An electrically powered vehicle

Abstract

The application discloses an electric transport vehicle, which comprises an operation unit, a control unit and a power unit, wherein the operation unit comprises a speed operation unit and a direction operation unit, the speed operation unit is used for inputting a speed instruction, and the direction operation unit is used for inputting a direction instruction; the control unit sends corresponding walking instructions according to the speed instruction and the direction instruction; the power unit executes the walking instructions; wherein when the control unit receives a change in the direction instruction within a predetermined time, the control unit further detects whether the operation unit completes a specified action, after detecting that the operation unit completes the specified action, the control unit sends corresponding walking instructions to the power unit according to the latest direction instruction, otherwise, the control unit sends a parking instruction. The application can avoid the danger caused by the change of the walking direction of the electric transport vehicle due to the multiple misoperations of the operator during the driving process, and improves the driving safety of the electric transport vehicle.

Description

Technical Field

[0001] This invention relates to an electric transport vehicle, and more specifically to an electric transport vehicle capable of preventing misoperation. Background Technology

[0002] Electric transport vehicles are freight vehicles that use electricity for transportation operations. Currently, transport vehicles can be categorized by power source into fuel-powered transport vehicles and battery- and motor-powered electric transport vehicles. The latter are superior to the former in terms of economy, operational comfort, noise reduction, and environmental friendliness, thus their application has become increasingly widespread in recent years. However, existing transport vehicles may respond too quickly when performing forward or reverse operations, immediately shifting to the new direction after the operator changes direction. This can easily pose a danger to the operator, especially if the direction control button is accidentally pressed.

[0003] Therefore, Chinese patent document CN1026789098B discloses a gear position recognition system for preventing accidental operation in electric vehicles, including a gear shifting device, a gear position signal recognition device, an MCU, a drive motor, and a reducer; the gear shifting device is connected to the gear position signal recognition device, the gear position signal recognition device is connected to the MCU via a CAN bus, and the MCU controls the drive motor to operate; the drive motor is connected to the reducer. This invention also provides a gear position recognition method for preventing accidental operation in electric vehicles. This method ensures that if the driver accidentally operates the gear position during vehicle operation, the vehicle will still move in the direction the driver intended, preventing sudden deceleration and potential accidents. In this prior art, driver error is prevented by determining whether the gear position is valid; if the gear position signal is deemed invalid, the corresponding gear shifting operation is not performed.

[0004] Chinese patent document 104149788B discloses a method for preventing driver misoperation in electric vehicles. This method involves conditionally recognizing the ignition key and gear shift signals within the vehicle control strategy. Upon initial power-up, the electric vehicle sequentially performs initialization, fault detection, ignition detection, and high-voltage power-on; subsequently, gear position detection is performed, and each gear position subroutine is entered. During the operation of each gear position submodule, the program sends motor control commands to control the motor normally and disables the gear position and key signals. Only when the driver depresses the brake pedal, causing the motor torque to reach 0 Nm, does the subroutine exit and return to the main program to perform key and gear position detection. This invention overcomes the technical problem that during electric vehicle operation, improper driver operation of the ignition key / gear shift mechanism, which the control system fails to recognize, leads to changes in motor state and consequently, drastic changes in the overall vehicle state, endangering passenger safety. In contrast, this prior art combines the ignition key and gear shift signals and selects the effective signal to control the vehicle to perform corresponding actions.

[0005] In the aforementioned existing technologies, operator error is avoided by determining whether the corresponding control signal is valid. However, in the actual operation of electric transport vehicles, there are also dangerous driving situations that may occur under normal operation, which can also pose a danger to the operator. Summary of the Invention

[0006] This invention provides an electric transport vehicle that can prevent operator misoperation, including an operating unit. The operating unit includes a speed operating unit and a direction operating unit. The speed operating unit is used to input speed commands, and the direction operating unit is used to input direction commands. The control unit sends corresponding walking commands based on speed and direction commands; The power unit executes walking commands; When the control unit receives a change in direction command within a predetermined time, the control unit controls the power unit to perform a speed reduction or parking action, and continuously monitors whether the operating unit has completed the prescribed action. After detecting that the power unit has completed the speed reduction or parking action and the operating unit has completed the prescribed action, the control unit sends the corresponding travel command to the power unit according to the latest direction command; otherwise, the control unit sends a parking command.

[0007] Note: The walking directions in this plan include both forward and backward movement.

[0008] Compared with existing technologies, in this solution, when the control unit receives a change in direction command within a predetermined time, it also controls the power unit to perform a speed reduction or parking action, and continuously monitors whether the operating unit completes the prescribed actions. This distinguishes whether the direction command operation is a normal operation by the operator or an error by the operator. If the power unit completes the speed reduction or parking action and the operating unit completes the prescribed actions, it indicates that the current operation is a normal operation by the operator. At this time, the control unit controls the walking unit to execute the corresponding walking command. Otherwise, it indicates that the current operation is an error by the operator. At this time, the control unit sends a parking command. This can avoid the danger caused by the operator repeatedly changing the direction of travel due to misoperation during the operation of the electric transport vehicle, and improve the driving safety of the electric transport vehicle.

