Vehicle power take-off control method and device

Abstract

The invention discloses a vehicle power take-off control method and device in the technical field of vehicles, and the method comprises the steps: controlling a VCU to adjust a power take-off rotation speed based on a power take-off rotation speed obtained by a previous input signal under a power take-off activation state based on an input accelerator pedal opening and closing signal or a power take-off increase and decrease signal until the current power take-off rotation speed reaches a target rotation speed; wherein the last input signal is an accelerator pedal opening and closing signal input in the last power takeoff rotating speed adjusting stage or a power takeoff increasing and decreasing signal input in the last power takeoff rotating speed adjusting stage. The technical problem that in the prior art, due to the fact that a user mistakenly estimates the loading capacity of a power take-off port, an internal gear of the power take-off port is damaged, and the use experience is affected can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicles and relates to a vehicle power take-off control method and device. Background Art

[0002] As the use scenarios of commercial vehicles become more diverse and complex, power take-offs are widely used in vehicles to meet the operational needs of the vehicle's mounted equipment. Their function is to obtain power from the vehicle's power system and transmit it to other mounted equipment. As a power source for the mounted equipment, this technology is commonly used in loaders, mixer trucks and other operating vehicles.

[0003] However, since users may incorrectly estimate the load capacity of the power take-off port during actual use, overloading may cause damage to the internal gears of the power take-off port, affecting the user experience. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a vehicle power take-off control method and device, which can solve the technical problem in the prior art that the internal gears of the power take-off port are damaged due to the user's incorrect estimation of the load capacity of the power take-off port, thereby affecting the user experience.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a vehicle power take-off control method, comprising: In the power take-off activation state, based on the input accelerator pedal on / off signal or power take-off increase / decrease signal, the VCU is controlled to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal until the current power take-off speed reaches the target speed; The previous input signal is an accelerator pedal opening and closing signal input in the previous power take-off speed adjustment stage or a power take-off increase or decrease signal input in the previous power take-off speed adjustment stage.

[0006] Furthermore, the method further comprises: Obtaining working condition information, and determining whether to enter or exit the power take-off standby state according to the working condition information: When all power taking entry conditions are met, entering the power taking standby state; When any power take-off exit condition is met, exit the power take-off standby state; The power take-off entry conditions include: the vehicle has been connected to high voltage, the handbrake has been pulled, the power take-off switch has been pressed, and the gear is in the parking gear; the power take-off exit conditions include: the power take-off switch has been turned off, the vehicle has been cut off from high voltage, there is a power take-off fault, and the physical vehicle speed is greater than the vehicle speed calibration value; In response to the accelerator pedal opening and closing signal being collected for the first time, the power take-off standby state is converted into a power take-off activation state.

[0007] Furthermore, after exiting the power take-off standby state, the power take-off speed is reset to zero.

[0008] Furthermore, after entering the power take-off standby state, in response to the first acquisition of the accelerator pedal opening and closing signal, the VCU is controlled to adjust the power take-off speed based on a preset idle speed.

[0009] Further, based on the input accelerator pedal on / off signal, controlling the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal includes: When the opening and closing degree of the accelerator pedal opening and closing signal is 0%-30%, the current power take-off speed is adjusted to IntRpm; When the opening and closing degree of the accelerator pedal opening and closing signal is 30%-50%, the current power take-off speed is adjusted to IntRpm+Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 50%-80%, the current power take-off speed is adjusted to IntRpm+2Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 80%-100%, the current power take-off speed is adjusted to MaxRpm; Among them, the IntRpm is the power take-off speed obtained from the previous input signal. When the IntRpm is the collected accelerator pedal opening and closing signal, the IntRpm is the idle speed, Grad is the calibration value, and MaxRpm is the maximum power take-off speed.

