Pure electric logistics vehicle abrupt slope slow descent control system and method

Abstract

The invention discloses an abrupt slope slow descent control method for a pure electric logistics vehicle in the field of abrupt slope slow descent control of the pure electric logistics vehicle, which comprises combined keys and a control module, the combined keys comprise an activation key, a cancel key, a vehicle speed increase key and a vehicle speed decrease key, and the control module comprises a vehicle controller and a motor controller. And the whole vehicle controller is connected with the motor controller. Aiming at the working condition that a driver needs to frequently step on a brake pedal to achieve speed reduction under the road condition that the vehicle runs on the steep slope for a long time, the invention provides a control method for slowly descending the steep slope by introducing an energy recovery mechanism, and when the vehicle speed reaches a driving intention value of the driver, the driver only needs to press an activation key to start a steep slope slow descending function, so that the vehicle speed is reduced. The vehicle can run at a constant speed at a set vehicle speed only by stepping on the vehicle, so that brake pad abrasion, heating and personnel fatigue caused by frequent brake stepping are reduced, downhill energy can be recycled, and the driving safety and the energy efficiency economy are improved.

Description

Technical Field

[0001] The present invention relates to the field of steep slope descent control for a pure electric logistics vehicle, and in particular to a steep slope descent control system and method for a pure electric logistics vehicle. Background Art

[0002] When an electric logistics vehicle is driving downhill, the vehicle speed is usually reduced by stepping on the brakes. If a long downhill section is encountered during driving, the driver needs to frequently step on the brake pedal to slow down. This not only causes the brake pads to repeatedly rub and overheat, leading to brake failure, accelerated wear and shortened life, but also causes the driver to become easily fatigued when driving for a long time, thus creating certain safety hazards.

[0003] In order to deal with the situation where the driver needs to frequently step on the brake pedal to slow down when encountering a long downhill section during driving, some electric logistics vehicles have adopted the steep slope descent function, that is, when the vehicle is driving on a continuous downhill road, the driver can activate the steep slope descent function by pressing the steep slope descent function start button, and use the vehicle speed obtained at the moment of activation to maintain it, so as to control the vehicle to drive steadily at the speed obtained at the moment of activation during the entire downhill period and the entire process of the steep slope descent function being activated. When the vehicle is in the steep slope descent activation state, when the driver needs to accelerate or decelerate appropriately, he can only accelerate by stepping on the accelerator pedal and decelerate by stepping on the brake pedal. When the driver steps on the accelerator pedal or the brake pedal, the system will exit the steep slope descent function. If you need to enter it, you need to re-activate it. This has increased the complexity of the operation to a certain extent and affected the driving experience.

[0004] Therefore, those skilled in the art provide a steep slope descent control system and method for a pure electric logistics vehicle to solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to provide a steep slope descent control method for a pure electric logistics vehicle to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for controlling a steep slope descent of a pure electric logistics vehicle comprises a combination button and a control module, wherein the combination button comprises an activation button, a cancel button, a speed increase button and a speed decrease button, wherein the control module comprises a vehicle controller and a motor controller, wherein the vehicle controller is interconnected with the motor controller, and the vehicle controller is also electrically connected to the combination button, wherein the vehicle controller is also connected to an instrument display module and a power battery system, and the motor controller is electrically connected to the motor, wherein the control module can obtain the switch state of the button combination, cache the set speed for steep slope descent, obtain the current speed from the vehicle, obtain the brake pedal, the accelerator pedal, the gear position state, and obtain the power battery voltage, current, and SOC state, and when the vehicle meets the following conditions, the driver presses the activation button to enter the steep slope descent mode;

[0008] 1) The vehicle is in a drivable state;

[0009] 2) The vehicle gear is in D gear;

[0010] 3) The current vehicle speed is between 5 and 35 km / h;

[0011] 4) Power battery SOC<97%;

[0012] 5) The power battery has no fault alarm;

[0013] 6) The vehicle has no faults that may affect the normal operation of the motor, motor controller, or power battery;

[0014] When the vehicle enters the steep hill descent mode, the corresponding "steep hill descent" function indicator light is turned on on the instrument panel.

