KR0185072B1 - Control method of non-stage transmission for a tractor - Google Patents

Abstract

The present invention relates to a continuously variable transmission control method for a tractor that ensures stability by controlling a tractor using a microprocessor, efficiently controls a transmission, and obtains a work setting of an optimum load state, low noise, and fuel saving. Turn on the ignition key, reset the system, turn the signal of each sensor part and valve to zero, turn off the four clutch signals, turn on the engine speed sensor, the variator speed sensor and the output shaft speed sensor. Checking and calculating the values measured by the engine speed sensor, the variator speed sensor, and the output shaft speed sensor, and changing the maximum speed designated control sensor while driving to match the speed with the engine speed sensor, the variator, and the output shaft speed sensor. Operation and check the state of the brake sensor to determine if the output shaft speed is zero if the brake sensor is on. When the output shaft state is zero, the gear combination is neutral, the clutch and the variator are turned off, and when the brake is off at this stage, the state of the accelerator sensor is judged. To zero the combination of gears at zero, and to turn off the variator; and if the accelerator sensor is on at this stage, the clutch is controlled and the variator is set to the engine speed sensor, the variator speed sensor, and the output shaft speed sensor. This is done by sequentially performing the control according to.

Description

Control method of continuously variable transmission for tractor

The present invention relates to a continuously variable transmission control method for a tractor, in particular, by using a microprocessor to control the continuously variable transmission to ensure stability, efficiently control the transmission, to obtain a work setting of optimum load state, low noise, fuel saving, etc. The present invention relates to a continuously variable transmission control method for a tractor, which can, of course, achieve convenience of operation.

In conventional continuously variable transmissions for tractors, the stability is reduced by not using a microprocessor, it is not only difficult to efficiently control the transmission, but also it is difficult to set the optimum load condition, noise is generated, and a lot of fuel is used. There was a problem of consumption.

In addition, there was a problem that the operation is not easy because the electronic control can not be performed.

The continuously variable transmission control method for a tractor of the present invention has been devised to solve such a conventional drawback, and a continuously variable transmission for a tractor that enables easy control using a microprocessor as well as precise automatic control and fuel saving. The purpose is to provide a control method.

The present invention for achieving the above object is to turn on the ignition key, to initialize the system, to set the signal of each sensor unit and valve to the state of zero (0) and to turn off the four clutch signals (S1, S2) and checking the engine speed sensor, the variator speed sensor and the output shaft speed sensor, and calculating the values measured by the engine speed sensor, the variator speed sensor and the output shaft speed sensor (S3, S4), and sudden driving. Detects the forward and backward movement, decelerates to a constant speed, and then proceeds to the next process (S5) and changes the highest speed designated control sensor while driving and operates the engine speed sensor, the variator, and the output shaft speed sensor in a state suitable for the speed. Step (S6) and checking the state of the brake sensor to determine whether the output shaft speed is zero when the brake sensor is on, and neutralizes the combined state of the gears when the output shaft state is zero to each clutch and berry. The step of turning the rotor off (S7-S9), and if the brake is off in step S7, judging the state of the accelerator sensor. If it is off, it is determined whether the output shaft speed is zero. Turning off the actuator (S10-S12) and controlling the clutch when the accelerator sensor is on in step S10, and controlling the variator according to the engine speed sensor, the variator speed sensor, and the output shaft speed sensor ( S12), the operation pedal and the state of the lever, and the interrupt step of checking the error is carried out in sequence.

1 is a block diagram of a continuously variable transmission control apparatus for a tractor to which the present invention is applied.

2 is a graph showing an accelerator pedal control method according to the present invention.

3 is a graph showing a brake pedal control method according to the present invention.

Figure 4 is a graph showing a speed limit lever control method according to the present invention.

5a to 5d are flowcharts illustrating a process of performing the control of the present invention.

