Heavy-duty tractor emergency reverse system and method

Abstract

The present application relates to the field of tractor gear, specifically, the present application relates to a kind of heavy tractor emergency gear system and method, including speed sensor, gear sensor, emergency start switch, controller, starting motor, temperature sensor and horn, speed sensor, gear sensor, emergency start switch are connected with controller, starting motor is connected with controller by positive rotation wire harness and reverse rotation wire harness, temperature sensor is installed on starting motor, temperature sensor is connected with controller by temperature sensor wire harness, horn is connected with controller by horn wire harness, solve the problem that heavy tractor after fire cannot be disconnected by manpower mechanical connection of engine and gearbox, further appear cannot cut off clutch, not cut off clutch, neutral cannot be engaged, engine also cannot be started, stuck in field cannot move, often need to wait for rescue vehicle to drag, seriously affect the efficiency of operation problem.

Description

Technical Field

[0001] This invention relates to the field of tractor downshifting, and more specifically, to an emergency downshifting system and method for heavy-duty tractors. Background Technology

[0002] With the upgrading of tractor horsepower, mechanical shift heavy-duty tractors are now equipped with hydraulic power-assisted clutches (powered by the engine to push the release spring). Traditional clutches are driven by manually pressing the clutch pedal to push the release spring, and the pedal and release spring are mechanically rigidly connected. In contrast, hydraulic power-assisted clutches are driven by manually pressing the clutch pedal to open the hydraulic power switch, and the engine power pushes the release spring. The pedal and release spring are no longer mechanically rigidly connected.

[0003] Heavy-duty tractors often need to perform heavy-duty operations such as plowing. During heavy-duty operations, the tractor may stall due to a sudden increase in resistance. At this time, the large tractor is still in mechanical operation gear, and the clutch pedal loses engine assistance, making it impossible to disconnect the mechanical connection between the engine and the transmission. In addition, the special inverted cone structure of the shift mechanism makes it impossible to disengage the gear after stalling. Traditional small tractors (without hydraulically assisted clutches) can disconnect the mechanical connection between the engine and the transmission by pressing the clutch pedal, so it is relatively easy to restart after stalling. However, the clutch pedal and release spring of a heavy-duty tractor are no longer mechanically rigidly connected. After stalling, it is impossible to manually disconnect the mechanical connection between the engine and the transmission, resulting in the inability to disengage the clutch. Without disengaging the clutch, neutral cannot be engaged, and the engine cannot be started. This creates a vicious cycle. Heavy-duty tractors stall and cannot be restarted, getting stuck in the field and often needing to be towed by rescue vehicles, which seriously affects work efficiency. Summary of the Invention

[0004] This invention provides an emergency disengagement method for heavy-duty tractors, solving the problem that the clutch pedal and release spring of current heavy-duty tractors are no longer mechanically connected. After the engine stalls, the mechanical connection between the engine and the gearbox cannot be manually disconnected, resulting in the inability to disengage the clutch. If the clutch is not disengaged, neutral cannot be engaged, the engine cannot be started, and the tractor gets stuck in the field, often requiring a rescue vehicle to tow it, which seriously affects work efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a heavy-duty tractor emergency downshifting system, comprising a vehicle speed sensor, a gear position sensor, an emergency start switch, a controller, a starter motor, a temperature sensor, and a horn. The vehicle speed sensor, gear position sensor, and emergency start switch are all connected to the controller. The starter motor is connected to the controller via forward and reverse rotation wiring harnesses. The temperature sensor is mounted on the starter motor and is connected to the controller via a temperature sensor wiring harness. The horn is connected to the controller via a horn wiring harness. The specific operating steps are as follows:

[0006] Step S100: Press the emergency start button;

[0007] Step S110: Determine whether the tractor is in neutral by using the gear position sensor. If yes, the emergency start function ends; otherwise, proceed to step S120.

[0008] Step S120: Determine whether the engine speed is 0, the tractor speed is 0, and the starter motor temperature is below 80°C. If all three conditions are met, proceed to step S130. If any one condition is not met, the horn will issue a voice prompt and the system will be temporarily unavailable.

[0009] Step S130: Determine whether the tractor is in forward gear by using the gear position sensor. If yes, proceed to step S140. If no, proceed to reverse gear and execute program B (start the motor to rotate forward for 2 seconds, pause for 1 second, and reverse for 1 second), and simultaneously execute step S150.

[0010] Step S140: Start the motor and execute program A (start the motor to reverse for 2 seconds, pause for 1 second, and rotate forward for 1 second).

[0011] Step S150, the horn sounds a warning: You are about to use the emergency start function. Please hold the gear shift lever and shift into neutral when starting.

[0012] In step S160, it is detected that the gear is in neutral, and the motor stops operating.

[0013] The beneficial effects of adopting the above technical solutions are:

[0014] 1. This invention can solve the problem of an engine stalling and being unable to restart;

[0015] 2. This invention requires no special operating skills. After pressing the button, the system automatically judges the working condition and executes the motor action to loosen the tractor engagement sleeve, allowing the operator to easily shift into neutral. Attached Figure Description

[0016] Figure 1 This is a simplified component connection diagram of the present invention;

[0017] Figure 2 This is a simplified logic control diagram of the present invention.

