A vehicle on-site power take-off and vehicle speed fault monitoring method, control device and system

Abstract

The present invention discloses a vehicle on-site power take-off and vehicle speed fault monitoring method, control device and system. The vehicle on-site power take-off method comprises the following steps: in response to receiving a power take-off switch signal, obtaining an output signal of a gear detection sensor installed on a gearbox; in response to the output signal of the gear detection sensor indicating that the vehicle gear is in neutral, entering a PTO torque output mode. This solution installs a gear detection sensor on the gearbox. When the vehicle is stationary and needs to use an external power take-off function, it only needs to operate the power take-off switch. The vehicle control unit can directly enter the PTO torque output mode when it recognizes the neutral signal of the gear detection sensor. The operation is simple and the cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle in-situ power take-off, and in particular relates to a vehicle in-situ power take-off, vehicle speed fault monitoring method, control device and system. Background Art

[0002] ‌ In-situ power take-off means that when the power take-off is used, the vehicle remains stationary while the power take-off works normally and outputs power. ‌ This power take-off method is often used for special vehicles that require high power output, such as dump trucks, truck cranes, etc.‌

[0003] When a special vehicle with a cruise button takes power on the spot, it is necessary to manually press the cruise button to start the PTO power take-off mode and then operate the power take-off button to take power, so that the vehicle can accurately enter the PTO torque output mode, that is, the pulse train output torque output mode. Otherwise, it will enter the conventional idle torque output mode. When the output torque is greater than the idle output torque and the vehicle speed is zero, the vehicle will report an abnormal speed fault. Improper operation will reduce the user experience, and shielding or reducing the sensitivity of reporting faults does not meet the requirements of regulatory inspections. When the vehicle control unit ECU monitors the rationality of the vehicle speed fault, as long as the vehicle speed is 0 and the torque is greater than the set torque for more than a certain period of time, the ECU will not activate the PTO function and an error will occur. However, for vehicles that do not have a cruise activation PTO button installed, as long as the power take-off is used on the spot and exceeds the limit torque, an error will be reported, and a torque limit will occur, which will have a great impact on the normal use of the vehicle.

[0004] When a special-purpose vehicle without a cruise button takes power in place, it is necessary to add an additional PTO torque entry switch, press the PTO torque entry switch, and then open the power take-off switch in place.

[0005] In this regard, the existing in-situ power take-off technology requires the installation of a cruise button on the steering wheel or an additional PTO button switch. If the operation sequence is incorrect, the engine will not be able to enter the PTO torque mode normally, causing the vehicle to report an abnormal speed failure. The operation process is cumbersome and costly. Summary of the invention

[0006] In order to solve the problem that existing special vehicles requiring high power output have inconvenient operation and high cost in taking power in situ, the present invention proposes a vehicle taking power in situ, a vehicle speed fault monitoring method, a control device and a system.

[0007] The objective of the present invention is achieved through the following technical solutions: The first aspect of the present invention discloses a method for taking power from a vehicle in situ, comprising the following steps: In response to receiving a power take-off switch signal, acquiring an output signal of a gear position detection sensor mounted on a gearbox; In response to the output signal of the gear detection sensor indicating that the vehicle gear is in neutral, the vehicle enters a PTO torque output mode.

[0008] A second aspect of the present invention discloses a vehicle speed fault monitoring method, comprising the following steps: Receive power take-off switch signal, actual engine water temperature, clutch signal, output signal of gear position detection sensor, actual torque inside the engine, engine speed, and actual vehicle speed; In response to the power take-off switch signal indicating that the PTO function is not activated, the actual engine water temperature is greater than the calibrated limit, the clutch signal indicating that the clutch is not stepped on, the output signal of the gear position detection sensor is 0, the actual torque inside the engine is greater than the torque threshold, the engine speed is greater than the speed threshold, and the actual vehicle speed is less than the minimum vehicle speed threshold, the duration of the state is timed; In response to the duration of this state being greater than the time threshold, a vehicle speed reasonable fault error prompt is generated.

