Vehicle starting method and device

Abstract

This application relates to a vehicle starting method and device, belonging to the technical field of vehicles. The method includes: after the vehicle starts, periodically obtaining the pressure value of the brake master cylinder of the vehicle; if within a first preset duration after detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when it is detected that the pressure value is equal to the target pressure value and the vehicle speed is zero, controlling the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch. By using this application, the duration of the coexistence of the braking torque and the first driving torque is reduced, thereby reducing the degree and time of abnormal noise and vibration of the vehicle, thus improving the smoothness of vehicle starting and the user experience.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and in particular, to a vehicle starting method and device. Background Art

[0002] With the gradual development of vehicles towards electrification, networking, intelligence, and sharing, people's demand for comfort during vehicle driving is increasing. Among them, whether the vehicle starts smoothly is the initial impression of users on the vehicle and an important part affecting the user experience.

[0003] The current vehicle starting method is as follows: After the vehicle starts, when the user shifts to D gear or R gear and then presses the brake pedal, the brake master cylinder starts to work, and the braking system starts to output braking torque. During the process of pressing the brake pedal, the setting signal of the brake light switch is generated, and then the user releases the brake pedal. During the process of the brake pedal returning to the initial position, the reset signal of the brake light switch is generated. When the vehicle detects the reset signal of the brake light switch, it outputs driving torque. However, since there is a certain stroke for the brake pedal to return to the initial position, and when the reset signal of the brake light switch is generated, the brake pedal has not returned to the initial position but still has a part of the stroke from the initial position (for example, the total stroke of the brake pedal is 60 mm, and when the brake light switch resets, the brake pedal still has 10 mm of stroke left to return to the initial position). At this time, since the brake pedal has not fully returned to the initial position, there is still braking torque. When the driving torque gradually increases to be equal to the braking torque, it reaches an equilibrium point. At this time, the vehicle speed is still zero. When the driving torque gradually increases to be greater than the braking torque, the vehicle speed starts to increase from zero, and the vehicle starts to move forward or backward.

[0004] However, when the braking torque and the driving torque exist simultaneously in the vehicle, it will cause the vehicle to make abnormal noises or even vibrate, thus bringing a poor user experience. Summary of the Invention

[0005] Embodiments of this application provide a vehicle starting method and device, which can solve the technical problems existing in the related art. The technical solutions of the vehicle starting method and device are as follows:

[0006] On the one hand, embodiments of this application provide a vehicle starting method, and the method includes:

[0007] After the vehicle starts, periodically obtain the pressure value of the brake master cylinder of the vehicle;

[0008] If within a first preset duration after detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when it is detected that the pressure value is equal to the target pressure value and the vehicle speed of the vehicle is zero, control the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch.

[0009] In a possible implementation manner, the method further includes:

[0010] Conduct multiple vehicle tests on the vehicle to determine the pressure values corresponding to multiple balance points, where the vehicle test includes controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch;

[0011] Based on the pressure values corresponding to the multiple balance points, determine the target pressure value.

[0012] In a possible implementation manner, the determining the target pressure value based on the pressure values corresponding to the multiple balance points includes:

[0013] Determine the average value between the pressure values corresponding to the multiple balance points as the target pressure value.

[0014] In a possible implementation manner, the pressure value is obtained based on a pressure sensor installed inside the brake master cylinder.

[0015] In a possible implementation manner, the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque in a creep mode when detecting the reset signal of the brake light switch;

[0016] The controlling the engine of the vehicle to output a first driving torque includes:

[0017] Control the engine of the vehicle to output a first driving torque in the creep mode.

[0018] In a possible implementation manner, the method further includes:

[0019] If within a second preset duration before detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when detecting the reset signal of the brake light switch and the vehicle speed of the vehicle is zero, control the engine of the vehicle to output a first driving torque.

[0020] On the other hand, an embodiment of the present application provides a vehicle starting device, and the device includes:

[0021] An acquisition module, configured to periodically acquire the pressure value of the master cylinder of the vehicle after the vehicle is started;

[0022] A control module, configured to: if the pressure value is detected to be equal to the target pressure value within a first preset duration after detecting the reset signal of the brake light switch, when the pressure value is detected to be equal to the target pressure value and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque when the reset signal of the brake light switch is detected.

