Exhaust brake control method and device for large-tonnage mining truck

Abstract

The invention provides an exhaust brake control method and device for a large-tonnage mining truck, and the method comprises the steps: obtaining the operation state information of the mining truck through a vehicle control unit, and forming a control instruction according to the operation state information of the mining truck; the vehicle control unit sends the formed control instruction to an engine controller; and the engine controller controls the engine according to the control instruction so as to reduce the rotating speed of the engine. The running state information of the mining truck is obtained, the control instruction is formed according to the running state information of the mining truck, and the engine is controlled through the control instruction to reduce the rotating speed of the engine of the truck, so that the vehicle speed is reduced in a short time, and the problem that the brake heating temperature is too high when the large-tonnage mining truck goes downhill for a long distance is solved.

Description

Technical Field

[0001] The present invention belongs to the field of engineering machinery, and in particular relates to an exhaust brake control method and device for a large-tonnage mining truck. Background Art

[0002] Large-tonnage mining trucks used underground often travel long, fully loaded downhill distances, requiring operators to frequently or continuously apply the brakes. This prolonged operation can overheat the truck's brakes, leading to overheating and failure. High brake temperatures can also cause tire blowouts, contamination of the brake cooling oil, and even failure. Summary of the Invention

[0003] The embodiments of the present application provide an exhaust brake control method and device for a large-tonnage mining truck. By reducing the engine speed of the truck, the vehicle speed is reduced in a short period of time, thereby solving the problem of excessively high brake heating temperature when a large-tonnage mining truck is traveling downhill for a long distance.

[0004] In a first aspect, an embodiment of the present application provides an exhaust brake control method for a large-tonnage mining truck, comprising:

[0005] The vehicle controller obtains the operating status information of the mining truck and generates control instructions based on the operating status information of the mining truck;

[0006] The vehicle controller sends the generated control instruction to the engine controller;

[0007] The engine controller controls the engine according to the control instruction to reduce the rotation speed of the engine.

[0008] The vehicle controller obtains the operating status information of the mining truck and generates control instructions based on the operating status information of the mining truck, including:

[0009] The vehicle controller obtains the operating status information of the mining truck, and the operating status information includes: engine speed, engine water temperature, engine oil temperature, and accelerator pedal status; when the engine speed is greater than a preset speed and lasts for a first preset time; the engine water temperature is greater than a first preset temperature and lasts for a second preset time; the engine oil temperature is greater than a second preset temperature and lasts for a third preset time; and / or the accelerator pedal request signal is zero and lasts for a fourth preset time, the vehicle controller generates a control instruction.

[0010] Among them, the vehicle controller obtains the operating status information of the mining truck through the CAN bus.

[0011] The engine controller controls the engine according to the control instruction to reduce the engine speed, including: the vehicle controller sends a braking instruction to the engine controller, and the engine controller controls the injector to stop injecting fuel.

[0012] Among them, when the vehicle controller obtains the operating status information of the mining truck, if the detected engine speed, engine water temperature, and engine oil temperature at the current moment are compared with the engine speed, engine water temperature, and engine oil temperature at the previous moment, and the change value exceeds the preset range, the frequency of detecting the truck's operating status will be increased.

[0013] In a second aspect, the present application provides an exhaust brake control device for a large-tonnage mining truck, comprising:

[0014] The vehicle controller is used to obtain the operating status information of the mining truck and form a control instruction based on the operating status information of the mining truck; the vehicle controller sends the formed control instruction to the engine controller; the engine controller is used to control the engine according to the control instruction to reduce the engine speed.

[0015] Among them, the vehicle controller is used to: the vehicle controller obtains the operating status information of the mining truck, and the operating status information includes: engine speed, engine water temperature, engine oil temperature, and accelerator pedal status; when the engine speed is greater than the preset speed and continues for a first preset time; the engine water temperature is greater than the first preset temperature and continues for a second preset time; the engine oil temperature is greater than the second preset temperature and continues for a third preset time; and / or the accelerator pedal request signal is zero and continues for a fourth preset time, the vehicle controller forms a control instruction.

[0016] Among them, the vehicle controller obtains the operating status information of the mining truck through the CAN bus.

[0017] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0018] The fourth invention, the present application provides a mining truck, comprising any one of the above-mentioned large-tonnage mining truck exhaust brake control devices.

[0019] The exhaust brake control method and device for a large-tonnage mining truck according to the present application have the following beneficial effects:

[0020] This application obtains operating status information from a mining truck, generates control instructions based on this information, and uses these instructions to control the engine, thereby reducing the truck's engine speed and, therefore, the vehicle's speed in a short period of time. This solves the problem of excessive brake heating on large-tonnage mining trucks during long downhill descents. This application provides an auxiliary braking method for large-tonnage trucks on downhill descents, reducing brake wear and heat, extending brake service life, lowering the risk of brake failure, and extending the lifespan of the brake cooling oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of an exhaust brake control method for a large-tonnage mining truck according to an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of an exhaust brake control device for a large-tonnage mining truck according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following description provides multiple embodiments of the present invention, and different embodiments can be replaced or combined, so this application can also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then this application should also be considered to include embodiments containing one or more of all other possible combinations of features A, B, C, and D, even though such embodiments may not be explicitly described in the following text.