[0009] The third aspect of the present invention discloses a vehicle control unit, comprising a memory and a controller which are communicatively connected in sequence, wherein the memory stores a computer program, and the controller is used to read the computer program to execute a vehicle in-situ power taking method described in the first aspect and / or a vehicle speed fault monitoring method described in the second aspect.

[0010] The fourth aspect of the present invention discloses a vehicle control system, comprising a gearbox with a power output interface, an engine, a clutch connected between the gearbox and the engine, a power take-off installed between the engine and the clutch, a power take-off switch and a control unit; the gearbox is provided with a gear detection sensor for detecting a vehicle gear signal, the gearbox, engine, clutch, power take-off switch, power take-off and gear detection sensor are all electrically connected to the control unit, and the control unit is a vehicle control unit described in the third aspect.

[0011] The beneficial effects of the present invention are: The present invention installs a gear detection sensor on the engine. When the vehicle is stationary and needs to use the external power take-off function, it only needs to operate the power take-off switch. The vehicle control unit recognizes the neutral signal of the gear detection sensor and can directly enter the PTO torque output mode. The operation is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the vehicle control system of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device 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", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The first aspect of the present invention discloses a method for taking power from a vehicle in situ, comprising the following steps: In response to receiving a power take-off switch signal, acquiring an output signal of a gear position detection sensor mounted on a gearbox; In response to the output signal of the gear detection sensor indicating that the vehicle gear is in neutral, the vehicle enters a PTO torque output mode.

[0021] A second aspect of the present invention discloses a vehicle speed fault monitoring method, comprising the following steps: Receive power take-off switch signal, actual engine water temperature, clutch signal, output signal of gear position detection sensor, actual torque inside the engine, engine speed, and actual vehicle speed; In response to the power take-off switch signal indicating that the PTO function is not activated, the actual engine water temperature is greater than the calibrated limit, the clutch signal indicating that the clutch is not stepped on, the output signal of the gear position detection sensor is 0, the actual torque inside the engine is greater than the torque threshold, the engine speed is greater than the speed threshold, and the actual vehicle speed is less than the minimum vehicle speed threshold, the duration of this state is timed; In response to the duration of this state being greater than the time threshold, a vehicle speed reasonable fault error prompt is generated.

[0022] Specifically, the torque threshold is 150N.m; the speed threshold is 1500rpm; and the minimum vehicle speed threshold is 2km / h. The calibrated limit of the actual engine water temperature is 50℃. The time threshold is generally set to 200s. If any of the conditions are not met during this period, the vehicle speed rationality fault will not be judged.

[0023] The third aspect of the present invention discloses a vehicle control unit, including a memory and a controller that are sequentially connected in communication, the memory stores a computer program, and the controller is used to read the computer program to execute a vehicle in-situ power taking method described in the first aspect and / or a vehicle speed fault monitoring method described in the second aspect. For example, the memory may include, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a flash memory (Flash Memory), a first-in-first-out memory (FIFO) and / or a first-in-last-out memory (FILO), etc.; the controller may not be limited to a microcontroller of the STM32F105 series. In addition, the computer device may also include, but is not limited to, a power supply unit, a display screen and other necessary components.

[0024] A fourth aspect of the present invention discloses a vehicle control system, such as Figure 1 As shown, the vehicle control system includes a gearbox 1 with a power output interface, an engine 2, a clutch 3 connected between the gearbox and the engine, a power take-off 4 installed between the engine and the clutch, a power take-off switch and a control unit; wherein, the structure and connection relationship of the gearbox 1, the engine 2, the clutch 3 and the power take-off 4 are implemented by the existing technology, and can be implemented by the existing technology. A gear detection sensor 5 for detecting the vehicle gear signal is provided on the gearbox, and the gearbox, the engine, the clutch, the power take-off switch, the power take-off 4 and the gear detection sensor are all electrically connected to the control unit. The control unit realizes the pulse train output torque output mode control according to the signals of the power take-off switch and the gear detection sensor. Specifically, the vehicle control unit adopts the vehicle in-situ power take-off method in the first aspect to realize in-situ power take-off control.