[0023] In a possible implementation manner, the device further includes a test module, configured to:

[0024] Perform multiple vehicle tests on the vehicle to determine the pressure values corresponding to multiple balance points, where the vehicle test includes controlling the engine of the vehicle to output a second driving torque when the reset signal of the brake light switch is detected;

[0025] Determine the target pressure value based on the pressure values corresponding to the multiple balance points.

[0026] In a possible implementation manner, the test module is configured to:

[0027] Determine the average value between the pressure values corresponding to the multiple balance points as the target pressure value.

[0028] In a possible implementation manner, the pressure value is acquired based on a pressure sensor installed inside the master cylinder.

[0029] In a possible implementation manner, the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque in a creep mode when the reset signal of the brake light switch is detected;

[0030] The control module is configured to:

[0031] Control the engine of the vehicle to output the first driving torque in the creep mode.

[0032] In a possible implementation manner, the control module is further configured to:

[0033] If the pressure value is detected to be equal to the target pressure value within a second preset duration before detecting the reset signal of the brake light switch, when the reset signal of the brake light switch is detected and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque.

[0034] The technical solutions provided by the embodiments of the present application at least include the following beneficial effects:

[0035] The embodiments of the present application provide a vehicle starting method. After the vehicle is started, the pressure value of the vehicle's brake master cylinder is periodically obtained. If the pressure value is detected to be equal to the target pressure value within the first preset duration after detecting the reset signal of the brake light switch, then when the pressure value is detected to be equal to the target pressure value and the vehicle speed is zero, the engine of the vehicle is controlled to output a first driving torque. Since the target pressure value is less than the pressure value when the reset signal of the brake light switch is generated, at this time, the braking torque is already small. When the braking torque is small, the first driving torque is output, thereby reducing the degree of abnormal noise and vibration generated by the vehicle. In addition, since the first driving torque is output only when the braking torque is small, the braking torque will quickly decrease to zero. Therefore, the duration during which the braking torque and the first driving torque exist simultaneously is reduced, thereby reducing the time when the vehicle generates abnormal noise and vibration. Therefore, by adopting the present application, the degree and time of abnormal noise and vibration generated by the vehicle can be reduced, thereby improving the smoothness of vehicle starting and thus improving the user experience.

[0036] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a schematic diagram showing the movement of the brake pedal after stepping on the brake pedal in an embodiment of the present application;

[0039] Figure 2 is a schematic diagram showing the movement of the brake pedal after releasing the brake pedal in an embodiment of the present application;

[0040] Figure 3 is a schematic diagram showing a vehicle starting method in the prior art;

[0041] Figure 4 is a schematic diagram showing a vehicle starting method in an embodiment of the present application;

[0042] Figure 5 is a schematic diagram showing a vehicle starting method in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0044] The common method for a user to start a vehicle is as follows: When the user gets into the vehicle, start the vehicle, and then the user can shift to D gear or R gear. After shifting gears, the user can step on the brake pedal. At this time, the master cylinder of the vehicle's braking system starts to work, and the pressure value in the master cylinder gradually increases. The braking system starts to output braking torque. Then the user can release the brake pedal. At this time, the pressure value in the master cylinder gradually decreases, and the braking torque output by the braking system gradually decreases. After releasing the brake pedal, the vehicle's controller will control the engine to output driving torque, and at the same time the braking torque gradually decreases. When the driving torque is equal to the braking torque, it reaches an equilibrium point. When the driving torque is greater than the braking torque, the vehicle starts to move, that is, it starts to move forward or backward, thus completing the vehicle's start.

[0045] During the process of stepping on the brake pedal, a setting signal of the brake light switch will be triggered, as Figure 1 shown, Figure 1 which shows the movement process of the brake pedal after stepping on the brake pedal. Among them, point A is the initial position of the brake pedal, point B is the position where the brake pedal is fully depressed, and point C is the position of the brake pedal when the setting signal of the brake light switch is detected. During the process of releasing the brake pedal (that is, when the brake pedal returns to the initial position), a reset signal of the brake light switch will be triggered, as Figure 2 shown, Figure 2 which shows the movement process of the brake pedal after releasing the brake pedal. Among them, the meanings of points A and B are as above, and point D is the position of the brake pedal when the reset signal of the brake light switch is detected.