[0010] Further, based on the input power take-off increase / decrease signal, controlling the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal includes: When the input is a power take-off reduction signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm-DecGrad; When the input is a power take-off reduction signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm-4(T-t+1)DecGrad until the power take-off speed is 0; When the input is a power take-off increase signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm+IncGrad; When the input is a power take-off increase signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm+4(T-t+1)IncGrad until the requested speed reaches MaxRpm; Among them, AppRpm is the power take-off speed obtained from the previous input signal, DecGrad is the calibrated decreasing gradient, T is the duration of the power take-off signal, Inclad is the calibrated increasing gradient, and MaxRpm is the maximum power take-off speed.

[0011] Furthermore, it also includes: During the power taking process, the TCU is controlled to feedback the power taking status to the VCU. When the TCU feedback power taking status is that no power is taken, the VCU is controlled to send a power taking fault signal to the CAN network. The CAN network is controlled to send the power taking fault signal to the display device and prompt.

[0012] Furthermore, it also includes: During the power taking process, the VCU is controlled to obtain the maximum torque signal of the power taking fed back by the TCU, and the motor power is calculated based on the real-time collected power taking speed and the maximum torque signal of the power taking, so as to limit the motor power to not exceed the preset output motor power threshold.

[0013] In a second aspect, the present invention provides a vehicle power take-off control device, comprising: The pedal speed control module is used to control the VCU to adjust the current power take-off speed based on the input accelerator pedal opening and closing signal when the power take-off is activated; The key speed control module is used to control the VCU to adjust the current power take-off speed based on the input power take-off increase or decrease signal when the power take-off is activated; The VCU is used to respond to the control of the pedal speed control module and / or the key speed control module, and adjust the current power take-off speed based on the power take-off speed obtained by the previous input signal until the current power take-off speed reaches the target speed; The previous input signal is an accelerator pedal opening and closing signal input in the previous power take-off speed adjustment stage or a power take-off increase or decrease signal input in the previous power take-off speed adjustment stage.

[0014] Furthermore, it also includes: A power take-off initialization module is used to control the VCU to adjust the power take-off speed based on a preset idle speed in response to the first acquisition of an accelerator pedal opening and closing signal after entering the power take-off standby state; The diagnosis and protection module is used to control the TCU to feedback the power taking state to the VCU during the power taking process, and when the power taking state fed back by the TCU is no power taking, control the VCU to send a power taking fault signal to the CAN network, and control the CAN network to send the power taking fault signal to the display device and prompt; The VCU is controlled to obtain the maximum torque signal of the power take-off fed back by the TCU, and the motor power is calculated based on the power take-off speed and the maximum torque signal collected in real time, so as to limit the motor power to not exceed a preset output motor power threshold.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the PTO standby state, based on the input accelerator pedal on / off signal or PTO increase / decrease signal, the VCU is controlled to adjust the PTO speed based on the PTO speed obtained by the previous input signal until the current PTO speed reaches the target speed, thus achieving accurate adjustment of the PTO speed, reducing the risk of users misestimating the load capacity of the PTO port, further protecting the internal gears of the PTO port from damage, and improving the user experience; Among them, the VCU disclosed in the present application adjusts the current power take-off speed based on the power take-off speed obtained by the previous input signal through the dual-source fusion power take-off control of the pedal speed control module and the button speed control module, so that the power take-off speed reaches the target speed, which is easy to use and has accurate speed regulation; A fault diagnosis and torque limiting mechanism for the power take-off function is designed to prevent overload of the power take-off port, and the current fault status is prompted through a display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a vehicle power take-off control method provided in Embodiment 1 of the present invention; Figure 2 A control logic diagram of a vehicle power take-off control method provided in Embodiment 1 of the present invention; Figure 3 This is a structural block diagram of a motor control device for a mobile lifting work platform provided in the second embodiment of the present invention; DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] For ease of understanding, the following explanations are given for the terms in this application: TCU (Telematics Control Unit): Telematics control unit, used for two-way information communication between the vehicle and the external network. It is an existing mature technology and will not be described in detail. VCU: Vehicle Control Unit (VCU) is the core control unit in new energy vehicles. It is responsible for coordinating and managing various subsystems of the vehicle to ensure the safe and efficient operation of the vehicle. It is an existing mature technology and will not be elaborated on here. Embodiment 1:

