Control method and system for automatic picking and hanging of power takeoff of parking operation vehicle

Abstract

The invention provides a control method and system for automatic picking and hanging of a power takeoff of a parking operation vehicle, a vehicle control unit monitors the running state of the vehicle by collecting signals and receiving signals sent by an operation system controller, and when a power takeoff starting signal sent by the operation system controller is received, the vehicle is started to start the power takeoff. The vehicle control unit detects whether the collected signals meet the preset conditions or not, if yes, the power takeoff is controlled to be automatically engaged with the gear, and if any condition is not met, the power takeoff is controlled to be automatically disengaged from the gear, automatic gear engagement and disengagement of the power takeoff are achieved, misoperation caused by manual operation is avoided, the operation convenience is high, and the power takeoff is controlled to be automatically disengaged from the gear. And even if the parking meets the preset condition, the gear cannot be automatically engaged, and the gear is engaged only when the parking demand exists, so that unnecessary energy consumption is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular relates to a control method and system for automatically attaching and detaching a power take-off of a parking operation vehicle. Background Art

[0002] For vehicles that use the power take-off of new energy transmissions for parking operations, the operation process is generally that the power take-off must be turned off before driving, and the power take-off must be re-engaged during parking operations. Therefore, the driver needs to manually turn off the power take-off switch on the operation system operation panel before driving, and manually turn on the power take-off switch on the operation system operation panel before parking operations. For vehicles that need to frequently switch between driving and parking operations, the operation convenience is low, and manual misoperation is prone to occur. The main reason is that in the new energy transmission system, when the power take-off is in gear, the failure rate of gear shifting during driving load speed regulation is high, and as the driving speed increases, the rotation speed of the power take-off increases accordingly, and the mechanical oil pump and other devices it carries are prone to exceed their working speed and cause damage. At the same time, because the new energy transmission usually relies on the reversal of the motor to achieve reverse gear, there is no special reverse gear, and the rotation direction of the power take-off corresponds to the rotation direction of the motor, so when reversing, the reversal of the mechanical oil pump and other devices it carries will also cause damage to the one-way pump and other devices.

[0003] Patent application number 201910906500.4 discloses a transmission power take-off system for pure electric vehicles and its control method. When the vehicle is parked and power is taken off, the power take-off control switch needs to be pressed manually. The TCU determines whether the vehicle is stationary and then controls the power take-off to shift into gear. Manual operation is prone to error. When the vehicle stops and meets the preset conditions, if the power take-off control switch is accidentally touched, the TCU will control the power take-off to shift into gear and enter the power take-off mode. Energy consumption will be lost when the vehicle does not need to take power, and the manual control operation is inconvenient.

[0004] To this end, the technical problem to be solved by the present invention is: the prior art uses a manual method for shifting gears and disengaging gears of the power take-off, which is prone to manual misoperation and has low operational convenience; if the vehicle stops and meets the preset conditions, and the power take-off control switch is accidentally touched, the TCU will control the power take-off to shift gears and enter the power take-off mode, which will generate unnecessary energy consumption when the vehicle does not need to take power. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a control method and system for automatically detaching and attaching a power take-off of a parking operation vehicle.

[0006] The specific plan is as follows: A control method for automatically attaching and detaching a power take-off of a parking vehicle comprises the following steps: Step 1: The vehicle controller VCU monitors the running status of the vehicle, and sends the gear position signal and speed signal of the vehicle to the operating system controller, and at the same time receives the power take-off switch signal and target working speed signal sent by the operating system controller; Step 2: When receiving the power take-off start signal, the vehicle controller VCU determines whether the preset conditions are met; Step 3: If the preset conditions are met, the vehicle controller VCU controls the power take-off to automatically engage the gear. If any of the conditions are not met, the vehicle controller VCU controls the power take-off to automatically disengage the gear.

[0007] When the vehicle switches from driving state to parking state and the handbrake is pulled, the target working speed remains at zero before the operating system controller sends the target working speed signal, and the power take-off of the vehicle controller VCU controller automatically disengages the gear; When the vehicle switches from driving state to parking state and the handbrake is pulled, after the operating system controller sends the target operating speed signal, the vehicle controller VCU controls the power take-off to shift gears and responds to the speed demand; When the vehicle completes the first parking operation, it enters the idle mode.

[0008] The preset conditions in step 2 are that the vehicle high voltage is powered on, the vehicle gear is in neutral N, the handbrake signal is valid, the vehicle speed is 0, the operating system controller sends a power take-off switch "on" signal, and the operating system controller sends a request target speed that is not 0.