[0046] In the prior art, when the vehicle's controller detects the reset signal of the brake light switch, it controls the vehicle's engine to output a second driving torque. And because the brake pedal does not fully return to the initial position when the reset signal of the brake light switch occurs (as Figure 2 shown), therefore, when the reset signal of the brake light switch occurs, the braking system is still outputting braking torque. Then after the reset signal of the brake light switch, the braking torque and the driving torque exist simultaneously for a relatively long period of time. The simultaneous existence of the braking torque and the driving torque will cause the vehicle to make abnormal noises and even vibrate.

[0047] As Figure 3 shown, Figure 3 which shows the vehicle starting method in the prior art. Among them, point E is the time point when the controller detects the reset signal of the brake light switch, and point F is the equilibrium point when the braking torque is equal to the second driving torque. From Figure 3It can be seen that when the controller detects the reset signal of the brake light switch, the engine starts to output the second driving torque. After detecting the reset signal of the brake light switch, the braking torque starts to gradually decrease, and the second driving torque starts to gradually increase. When the braking torque is equal to the second driving torque, an equilibrium point is reached.

[0048] Next, a more detailed introduction to the method for determining the target pressure value in step 402 below will be given:

[0049] During vehicle production, the staff can conduct vehicle tests on the vehicle. That is, first start the vehicle, then shift to D gear or R gear, and then step on the brake pedal. During the process of stepping on the brake pedal, the vehicle's controller can detect the set signal of the brake light switch. Then the staff can release the brake pedal. During the process of the brake pedal returning to the initial position, the vehicle's controller can detect the reset signal of the brake light switch. At this time, the vehicle's engine can be controlled to output the second driving torque as in the prior art.

[0050] After the vehicle's engine starts to output the second driving torque, the braking torque and the driving torque coexist, and the braking torque is greater than the driving torque. As the brake pedal returns from the position when the reset signal of the brake light switch is detected to the initial position, the pressure value in the brake master cylinder gradually decreases, the braking torque gradually decreases, but the second driving torque gradually increases from zero. When the braking torque is equal to the driving torque, the equilibrium point (i.e., point F in Figure 3 ) is reached. At this time, the controller can obtain the pressure value of the brake master cylinder corresponding to the equilibrium point.

[0051] The target pressure value in the embodiments of the present application is the pressure value of the brake master cylinder corresponding to the equilibrium point determined by using the vehicle starting method in the prior art (i.e., controlling the engine to output the second driving torque when detecting the reset signal of the brake light switch).

[0052] In a possible implementation manner, in order to improve the accuracy of the target pressure value, the following settings can be made:

[0053] Conduct multiple vehicle tests on the vehicle to determine the pressure values corresponding to multiple equilibrium points. Among them, the vehicle test includes controlling the vehicle's engine to output the second driving torque when detecting the reset signal of the brake light switch; based on the pressure values corresponding to multiple equilibrium points, determine the target pressure value.

[0054] The above vehicle test is to use the vehicle starting method in the prior art to determine the pressure value of the brake master cylinder corresponding to the equilibrium point. In practice, in order to improve the accuracy of the target pressure value, multiple vehicle tests can be conducted on the vehicle respectively to determine the pressure values corresponding to multiple equilibrium points, and then the target pressure value can be determined based on these pressure values corresponding to multiple equilibrium points.

[0055] In a possible implementation, there are also various methods for determining the target pressure value based on the pressure values corresponding to the determined multiple balance points. For example, in the embodiments of the present application, the average value between the pressure values corresponding to these multiple balance points can be determined as the target pressure value.

[0056] Alternatively, the pressure values corresponding to these multiple balance points can be screened first. For example, inaccurate results that are significantly too large or too small can be removed, etc. The embodiments of the present application do not limit the screening method. After screening the pressure values corresponding to these multiple balance points, calculate the average value between the remaining pressure values corresponding to the multiple balance points, and then determine this average value as the target pressure value.

[0057] The method for determining the target pressure value based on the pressure values corresponding to multiple balance points can also be any other reasonable method, and the embodiments of the present application do not limit this.

[0058] In a possible implementation, to save costs, it is not necessary to conduct vehicle tests on each driven vehicle to determine the target pressure value corresponding to each vehicle. Only vehicle tests need to be conducted on vehicles of the same type as the driven vehicle to determine the target pressure value corresponding to this type of vehicle, that is, it can be determined as the target pressure value corresponding to each vehicle of this type.