[0009] Preferably, when the control unit receives multiple directional commands within a predetermined time, and detects that the speed operation unit has performed a zeroing operation and adjusted the speed to a newly set speed, it determines that the operation unit has completed the prescribed action. In this solution, when the speed operation unit is detected to have performed a zeroing operation and adjusted the speed to a newly set speed, it is determined that the previous multiple directional commands were normal operations by the operator. Only then does the control unit control the walking unit to execute the corresponding walking commands. This avoids the danger caused by the operator repeatedly changing the direction of travel due to misoperation during the operation of the electric transport vehicle, thus improving the driving safety of the electric transport vehicle.

[0010] Preferably, the operating unit further includes a start / stop switch that can be positioned in either the parking or driving position. When the control unit receives multiple directional commands within a predetermined time, and detects that the start / stop switch has been placed in the parking position and then in the driving position, it determines that the operating unit has completed the prescribed action. In this solution, the use of a start / stop switch to detect misoperation further improves the driving safety of the electric transport vehicle.

[0011] Preferably, the system also includes a braking unit. Before detecting whether the operating unit has completed the prescribed action, the control unit sends a stop command to the power unit and / or a braking command to the braking unit. Upon receiving the braking command, the braking unit brakes the power unit. In this solution, the braking unit improves the safety of reversing operations, thereby further ensuring the safe driving of the electric transport vehicle.

[0012] Preferably, when the control unit detects that the direction of travel of the previous instruction is different from the direction of travel of the latest instruction, the control unit sends a stop instruction to the power unit, and when it detects that the speed of the power unit is zero or close to zero, it sends a braking instruction to the braking unit. After the braking unit completes braking, the control unit releases the braking state of the braking unit and controls the power unit to execute the latest instruction. In this scheme, the reversing operation is performed after braking is completed, which further ensures the safe driving of the electric transport vehicle.

[0013] Preferably, when the control unit detects that the direction of travel of the previous instruction is the same as the direction of travel of the latest instruction, the control unit detects the opening degree of the speed operation unit and the current speed of the power unit, and controls the power unit to match the opening degree of the speed operation unit. This solution can prevent jerking and further ensure the safe driving of the electric transport vehicle.

[0014] Preferably, when the opening degree of the operating unit is detected to be greater than the current speed of the power unit, the control unit increases the speed of the power unit to match the speed of the operating unit; when the opening degree of the operating unit is detected to be less than the current speed of the power unit, the control unit decreases the speed of the power unit to match the speed of the operating unit. This solution can prevent jerking and further ensure the safe driving of the electric transport vehicle.

[0015] The present invention has the following beneficial effects: 1. This invention can distinguish whether multiple directional commands are normal operations or erroneous operations by the operator. If the operation unit is detected to have completed the prescribed action, it indicates that the current operation is a normal operation by the operator. At this time, the control unit controls the walking unit to execute the corresponding walking command. Otherwise, it indicates that the current operation is an erroneous operation by the operator. At this time, the control unit sends a parking command, thereby avoiding the danger caused by the operator repeatedly changing the direction of travel due to erroneous operations during the operation of the electric transport vehicle, and improving the driving safety of the electric transport vehicle.

[0016] 2. This invention can improve the safety of reversing operations, thereby further ensuring the safe driving of electric transport vehicles.

[0017] 3. This invention can prevent jerking, further ensuring the safe driving of electric transport vehicles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of an electric transport vehicle according to the present invention. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method: 1. Definition Parking instruction: refers to the operation instruction that keeps the electric transport vehicle in a parked state.

[0020] Parking: refers to the state in which an electric transport vehicle stops moving and is fixed in one position.

[0021] Braking: refers to the action of stopping or reducing the speed of an electric transport vehicle in operation.

[0022] 2. The basic implementation method is as shown in the attached figure. Figure 1 As shown: An electric transport vehicle includes an energy storage unit that provides electrical energy to the electric transport vehicle; The operation unit includes a speed operation unit and a direction operation unit. The speed operation unit is used to input speed commands, and the direction operation unit is used to input direction commands. The control unit sends corresponding walking commands based on speed and direction commands; The power unit executes walking commands; The braking unit executes braking commands; And the rest of the vehicle's structural components.

[0023] When the control unit receives a change in direction command within a predetermined time, it sends a stop command to the power unit and / or a braking command to the braking unit. Upon receiving the braking command, the braking unit brakes the power unit, and the power unit performs a speed reduction to zero or a parking action. Then, the control unit checks whether the operating unit has completed the prescribed action. If the control unit detects that the power unit has completed the speed reduction to zero or the parking action and the operating unit has completed the prescribed action, the control unit sends a corresponding travel command to the power unit according to the latest direction command. Otherwise, the control unit sends a parking command.