[0009] When the vehicle enters the idle mode, the idle mode duration is counted. When it exceeds the set value, the vehicle controller VCU controls the power take-off to disengage the gear to avoid ineffective long-term energy loss and noise. Within the set value, after receiving the target operating speed signal sent by the operating system controller again, the vehicle controller VCU controls the power take-off to respond to the speed demand and perform the second parking operation.

[0010] A control system for automatically unhooking a power take-off of a parking operation vehicle comprises a motor, an output shaft of the motor is connected to a gearbox, the output of the gearbox is connected to the power take-off, a motor speed sensor is provided on the motor, and a speed sensor is provided on the gearbox, the motor speed sensor and the speed sensor are respectively electrically connected to a vehicle controller VCU, the vehicle controller VCU exchanges data with an operation system controller via a CAN network; the vehicle controller VCU is electrically connected to a shift handle and a handbrake, and the vehicle controller VCU controls the action of the power take-off according to collected signals.

[0011] The operating system controller sends a power take-off switch signal and requests a target speed to the vehicle controller VCU.

[0012] The beneficial effects of the present invention are: The present invention provides a control method and system for automatically engaging and disengaging a power take-off of a parking operation vehicle. The whole vehicle controller monitors the operating status of the vehicle by collecting signals and receiving signals sent by an operation system controller. After receiving a power take-off start signal sent by the operation system controller, the whole vehicle controller detects whether the collected signal meets a preset condition. If so, the power take-off is controlled to automatically engage in gear. If any condition is not met, the power take-off is controlled to automatically disengage in gear. Automatic engagement and disengagement of the power take-off is achieved, and manual operation is avoided. The operation is convenient. Even if the preset conditions are met during parking, the gear will not be engaged automatically. The gear will be engaged only when there is a parking demand, thereby avoiding unnecessary energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flow chart of the prior art.

[0014] Figure 2 It is a flow chart of the present invention.

[0015] Figure 3 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the implementation of the present invention, not all of the implementations. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 As shown, in the prior art, a power take-off switch is manually opened and closed to achieve shifting and shifting of the power take-off.

[0018] like Figure 2 and Figure 3 As shown, the present invention does not require manual control and can automatically shift or engage the gear of the transmission power take-off according to the vehicle's operating status. When the vehicle needs to drive, after the vehicle shifts from neutral gear N to forward gear D or reverse gear R, the control system automatically shifts the gear and disengages the power take-off; when the vehicle stops and shifts the vehicle into neutral gear N, after a series of judgment conditions are met, the power take-off is automatically engaged to achieve parking operations.

[0019] The present invention is aimed at the automatic gear shifting and disengaging of a transmission power take-off for pure electric vehicles, wherein a vehicle controller VCU exchanges data with an operating system controller via a CAN network; the vehicle controller VCU determines whether preset conditions are met by collecting relevant signals and receiving signals sent by the operating system controller, and if so, controls the power take-off to automatically shift gears; if any condition is not met, controls the power take-off to automatically shift gears, thereby realizing automatic gear shifting and disengaging of the power take-off, avoiding manual operation errors, and being highly convenient to operate.

[0020] The present invention provides a control method for automatically attaching and detaching a power take-off of a parking operation vehicle, which specifically comprises the following steps: Step 1: The vehicle controller VCU monitors the running status of the vehicle, and sends the gear position signal and speed signal of the vehicle to the operating system controller, and at the same time receives the power take-off switch signal and target working speed signal sent by the operating system controller; Step 2: When receiving the power take-off start signal, the vehicle controller VCU determines whether the preset conditions are met; Step 3: If the preset conditions are met, the vehicle controller VCU controls the power take-off to automatically engage the gear. If any of the conditions are not met, the vehicle controller VCU controls the power take-off to automatically disengage the gear.

[0021] In the step one, the gear position signal of the vehicle is transmitted to the vehicle controller VCU by the electrical signal generated when the shift handle is working, and the vehicle speed signal is obtained by calculation; in the present invention, the power take-off switch signal is always kept in the on state, when the operating system controller sends a power take-off start signal and requests a target working speed signal to the vehicle controller VCU, the vehicle controller VCU controls the power take-off to shift into gear, wherein the target working speed refers to the working speed of the power take-off, which is determined according to the actual application scenario or the load carried by the vehicle.