[0015] A method for controlling a steep slope descent of a pure electric logistics vehicle, wherein the vehicle speed control includes the following processes:

[0016] The vehicle speed V1 obtained at the moment of activating the steep slope descent function is used as the currently set vehicle speed. When the vehicle speed increases due to the downhill gravity, the vehicle controller sends a negative torque command to the motor controller to enable the motor energy recovery mode, thereby generating electric braking force and controlling the vehicle speed at the set speed V1;

[0017] On a downhill section, if you encounter a sharp turn or other road conditions that require further emergency deceleration, you can step on the brake pedal to reduce the vehicle speed to below the currently set speed. When the brake pedal is released, the vehicle speed increases to the speed value V1 set in the current steep slope descent mode through downhill gravity, and then continues to drive at the set speed value V1;

[0018] As a further solution of the present invention: when the vehicle needs to slow down in a non-emergency situation, the vehicle can be decelerated by pressing the speed reduction button. The specific strategy is that the vehicle speed can be reduced by 1km / h each time the speed reduction button is pressed.

[0019] As a further solution of the present invention: when the driver needs to increase the vehicle speed, he can accelerate by pressing the vehicle speed increase button. The specific strategy is that each time the vehicle speed increase button is pressed, the vehicle speed can be increased by 1 km / h.

[0020] As a further solution of the present invention, the exit of the steep slope descent control function is divided into two modes: active exit and passive exit.

[0021] As a further solution of the present invention: Active withdrawal includes the following conditions:

[0022] 1) The driver actively presses the "Cancel" button to exit;

[0023] 2) The vehicle gear is not in D gear;

[0024] 3) The vehicle is under high and low voltage electricity;

[0025] 4) The handbrake is pulled up;

[0026] 5) Press the accelerator pedal.

[0027] As a further solution of the present invention: passive withdrawal includes the following conditions:

[0028] 1) The current actual vehicle speed is not within the range of 5 to 37 km / h;

[0029] 2) The power battery reports a fault;

[0030] 3) The motor controller or the vehicle reports a fault that affects the normal operation of the motor, motor controller, or power battery.

[0031] As a further solution of the present invention: when the steep slope descent control function is exited, the "steep slope descent control" function indicator light on the instrument panel is turned off synchronously.

[0032] As a further solution of the present invention: when the steep hill descent function is passively exited, the vehicle emits an alarm prompt sound and simultaneously displays a corresponding alarm message on the instrument panel to remind the driver that the vehicle speed cannot be controlled by the steep hill descent function at this time, and the driver takes over and controls the vehicle speed.

[0033] The present invention aims at the working condition that when the vehicle is traveling down a long steep slope, the driver needs to frequently step on the brake pedal to achieve deceleration. The present invention provides a control method for steep slope descent by introducing an energy recovery mechanism. When the vehicle speed reaches the value intended by the driver, the driver only needs to press an activation button to start the steep slope descent function, and the vehicle can travel at a constant speed at the set vehicle speed. This not only reduces the wear of the brake pads, heat, and personnel fatigue caused by frequent braking, but also helps to recycle downhill energy, thereby improving driving safety and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a work flow chart of the present invention; DETAILED DESCRIPTION

[0036] See also Figures 1-2 In an embodiment of the present invention, a method for controlling a steep slope descent of a pure electric logistics vehicle includes a combination button and a control module. The combination button includes an activation button, a cancel button, a speed increase button, and a speed decrease button. The control module includes a vehicle controller and a motor controller. The vehicle controller is interconnected with the motor controller. The vehicle controller is also electrically connected to the combination button. The vehicle controller is also connected to an instrument display module and a power battery system. The motor controller is electrically connected to the motor. The control module can obtain the switch state of the button combination, cache the set speed of the steep slope descent, and obtain the current speed from the vehicle, obtain the brake pedal, the accelerator pedal, the gear position state, and obtain the power battery voltage, current, and SOC state. When the vehicle meets the following conditions, the driver presses the activation button to enter the steep slope descent mode;

[0037] 1) The vehicle is in a drivable state;

[0038] 2) The vehicle gear is in D gear;

[0039] 3) The current vehicle speed is between 5 and 35 km / h;

[0040] 4) Power battery SOC<97%;

[0041] 5) The power battery has no fault alarm;

[0042] 6) The vehicle has no faults that may affect the normal operation of the motor, motor controller, or power battery;

[0043] When the vehicle enters the steep hill descent mode, the corresponding "steep hill descent" function indicator light is turned on on the instrument panel.

