An EPB automatic release method and device for identifying driver's intention in advance

Abstract

The present invention discloses an EPB automatic release method and device for identifying the driver's intention in advance, which belongs to the field of automatic driving technology. The method includes: a controller collects relevant signals, and determines whether the automatic release conditions are met according to the collected relevant signals to determine whether the driver has the intention to start and leave; if the automatic release conditions are met, the EPB is automatically released, and at the same time, it is determined whether to park according to whether the EPB parking conditions are met to determine whether to keep the EPB released state or park. The present invention provides a way to identify the automatic release of EPB, and the release timing of EPB can be accurately identified. When the driver wants to start and leave, the EPB can be released in advance, which can ensure a faster starting speed and avoid dragging to bring a bad experience to the driver. When starting on a slope, the automatic release timing is accurately identified, and the slope slip phenomenon will not be caused by the early release of EPB.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic driving, and more specifically, relates to an EPB automatic release method and device for identifying a driver's intention in advance. Background Art

[0002] With the rapid development of electric vehicles, based on the characteristics of electric vehicles, when the vehicle starts, the motor torque rises quickly. However, due to the structure of the electronic caliper and the parking slope, the caliper release time takes about 1 second, and even longer on a large slope. In order to ensure a faster starting speed and prevent dragging, the timing of automatic parking release needs to be advanced and accurately identify the driver's intention to leave. At present, many electric vehicles have cancelled the EPB switch, so it is particularly important to accurately identify the timing of automatic release.

[0003] The existing EPB automatic release strategy generally starts to release EPB only when the actual gear is in D or R gear, the accelerator pedal is pressed, and the driving force is sufficient. The caliper release time generally takes about 1 second, and even longer on a slope. However, on electric vehicles, due to the rapid increase in driving torque, it is easy for the driving torque to reach a high level before the caliper completes the release action, resulting in the vehicle's starting lag phenomenon, which brings a bad driving experience to the driver. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention proposes an EPB automatic release method and device for early identification of the driver's intention. By early identifying the EPB release strategy of the driver's intention and identifying the driver's intention to leave, a faster starting speed can be ensured and the bad experience caused by dragging can be avoided.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an EPB automatic release method for identifying the driver's intention in advance, comprising:

[0006] The controller collects relevant signals and determines whether the automatic release conditions are met based on the collected relevant signals to determine whether the driver intends to start and leave;

[0007] If the automatic release condition is met, the EPB is automatically released. At the same time, whether to park the vehicle is determined based on whether the EPB parking condition is met to determine whether to maintain the EPB release state or to park the vehicle.

[0008] In some optional embodiments, the automatic release conditions include:

[0009] Condition 1: When the actual gear is in P gear and the brake pedal is pressed, the DMS detects that the driver's hand is on the shift lever and determines that the driver needs to shift gears to release the parking brake, and automatically releases the EPB in advance;

[0010] Alternatively, condition two: use the target gear position instead of the actual gear position as the judgment condition, and when the target gear position is switched from P gear to D gear or R gear, the EPB starts to be automatically released.

[0011] In some optional implementation schemes, when the actual gear position is P and the brake pedal is depressed, the DMS detects that the driver's hand is on the shift lever, and determines that the driver needs to shift gears to release the parking brake, and automatically releases the EPB in advance, including:

[0012] When the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold, the DMS detects that the driver's hand is on the shift lever;

[0013] Or, when the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position and the DMS detects that the driver's hand is on the shift lever, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold;

[0014] The time when the condition is met is T1, and it is judged that the driver intends to shift out of P gear and has the intention to leave, and the EPB is automatically released.

[0015] In some optional implementation schemes, when the condition is met at time T1, it is determined that the driver intends to shift out of the P gear and has the intention to drive away, and after the EPB is automatically released, the method further includes:

[0016] If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear, the EPB will automatically park the vehicle;

[0017] If the actual gear is still in P gear within the preset time t, EPB will automatically park;

[0018] If it is detected that the EPB switch is pulled up or powered down to the OFF position or shifted to the P position again, the EPB will automatically park the vehicle.

[0019] In some optional implementation schemes, the use of the target gear position instead of the actual gear position as the judgment condition, when the target gear position is switched from the P gear to the D gear or the R gear, the EPB is automatically released, including:

[0020] When the ignition switch is in ON or START, the door is closed, the driver's seat belt is fastened, the actual gear is P, the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold and the target gear is D or R, the condition is met at T2, and it is judged that the driver intends to leave, and the EPB is automatically released.

[0021] In some optional implementation schemes, when the condition is met at time T2, it is determined that the driver has an intention to leave, and after the EPB is automatically released, the method further includes:

[0022] If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear, the EPB will automatically park the vehicle;

[0023] If the actual gear is still in P gear within the preset time t, EPB will automatically park;

[0024] If it is detected that the EPB switch is pulled up or powered down to the OFF position or shifted to the P position again, the EPB will automatically park the vehicle.