[0025] like Figure 1 As shown, the exhaust brake control method for a large-tonnage mining truck of the present application includes: S101, the vehicle controller obtains the operating status information of the mining truck and forms a control instruction according to the operating status information of the mining truck; S103, the vehicle controller sends the formed control instruction to the engine controller; S105, the engine controller controls the engine according to the control instruction to reduce the engine speed.

[0026] In some embodiments, the vehicle controller obtains the operating status information of the mining truck and forms a control instruction based on the operating status information of the mining truck, including: the vehicle controller obtains the operating status information of the mining truck, and the operating status information includes: engine speed, engine water temperature, engine oil temperature, and accelerator pedal status; when the engine speed is greater than a preset speed and lasts for a first preset time; the engine water temperature is greater than a first preset temperature and lasts for a second preset time; the engine oil temperature is greater than a second preset temperature and lasts for a third preset time; and / or the accelerator pedal request signal is zero and lasts for a fourth preset time, the vehicle controller forms a control instruction.

[0027] The vehicle control unit (VCU) collects driver control information, vehicle operating conditions, engine, motor, battery, transmission data, and feedback from various subsystems. It then calculates and sends control commands to each subsystem, thereby enabling the VCU to control the entire vehicle. The VCU's strategy is to combine the motor, battery, and engine to drive the vehicle for optimal efficiency under different operating conditions.

[0028] In some embodiments, the vehicle controller obtains operating status information of the mining truck via the CAN bus. The automotive CAN bus network structure can be either closed-loop or open-loop. The CAN bus consists of two signal lines: CANH and CANL, and lacks a clock synchronization signal. Therefore, CAN is an asynchronous communication method, similar to the asynchronous communication method of UART. The two signal lines of the CAN bus typically use twisted-pair cables and transmit differential signals. The bus voltage level is indicated by the voltage difference between the two signal lines, CANH-CANL. Transmitting information using differential signals offers advantages such as strong anti-interference capabilities and effective suppression of external electromagnetic interference. A terminal device on the CAN bus is called a node. In a CAN network, there is no distinction between master and slave devices. The hardware components of a CAN node typically include a CAN controller and a CAN transceiver. The CAN controller is responsible for logical control of the CAN bus and implements the CAN transmission protocol; the CAN transceiver is primarily responsible for converting the MCU's logic levels to the CAN bus levels. CAN supports multi-host systems, allowing multiple nodes to send and receive data simultaneously. This distributed control structure makes the system more flexible and suitable for complex embedded networks. Nodes on the CAN bus can both send and receive data, without distinction between master and slave. However, at the same time, only one node can send data, while other nodes can only receive data.

[0029] In some embodiments, the engine controller controls the engine to reduce engine speed based on control instructions, including: the vehicle controller sends a braking command to the engine controller, which in turn controls the injectors to stop injecting fuel. The engine controller (ECU) controls the operation of various components of the internal combustion engine. It monitors the engine through sensors and determines parameters such as fuel injection amount and ignition timing, thereby affecting vehicle performance, fuel consumption, and emissions. The engine controller not only controls the fuel injection amount during each engine cycle but also adjusts the variable valve timing and turbocharger boost level.

[0030] The fuel injector receives injection pulse signals from the engine control unit (ECU) to precisely control the amount of fuel injected. The injector's spray characteristics include atomization particle size, mist distribution, fuel beam direction, range, and diffusion cone angle. These characteristics must meet the requirements of the diesel engine's combustion system to ensure perfect mixture formation and combustion, and achieve high power and thermal efficiency.

[0031] In some embodiments, when the vehicle controller acquires operating status information of a mining truck, if the detected engine speed at a current moment varies by more than a preset range compared to the previous moment, indicating a significant change in the engine speed, the frequency of detecting the engine speed is increased. If the detected engine water temperature at a current moment varies by more than a preset range compared to the previous moment, indicating a significant change in the engine water temperature, the frequency of detecting the engine water temperature is increased. If the detected engine oil temperature at a current moment varies by more than a preset range compared to the previous moment, indicating a significant change in the engine oil temperature, the frequency of detecting the engine oil temperature is increased.

[0032] When the engine speed, engine water temperature, and engine oil temperature change rate is large, the frequency of detecting the engine speed, engine water temperature, and engine oil temperature is increased. This can more accurately obtain the current operating status information of the truck, thereby forming more accurate control instructions and more accurately reducing the engine speed of the truck, avoiding the overheating of the brakes when large-tonnage mining trucks go downhill for long distances.

