New energy commercial vehicle starting protection control method and commercial vehicle

Abstract

The invention discloses a new energy commercial vehicle starting protection control method and a commercial vehicle, and the method comprises the following steps: collecting the state information of a current vehicle, and judging whether the vehicle is in a starting protection stage or not; in the starting protection stage, accelerator pedal state information of the vehicle is obtained, and whether an acceleration abnormal request exists or not is judged based on the accelerator pedal state information; and if not, executing an acceleration request corresponding to the accelerator pedal and outputting the corresponding torque, and if yes, limiting the output of the torque and sending out an alarm through a vehicle-mounted alarm. The method has the advantages that mistakenly stepping on the accelerator pedal is limited through the strategy, the safety of the commercial vehicle is improved, and safety accidents in the starting stage are avoided. And the problem of collision caused by rapid acceleration of the vehicle due to mistaken stepping or violent stepping of the accelerator pedal during starting of a customer can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle starting control, and in particular to a starting protection control method for a new energy commercial vehicle. Background Art

[0002] With the development of new energy technology, traditional fuel vehicles are gradually replaced by electric vehicles, and this trend has gradually shifted from passenger cars to commercial vehicles. New energy vehicles generally use power batteries as the power source and motors as the driving components to drive the vehicle. Since electric vehicles use power batteries and motors to drive the vehicle, and motors have the advantage of fast transmission, after being applied to commercial vehicles, the performance of commercial vehicles has been greatly improved.

[0003] Taking light trucks as an example among commercial vehicles, as light trucks are converted from gasoline trucks to electric trucks, the excellent motor performance and characteristics make light trucks have acceleration performance similar to that of passenger cars. For example, the acceleration from 0 to 50 km / h can reach about 3.2 seconds. High acceleration performance may be an advantage for passenger cars, but for light trucks and heavy trucks with large inertia and large cargo loads, certain defects will occur in some extreme cases. For example, at the starting stage, if the accelerator pedal is accidentally stepped on, the motor can output to full power in a short time, and the truck will rush forward quickly. Due to the loading and quality of the truck, the risk of collision caused by accidentally stepping on the accelerator pedal under this acceleration performance is often very terrible, which will cause serious safety accidents. Therefore, it is necessary to solve the defect of accidentally triggering the accelerator pedal of light trucks, heavy trucks and other cargo vehicles in the commercial vehicle category. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a new energy commercial vehicle starting protection control method, which limits the accidental stepping on the accelerator pedal through a strategy, improves the safety of the commercial vehicle, and avoids safety accidents during the starting phase.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a starting protection control method for a new energy commercial vehicle, comprising the following steps:

[0006] Collect the current vehicle status information to determine whether it is in the starting protection stage; when in the starting protection stage, obtain the vehicle's accelerator pedal status information, and determine whether it is an abnormal acceleration request based on the accelerator pedal status information; if not, execute the acceleration request corresponding to the accelerator pedal and output the corresponding torque; if so, limit the torque output and issue an alarm reminder through the vehicle alarm.

[0007] The vehicle status information collected includes the gear signal status, vehicle speed signal, and brake switch status. Based on the gear signal status, vehicle speed signal, and brake switch status, it is determined whether to enter the starting protection stage. If it is determined that the vehicle is currently in the driving gear, the brake switch is in an invalid state, and the vehicle speed is lower than the set speed threshold, it is determined to enter the starting protection stage.

[0008] The state information of the accelerator pedal is collected, and based on the rate of change of the accelerator pedal opening, it is determined whether the acceleration request triggered by the accelerator pedal at this time is an abnormal acceleration request.

[0009] When the accelerator pedal opening change rate within the set time is greater than the set threshold, the acceleration request at this time is judged to be an abnormal acceleration request; when it is judged that the accelerator pedal is stepped on and it is an abnormal acceleration request, the vehicle torque and / or power output is limited.

[0010] When it is determined that the acceleration request is abnormal, the instrument and / or display screen in the driving vehicle issues a reminder of the abnormal accelerator pedal in the form of graphics or text.

[0011] When limiting the vehicle output torque, the accelerator pedal changes are monitored. When the accelerator pedal opening is less than the set threshold, the torque output limit is cancelled and the torque output is responded to according to the accelerator pedal opening.

[0012] After determining that the accelerator pedal is depressed as an abnormal acceleration request, the driver's true intention is predicted, and the torque output restriction is canceled or maintained according to the driver's true intention.