* Explanation of symbols for main parts of the drawings

1: engine 2: continuously variable transmission

3-6: Clutch 7: PTO Transmission Part

8: chain 9: planetary gear

10: drive unit 11: input signal unit

12 microprocessor 13 output signal unit

14: operating part

1 is a diagram illustrating a system of a continuously variable transmission control apparatus for a tractor to which the present invention is applied. The engine 1 controls an injection amount of fuel, a continuously variable transmission 2 connected to the engine 1, and the engine ( 1) the first clutch (3) and the third clutch (5) connected to and operated, the PTO transmission (7) and the chain (8) connected to the continuously variable transmission (2), the chain (8) and the first The planetary gear part 9 connected to the first clutch 3, the first clutch 4 and the fourth clutch 6 connected to the chain 8, and the driving part 10 connected to the planetary gear part 9. It is configured to include.

Then, the forward and backward lever 14a, the speed limit lever 14b, the brake pedal 14c, the acceleration pedal 14d, the operating portion 14, and the forward and backward neutral neutral signal, the speed limit adjustment amount from the operating portion 14 , The brake pedal depressing amount and the accelerator pedal depressing amount are inputted, the engine speed signal and the variator speed signal are input from the engine 1 and the continuously variable transmission 2, respectively, and the output speed from the drive unit 10. An input signal unit 11 for receiving a signal and a microprocessor 12 for performing control according to the signal input from the input signal unit 11 are configured.

In addition, the microprocessor 12 outputs a control signal to the output signal unit 13, and the output signal includes a direction control valve control signal, a clutch 1 to 4 valve control signal, a variator 1 professional control signal, and the like. It is configured to include the variator two professional valve control signal, the forward and backward operation valve control signal, and the engine fuel injection control signal.

The direction 1 control signal of the direction control valve control signal controls the clutch 1 valve control signal and the clutch 3 valve control signal, and the direction 2 control signal controls the clutch 2 valve control signal and the clutch 4 valve control signal.

Looking at the operation of the control device having such a configuration, the power transmission from the power transmitted from the engine 1 to the PTO (POWER TAKE OFF) transmission unit 7 and the drive unit 10 is each clutch (3-6), One or more of the chain 8 and the planetary gear portion 9 are formed by a combination.

Here, the connection of the first clutch 3 means mode 1, the connection of the second clutch 4 means mode 2, and the connection of the third clutch 5 mode 3 It means to be, and the fourth clutch 6 is connected means to be in mode 4.

In addition, the configuration of the control device detects input signals from the operating unit 14 and input signals from the engine 1, the continuously variable transmission 2, and the driving unit 10 by the sensors of the input signal unit 11.

In addition, an input signal of the input signal unit 11 is input to the microprocessor 12 and output to the output signal unit 13 to control each unit in the output signal unit 13.

That is, the direction control valve control signal is output in the low state of the clutch 1 valve, the clutch 3 valve, and the high state of the clutch 3 valve, the clutch 4 valve.

The clutch 1 valve control signal to the clutch 4 valve control signal control the first clutch 3, the second clutch 4, the third clutch 5, and the fourth clutch 6, respectively.

In addition, the variator 1 professional control signal and the variator 2 professional valve control signal control the continuously variable transmission 2, and the forward and backward operation valve control signal controls the driving unit 10.

On the other hand, the forward and backward neutral operation valve control signal is a control signal for the forward, reverse, neutral shift.

Hereinafter, the accelerator pedal, the brake pedal, the speed limit lever, and the forward and backward control method of the operating unit 14 will be described in detail with reference to FIGS. 2 to 4.

First, FIG. 2 is a graph illustrating a method of controlling an accelerator pedal, which represents a detection area of a sensor at the moment when the accelerator pedal is operated, and is divided into four stages.

The first stage is a low blind area, the second stage standby area (STAND-BY AREA), the third stage is an accelerating area, the fourth stage is a high blind area, and the first stage is an acceleration. This is the zero state, and in this area the gear remains neutral even if the displacement sensor signal increases.

In the second stage, it can be seen that the acceleration starts to the standby state, and it maintains the neutral state of the gear even if the signal of the displacement sensor increases.