[0025] In some optional implementations, if the automatic release conditions are met, the EPB is automatically released, including:

[0026] When T1≥T2, the EPB is automatically released at time T2 according to the judgment strategy of condition 2; when T1<T2, the EPB is automatically released at time T1 according to the judgment strategy of condition 1.

[0027] According to another aspect of the present invention, there is provided an EPB automatic release device for recognizing the driver's intention in advance, comprising:

[0028] A condition judgment module is used to collect relevant signals and judge whether the automatic release conditions are met based on the collected relevant signals to determine whether the driver intends to start and leave;

[0029] The operation module is used to automatically release the EPB when the automatic release condition is met, and at the same time, judge whether to park the vehicle according to whether the EPB parking condition is met, so as to determine whether to keep the EPB released state or park the vehicle.

[0030] According to another aspect of the present invention, there is provided a controller including the above-mentioned EPB automatic release device for identifying the driver's intention in advance.

[0031] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the above methods are implemented.

[0032] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0033] A strategy for releasing the EPB that can identify the driver's intention in advance, and a method for identifying the driver's intention to leave are proposed. A way to identify the automatic release of EPB is provided, and the timing of EPB release can be accurately identified. When the driver wants to start and leave, the EPB can be released in advance, which can ensure a faster starting speed and avoid dragging to bring a bad experience to the driver. Since electric vehicles are basically equipped with a hill start function, when starting on a slope, the timing of automatic release can be accurately identified, and the slope will not slide due to the early release of EPB. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of an EPB automatic release method for identifying a driver's intention in advance provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] In the examples of the present invention, "first", "second" (if any), etc. are used to distinguish different objects rather than to describe a specific order or sequence.

[0037] The technical terms used in the present invention and embodiments are explained as follows:

[0038] EPB:Electrical Park Brake electronic parking brake system

[0039] DMS:Driver Monitoring System

[0040] ESP:Electronic Stability Program

[0041] IBC: Integrated Brake Control

[0042] like Figure 1 FIG. 1 is a flow chart of an EPB automatic release method for identifying the driver's intention in advance provided by an embodiment of the present invention. Figure 1 The method shown includes the following steps:

[0043] The IBC or ESP or EPB controller collects relevant signals and determines whether the automatic release conditions are met based on the collected relevant signals to determine whether the driver intends to start and leave;

[0044] If the automatic release condition is met, the EPB is automatically released. At the same time, whether to park the vehicle is determined based on whether the EPB parking condition is met to determine whether to maintain the EPB release state or to park the vehicle.

[0045] In the embodiment of the present invention, the collected related signals include: brake master cylinder oil pressure signal, brake pedal switch signal, gear position signal, slope signal, door signal, driver's seat belt signal, vehicle speed signal, etc.

[0046] In the embodiment of the present invention, the automatic release conditions include two types:

[0047] Condition 1: When the actual gear is in P gear and the brake pedal is pressed, the DMS detects that the driver's hand is on the shift lever and determines that the driver needs to shift gears to release the parking brake, and automatically releases the EPB in advance;

[0048] Condition 2: Use the target gear instead of the actual gear as the judgment condition. When the target gear is switched from P to D or R, EPB will be automatically released.

[0049] In the embodiment of the present invention, the judgment strategy of condition one is:

[0050] When the ignition switch is in the ON or START position;

[0051] The driver is in the vehicle, i.e. the doors are closed and the driver's seat belt is fastened;

[0052] And the actual gear position is P gear;

[0053] And after the brake pedal is depressed, that is, the master cylinder oil pressure is greater than the preset oil pressure threshold, the DMS detects that the driver's hand is placed on the shift lever from another position; or, after the DMS detects that the driver's hand is on the shift lever, the brake pedal changes from not depressed to depressed, that is, the master cylinder oil pressure is greater than the preset oil pressure threshold;

[0054] When the above conditions are met at the same time, the time when the conditions are met is T1, and it is judged that the driver intends to shift out of P gear and has the intention to drive away, and the EPB can be automatically released at this time;

[0055] If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear, the EPB will automatically park the vehicle;

[0056] If the actual gear is still in P gear within the preset time t (t can be calibrated), EPB will automatically park;

[0057] If the driver intends to park, such as pulling up the EPB switch or turning the power off to OFF or shifting the car to P again, EPB will automatically park the car.

[0058] In the embodiment of the present invention, the judgment strategy of condition 2 is:

[0059] When the ignition switch is in the ON or START position;

[0060] The driver is in the vehicle, i.e. the doors are closed and the driver's seat belt is fastened;

[0061] And the actual gear position is P gear;

[0062] And the brake pedal is pressed, that is, the master cylinder oil pressure is greater than the preset oil pressure threshold;

[0063] And the target gear is D gear or R gear;

[0064] When the above conditions are met at the same time, the time when the conditions are met is T2, and it is judged that the driver has the intention to leave, and the EPB can be released at this time;

[0065] If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear (it takes a certain amount of judgment and execution time from the target gear being P to the actual gear being P), EPB will automatically park the vehicle;

[0066] If the actual gear is still in P gear (due to gear switching conditions not being met, etc.) within the preset time t (t can be calibrated), the EPB will automatically park;

[0067] If the driver intends to park, such as pulling up the EPB switch or turning the power off to OFF or shifting the car to P again, EPB will automatically park the car.