[0013] After determining that the accelerator pedal is depressed as an abnormal acceleration request, the obstacle in front of the vehicle is detected. When the distance between the vehicle and the obstacle in front is less than the safety distance threshold, the output torque is limited, and the torque is cleared or emergency braking is performed when necessary.

[0014] If it is determined that the vehicle is currently in R gear, the brake switch is in an invalid state and the vehicle speed is lower than the set speed threshold, it is determined to enter the reverse start protection stage. At this time, the vehicle's output torque is limited within a fixed threshold, and the power output is limited to limit the vehicle speed within the set range.

[0015] A new energy commercial vehicle adopts the starting protection control method to control the starting of the vehicle.

[0016] The advantages of the present invention are: by limiting the accidental stepping on the accelerator pedal through strategies, the safety of commercial vehicles is improved, and safety accidents at the start-up stage are avoided. It can effectively prevent the problem of rapid acceleration of the vehicle caused by the customer's accidental or sudden stepping on the accelerator pedal when starting, and then the collision caused. In extreme cases, the user's real acceleration needs are met, the user experience is improved, and the user's real acceleration needs are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0018] Figure 1 It is a schematic flow chart of the starting protection control method of the present invention. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0020] This embodiment provides a starting protection control strategy for a light truck VCU, which solves the problem of sudden acceleration of the vehicle caused by accidentally or violently stepping on the accelerator pedal when starting existing trucks and other commercial vehicles, and serious accidents caused by serious collisions due to the large inertia and mass of the truck. Taking a light truck as an example, the starting protection control strategy can be integrated into the vehicle controller VCU or power domain controller of the light truck to achieve the corresponding protection function. This solution is introduced as follows by taking integration in the VCU as an example:

[0021] This embodiment provides a commercial vehicle start protection control method, the commercial vehicle includes light trucks, heavy trucks and other models, the protection control method is integrated in the on-board VCU of the commercial vehicle, and the corresponding start protection can be achieved by running the method. The hardware parts involved in the commercial vehicle start protection control method include: VCU, on-board sensors, vehicle power module, etc. The on-board sensors are used to collect vehicle parameter data required by the VCU, and the VCU performs logical analysis based on these data, and then controls the power output of the vehicle power module based on the analysis results to control the output torque.

[0022] The data is finally detected and aggregated into the VCU. The VCU detects and obtains various vehicle status data based on various sensors and CAN reading vehicle signals. The detection and judgment functions of the VCU include but are not limited to:

[0023] 1. VCU detects the validity of the current key switch;

[0024] 2. VCU detects current fault information;

[0025] 3. VCU detects the validity of the current brake switch signal;

[0026] 4. VCU detects the validity of the current hand brake signal;

[0027] 5. VCU detects the current gear information status;

[0028] 6. VCU detects the electronic throttle opening and its rate of change;

[0029] 7. VCU detects the current vehicle speed;

[0030] 8. VCU detects the current driving mode;

[0031] 9. VCU outputs control torque to MCU;

[0032] 10. VCU outputs fault indication to the instrument;

[0033] By collecting and judging data through the VCU to control the power output torque, it can effectively prevent the customer from accidentally or suddenly stepping on the accelerator pedal when starting, causing the vehicle to accelerate suddenly and thus cause a collision.

[0034] like Figure 1 As shown, a new energy commercial vehicle starting protection control method includes the following steps:

[0035] Step 1: Collect the current vehicle status information to determine whether it is in the start protection stage;

[0036] Step 2: When in the starting protection stage, obtain the vehicle's accelerator pedal status information, and determine whether it is an abnormal acceleration request based on the accelerator pedal status information; if not, execute the acceleration request corresponding to the accelerator pedal and output the corresponding torque; if so, limit the torque output and issue an alarm reminder through the vehicle alarm.

[0037] The vehicle status information collected in step 1 includes the gear signal status, vehicle speed signal, and brake switch status. The acquisition hardware used includes a gear sensor, a vehicle speed sensor, and a brake switch status sensor, or directly collects and reads the signal in the vehicle CAN network and parses the corresponding data. Because the vehicle status information is generally transmitted interactively through the vehicle CAN network, the vehicle VCU can read the relevant data through the CAN network.