[0059] The embodiments of the present application provide a vehicle starting method, as Figure 4 and Figure 5 shown, this method includes:

[0060] 401. After the vehicle starts, periodically obtain the pressure value of the brake master cylinder of the vehicle.

[0061] Among them, a pressure sensor is installed inside the brake master cylinder of the vehicle. The pressure sensor is electrically connected to the vehicle controller. After the vehicle starts, the pressure sensor can periodically detect the pressure value inside the brake master cylinder of the vehicle and send this pressure value to the controller. Therefore, the controller can periodically obtain the pressure value of the brake master cylinder of the vehicle.

[0062] In a possible implementation, the pressure sensor can be installed at any position where the pressure value inside the brake master cylinder can be accurately measured. For example, in addition to being directly installed inside the brake master cylinder as described above, it can also be installed inside a hydraulic circuit communicating with the inside of the brake master cylinder, etc. The present application does not limit the specific installation position of the pressure sensor.

[0063] 402. If the pressure value is detected to be equal to the target pressure value within the first preset time period after the reset signal of the brake light switch is detected, when the pressure value is detected to be equal to the target pressure value and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque.

[0064] Wherein, the target pressure value is the pressure value of the balance point determined after controlling the engine of the vehicle to output a second driving torque when the reset signal of the brake light switch is detected, that is, the pressure value of the brake master cylinder corresponding to the balance point determined by using the prior art vehicle starting method, which will not be elaborated here.

[0065] In implementation, after the user starts the vehicle, they can first shift to D gear or R gear, and then step on the brake pedal. During the process of stepping on the brake pedal, the pressure value inside the brake master cylinder will gradually increase, resulting in a gradual increase in the braking torque output by the braking system. At the same time, during the process of stepping on the brake pedal, when the brake pedal moves downward by a certain stroke, the controller can detect the set signal of the brake light switch.

[0066] After stepping on the brake pedal, the user can release the brake pedal. Without the external force applied by the user on the brake pedal, the brake pedal will move upward to return to the initial position. During the process of the brake pedal returning to the initial position, the pressure value inside the brake master cylinder will gradually decrease, resulting in a gradual decrease in the braking torque output by the braking system. At the same time, during the process of the brake pedal moving upward to the initial position, when the brake pedal moves upward by a certain stroke, the controller can detect the reset signal of the brake light switch.

[0067] It can be understood that the position of the brake pedal in the entire stroke when the controller detects the set signal of the brake light switch is the same as the position of the brake pedal in the entire stroke when the controller detects the reset signal of the brake light switch.

[0068] Normally, the pressure value of the brake master cylinder when the controller detects the reset signal of the brake light switch will be greater than the target pressure value. After that, as the brake pedal returns from the position when the brake light switch is reset to the initial position, the pressure value will gradually decrease.

[0069] When the controller detects the reset signal of the brake light switch, timing can start. If the pressure value is detected to be equal to the target pressure value within the first preset time period after the reset signal of the brake light switch is detected, and the current vehicle speed is zero, then when the pressure value is detected to be equal to the target pressure value, control the engine to output a first driving torque. Then, the first driving torque of the vehicle gradually increases from zero, and the braking torque gradually decreases. When the first driving torque is greater than the braking torque, the vehicle starts to move, thus completing the starting of the vehicle.

[0070] Such asFigure 5 As shown Figure 5 It shows a schematic diagram of the vehicle starting method provided by the embodiment of the present application. Among them, point E is the time point when the controller detects the reset signal of the brake light switch, and point F is the balance point determined during the vehicle test of the vehicle. At the time point corresponding to point F, the pressure value of the master cylinder is equal to the target pressure value. From Figure 5 It can be seen that when the reset signal of the brake light switch is detected, the engine is not controlled to input the first driving torque. Instead, when the pressure value of the master cylinder is equal to the target pressure value, the engine is controlled to output the first driving torque, that is, the first driving torque is output at point F.

[0071] Among them, the first preset duration can be any reasonable duration. For example, it can be 0.5s, etc. The staff can set it according to the requirements of the vehicle and the performance of the vehicle itself. The embodiment of the present application does not limit this.

[0072] In the above process, the judgment of "vehicle speed is zero" needs to determine that the vehicle is in a stopped state when the first driving torque is output.