[0021] This embodiment provides a vehicle power take-off control method, as shown in the attached Figure 1 and attached Figure 2 include: Step 1: Obtaining operating condition information, and determining whether to enter or exit the standby state according to the operating condition information: When all power taking entry conditions are met, entering the power taking standby state; When any power take-off exit condition is met, the power take-off standby state is exited, and after exiting the power take-off standby state, the power take-off speed is reset to zero; Among them, the power take-off entry conditions include that the vehicle has been connected to high voltage, the handbrake has been pulled, the power take-off switch has been pressed, and the gear is in the parking gear; the power take-off exit conditions include that the power take-off switch has been turned off, the vehicle has been cut off from high voltage, there is a power take-off failure, and the physical vehicle speed is greater than the vehicle speed calibration value.

[0022] The operating condition information is obtained based on existing sensors and identification modules to determine whether the vehicle has been connected to high voltage, whether the handbrake has been pulled, whether the power take-off switch has been pressed, and whether the gear is in the parking gear, and will not be repeated here.

[0023] Step 2: In the power take-off activation state, based on the input accelerator pedal on / off signal or the power take-off increase / decrease signal, control the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal, wherein the previous input signal is the accelerator pedal on / off signal input in the previous power take-off speed adjustment stage or the power take-off increase / decrease signal input in the previous power take-off speed adjustment stage: In response to the first acquisition of the accelerator pedal opening and closing signal, the power take-off standby state is converted to the power take-off activation state, and the VCU is controlled to adjust the power take-off speed based on a preset idle speed; Based on the input accelerator pedal opening and closing signal, controlling the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal includes: When the opening and closing degree of the accelerator pedal opening and closing signal is 0%-30%, the current power take-off speed is adjusted to IntRpm; When the opening and closing degree of the accelerator pedal opening and closing signal is 30%-50%, the current power take-off speed is adjusted to IntRpm+Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 50%-80%, the current power take-off speed is adjusted to IntRpm+2Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 80%-100%, the current power take-off speed is adjusted to MaxRpm; Among them, the IntRpm is the power take-off speed obtained from the previous input signal. When the IntRpm is the collected accelerator pedal opening and closing signal, the IntRpm is the idle speed, Grad is the calibration value, and MaxRpm is the maximum power take-off speed.

[0024] Based on the input power take-off increase or decrease signal, controlling the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal includes: When the input is a power take-off reduction signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm-DecGrad; When the input is a power take-off reduction signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm-4(T-t+1)DecGrad until the power take-off speed is 0; When the input is a power take-off increase signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm+IncGrad; When the input is a power take-off increase signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm+4(T-t+1)IncGrad until the requested speed reaches MaxRpm; Among them, AppRpm is the power take-off speed obtained from the previous input signal, DecGrad is the calibrated decreasing gradient, T is the duration of the power take-off signal, Inclad is the calibrated increasing gradient, MaxRpm is the maximum power take-off speed, and in this embodiment, t can be 1.

[0025] The above-mentioned IntRpm, Grad, MaxRpm, DecGrad, t and IncGrad are all adjustable values ​​according to actual applications.

[0026] Step three: cyclically input the throttle pedal opening and closing signal or the power take-off increase and decrease signal. It should be noted that in order to avoid logic conflicts, only one logic can be run at the same time, that is, the power take-off increase and decrease signal is not input while the throttle pedal opening and closing signal is input, and vice versa. Based on the speed obtained based on the previous input signal, that is, based on the pedal determined speed or requested speed obtained from the previous input signal, the VCU is controlled to adjust the power take-off speed of the current input signal until the pedal determined speed or requested speed reaches the target speed to achieve speed regulation.

[0027] In addition, it should be noted that when any of the following conditions is met: the power take-off switch is closed, the vehicle has cut off the high voltage, there is a power take-off fault, and the physical vehicle speed is greater than the vehicle speed calibration value, the speed is reset and the execution method is stopped. The judgment of whether the power take-off switch is closed, whether the vehicle has cut off the high voltage, whether the power take-off is faulty, and whether the physical vehicle speed is greater than the vehicle speed calibration value is the same as mentioned above, which belongs to the existing mature technology and will not be repeated here.