[0038] Based on the gear signal status, vehicle speed signal, and brake switch status, it is determined whether to enter the start protection stage. If it is determined that the vehicle is currently in the drive gear, the brake switch is in an invalid state, and the vehicle speed is lower than the set speed threshold, it is determined to enter the forward start protection stage. If it is determined that the vehicle is currently in the drive gear, the brake switch is in an invalid state, and the vehicle speed is lower than the set speed threshold, it is determined to enter the reverse start protection stage. Whether it is the reverse start protection stage or the forward start protection stage, both are limited by the mass of the truck when starting. If the speed is increased too quickly, a serious accident may occur or even the risk of overturning. Therefore, it is necessary to restrict vehicles in these two states.

[0039] Forward start protection stage:

[0040] When entering the forward start protection phase, the status information of the accelerator pedal is collected, and based on the accelerator pedal opening change rate, it is determined whether the acceleration request triggered by the accelerator pedal at this time is an abnormal acceleration request. When the accelerator pedal opening change rate within the set time is greater than the set threshold, the acceleration request at this time is determined to be an abnormal acceleration request; when it is determined that it is an abnormal acceleration request after the accelerator pedal is stepped on, the vehicle torque and / or power output is limited, thereby limiting the acceleration of the truck to avoid safety hazards caused by rapid acceleration. If the rate of change of the heating pedal is too large, it means that the accelerator is stepped on suddenly, so this working condition needs to be limited. Generally, the rate of change of the opening degree, or the rate of change of the accelerator pedal within a set time range is used. For example, if the rate of change of the accelerator pedal opening degree is greater than 96% within 1000ms, it is judged that the acceleration request after the accelerator pedal is pressed is an abnormal acceleration request, otherwise it is judged to be a normal acceleration request. If it is a normal acceleration request, the corresponding power torque is output according to the normal acceleration request to achieve vehicle acceleration control; if it is an abnormal acceleration request, it cannot be executed at this time, and the VCU limits the torque output, thereby completing the limitation of the truck's speed increase. The torque output can be limited by limiting the power and torque of the drive motor to achieve the corresponding purpose of limiting the torque output and limiting the speed increase.

[0041] When it is determined that the acceleration request is abnormal, the VCU limits the output torque, so it is necessary to remind the user to avoid the user's misjudgment of the vehicle status. Therefore, the VCU drives the in-vehicle instrument and / or display to issue a reminder of the abnormal accelerator pedal in the form of graphics and text. The user is reminded at this time by lighting the instrument turtle light and displaying text on the display. Specifically, the instrument turtle light is lit, and the instrument issues a corresponding alarm prompt ("Do not step on the accelerator too hard", etc.).

[0042] When limiting the vehicle's output torque, monitor changes in the accelerator pedal and the vehicle speed. When the accelerator pedal opening is less than the set threshold or the real-time vehicle speed is greater than the set speed threshold, the torque output limit is canceled and the torque output is responded to according to the accelerator pedal opening. That is, when it is detected that the opening of the accelerator pedal is less than 20% of the full opening (the pressed opening is less than 20% of the full opening), the torque output limit is determined to be cancelled, and the vehicle is controlled according to the output torque corresponding to the pressed opening of the accelerator pedal; when it is detected that the vehicle speed is greater than the vehicle speed threshold, such as the vehicle speed is greater than 10km / h, it means that it is no longer in the starting stage, so the torque output limit is also cancelled at this time, and the vehicle is controlled according to the output torque corresponding to the pressed opening of the accelerator pedal. The purpose of this method is that when the user does not step on the accelerator deeply to accelerate suddenly and the vehicle speed has slowly accelerated to a certain speed, it is no longer in the starting stage. At this time, there is no need to limit the torque of the vehicle, thereby protecting the safety of the vehicle at the foreground start and avoiding safety risks caused by false triggering. After the vehicle speed gradually increases to a certain speed under the torque limit, the torque limit is cancelled, and when the driver's accelerator pedal changes from deep depression to shallow depression, the normal torque output is restored at this time, and the output torque corresponding to the depth of the accelerator pedal is used to meet normal acceleration control.

[0043] Although a truck that steps deeply on the accelerator at the start-up stage is more likely to be triggered by mistake, it is also possible that the driver intentionally does so to avoid risks, such as avoiding collisions, etc. Therefore, the driver's true intention must also be considered, and the driver's true intention must be checked immediately while limiting the torque output. If it is detected that the driver's true intention is to accelerate, the torque limit is canceled, and the power torque output is performed according to the driver's intention, thereby better meeting the driver's actual needs and improving the user experience. That is, in this embodiment, after determining that the accelerator pedal is stepped on as an abnormal acceleration request, the driver's true intention is predicted, and the torque output restriction is controlled to be canceled or maintained according to the driver's true intention.