In the third stage, the vehicle is in a driving state, and the speed increases as the amount of stepping on the accelerator pedal increases (signal increase of the displacement sensor).

In the fourth stage, acceleration is the maximum state, and when the driver reaches the limit of the speed limit desired by the driver, only the maximum speed is maintained regardless of the increase of the displacement sensor.

FIG. 3 is a graph illustrating a control method of a brake pedal, and represents a sensing area in a sensor at the moment when the brake pedal is operated.

The first stage is a low blind zone, the second stage is a standby zone, the third stage is a brake zone, the fourth stage is a high blind zone, and the first stage is a high blind zone. Deceleration is zero, and in this area the driving state is maintained even if the displacement sensor signal increases.

In the second stage, it is in the standby state, and it can be seen that acceleration starts.

In the third stage, the gear is decelerated, and as the amount of brake pedal is increased (increasing the signal of the displacement sensor), the speed is gradually decreased and the gear is kept in a neutral state.

In step 4, the deceleration is at its maximum state, and only the maximum deceleration is maintained regardless of the increase of the displacement sensor signal, and the system is in a neutral state.

FIG. 4 is a graph of the speed limit lever, which shows a detection area in the sensor at the moment the speed limit lever is operated, and is divided into three stages.

The first stage is a low blind area, the second stage is a lever displacement area, and the third stage is a high blind area.

Here, in the first step, the desired speed is zero, and in this area, the speed limit is zero even if the signal from the displacement sensor is increased.

In the second stage, the speed limit area is increased, and as the adjustment amount is increased (signal increase of displacement sensor), the speed limit increases gradually.

In the third stage, the maximum speed is maintained, and the driver can operate up to the maximum speed of the system and is maintained at the maximum speed limit regardless of the increase of the displacement sensor signal.

FIG. 5 is an operation flow diagram illustrating a process of performing control in the microprocessor 12, which will be described in detail as follows.

When the ignition key is turned on first, power is supplied (step S1). In the state of initializing the system, the signals of each sensor unit and valve are set to zero, and all four clutch signals are turned off. (Step S2).

The engine speed sensor, the variator speed sensor, and the output shaft speed sensor are examined (step S3), and the values measured by the engine speed sensor, the variator speed sensor and the output shaft speed sensor are calculated (step S4).

The system is controlled according to the change of the forward and backward sensors, and when the sudden forward and backward changes occur while driving, the vehicle decelerates at a constant speed and then proceeds to the next process (step S5).

In addition, if the maximum speed designated control sensor is changed while driving, the engine speed sensor, the variator, and the output shaft speed are changed to operate within a desired speed value in a state suitable for the speed (step S6). Then, the state of the brate sensor is checked (step S7) to determine whether the output shaft speed is zero when the brake sensor is on (step S8).

If the output shaft state is zero, the combined state of the gears is neutral, each clutch is in the off state, and the variator is in the off state (step S9).

However, if the output shaft speed is not zero, the next step is taken.

In addition, if the brake is off in step S7, the accelerator sensor state is determined (step S10). If it is off, it is determined whether the output shaft speed is zero (step S11). If zero, the combination state of the gears is neutral and the variator is off. If the output axis speed is not zero, follow the next step.

On the other hand, when the accelerator sensor is on, the variator and the clutch are simultaneously controlled, and the variator is controlled according to the engine speed sensor, the variator speed sensor, and the output shaft speed sensor (step S12).

Next, as shown in FIG. 5B, the control is started downward in the state of mode 4 when moving forward and backward, and the control is started in the state of mode 2 when moving forward.

The clutch controls the valve suitable for each mode according to the output shaft speed sensor and controls the direction of the variator.

If the output shaft speed is zero, the gear combination is neutral and the variator is turned off, as shown in Fig. 5C.

That is, the states of neutral 1 and neutral 2 in Fig. 5A are shown in Fig. 5C.

On the other hand, the interrupt processing of the program has an interrupt service process for all signal values input to ensure more precise and stable, this interrupt processing process occurs continuously during the process of performing the control, see Fig. 5d When described in detail as follows.