[0033] After receiving the driver's exhaust brake switch closure signal, the vehicle controller begins to assess exhaust brake conditions. Exhaust brake CAN bus command issuance conditions: collected truck operating status information. The vehicle controller sends the exhaust brake command to the transmission controller. While the truck is operating, the transmission controller determines the speed difference between the engine and turbine. When the speed difference is less than a certain value, the torque converter enters the lockup state. At this point, the transmission controller transmits the lockup status to the CAN bus. The vehicle controller outputs a signal to the lockup solenoid valve after determining that the following conditions are met: 1) the exhaust brake switch is closed, 2) the vehicle controller sends the exhaust brake command to the engine controller, and 3) the vehicle controller receives the torque converter lockup status signal from the transmission controller. Exhaust brake device: exhaust brake solenoid valve, exhaust brake solenoid valve oil inlet: lockup valve LU port, exhaust brake solenoid valve oil outlet: engine exhaust brake cylinder, exhaust brake valve oil return: transmission oil sump. Exhaust brake status indication: A normally open pressure switch determines whether exhaust braking is in effect.

[0034] like Figure 2 As shown, the present application provides an exhaust brake control device for a large-tonnage mining truck, including: a vehicle controller 201, used to obtain the operating status information of the mining truck and form a control instruction based on the operating status information of the mining truck; the vehicle controller sends the formed control instruction to the engine controller; the engine controller 202, used to control the engine according to the control instruction to reduce the engine speed.

[0035] In this application, the embodiment of the exhaust brake control device for large-tonnage mining trucks is basically similar to the embodiment of the exhaust brake control method for large-tonnage mining trucks. For relevant details, please refer to the introduction of the embodiment of the exhaust brake control method for large-tonnage mining trucks.

[0036] The present application also provides a mining truck, comprising any of the above-mentioned exhaust brake control devices for large-tonnage mining trucks.

[0037] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method for controlling the exhaust brake of a large-tonnage mining truck. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a microdrive, a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any other type of medium or device suitable for storing instructions and / or data.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for controlling exhaust brake of a large-tonnage mining truck, characterized in that: include: The vehicle controller obtains the operating status information of the mining truck and generates control instructions based on the operating status information of the mining truck; The vehicle controller sends the generated control instruction to the engine controller; The engine controller controls the engine according to the control instruction to reduce the rotation speed of the engine.

2. The exhaust brake control method for a large-tonnage mining truck according to claim 1, characterized in that: The vehicle controller obtains the operating status information of the mining truck and generates control instructions based on the operating status information of the mining truck, including: The vehicle controller obtains the operating status information of the mining truck, and the operating status information includes: engine speed, engine water temperature, engine oil temperature, and accelerator pedal status; when the engine speed is greater than a preset speed and lasts for a first preset time; the engine water temperature is greater than a first preset temperature and lasts for a second preset time; the engine oil temperature is greater than a second preset temperature and lasts for a third preset time; and / or the accelerator pedal request signal is zero and lasts for a fourth preset time, the vehicle controller generates a control instruction.

3. The exhaust brake control method for a large-tonnage mining truck according to claim 2, characterized in that: The vehicle controller obtains the operating status information of the mining truck through the CAN bus.

4. The exhaust brake control method for a large-tonnage mining truck according to any one of claims 1 to 3, characterized in that: The engine controller controls the engine according to the control instruction to reduce the engine speed, including: the vehicle controller sends a braking instruction to the engine controller, and the engine controller controls the injector to stop injecting fuel.

5. The exhaust brake control method for a large-tonnage mining truck according to any one of claims 1 to 3, characterized in that: When the vehicle controller obtains the operating status information of the mining truck, if the detected engine speed, engine water temperature, and engine oil temperature at the current moment exceed the preset range compared with the engine speed, engine water temperature, and engine oil temperature at the previous moment, the frequency of detecting the truck's operating status will be increased.

6. An exhaust brake control device for a large-tonnage mining truck, characterized in that: include: The vehicle controller is used to obtain the operating status information of the mining truck and generate control instructions based on the operating status information of the mining truck; The vehicle controller sends the generated control instruction to the engine controller; The engine controller is used to control the engine according to the control instruction to reduce the engine speed.

7. The exhaust brake control device for a large-tonnage mining truck according to claim 6, characterized in that: The vehicle controller is used to: obtain the operating status information of the mining truck, and the operating status information includes: engine speed, engine water temperature, engine oil temperature, and accelerator pedal status; when the engine speed is greater than a preset speed and lasts for a first preset time; the engine water temperature is greater than a first preset temperature and lasts for a second preset time; the engine oil temperature is greater than a second preset temperature and lasts for a third preset time; and / or the accelerator pedal request signal is zero and lasts for a fourth preset time, the vehicle controller generates a control instruction.

8. The exhaust brake control device for a large-tonnage mining truck according to claim 7, characterized in that: The vehicle controller obtains the operating status information of the mining truck through the CAN bus.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A mining truck, characterized in that: The invention comprises the exhaust brake control device for a large-tonnage mining truck as described in claims 6-8.

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