[0044] There are many ways to predict driver intention. Method 1: Use the driver's facial data collected by the on-board camera to detect whether the driver is in a panic or misoperation state. If so, it is determined that the driver's intention is not to accelerate suddenly, and the output torque limit is maintained. Otherwise, if it is determined through image analysis that the driver is not in a panic or misoperation state, the driver's facial expression and other analysis can determine the driver's needs for sudden acceleration, then the torque limit is canceled, and the torque output is controlled according to the depth of the driver's real-time accelerator pedal depression, thereby realizing the judgment of the driver's intention and the torque output control based on the driver's intention.

[0045] Method 2: Collect the trend of the accelerator pedal stroke change. If two or more sudden accelerator pedal steps are collected in a short period of time, it is judged that the driver's real intention at this time is to accelerate suddenly. At this time, the output torque corresponding to the actual accelerator pedal stepping depth is used to control the vehicle acceleration. The sudden accelerator pedal stepping refers to the accelerator pedal opening value changing from small to large within the set time range. When the accelerator pedal is stepped on suddenly twice, it means that the accelerator pedal opening value changes from a smaller opening value to a larger opening value, then to a smaller opening value, and then from a smaller opening value to a larger opening value, and the time of this change is within the set time threshold. This time threshold is very short. This reflects that the driver stepped on the accelerator pedal twice quickly, indicating that the driver's real demand is acceleration. Therefore, the torque limit is canceled at this time, and the torque is output according to the actual accelerator pedal stepping depth of the driver. The smaller opening value here refers to the brake pedal opening of 0 or its adjacent opening, and the larger opening refers to the opening of 100% and its vicinity. If it is detected that the opening value remains greater than 95% of the full-scale opening after the accelerator pedal is pressed, and this opening value is maintained for a certain period of time, it means that the accelerator pedal may be mistakenly triggered and has been pressed all the way. At this time, there is no need to cancel the torque limit. Maintain the torque output limit until the vehicle speed does not meet the requirements.

[0046] In a preferred embodiment, after judging that the accelerator pedal is stepped on and it is an abnormal acceleration request, the obstacle in front of the vehicle is detected. When the distance between the vehicle and the obstacle in front is less than the safety distance threshold, the output torque is limited, and the torque is reset or emergency braking is performed when necessary. The torque output is limited when an abnormal acceleration request is made, thereby ensuring safety, until the vehicle speed reaches the requirement to cancel the torque limit. However, in order to avoid collision accidents, before canceling the torque output limit, the obstacle in front of the vehicle is detected by the on-board front vehicle radar. When the distance is less than the safety distance threshold, the torque output limit is maintained (torque is reset or emergency braking is performed when necessary) until the distance is greater than the set safety distance threshold, thereby achieving the purpose of safety.

[0047] Reverse start protection:

[0048] During the reverse start protection stage, since reverse does not require a large torque output and does not require a large acceleration, when it is determined that the vehicle is currently in R gear, the brake switch is in an invalid state and the vehicle speed is lower than the set speed threshold, it is determined to enter the reverse start protection stage. In this stage, the vehicle's output torque is directly limited within a fixed threshold, and the power output is limited to limit the vehicle speed within the set range, thereby avoiding false triggering during reverse start and avoiding safety hazards caused by rapid acceleration after the accelerator pedal is accidentally pressed in an emergency when reversing.

[0049] The present solution also provides a new energy commercial vehicle, which uses the start protection control method in the above embodiment to control the start of the vehicle, so that the commercial vehicle has the advantages of the above start protection control method.

[0050] like Figure 1 As shown, the present application provides a specific solution for the forward start protection strategy. When the key switch is valid, there is no fault information, and the READY indicator light is on after the VCU self-check passes, the driving mode satisfies the drivable state;

[0051] At this time, the gear signal status, vehicle speed signal, brake switch and handbrake switch validity, and accelerator pedal opening signal are detected; if the following conditions are met: the vehicle is currently in drive gear, the brake switch and handbrake switch are invalid, the vehicle speed is 0<V<5km / h, and the accelerator pedal opening change rate within 1000ms is >96%; then the starting protection strategy is entered, the VCU limits the torque output (the speed is the creeping speed, about 8km / h), the instrument turtle light is turned on, and the instrument gives corresponding alarm prompts ("Do not step on the accelerator hard", etc.); at this time, the driver needs to release the accelerator pedal (the accelerator pedal opening is less than 20%) to release the protection and the vehicle enters creeping; then lightly stepping on the accelerator can respond to the torque output normally.