[0024] When the control unit detects that the direction of travel of the previous command is different from the direction of travel of the latest command, the control unit sends a stop command to the power unit. When it detects that the speed of the power unit is zero, it sends a braking command to the braking unit. After the braking unit completes braking, the control unit releases the braking state of the braking unit and controls the power unit to execute the latest command.

[0025] When the control unit detects that the direction of travel of the previous command is the same as the direction of travel of the latest command, the control unit detects the opening degree of the speed operation unit and the current speed of the power unit, and controls the power unit to match the opening degree of the speed operation unit. Specifically, when it detects that the opening degree of the operation unit is greater than the current speed of the power unit, the control unit increases the speed of the power unit to a speed that matches the operation unit; when it detects that the opening degree of the operation unit is less than the current speed of the power unit, the control unit decreases the speed of the power unit to a speed that matches the operation unit.

[0026] In the above process, when detecting whether the operating unit has completed the prescribed action, if the speed operating unit is detected to have performed a zeroing operation and adjusted the speed to the newly set speed, it is determined that the operating unit has completed the prescribed action. The speed operating unit is a finger-operated speed controller that automatically performs a zeroing operation after the operator removes the operating force.

[0027] Example 2 Unlike Embodiment 1, in this embodiment, the operating unit further includes a start-stop switch that can be positioned in either the parking or driving position. When the control unit receives multiple directional commands within a predetermined time, and detects that the start-stop switch has been positioned in the parking position and then in the driving position, it determines that the operating unit has completed the prescribed action. In this embodiment, the speed operating unit does not perform an automatic zeroing operation and can stop at any speed value. However, the operating unit is additionally equipped with a start-stop handle that can be positioned in either the parking or driving position. When the start-stop handle is released, the vehicle is in the parking position; when the start-stop handle is pinched, the vehicle is in the driving position. When the start-stop handle is first released and then pinched again, the control unit sends a corresponding driving command to the power unit according to the latest directional command.

[0028] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An electric transport vehicle, comprising an operating unit, the operating unit including a speed operating unit and a direction operating unit, the speed operating unit being used to input speed commands, and the direction operating unit being used to input direction commands; The control unit sends corresponding walking commands based on the speed and direction commands. The power unit executes the walking command; The feature is that when the control unit receives a change in direction command within a predetermined time, the control unit controls the power unit to perform a speed reduction or parking action, and continuously detects whether the operating unit has completed the prescribed action. After detecting that the power unit has completed the speed reduction or parking action and the operating unit has completed the prescribed action, the control unit sends a corresponding travel command to the power unit according to the latest direction command; otherwise, the control unit sends a parking command.

2. The electric transport vehicle according to claim 1, characterized in that: When the control unit receives multiple direction commands within a predetermined time, and detects that the speed operation unit performs a zeroing operation and adjusts the speed to a newly set speed, it determines that the operation unit has completed the prescribed action.

3. The electric transport vehicle according to claim 1, characterized in that: The operating unit also includes a start / stop switch that can be placed in the parking position or the driving position. When the control unit receives multiple directional commands within a predetermined time, and detects that the start / stop switch is placed in the parking position and then in the driving position, it determines that the operating unit has completed the prescribed action.

4. The electric transport vehicle according to any one of claims 1-3, characterized in that: It also includes a braking unit, wherein the control unit sends a stop command to the power unit and / or a braking command to the braking unit before detecting whether the operation unit has completed the prescribed action, and the braking unit brakes the power unit when it receives the braking command.

5. The electric transport vehicle according to claim 4, characterized in that: When the control unit detects that the direction of travel of the previous instruction is different from the direction of travel of the latest instruction, the control unit sends a stop instruction to the power unit. When the control unit detects that the speed of the power unit is zero or close to zero, it sends a braking instruction to the braking unit. After the braking unit completes braking, the control unit releases the braking state of the braking unit and controls the power unit to execute the latest instruction.

6. The electric transport vehicle according to claim 5, characterized in that: When the control unit detects that the direction of travel of the previous instruction is the same as the direction of travel of the latest instruction, the control unit detects the opening degree of the speed operation unit and the current speed of the power unit, and controls the power unit to match the opening degree of the speed operation unit.

7. The electric transport vehicle according to claim 6, characterized in that: When the control unit detects that the opening degree of the operating unit is greater than the current speed of the power unit, the control unit increases the speed of the power unit to a speed that matches the operating unit. When the control unit detects that the opening degree of the operating unit is less than the current speed of the power unit, the control unit decreases the speed of the power unit to a speed that matches the operating unit.

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