[0018] The markings in the diagram correspond to: 1-vehicle speed sensor, 2-gear sensor, 3-emergency start switch, 4-controller, 5-forward rotation wiring harness, 6-reverse rotation wiring harness, 7-starter motor, 8-temperature sensor, 9-temperature sensor wiring harness, 10-horn wiring harness, and 11-horn. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0020] like Figures 1-2 As shown, this invention is an emergency disengagement system and method for heavy-duty tractors. It solves the problem that the clutch pedal and release spring of current tractors are no longer mechanically connected. After the engine is turned off, the mechanical connection between the engine and the gearbox cannot be manually disconnected, resulting in the inability to disengage the clutch. If the clutch is not disengaged, neutral cannot be engaged, the engine cannot be started, and the tractor gets stuck in the field and cannot move. It often requires waiting for a rescue vehicle to tow it, which seriously affects the efficiency of operation.

[0021] Specifically, a heavy-duty tractor emergency disengagement system and method includes a vehicle speed sensor 1, a gear position sensor 2, an emergency start switch 3, a controller 4, a starter motor 7, a temperature sensor 8, and a horn 11. The vehicle speed sensor 1, gear position sensor 2, and emergency start switch 3 are all connected to the controller 4. The starter motor 7 is connected to the controller 4 via a forward rotation harness 5 and a reverse rotation harness 6. The temperature sensor 8 is mounted on the starter motor 7 and is connected to the controller 4 via a temperature sensor harness 9. The horn 11 is connected to the controller 4 via a horn harness 10. The starter motor 7 rotates regularly in both directions, causing the internal gear engagement sleeve of the heavy-duty tractor to loosen. Only after the internal engagement mechanism is loosened can the tractor be engaged in neutral, allowing for a normal restart. The specific working steps are as follows:

[0022] Step S100: Press the emergency start button;

[0023] Step S110: Determine whether the tractor is in neutral by using the gear position sensor. If yes, the emergency start function ends; otherwise, proceed to step S120.

[0024] Step S120: Determine whether the engine speed is 0, the tractor speed is 0, and the starter motor temperature is below 80°C. If all three conditions are met, proceed to step S130. If any one condition is not met, the horn will issue a voice prompt and the system will be unavailable.

[0025] Step S130: Determine whether the tractor is in forward gear by using the gear position sensor. If yes, proceed to step S140. If no, proceed to reverse gear and execute program B (start the motor to rotate forward for 2 seconds, pause for 1 second, and reverse for 1 second), and simultaneously execute step S150.

[0026] Step S140: Start the motor and execute program A (start the motor to reverse for 2 seconds, pause for 1 second, and rotate forward for 1 second).

[0027] Step S150, the horn sounds a warning: You are about to use the emergency start function. Please hold the gear shift lever and shift into neutral when starting.

[0028] In step S160, it is detected that the gear is in neutral, and the motor stops operating.

[0029] This system uses a vehicle speed sensor to determine whether the tractor is moving. If the tractor is moving, the starter motor will activate and damage the starting system. The starter motor can only activate when the tractor is stationary. The vehicle speed sensor also determines whether the engine is running. If the engine is running, the starter motor may grind teeth, damaging the starting mechanism. A starter motor temperature sensor is installed to monitor the starter motor temperature. The starter motor will only activate when the temperature is below 80°C, effectively protecting the starter motor.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for emergency downshifting of a heavy-duty tractor, characterized in that: The specific work steps are as follows: Step S100: Press the emergency start button; Step S110: Determine whether the tractor is in neutral by using the gear position sensor. If yes, the emergency start function ends; otherwise, proceed to step S120. Step S120: Determine whether the engine speed is 0, the tractor speed is 0, and the starter motor temperature is below 80°C. If all three conditions are met, proceed to step S130. If any one condition is not met, the horn will issue a voice prompt and the system will be temporarily unavailable. Step S130: Determine whether the tractor is in forward gear by the gear position sensor. If yes, proceed to step S140. If no, proceed to reverse gear and execute program B. Program B is to start the motor and rotate it forward for 2 seconds, pause for 1 second, and rotate it in reverse for 1 second, while simultaneously executing step S150. Step S140: Start the motor to execute program A, which is to start the motor to reverse for 2 seconds, pause for 1 second, and then rotate forward for 1 second. Step S150, the horn sounds a warning: You are about to use the emergency start function. Please hold the gear shift lever and shift into neutral when starting. In step S160, it is detected that the gear is in neutral, and the motor stops operating.

2. A heavy-duty tractor emergency downshifting system, employing the heavy-duty tractor emergency downshifting method described in claim 1, comprising a vehicle speed sensor (1), a gear position sensor (2), an emergency start switch (3), a controller (4), a starter motor (7), a temperature sensor (8), and a horn (11), characterized in that: The vehicle speed sensor (1), gear position sensor (2), and emergency start switch (3) are all connected to the controller (4). The starter motor (7) is connected to the controller (4) through the forward rotation harness (5) and the reverse rotation harness (6). The temperature sensor (8) is installed on the starter motor (7) and is connected to the controller (4) through the temperature sensor harness (8). The horn (11) is connected to the controller (4) through the horn harness (10).

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