[0052] In the present invention, the VCU will detect the current key signal status, fault information, gear information status, accelerator pedal opening, vehicle speed signal, brake switch status, hand brake signal, etc. to determine the current driver's operating intention. For example, when starting from a standstill (vehicle speed is less than 5km / h), the accelerator pedal opening change rate is greater than 96% in a short time (1000ms). At this time, the VCU limits the torque output (controls the current maximum vehicle speed to the creeping speed), and simultaneously lights the instrument fault signal light, and feeds back the prompt information on the instrument to warn the driver. After the driver recognizes it, he lifts the accelerator pedal until the opening is less than 20% to restore the limit, and then lightly presses the accelerator to respond to the torque output normally. The solution of the above embodiment solves the problem of rapid acceleration of the vehicle caused by customers accidentally stepping on or violently stepping on the accelerator pedal when starting, which in turn causes collisions.

[0053] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A new energy commercial vehicle starting protection control method, characterized in that: The steps include: Collect the current vehicle status information to determine whether it is in the starting protection stage; when in the starting protection stage, obtain the vehicle's accelerator pedal status information, and determine whether it is an abnormal acceleration request based on the accelerator pedal status information; if not, execute the acceleration request corresponding to the accelerator pedal and output the corresponding torque; if so, limit the torque output and issue an alarm reminder through the vehicle alarm.

2. A new energy commercial vehicle starting protection control method as claimed in claim 1, characterized in that: The vehicle status information collected includes the gear signal status, vehicle speed signal, and brake switch status. Based on the gear signal status, vehicle speed signal, and brake switch status, it is determined whether to enter the starting protection stage. If it is determined that the vehicle is currently in the driving gear, the brake switch is in an invalid state, and the vehicle speed is lower than the set speed threshold, it is determined to enter the starting protection stage.

3. A new energy commercial vehicle starting protection control method as claimed in claim 2, characterized in that: The state information of the accelerator pedal is collected, and based on the rate of change of the accelerator pedal opening, it is determined whether the acceleration request triggered by the accelerator pedal at this time is an abnormal acceleration request.

4. A new energy commercial vehicle starting protection control method as claimed in claim 3, characterized in that: When the accelerator pedal opening change rate within the set time is greater than the set threshold, the acceleration request at this time is judged to be an abnormal acceleration request; When it is determined that the accelerator pedal is depressed and an abnormal acceleration request is made, the vehicle torque and / or power output is limited.

5. A new energy commercial vehicle starting protection control method as claimed in claim 4, characterized in that: When it is determined that the acceleration request is abnormal, the instrument and / or display screen in the driving vehicle issues a reminder of the abnormal accelerator pedal in the form of graphics or text.

6. A starting protection control method for a new energy commercial vehicle according to any one of claims 1 to 5, characterized in that: When limiting the vehicle output torque, the accelerator pedal changes are monitored. When the accelerator pedal opening is less than the set threshold, the torque output limit is cancelled and the torque output is responded to according to the accelerator pedal opening.

7. A starting protection control method for a new energy commercial vehicle according to any one of claims 1 to 5, characterized in that: After determining that the accelerator pedal is depressed as an abnormal acceleration request, the driver's true intention is predicted, and the torque output restriction is canceled or maintained according to the driver's true intention.

8. A new energy commercial vehicle starting protection control method as claimed in claim 7, characterized in that: After determining that the accelerator pedal is depressed as an abnormal acceleration request, the obstacle in front of the vehicle is detected. When the distance between the vehicle and the obstacle in front is less than the safety distance threshold, the output torque is limited or emergency braking is performed.

9. A new energy commercial vehicle starting protection control method as claimed in claim 2, characterized in that: If it is determined that the vehicle is currently in R gear, the brake switch is in an invalid state and the vehicle speed is lower than the set speed threshold, it is determined to enter the reverse start protection stage. At this time, the vehicle's output torque is limited within a fixed threshold, and the power output is limited to limit the vehicle speed within the set range.

10. A new energy commercial vehicle, characterized in that: The new energy commercial vehicle uses the starting protection control method as described in any one of claims 1 to 9 to control the starting of the vehicle.

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