[0022] The preset conditions in step 2 are: the vehicle high voltage is powered on, the vehicle gear is in neutral N, the handbrake signal is valid, the vehicle speed is 0, the operating system controller sends a power take-off switch "on" signal, and the operating system controller sends a request target speed that is not 0; after the vehicle controller VCU detects that the above signals are all valid, the power take-off is engaged. If any of the above conditions is not met, the vehicle controller VCU controls the power take-off to disengage the gear, thereby decoupling the operation of the driving and power take-off. The present invention can realize automatic disengagement and engagement of the power take-off, without the driver actively operating the "power take-off switch" button on the operating system control panel. The present invention keeps the "power take-off switch" signal valid continuously, and automatically identifies and matches the driving power take-off and parking power take-off.

[0023] In the present invention, when the vehicle is switched from the driving state to the parking state and the handbrake is pulled, before the operating system controller sends the target operating speed signal, the target operating speed remains at zero, and the vehicle controller VCU controls the power take-off to automatically shift gears; when the vehicle is switched from the driving state to the parking state and the handbrake is pulled, after the operating system controller sends the target operating speed signal, the vehicle controller VCU controls the power take-off to shift gears and respond to the speed demand; when the vehicle completes the first parking operation, it enters the idle mode.

[0024] After the new energy vehicles in the industry put the power take-off into gear, generally in order to reduce the time required for the power take-off to rise in working speed, it is often set to automatically enter an idle mode with a certain speed after the power take-off is put into gear. If there is no working demand, unnecessary energy loss and noise will be generated. For this reason, in the present invention, the power take-off is disengaged during driving. In order to avoid the power take-off automatically putting into gear and entering the idle mode after the gear-up conditions are met after parking, which generates unnecessary energy loss and noise, it is set that when the driving is switched to parking and the handbrake is pulled, before the operation system controller action button is operated, that is, before the operation system controller sends the request target working speed to the vehicle controller VCU, the target working speed continues to be 0, so as to avoid the power take-off automatically putting into gear when there is no working demand; after the operation system controller action button is operated for the first time after parking, that is, after the operation system controller sends the corresponding target working speed to the vehicle controller VCU, the vehicle controller VCU controls the power take-off to put into gear and responds to the speed demand.

[0025] The present invention also provides a self-identification cancellation function in idle mode of the power take-off. When the vehicle enters the idle mode, the duration of the idle mode is counted. When it exceeds the set value, the vehicle controller VCU controls the power take-off to avoid invalid long-term energy loss and noise; within the set value, after receiving the target working speed signal sent by the operating system controller again, the vehicle controller VCU controls the power take-off to respond to the speed demand and perform the second parking operation. After the first operation action of each parking is completed, the operating system controller keeps sending the idle speed and shall not return the target speed to 0, so as to avoid the vehicle controller VCU controlling the power take-off to disengage, and can keep the power take-off running at a low speed.

[0026] The present invention provides a control system for automatically unhooking and hooking a power take-off of a parking operation vehicle, comprising a motor, an output shaft of the motor being connected to a gearbox, the output of the gearbox being connected to the power take-off, a motor speed sensor being arranged on the motor, and a speed sensor being arranged on the gearbox, the motor speed sensor and the speed sensor being electrically connected to a vehicle controller VCU respectively, the vehicle controller VCU performing data exchange with an operation system controller via a CAN network; the vehicle controller VCU being electrically connected to a shift handle and a handbrake, and the vehicle controller VCU controlling the action of the power take-off according to collected signals.

[0027] The vehicle controller VCU can be connected to the shift handle and handbrake through hard wires. The vehicle controller VCU controls the power take-off action according to the electrical signals generated when the shift handle and handbrake are working.

[0028] The gear shifting of the power take-off is enabled by the built-in cylinder, and the air intake of the cylinder is controlled by the power take-off air intake solenoid valve. The power take-off air intake solenoid valve is electrically connected to the vehicle controller VCU, and the opening and closing of the power take-off air intake solenoid valve is controlled by the enable signal sent by the vehicle controller VCU.

[0029] The operating system controller sends a power take-off switch signal and requests a target speed to the vehicle controller VCU.

[0030] The vehicle controller VCU collects gear position signals, handbrake signals, vehicle speed signals, power take-off switch signals, and target speed request signals. The present invention is provided with a motor speed sensor and a speed sensor, which can measure the motor speed and the gearbox speed in real time, and calculate the vehicle speed accordingly. The vehicle speed calculation process is prior art and will not be described in detail.