[0044] A method for controlling a steep slope descent of a pure electric logistics vehicle, wherein the vehicle speed control includes the following processes:

[0045] The vehicle speed V1 obtained at the moment of activating the steep slope descent function is used as the currently set vehicle speed. When the vehicle speed increases due to the downhill gravity, the vehicle controller sends a negative torque command to the motor controller to enable the motor energy recovery mode, thereby generating electric braking force and controlling the vehicle speed at the set speed V1;

[0046] On a downhill section, if you encounter a sharp turn or other road conditions that require further emergency deceleration, you can step on the brake pedal to reduce the vehicle speed to below the currently set speed. When the brake pedal is released, the vehicle speed increases to the speed value V1 set in the current steep slope descent mode through downhill gravity, and then continues to drive at the set speed value V1;

[0047] Among them, when the vehicle needs to slow down in a non-emergency situation, you can slow down by pressing the speed reduction button. The specific strategy is that each time you press the speed reduction button, the speed can be reduced by 1km / h;

[0048] Among them, when the driver needs to increase the speed, he can accelerate by pressing the speed plus button. The specific strategy is that each time the speed plus button is pressed, the speed can increase by 1km / h.

[0049] Among them, the exit of the steep slope descent function is divided into two modes: active exit and passive exit.

[0050] Among them, active withdrawal includes the following conditions:

[0051] 1) The driver actively presses the "Cancel" button to exit;

[0052] 2) The vehicle gear is not in D gear;

[0053] 3) The vehicle is under high and low voltage electricity;

[0054] 4) The handbrake is pulled up;

[0055] 5) Press the accelerator pedal.

[0056] Passive withdrawal includes the following conditions:

[0057] 1) The current actual vehicle speed is not within the range of 5 to 37 km / h;

[0058] 2) The power battery reports a fault;

[0059] 3) The motor controller or the vehicle reports a fault that affects the normal operation of the motor, motor controller, or power battery.

[0060] Among them, when the steep slope descent function is exited, the "steep slope descent" function indicator light on the instrument panel will go out simultaneously.

[0061] Among them, when the steep hill descent function is passively exited, the vehicle will issue an alarm prompt sound and simultaneously display the corresponding alarm information on the instrument panel to remind the driver that the vehicle speed can no longer be controlled by the steep hill descent function at this time, and the driver will take over and control the vehicle speed.

[0062] After adopting the above technical solution, for the existing electric logistics vehicles, after activating the steep slope descent function, if the driver needs to perform appropriate acceleration or deceleration, the acceleration can only be achieved by stepping on the accelerator pedal, and the deceleration can be achieved by stepping on the brake pedal. When the driver steps on the accelerator pedal or the brake pedal, the system will exit the steep slope descent function. If it is necessary to enter, it is necessary to re-operate to activate it. The present invention provides a system that can control the vehicle speed through acceleration and deceleration buttons. The activation button, acceleration button, and deceleration button of the system can be additionally added and integrated on the steering wheel, or the cruise control button can be reused in full, so as to realize the steep slope descent function without increasing the hardware cost. Using this system, the driver can easily activate and cancel the steep slope descent function, and appropriately increase and reduce the vehicle speed by operating the activation, acceleration, and deceleration buttons integrated on the steering wheel. The operation is very convenient and quick.

[0063] The working principle of the present invention is as follows:

[0064] 1. The driver manually activates the steep slope descent function. The steep slope descent function sends the corresponding negative torque or 0 torque to the motor control through the vehicle controller (VCU) to decelerate or accelerate control, instead of sending positive torque.

[0065] 2. The vehicle controller obtains the vehicle speed value at the moment the steep slope descent function is activated, and uses the vehicle speed value to control the target vehicle speed. At this time, the vehicle controller does not send positive torque to the motor controller (that is, the motor does not drive forward), but only sends negative torque or 0 torque. At this time, if the vehicle speed continues to decrease and is lower than 5km / h, the steep slope descent function is passively exited; if the vehicle speed is controlled within the target speed range by negative torque or 0 torque, the steep slope descent function is continued to be maintained to maintain the target speed range.

[0066] 3. When the driver operates the "speed increase button" or "speed decrease button", the target speed is increased or decreased accordingly. If the target speed is reduced, the negative torque is increased to reduce the speed to the target speed; if the target speed is increased, the negative torque is reduced to increase the speed to the target speed through the vehicle's own downhill gravity.