[0028] Step 4: During the power taking process, the TCU is controlled to feedback the power taking state to the VCU. When the power taking state fed back by the TCU is that no power is taken, the VCU is controlled to send a power taking fault signal to the CAN network, and the CAN network is controlled to send the power taking fault signal to the display device and prompt. During the power taking process, the VCU is controlled to obtain the maximum torque signal of the power taking fed back by the TCU, and the motor power is calculated based on the real-time collected power taking speed and the maximum torque signal of the power taking, and the motor power is limited to not exceed the preset output motor power threshold. By performing fault monitoring and output torque limitation during the entire power taking function process, the reliability of the power taking operation is improved, ensuring accurate identification of power taking faults and timely warnings. Embodiment 2:

[0029] The present invention provides a vehicle power take-off control device, such as Figure 3 As shown, including: The pedal speed control module is used to control the VCU to adjust the current power take-off speed based on the input accelerator pedal opening and closing signal when the power take-off is activated; The key speed control module is used to control the VCU to adjust the current power take-off speed based on the input power take-off increase or decrease signal when the power take-off is activated; The VCU is used to respond to the control of the pedal speed control module and / or the key speed control module, and adjust the current power take-off speed based on the power take-off speed obtained by the previous input signal until the current power take-off speed reaches the target speed; The previous input signal is an accelerator pedal opening and closing signal input in the previous power take-off speed adjustment stage or a power take-off increase or decrease signal input in the previous power take-off speed adjustment stage.

[0030] Furthermore, it also includes: A power take-off initialization module is used to control the VCU to adjust the power take-off speed based on a preset idle speed in response to the first acquisition of an accelerator pedal opening and closing signal after entering the power take-off standby state; The diagnosis and protection module is used to control the TCU to feedback the power taking state to the VCU during the power taking process, and when the power taking state fed back by the TCU is no power taking, control the VCU to send a power taking fault signal to the CAN network, and control the CAN network to send the power taking fault signal to the display device and prompt; The VCU is controlled to obtain the maximum torque signal of the power take-off fed back by the TCU, and the motor power is calculated based on the power take-off speed and the maximum torque signal collected in real time, so as to limit the motor power to not exceed a preset output motor power threshold.

[0031] The mobile lifting work platform motor control device provided in the embodiment of the present invention can execute the vehicle power take-off control method provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle power take-off control method, characterized in that: include: In the power take-off activation state, based on the input accelerator pedal on / off signal or power take-off increase / decrease signal, the VCU is controlled to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal until the current power take-off speed reaches the target speed; The previous input signal is an accelerator pedal opening and closing signal input in the previous power take-off speed adjustment stage or a power take-off increase or decrease signal input in the previous power take-off speed adjustment stage.

2. The vehicle power take-off control method according to claim 1, characterized in that: The method further comprises: Obtaining working condition information, and determining whether to enter or exit the power take-off standby state according to the working condition information: When all power taking entry conditions are met, entering the power taking standby state; When any power take-off exit condition is met, exit the power take-off standby state; The power take-off entry conditions include: the vehicle has been connected to high voltage, the handbrake has been pulled, the power take-off switch has been pressed, and the gear is in the parking gear; the power take-off exit conditions include: the power take-off switch has been turned off, the vehicle has been cut off from high voltage, there is a power take-off fault, and the physical vehicle speed is greater than the vehicle speed calibration value; In response to the accelerator pedal opening and closing signal being collected for the first time, the power take-off standby state is converted into a power take-off activation state.

3. The vehicle power take-off control method according to claim 2, characterized in that: After exiting the power take-off standby state, the power take-off speed is reset to zero.

4. The vehicle power take-off control method according to claim 2, characterized in that: After entering the power take-off standby state, in response to the first acquisition of the accelerator pedal opening and closing signal, the VCU is controlled to adjust the power take-off speed based on a preset idle speed.