[0068] In an embodiment of the present invention, after collecting relevant signals, two conditions can be used to simultaneously determine the timing of EPB release. When T1≥T2, the judgment strategy of condition two is used to automatically release EPB at time T2; when T1<T2, the judgment strategy of condition one is used to automatically release EPB at time T1.

[0069] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0070] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An EPB automatic release method for identifying the driver's intention in advance, characterized in that: include: The controller collects relevant signals and determines whether the automatic release conditions are met based on the collected relevant signals to determine whether the driver intends to start and leave; If the automatic release condition is met, the EPB is automatically released, and at the same time, whether to park is determined based on whether the EPB parking condition is met, so as to determine whether to keep the EPB released state or park; The automatic release conditions include: Condition 1: When the actual gear is in P gear and the brake pedal is pressed, the DMS detects that the driver's hand is on the shift lever and determines that the driver needs to shift gears to release the parking brake, and automatically releases the EPB in advance; When the actual gear is in P gear and the brake pedal is depressed, the DMS detects that the driver's hand is on the gear lever, determines that the driver needs to shift gears and release the parking brake, and automatically releases the EPB in advance, including: When the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold, the DMS detects that the driver's hand is on the shift lever; Or, when the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position and the DMS detects that the driver's hand is on the shift lever, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold; The time when the condition is met is T1, and it is judged that the driver intends to shift out of P gear and has the intention to leave, and the EPB is automatically released.

2. The method according to claim 1, characterized in that: When the condition is met at time T1, it is determined that the driver intends to shift out of the P gear and has the intention to drive away, and the EPB is automatically released, the method further includes: If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear, the EPB will automatically park the vehicle; If the actual gear is still in P gear within the preset time t, EPB will automatically park; If it is detected that the EPB switch is pulled up or powered down to the OFF position or shifted to the P position again, the EPB will automatically park the vehicle.

3. The method according to claim 1, characterized in that The automatic release conditions also include: Condition 2: Use the target gear instead of the actual gear as the judgment condition. When the target gear is switched from P to D or R, EPB starts to be released automatically.

4. The method according to claim 3, characterized in that: The method of using the target gear position instead of the actual gear position as the judgment condition and automatically releasing the EPB when the target gear position is switched from the P gear to the D gear or the R gear includes: When the ignition switch is in ON or START, the door is closed, the driver's seat belt is fastened, the actual gear is P, the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold and the target gear is D or R, the condition is met at T2, and it is judged that the driver intends to leave, and the EPB is automatically released.

5. The method according to claim 4, characterized in that When the condition is met at time T2, it is determined that the driver intends to leave, and the EPB is automatically released, the method further includes: If the vehicle is detected to be sliding down a slope before the actual gear is switched out of P gear, the EPB will automatically park the vehicle; If the actual gear is still in P gear within the preset time t, EPB will automatically park; If it is detected that the EPB switch is pulled up or powered down to the OFF position or shifted to the P position again, the EPB will automatically park the vehicle.

6. The method according to claim 5, characterized in that If the automatic release conditions are met, the EPB is automatically released, including: When T1≥T2, the EPB is automatically released at time T2 according to the judgment strategy of condition 2; when T1<T2, the EPB is automatically released at time T1 according to the judgment strategy of condition 1.

7. An EPB automatic release device that recognizes the driver's intention in advance, characterized in that: include: The condition judgment module is used to collect relevant signals and judge whether the automatic release condition is met according to the collected relevant signals to determine whether the driver has the intention to start and leave. The automatic release condition includes: Condition 1: When the actual gear is in P gear and the brake pedal is pressed, when the DMS detects that the driver's hand is on the shift lever, it is judged that the driver needs to shift gears to release the parking, and the EPB is automatically released in advance; When the actual gear is in P gear and the brake pedal is depressed, the DMS detects that the driver's hand is on the gear lever, determines that the driver needs to shift gears and release the parking brake, and automatically releases the EPB in advance, including: When the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold, the DMS detects that the driver's hand is on the shift lever; Or, when the ignition switch is in the ON or START position, the door is closed, the driver's seat belt is fastened, the actual gear is in the P position and the DMS detects that the driver's hand is on the shift lever, and the brake master cylinder oil pressure signal is greater than the preset oil pressure threshold; The time when the condition is met is T1, and it is judged that the driver intends to shift out of P gear and has the intention to drive away, and the EPB is automatically released; The operation module is used to automatically release the EPB when the automatic release condition is met, and at the same time, judge whether to park the vehicle according to whether the EPB parking condition is met, so as to determine whether to keep the EPB released state or park the vehicle.

8. A controller comprising the EPB automatic release device for identifying the driver's intention in advance as claimed in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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