[0073] In the above process, since when the pressure value drops to be equal to the target pressure value, and the target pressure value is less than the pressure value when the reset signal of the brake light switch is detected, therefore, the braking torque when the pressure value drops to the target pressure value is also less than the braking torque when the reset signal of the brake light switch is detected. That is, the engine is controlled to output the first driving torque when the braking torque is small. In this way, when the braking torque and the first driving torque exist simultaneously, the degree of abnormal noise emitted by the vehicle or the degree of vehicle vibration will be reduced. In addition, since the first driving torque is output when the braking torque is small, the braking torque will quickly drop to zero, and the duration when the braking torque and the first driving torque coexist will be short, thereby effectively reducing the degree of abnormal noise emitted by the vehicle and the degree of vibration generated, thereby improving the smoothness of vehicle starting and improving the user experience.

[0074] In a possible implementation manner, in order to improve the accuracy of the target pressure value, the output mode of the first driving torque can be the same as the output mode of the second driving torque, that is, as time changes, the numerical change of the first driving torque is the same as the numerical change of the second driving torque.

[0075] In the embodiment of the present application, the target pressure value can be the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output the second driving torque in the creep mode when the reset signal of the brake light switch is detected, that is, during the vehicle test of the vehicle, when the controller detects the reset signal of the brake light switch, the engine is controlled to output the second driving torque in the creep model.

[0076] When the vehicle is produced and sold to the user, and the user starts the vehicle, within the first preset duration after the controller detects the reset signal of the brake light switch, when it detects that the pressure value is equal to the target pressure value and the vehicle speed is zero, it controls the vehicle's engine to output the first driving torque in the creep mode.

[0077] In this way, both the first driving torque and the second driving torque are output in the creep mode, and a more accurate target pressure value can be obtained for the actual driving situation of the vehicle, thereby improving the starting stability of the vehicle.

[0078] In a possible implementation manner, during the use of the vehicle, various problems may occur due to equipment failures. For example, when the user releases the brake pedal, during the process of the brake pedal returning to the initial position, it will reach the reset position of the brake light switch, but due to the insensitivity or sudden short - circuit of the brake light switch, or due to signal loss during signal transmission, etc., it may cause the controller not to receive the reset signal of the brake light switch when the brake pedal has reached the position where the brake light switch is reset. When this situation occurs, it is easy to interfere with the starting of the vehicle. To solve the above problems, the vehicle starting method of the embodiments of the present application may further include the following steps:

[0079] If within the second preset duration before detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when detecting the reset signal of the brake light switch and the vehicle speed is zero, it controls the vehicle's engine to output the first driving torque.

[0080] In implementation, if it is detected that the pressure value of the master cylinder is equal to the target pressure value before detecting the reset signal of the brake light switch, it indicates that the above - mentioned problem may occur at this time. At this time, just wait for the second preset duration. If the reset signal of the brake light switch is detected within the second preset duration after detecting that the pressure value is equal to the target pressure value, it indicates that the brake light switch has a short - delay fault or the brake pedal has a relatively minor mechanical fault. In this case, it will not cause a great impact on the vehicle and the user. Therefore, the vehicle can continue to work. When detecting the reset signal of the brake light switch and the current vehicle speed is zero, then control the vehicle's engine to output the first driving torque when detecting the reset signal of the brake light switch. In this way, the vehicle can still start normally when a short - term minor fault occurs.

[0081] If the reset signal of the brake light switch is not detected within the second preset duration after detecting that the pressure value is equal to the target pressure value, the vehicle can emit an alarm signal to remind the user that some devices or components in the vehicle may have problems and need to be checked or repaired.

[0082] An embodiment of the present application further provides a vehicle starting device, which includes:

[0083] An acquisition module, configured to periodically acquire the pressure value of the master cylinder of the vehicle after the vehicle starts;

[0084] A control module, configured to, if within a first preset duration after detecting a reset signal of the brake light switch, detect that the pressure value is equal to a target pressure value, then when detecting that the pressure value is equal to the target pressure value and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch.

[0085] In a possible implementation manner, the device further includes a test module, configured to:

[0086] Conduct multiple vehicle tests on the vehicle to determine multiple pressure values corresponding to balance points, where the vehicle test includes controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch;

[0087] Based on the multiple pressure values corresponding to the balance points, determine the target pressure value.

[0088] In a possible implementation manner, the test module is configured to:

[0089] Determine the average value between the multiple pressure values corresponding to the balance points as the target pressure value.