5. The vehicle power take-off control method according to claim 4, characterized in that: Based on the input accelerator pedal opening and closing signal, the VCU is controlled to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal, including: When the opening and closing degree of the accelerator pedal opening and closing signal is 0%-30%, the current power take-off speed is adjusted to IntRpm; When the opening and closing degree of the accelerator pedal opening and closing signal is 30%-50%, the current power take-off speed is adjusted to IntRpm+Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 50%-80%, the current power take-off speed is adjusted to IntRpm+2Grad; When the opening and closing degree of the accelerator pedal opening and closing signal is 80%-100%, the current power take-off speed is adjusted to MaxRpm; Among them, the IntRpm is the power take-off speed obtained from the previous input signal. When the IntRpm is the collected accelerator pedal opening and closing signal, the IntRpm is the idle speed, Grad is the calibration value, and MaxRpm is the maximum power take-off speed.

6. The vehicle power take-off control method according to claim 1, characterized in that: Based on the input power take-off increase or decrease signal, controlling the VCU to adjust the power take-off speed based on the power take-off speed obtained by the previous input signal includes: When the input is a power take-off reduction signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm-DecGrad; When the input is a power take-off reduction signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm-4(T-t+1)DecGrad until the power take-off speed is 0; When the input is a power take-off increase signal that disappears within the unit time t, the current power take-off speed is adjusted to AppRpm+IncGrad; When the input is a power take-off increase signal that lasts for unit time t or more, the current power take-off speed is adjusted to AppRpm+4(T-t+1)IncGrad until the requested speed reaches MaxRpm; Among them, AppRpm is the power take-off speed obtained from the previous input signal, DecGrad is the calibrated decreasing gradient, T is the duration of the power take-off signal, Inclad is the calibrated increasing gradient, and MaxRpm is the maximum power take-off speed.

7. The vehicle power take-off control method according to claim 1, characterized in that: Also includes: During the power taking process, the TCU is controlled to feedback the power taking status to the VCU. When the TCU feedback power taking status is that no power is taken, the VCU is controlled to send a power taking fault signal to the CAN network. The CAN network is controlled to send the power taking fault signal to the display device and prompt.

8. The vehicle power take-off control method according to claim 1, characterized in that: Also includes: During the power taking process, the VCU is controlled to obtain the maximum torque signal of the power taking fed back by the TCU, and the motor power is calculated based on the real-time collected power taking speed and the maximum torque signal of the power taking, so as to limit the motor power to not exceed the preset output motor power threshold.

9. A vehicle power take-off control device, characterized in that: include: The pedal speed control module is used to control the VCU to adjust the current power take-off speed based on the input accelerator pedal opening and closing signal when the power take-off is activated; The key speed control module is used to control the VCU to adjust the current power take-off speed based on the input power take-off increase or decrease signal when the power take-off is activated; The VCU is used to respond to the control of the pedal speed control module and / or the key speed control module, and adjust the current power take-off speed based on the power take-off speed obtained by the previous input signal until the current power take-off speed reaches the target speed; The previous input signal is an accelerator pedal opening and closing signal input in the previous power take-off speed adjustment stage or a power take-off increase or decrease signal input in the previous power take-off speed adjustment stage.

10. The vehicle power take-off control device according to claim 9, characterized in that: Also includes: A power take-off initialization module is used to control the VCU to adjust the power take-off speed based on a preset idle speed in response to the first acquisition of an accelerator pedal opening and closing signal after entering the power take-off standby state; The diagnosis and protection module is used to control the TCU to feedback the power taking state to the VCU during the power taking process, and when the power taking state fed back by the TCU is no power taking, control the VCU to send a power taking fault signal to the CAN network, and control the CAN network to send the power taking fault signal to the display device and prompt; The VCU is controlled to obtain the maximum torque signal of the power take-off fed back by the TCU, and the motor power is calculated based on the power take-off speed and the maximum torque signal collected in real time, so as to limit the motor power to not exceed a preset output motor power threshold.

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