That is, the interrupt service routine starts (step S20), and then checks the brake sensor, the accelerator sensor, the forward and backward adjustment sensor, and the maximum speed designated adjustment sensor (step S21).

Then, the error is checked and fixed to the clutch 1 mode when a sudden abnormality occurs (step S22).

However, if no abnormality occurs, the interrupt service routine is completed (step S23).

According to the present invention, the continuously variable transmission control method for a tractor can not only secure stability by controlling the continuously variable transmission using a microprocessor, but also efficiently control the transmission, and can not only set the operation of the optimum load state. Low noise, fuel savings, etc. can be obtained, and the operation of the device can be facilitated.

Claims (6)

Turning on the ignition key and initializing the system so that the signals of each sensor unit and valve are set to zero and the four clutch signals are turned off (S1, S2), engine speed sensor and variator speed. Inspecting the sensor and the output shaft speed sensor, calculating the values measured by the engine speed sensor, the variator speed sensor, and the output shaft speed sensor (S3, S4), and detecting abrupt forward and backward driving while decelerating to a constant speed. After proceeding to the next step (S5), and operating the engine speed sensor, the variator, the output shaft speed sensor in a state suitable for the speed by changing the highest speed designated control sensor while driving (S6), and the state of the brake sensor If the brake sensor is turned on, it is determined whether the output shaft speed is zero, and when the output shaft state is zero, neutralizing the combined state of the gears, and turning off each clutch and the variator (S7-S9) and the S7 stage. If the brake is off, the state of the accelerator sensor is judged, and if it is off, it is determined whether the output shaft speed is zero, and if it is zero, neutralizing the combined state of the gears and turning off the variator (S10-S12) and the step S10. Control the clutch when the accelerator sensor is on, the stepless control method for tractor characterized in that the step of controlling the variator according to the engine speed sensor, the variator speed sensor, the output shaft speed sensor (S12) in order to perform . 2. The continuously variable transmission for a tractor according to claim 1, wherein in step S2, the control is started from the state of mode 4 when the motor is forward and the control is started from the mode 2 when the motor is backward. Control method. As soon as the accelerator pedal is activated, the acceleration is at zero, the dead zone where the gear is maintained neutral, and the gear remains neutral even when the acceleration and the acceleration sensor signal are increased. The second stage, which is the standby zone, and the third stage, which is the acceleration zone where the speed increases as the amount of stepping of the accelerator pedal is increased, and the acceleration is the maximum, and the driver reaches the desired speed limit. A continuously variable transmission control method for a tractor, comprising the fourth step, which is a dead zone maintained only at the maximum speed limit regardless of increase. At the moment when the brake pedal is operated, the deceleration is zero, and the first stage, which is the dead zone that maintains the driving state even when the displacement sensor signal is increased, and the acceleration is started, and the drive is increased even when the displacement sensor signal is increased. The second stage, which is the standby area to maintain the state, and the third stage, which is the acceleration area to maintain the neutral state of the gear, as the speed decreases and the amount of stepping of the brake pedal increases, and the deceleration is the maximum state, and the displacement sensor A stepless transmission control method for a tractor, comprising the fourth step, which is a dead zone in which the system is maintained at the maximum deceleration irrespective of increase or decrease and the system maintains a neutral state. At the moment the speed limit lever is operated, the desired speed is zero and the first stage, which is the dead zone where the speed limit is zero even if the displacement sensor signal increases, and the area where the speed limit is increased. The control method for a continuously variable transmission for a tractor comprising: a second step of increasing a lever displacement area and a third step of a dead band area of a maximum speed state maintained only at a limited maximum speed regardless of an increase in a displacement sensor signal. When the interrupt service routine starts, steps (S20 and S21) for checking the brake sensor, the accelerator sensor, the forward and backward adjustment sensor, and the maximum speed designated control sensor and the error are checked, and when an error occurs, the clutch 1 mode is not generated. If the stepless transmission control method for a tractor, characterized in that the step consisting of completing the interrupt service routine (steps S22, S23).