a specific test method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system configuration according to an embodiment of the present invention;
FIG. 3 is a control logic diagram of the electronic brake control module of the present invention;
fig. 4 is a control logic diagram of the central control display setting module in this aspect.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention discloses a parking force testing method for a vehicle carrying an electronic parking system, which comprises the following specific steps,
step one, a vehicle is horizontally and correctly placed on a brake test rotary drum table;
step two, starting the vehicle, and switching the gear to N gear;
step three, starting a brake test drum table, wherein the two front wheel rotating drums keep static, and the rotating speeds of the two rear wheel rotating drums keep 4-8KM/h (the rotating speeds of the two rear wheels keep consistent) to drive the rear wheels of the vehicle to rotate; the electronic brake control module monitors vehicle condition conditions of the vehicle, meets set conditions, recognizes that the vehicle enters a parking force test mode, and sends information that the vehicle enters the parking force test mode. The vehicle condition is the vehicle power-on state, the whole vehicle gear, the accelerator, the brake, the electronic caliper state, the front and rear wheel speeds, the steering wheel angle and the gradient condition of the vehicle. The information that the vehicle enters the parking force test mode is a parking force test identification bit signal, and the value of the parking force test identification bit signal is set as 'having a request'.
Step four, after receiving the information that the vehicle enters a parking force test mode, the central control display setting module 2 controls the central control screen to automatically pop up a parking force test popup window, and lights a parking force test button of the central control screen, wherein the gear is N gear, and the wheel speed of two rear wheels is less than 20 km/h; the driver just can carry out parking force test button operation (not get into parking force test mode, then the bullet window closes and parking force test button put grey inoperable) after popping out parking force test bullet window, has increased this man-machine interaction, can prevent the mistake effectively, has ensured to just carry out the parking force test after getting into parking force test mode.
Step five, when the parking force test button is continuously clicked, the control display setting module 2 sends out a virtual parking force test request; the parking force test virtual request is a "parking force test virtual button signal", and its value is set to "requested".
Step six, the electronic brake control module 1 controls the calipers to implement the clamping force of the calipers according to a certain gradient ladder; the whole vehicle control module 3 avoids the response locking of a mechanical P-gear locking mechanism; the whole vehicle control module 3 cannot respond to the request, and the problem of incorrect locking of the mechanical P-gear locking mechanism in the parking force testing process is thoroughly avoided.
In the sixth step, the electronic brake control module 1 controls the calipers to increase the clamping force of the calipers by 4KN according to each 1S based on the calibrated flat clamping force of the calipers, and the clamping force of the calipers is implemented according to a certain gradient step until the maximum clamping force is reached, so that the test parking force can reach 20% of the load of the whole vehicle.
And step seven, the parking force test is completed, and the central control display setting module 2 automatically closes the parking force test popup window.
The invention also discloses a parking force testing system for the vehicle carrying the electronic parking system, and in order to meet the requirements, a system framework is designed firstly, and a system structure diagram of the system is shown in the figure 2. The system framework comprises an electronic brake control module 1, a whole vehicle control module 3, a central control display setting module 2, a gear shifter 4, a P-gear locking mechanism 7, a steering control module 8, a left caliper 5 and a right caliper 6.
The electronic brake control module 1 acquires an electronic caliper state, a brake pedal state, a wheel speed value and a calculated gradient; the electronic brake control module 1 judges whether to enter a parking force mode or not, and can control the clamping force output of the left caliper 5 and the right caliper 6.
The whole vehicle control module 3 controls the whole vehicle to be electrified, collects an accelerator signal, judges the whole vehicle gear, collects and judges the P gear entity switch state, and can control the P gear locking motor.
The central control display setting module 2 provides a parking force test popup window and provides a virtual parking force test button.
The steering control module 8 provides a steering angle signal.