[0025] Specifically, the control unit is connected to the gear position detection sensor via a neutral switch harness of a chassis harness.

[0026] In order to further realize vehicle speed fault monitoring, the system includes a temperature acquisition unit for collecting engine water temperature signals, a torque sensor for collecting engine internal torque, a speed sensor for collecting engine speed, and a speed sensor for collecting vehicle speed. The temperature acquisition unit, torque sensor, speed sensor, and speed sensor are all connected to the vehicle control unit by signals. The vehicle control unit adopts the vehicle speed fault monitoring method in the second aspect to realize reasonable speed fault error prompts.

[0027] By adopting this solution, when the steering wheel does not have a cruise button but has a demand for a local power take-off function, the cost of the vehicle manufacturer to add a PTO torque output control button can be reduced, which is economical and practical.

[0028] When the vehicle is stationary and needs to use the external power take-off function, the rear-end operator directly activates the power take-off switch, reducing the driver's operation of entering the cab to manually operate the PTO output mode button, which is convenient and practical. It can lower the driver's technical threshold for use and avoid "unreasonable vehicle speed" failures caused by misoperation.

[0029] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for taking power from a vehicle in situ, characterized in that: The following steps are involved: In response to receiving a power take-off switch signal, acquiring an output signal of a gear position detection sensor mounted on a gearbox; In response to the output signal of the gear detection sensor indicating that the vehicle gear is in neutral, the vehicle enters a PTO torque output mode.

2. A vehicle speed fault monitoring method, characterized in that: The following steps are involved: Receive power take-off switch signal, actual engine water temperature, clutch signal, output signal of gear position detection sensor, actual torque inside the engine, engine speed, and actual vehicle speed; In response to the power take-off switch signal indicating that the PTO function is not activated, the actual engine water temperature is greater than the calibrated limit, the clutch signal indicating that the clutch is not depressed, the output signal of the gear position detection sensor is 0, the actual torque inside the engine is greater than the torque threshold, the engine speed is greater than the speed threshold, and the actual vehicle speed is less than the minimum vehicle speed threshold, timing the duration of the state; In response to the duration of this state being greater than the time threshold, a vehicle speed reasonable fault error prompt is generated.

3. A vehicle speed fault monitoring method according to claim 2, characterized in that: The torque threshold is 100 Nm to 250 Nm.

4. A vehicle speed fault monitoring method according to claim 2, characterized in that: The speed threshold is 1000 rpm to 2000 rpm.

5. A vehicle speed fault monitoring method according to claim 2, characterized in that: The minimum vehicle speed threshold is 2 km / h.

6. A vehicle control unit, comprising a memory and a controller which are communicatively connected in sequence, wherein a computer program is stored in the memory, characterized in that: The controller is used to read the computer program and execute the vehicle in-situ power taking method described in claim 1 and / or the vehicle speed fault monitoring method described in any one of claims 2-5.

7. A vehicle control system, comprising a gearbox with a power output interface, an engine, a clutch connected between the gearbox and the engine, a power take-off device installed between the engine and the clutch, a power take-off switch and a control unit; characterized in that: The gearbox is provided with a gear detection sensor for detecting a vehicle gear signal. The gearbox, engine, clutch, power take-off switch, power take-off and gear detection sensor are all electrically connected to the control unit. The control unit is a vehicle control unit as described in claim 6.

8. A vehicle control system according to claim 7, characterized in that: The utility model also comprises a chassis wiring harness, wherein the chassis wiring harness comprises a gear switch wiring harness for connecting the control unit and the gear position detection sensor.

9. A vehicle control system according to claim 7, characterized in that: It also includes a temperature sensor for collecting engine water temperature signals, an injector for collecting fuel injection volume, a speed sensor for collecting engine speed, a speed sensor for collecting vehicle speed, and a gear sensor for gear identification. The temperature sensor, injector, speed sensor, speed sensor, and gear sensor signals are all connected to the vehicle control unit.

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