[0067] The present invention aims at the working condition that when the vehicle is traveling down a long steep slope, the driver needs to frequently step on the brake pedal to achieve deceleration. The present invention provides a control method for steep slope descent by introducing an energy recovery mechanism. When the vehicle speed reaches the value intended by the driver, the driver only needs to press an activation button to start the steep slope descent function, and the vehicle can travel at a constant speed at the set vehicle speed. This not only reduces the wear of the brake pads, heat, and personnel fatigue caused by frequent braking, but also helps to recycle downhill energy, thereby improving driving safety and energy efficiency.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steep slope descent control system for a pure electric logistics vehicle, comprising a combination button and a control module, characterized in that: The combination button includes an activation button, a cancel button, a speed increase button, and a speed decrease button. The control module includes a vehicle controller and a motor controller. The vehicle controller is interconnected with the motor controller. The vehicle controller is also electrically connected to the combination button. The vehicle controller is also connected to an instrument display module and a power battery system. The motor controller is electrically connected to the motor. The control module obtains the switch state of the button combination, caches the set speed for steep slope descent, obtains the current speed from the vehicle, obtains the brake pedal, the accelerator pedal, the gear position, and the power battery voltage, current, and SOC state. When the vehicle meets the following conditions, the driver presses the activation button to enter the steep slope descent mode; 1) The vehicle is in a drivable state; 2) The vehicle gear is in D gear; 3) The current vehicle speed is between 5 and 35 km / h; 4) Power battery SOC<97%; 5) The power battery has no fault alarm; 6) The vehicle has no faults that may affect the normal operation of the motor, motor controller, or power battery; When the vehicle enters the steep hill descent mode, the corresponding "steep hill descent" function indicator light is turned on on the instrument panel.

2. A method for controlling a steep slope descent of a pure electric logistics vehicle, applied to a control system for a steep slope descent of a pure electric logistics vehicle as claimed in claim 1, characterized in that: The vehicle speed control includes the following processes: The vehicle speed V1 obtained at the moment of activating the steep slope descent function is used as the currently set vehicle speed. When the vehicle speed increases due to the downhill gravity, the vehicle controller sends a negative torque command to the motor controller to enable the motor energy recovery mode, thereby generating electric braking force and controlling the vehicle speed at the set speed V1; On a downhill road, if you encounter a sharp turn or other road conditions that require further emergency deceleration, step on the brake pedal to reduce the vehicle speed to below the currently set speed. When the brake pedal is released, the vehicle will increase the speed to the speed value V1 set in the current steep slope descent mode through downhill gravity, and then continue to maintain the set speed value V1.

3. A steep slope descent control method for a pure electric logistics vehicle according to claim 2, characterized in that: When the vehicle needs to slow down in a non-emergency situation, it can be decelerated by pressing the speed reduction button. The specific strategy is that each time the speed reduction button is pressed, the vehicle speed is reduced by 1km / h.

4. A steep slope descent control method for a pure electric logistics vehicle according to claim 2, characterized in that: After the steep slope descent is completed, the steep slope descent function is exited. When the driver needs to increase the speed, he can accelerate by pressing the speed increase button. The specific strategy is that each time the speed increase button is pressed, the speed increases by 1km / h.

5. A steep slope descent control method for a pure electric logistics vehicle according to claim 4, characterized in that: The exit of the steep slope descent function is divided into two modes: active exit and passive exit.

6. A steep slope descent control method for a pure electric logistics vehicle according to claim 5, characterized in that: Active withdrawal includes the following conditions: 1) The driver actively presses the "Cancel" button to exit; 2) The vehicle gear is not in D gear; 3) The vehicle is under high and low voltage electricity; 4) The handbrake is pulled up; 5) Press the accelerator pedal.

7. A steep slope descent control method for a pure electric logistics vehicle according to claim 5, characterized in that: Passive withdrawal includes the following conditions: 1) The current actual vehicle speed is not within the range of 5 to 37 km / h; 2) The power battery reports a fault; 3) The motor controller or the vehicle reports a fault that affects the normal operation of the motor, motor controller, or power battery.

8. A steep slope descent control method for a pure electric logistics vehicle according to claim 4, characterized in that: When the hill descent control function is exited, the "hill descent control" function indicator light on the instrument panel will go out simultaneously.

9. A steep slope descent control method for a pure electric logistics vehicle according to claim 5, characterized in that: When the hill descent control function is passively exited, the vehicle will issue an alarm tone and simultaneously display the corresponding alarm message on the instrument panel to remind the driver that the vehicle speed can no longer be controlled by the hill descent control function at this time, and the driver will take over and control the vehicle speed.

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