[0031] The specific working process of the present invention is: The vehicle controller VCU detects whether the above signals meet the valid conditions through the collected signals and the signals sent by the operating system controller, that is, the vehicle high voltage is powered on, the vehicle gear is in neutral N, the handbrake signal is valid, the vehicle speed is 0, the operating system controller sends the power take-off switch "on" signal, and the operating system controller sends the request target speed is not 0. If so, the vehicle controller VCU controls the power take-off to engage the gear. If any condition is not met, the vehicle controller VCU controls the power take-off to disengage the gear.

[0032] When the vehicle has no parking requirement, when the vehicle switches from driving state to parking state and the handbrake is pulled, the target operating speed remains at zero, and the power take-off of the vehicle controller VCU controller automatically disengages the gear to avoid unnecessary energy loss and noise.

[0033] When the vehicle needs to park, after the vehicle switches from driving state to parking state and pulls the handbrake, the operation system controller sends the target working speed signal to the vehicle controller VCU, and the vehicle controller VCU controls the power take-off to shift gears and responds to the speed demand to perform parking operations; After the first parking operation of the vehicle is completed, the vehicle enters the idle mode and counts the duration of the idle mode. When it exceeds the set value, the vehicle controller VCU controls the power take-off to disengage the gear to avoid ineffective long-term energy loss and noise; if it is before the set value, the operating system controller sends the target operating speed signal to the vehicle controller VCU, and the vehicle controller VCU controls the power take-off to respond to the speed demand and perform the second parking operation, and so on.

[0034] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A control method for automatically attaching or detaching a power take-off device of a parking vehicle, characterized in that: The specific steps include: Step 1: The vehicle controller VCU monitors the running status of the vehicle, and sends the gear position signal and speed signal of the vehicle to the operating system controller, and at the same time receives the power take-off switch signal and target working speed signal sent by the operating system controller; Step 2: When receiving the power take-off start signal, the vehicle controller VCU determines whether the preset conditions are met; Step 3: If the preset conditions are met, the vehicle controller VCU controls the power take-off to automatically engage the gear. If any of the conditions are not met, the vehicle controller VCU controls the power take-off to automatically disengage the gear.

2. The control method for automatically attaching and detaching a power take-off device of a parking operation vehicle according to claim 1, characterized in that: When the vehicle switches from driving state to parking state and the handbrake is pulled, the target working speed remains at zero before the operating system controller sends the target working speed signal, and the power take-off of the vehicle controller VCU controller automatically disengages the gear; When the vehicle switches from driving state to parking state and the handbrake is pulled, after the operating system controller sends the target operating speed signal, the vehicle controller VCU controls the power take-off to shift gears and responds to the speed demand; When the vehicle completes the first parking operation, it enters the idle mode.

3. The control method for automatically attaching and detaching a power take-off device of a parking operation vehicle according to claim 1, characterized in that: The preset conditions in step 2 are that the vehicle high voltage is powered on, the vehicle gear is in neutral N, the handbrake signal is valid, the vehicle speed is 0, the operating system controller sends a power take-off switch "on" signal, and the operating system controller sends a request target speed that is not 0.

4. The control method for automatically attaching and detaching a power take-off device of a parking operation vehicle according to claim 2, characterized in that: When the vehicle enters the idle mode, the idle mode duration is counted. When it exceeds the set value, the vehicle controller VCU controls the power take-off to disengage the gear to avoid ineffective long-term energy loss and noise. Within the set value, after receiving the target operating speed signal sent by the operating system controller again, the vehicle controller VCU controls the power take-off to respond to the speed demand and perform the second parking operation.

5. A control system for automatically attaching and detaching a power take-off of a parking operation vehicle, using the control method for automatically attaching and detaching a power take-off of a parking operation vehicle according to any one of claims 1 to 4, characterized in that: It includes a motor, the output shaft of the motor is connected to a gearbox, the output of the gearbox is connected to a power take-off, and a motor speed sensor is provided on the motor, and a speed sensor is provided on the gearbox. The motor speed sensor and the speed sensor are electrically connected to a vehicle controller VCU respectively, and the vehicle controller VCU exchanges data with the operating system controller through a CAN network; the vehicle controller VCU is electrically connected to a shift handle and a handbrake, and the vehicle controller VCU controls the action of the power take-off according to the collected signals.

6. The control method for automatically attaching and detaching a power take-off device of a parking operation vehicle according to claim 5, characterized in that: The operating system controller sends a power take-off switch signal and requests a target speed to the vehicle controller VCU.

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