The electronic brake control module 1 is responsible for entering and exiting a parking force test mode, controlling clamping force of calipers in the parking force mode, responding to a parking request of the whole vehicle control module and responding to a parking force test request sent by the central control display setting module 2, and the control logic structure is shown in fig. 3. Regarding parking force test mode switching: when the electronic brake control module 1 monitors that the whole vehicle is electrified, the gear of the whole vehicle is N gear, the accelerator is not stepped on, the brake is not stepped on, the left and right states of the electronic caliper are released, the front wheel speed is static, the rear wheel speed is 4-8km/h, the steering wheel angle is within +/-25 degrees, and the gradient is met, the electronic brake control module 1 enters a parking force test mode; when any of the above conditions is not satisfied, the normal mode is entered. In the parking force test mode, the electronic brake control module 1 sends out parking force test mode information, which is defined as a parking force test identification position signal, the value of the parking force test identification position signal is set to be 'with request', and when the parking force test virtual request sent out by the central control display setting module 2 is continuously received, the request is defined as a parking force test virtual button signal, the value of the parking force test virtual button signal is set to be 'with request', the clamping force of the caliper needs to be controlled to be increased by 4KN per 1S on the basis of the flat clamping force until the maximum clamping force is reached, and the test parking force can reach 20% of the whole vehicle load; when in the normal mode, the electronic brake control module 1 controls the clamping force of the calipers according to the calibrated clamping forces with different gradients, and does not control the progressive increasing clamping force of the calipers.
The central control display setting module 2 is mainly responsible for sending out parking force test popup windows and parking force test buttons of a central control screen, and the control logic of the central control display setting module is shown in fig. 4. Regarding parking force test mode switching: the central control display setting module 2 receives a parking force test identification position signal sent by the electronic brake control module 1 as 'having a request', the whole vehicle gear is N gear (redundancy judgment is added with safety), the wheel speed of two rear wheels is less than 20km/h (redundancy judgment is added with safety), the controller enters a parking force test button activation state, any of the above conditions is not met, and the controller enters a parking force test button deactivation state. Regarding the functional features in two modes: in the activated state of the parking force test button, the central control display setting module 2 automatically opens a parking force test popup window, and lights the parking force test button of the central control screen, and when a driver continuously clicks the button, the central control display setting module 2 sends a parking force test virtual button signal to be 'having a request'; in the parking force test button inactive state, the central control display screen closes the parking force test popup window and sets the gray parking force test button (the driver cannot operate the button), and the central control display setting module 2 sends a parking force test virtual button signal to be "no request".
The whole vehicle control module 3 is mainly responsible for collecting a P gear request sent by the gear shifter 4, controlling a mechanical P gear locking mechanism, controlling gears and the like. When parking, the method comprises the following steps: the P button on the shifter 4 is operated, the whole vehicle control module 3 sends a parking request (the request is used for requesting the electronic brake control module to control clamping of the calipers), and when the clamping of the calipers is detected, the P-gear locking mechanism is controlled to lock (if the state change of the calipers is not detected for a certain time, the mechanical P-gear locking mechanism is also forced to lock). When leaving: and (3) performing P gear-out operation (switching from P to other gears), wherein the whole vehicle control module firstly controls the mechanical locking mechanism to be released, and then sends a request for releasing the electronic calipers to the electronic brake control module 1, so that the electronic hand brake is released. In addition, when the vehicle control module 3 receives the parking force test virtual button signal of the central control setting module as a request, the vehicle control module will not respond.
Claims (9)
1. The parking force testing method for the vehicle carrying the electronic parking system is characterized by comprising the following steps of:
step one, a brake test drum table is started, rotation of a wheel drum is maintained, an electronic brake control module (1) monitors vehicle condition conditions of a vehicle, set conditions are met, the vehicle is identified to enter a parking force test mode, and information of the vehicle entering the parking force test mode is sent;
step two, after receiving information of the vehicle entering a parking force test mode, the central control display setting module (2) controls the central control display screen to automatically open a parking force test popup window and lightens a parking force test button of the central control screen;
step three, continuously touching a parking force test button, and sending a virtual parking force test request by a central control display setting module (2);
step four, after receiving a virtual parking force test request, the whole vehicle control module (3) avoids the mechanical P-gear locking mechanism to execute mechanical locking, and the electronic brake control module (1) controls the clamping force of the calipers according to the gradient increasing logic until the maximum clamping force is reached;
and step five, the parking force test is completed, and the central control display setting module (2) automatically closes the parking force test popup window.
2. The parking force testing method for a vehicle equipped with an electronic parking system according to claim 1, wherein: before the first step, the method further comprises: placing the vehicle horizontally and correctly on a brake test drum table; the vehicle is started and the gear is shifted to N.
3. The method according to claim 1, wherein in the first step, the rotation of the wheel drums is maintained by keeping the front wheel drums stationary and the rear wheel drums rotating at a constant speed to drive the rear wheels of the vehicle.