[0090] In a possible implementation manner, the pressure value is acquired based on a pressure sensor installed inside the master cylinder.

[0091] In a possible implementation manner, the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque in a creep mode when detecting the reset signal of the brake light switch;

[0092] The control module is configured to:

[0093] Control the engine of the vehicle to output a first driving torque in the creep mode.

[0094] In a possible implementation manner, the control module is further configured to:

[0095] If the pressure value is detected to be equal to the target pressure value within a second preset duration before the reset signal of the brake lamp switch is detected, then when the reset signal of the brake lamp switch is detected and the vehicle speed of the vehicle is zero, control the engine of the vehicle to output a first driving torque.

[0096] The technical solution provided by the embodiments of the present application at least includes the following beneficial effects:

[0097] The embodiments of the present application provide a vehicle starting method. After the vehicle starts, the pressure value of the master cylinder of the vehicle is periodically obtained. If the pressure value is detected to be equal to the target pressure value within a first preset duration after the reset signal of the brake lamp switch is detected, then when the pressure value is detected to be equal to the target pressure value and the vehicle speed of the vehicle is zero, control the engine of the vehicle to output a first driving torque. Since the target pressure value is less than the pressure value when the reset signal of the brake lamp switch is generated, at this time, the braking torque is already small. Outputting the first driving torque when the braking torque is small reduces the degree of abnormal noise and vibration generated by the vehicle. In addition, since the first driving torque is output only when the braking torque is small, the braking torque will quickly decrease to zero. Therefore, the duration during which the braking torque and the first driving torque exist simultaneously is reduced, thereby reducing the time when the vehicle generates abnormal noise and vibration. Therefore, by adopting the present application, the degree and time of abnormal noise and vibration generated by the vehicle can be reduced, thereby improving the smoothness of vehicle starting and thus improving the user experience.

[0098] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle starting method, characterized in that, the method includes: After the vehicle starts, periodically obtain the pressure value of the brake master cylinder of the vehicle; If within a first preset duration after detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when it is detected that the pressure value is equal to the target pressure value and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point when the braking torque determined after controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch is equal to the second driving torque; If within a second preset duration before detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when detecting the reset signal of the brake light switch and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque; The method further includes: Conduct multiple vehicle tests on the vehicle to determine the pressure values corresponding to multiple balance points, where the vehicle test includes controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch; Determine the average value between the pressure values corresponding to the multiple balance points as the target pressure value.

2. The vehicle starting method according to claim 1, characterized in that, the pressure value is obtained based on a pressure sensor installed inside the brake master cylinder.

3. The vehicle starting method according to claim 1, characterized in that, the target pressure value is the pressure value corresponding to the balance point determined after controlling the engine of the vehicle to output a second driving torque in a creep mode when detecting the reset signal of the brake light switch; Controlling the engine of the vehicle to output a first driving torque includes: Controlling the engine of the vehicle to output a first driving torque in the creep mode.

4. A vehicle starting device, characterized in that, the device includes: An acquisition module, configured to periodically obtain the pressure value of the brake master cylinder of the vehicle after the vehicle starts; A control module, configured to, if within a first preset duration after detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when it is detected that the pressure value is equal to the target pressure value and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque, where the target pressure value is the pressure value corresponding to the balance point when the braking torque determined after controlling the engine of the vehicle to output a second driving torque when detecting the reset signal of the brake light switch is equal to the second driving torque; The control module is further configured to: if within a second preset duration before detecting the reset signal of the brake light switch, it is detected that the pressure value is equal to the target pressure value, then when detecting the reset signal of the brake light switch and the vehicle speed is zero, control the engine of the vehicle to output a first driving torque; The device further includes a test module, configured to: Perform multiple vehicle tests on the vehicle to determine the pressure values corresponding to multiple balance points, wherein the vehicle test includes controlling the engine of the vehicle to output a second driving torque when a reset signal of the brake lamp switch is detected; Determine the average value between the pressure values corresponding to the multiple balance points as the target pressure value.

5. The vehicle starting device according to claim 4, characterized in that the target pressure value is the pressure value of the balance point determined after controlling the engine of the vehicle to output a second driving torque in a creep mode when a reset signal of the brake lamp switch is detected; The control module is configured to: Control the engine of the vehicle to output a first driving torque in the creep mode.

Images