4. The parking force testing method for a vehicle equipped with an electronic parking system according to claim 1, wherein:
in the first step, the vehicle condition is the vehicle power-on state, the whole vehicle gear, the accelerator, the brake, the electronic caliper state, the front and rear wheel speeds, the steering wheel angle and the gradient condition of the vehicle.
5. The parking force testing method for a vehicle equipped with an electronic parking system according to claim 1, wherein:
and step two, after receiving the information that the vehicle enters the parking force test mode, the central control display setting module (2) controls the central control screen to automatically pop up a parking force test popup window, and lightens a parking force test button of the central control screen, wherein the gear is N gear, and the wheel speed of the two rear wheels is less than 20 km/h.
6. The parking force testing method for a vehicle equipped with an electronic parking system according to claim 1, wherein:
and step four, the electronic brake control module (1) controls the calipers to increase 4KN according to each 1S based on the flat ground clamping force calibrated by the calipers, and implements the clamping force of the calipers according to a certain gradient step until the maximum clamping force is reached, so that the test parking force can reach 20% of the load of the whole vehicle.
7. Carry on parking power test system of electron parking system vehicle, its characterized in that: the device comprises an electronic brake control module (1), a whole vehicle control module (3), a central control display setting module (2), a mechanical P-gear locking mechanism (7), a left caliper (5) and a right caliper (6);
the electronic brake control module (1) is used for judging whether to enter a parking force mode and controlling the clamping force output of the left caliper (5) and the right caliper (6);
the whole vehicle control module (3) is used for driving and controlling a mechanical P-gear locking mechanism;
the electronic brake control module (1) judges the condition of a vehicle entering a parking force test mode, the electronic brake control module (1) sends out a signal of the vehicle entering the parking force test mode, the central control display setting module (2) controls the central control display screen to automatically open a parking force test popup window and lighten a parking force test button of the central control screen after receiving the information of the vehicle entering the parking force test mode, the central control display setting module (2) continuously touches the parking force test button to send out a parking force test virtual request, the whole vehicle control module (3) avoids a mechanical P gear locking mechanism to execute mechanical locking after receiving the parking force test virtual request, and the electronic brake control module (1) controls the clamping force of the left calipers (5) and the right calipers (6) according to gradient increasing logic until the clamping force of the calipers reaches the maximum clamping force; and the parking force test is completed, and the central control display setting module (2) automatically closes the parking force test popup window.
8. The parking force test system of a vehicle equipped with an electronic parking system as set forth in claim 7, wherein: the steering control device also comprises a gear shifter (4) and a steering control module (8);
the electronic brake control module (1) is also used for calculating the state of an electronic caliper, the state of a brake pedal, the value of the wheel speed and the gradient;
the whole vehicle control module (3) is also used for controlling the power on of the whole vehicle, acquiring an accelerator signal, judging the whole vehicle gear by acquiring a signal of the gear shifter (4) and acquiring a steering angle signal by the steering control module (8);
the vehicle condition is that the power on of the whole vehicle is monitored, the gear of the whole vehicle of the gear shifter (4) is N gear, an accelerator is not stepped on, the braking of the electronic braking control module (1) is not stepped on, the left calipers (5) and the right calipers (6) are released left and right, the front wheel speed is static, the rear wheel speed is in a setting range, the steering wheel angle of the steering control module is in the setting range, and the gradient is in the setting range.
9. The parking force test system of a vehicle equipped with an electronic parking system as set forth in claim 8, wherein: the front wheel speed is static, the rear wheel speed is 4-8km/h, the steering wheel angle is within +/-25 degrees, and the gradient is within +/-5 percent.
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| DE102020208950A1 (en) * | 2019-07-23 | 2021-01-28 | Mando Corporation | VEHICLE CONTROL DEVICE AND METHOD OF VEHICLE CONTROL |
| CN113682279A (en) * | 2021-09-18 | 2021-11-23 | 江西五十铃汽车有限公司 | Intelligent grading method for electronic parking braking force |
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| CN101819094A (en) * | 2010-03-22 | 2010-09-01 | 芜湖伯特利汽车安全系统有限公司 | Comprehensive test bench for electronic parking brake system |
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| DE102020208950A1 (en) * | 2019-07-23 | 2021-01-28 | Mando Corporation | VEHICLE CONTROL DEVICE AND METHOD OF VEHICLE CONTROL |
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