JPH0488214A - Inching control method for clutch type automatic transmission - Google Patents

Abstract

PURPOSE:To prevent occurrence of shock and engine stall at the starting time by releasing the relation between an inching pedal operation rate and a clutch stroke when a vehicle is stopped or a forward/rearward gear is not set to a neutral position until the inching pedal is operated to a position near a stroke end, and controlling the clutch stroke based on the relation in respect to further operation rate of the pedal. CONSTITUTION:Signals detected by sensors 1 to 8 for a vehicle speed and the like are input to a CPU 10 together with a signal from a ROM 11 directly or through an A/D converter 9, for driving a clutch controlling actuator 13 through a D/A converter 12 and an actuator driving circuit 14. A clutch is not engaged even with operation of an inching pedal when a vehicle is stopped and a proceeding/retreating gear is set to a position other than neutral due to the inching pedal position detecting sensor 8. The clutch is then connected based on the relation of the ROM 11 by a returning operation after operating the pedal to a position near a stroke end. Shock and engine stop are thus prevented at the starting time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inching control method for an industrial vehicle equipped with a clutch type automatic transmission.

[Conventional technology]

The relationship between the amount of depression of the inching pedal and the amount of clutch engagement for inching control in a conventional industrial vehicle equipped with a clutch-type automatic transmission is shown in FIG.
At the initial stage of depression of the inching pedal, the clutch remains engaged, and after a certain degree of depression, the clutch disengages in proportion to the amount of depression. Further, in the relationship shown in FIG. 5, if the vehicle is stopped by operating the inching pedal alone and the foot is released from the inching pedal, the clutch will be engaged and the engine will either stall or the vehicle will suddenly start.

Therefore, conventionally, when the foot is released from the inching pedal, the clutch stroke returns only halfway, and the clutch is kept in a disengaged state.

[Problem to be solved by the invention]

As mentioned above, when the vehicle stops after depressing the inching pedal once, and then depressing the inching pedal again after the inching pedal is released, the relationship shown in Figure 5 is returned to, and the clutch that was started to depress suddenly This caused the vehicle, which had been stopped, to suddenly start, making it impossible to slowly start the vehicle in this case.

The present invention has been made in consideration of the above-mentioned points, and is designed so that when the inching pedal is started to be depressed for an inching start, the engagement control starts from the disengaged position of the clutch, so that the inching start is smooth and shock-free. It is an object of the present invention to provide an inching control method for a clutch type automatic transmission that enables starting and eliminates engine stalling.

[Means to solve the problem]

In order to achieve the above object, the inching control method for a clutch type automatic transmission according to the present invention includes a vehicle speed detecting means, a clutch stroke detecting means, an inching pedal stroke detecting means, an inching pedal position detecting means, and an inching pedal position detecting means. an arithmetic processing means that performs arithmetic processing based on the signal from the detection means and the data from the storage device and outputs an output signal;
It consists of a drive means that is driven based on an output signal from this arithmetic processing means, and a clutch control actuator that is controlled by this drive means. In the inching control method for a clutch-type automatic transmission, in which the above-mentioned memory device stores a relationship in which the clutch is engaged when the vehicle is stopped, and the clutch is gradually disengaged as the pedal is further depressed, is not neutral, the relationship between the inching pedal depression amount and the clutch stroke is canceled until the inching pedal is depressed near the stroke end, and after the inching pedal depression amount is near the stroke end, the clutch stroke is adjusted according to the above relationship. I made it change.

[For production]

To start using the inching pedal when the vehicle is stopped and the forward/reverse gear is not in neutral, press the inching pedal to near the end of its stroke, and then press the inching pedal until it reaches the end of its stroke. The clutch stroke is gradually changed and the vehicle is started slowly.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 4.

FIG. 2 shows a control block of an industrial vehicle to which the method of the present invention is applied. In the figure, 1 is a vehicle speed detection sensor that detects the vehicle speed, 2 is an accelerator pedal stroke sensor that detects the depression stroke of the accelerator pedal, 3 is a clutch stroke detection sensor that detects the stroke amount of the clutch, 4 is a forward/reverse gear position detection sensor that detects the shift position of the forward/reverse gear, and 5 is 12 that detects the shift position of each of the first and second gears. Speed gear position detection sensor, 6
7 is an inching pedal stroke detection sensor that detects the depression stroke of the inching pedal. 8 is an inching pedal position detection sensor that detects the depression position of the inching pedal. It is. These detection signals are sent to the CPU directly or via the A/D converter 9.
(central processing unit) 10, and these C, P U
10, predetermined arithmetic processing is performed. 1
1 stores data and inputs it to CPUl0
It's OM.

12 is a D/A converter that converts the signal from CPU10 into D/A, 13 is a clutch control actuator that controls the clutch, and 14 is a drive unit that drives the clutch control actuator 13 based on the signal from the D/A converter 12. This is an actuator drive circuit.

Figure 3 shows the relationship between the amount of depression of the inching pedal and the clutch stroke during inching control. Through the calculation processing of the CPU 10, the clutch is maintained in the engaged state at the initial stage of depression of the inching pedal, and after it is depressed to a certain extent. The clutch is designed to disengage in proportion to the amount of depression. During the depression stroke of the inching pedal, as shown in FIG. , a second switch 16,17 is provided. Both switches 16 and 17 constitute an inching pedal position detection sensor 8.

In addition, the following conditions are met: (1) The vehicle speed detection sensor 1 detects vehicle speed zero (v-0), (2) The inching pedal stroke detection sensor 7 detects that the inching pedal 15 is not depressed, ( 3) Under the three conditions that the forward/reverse gear position detection sensor 6 indicates that the forward/reverse gear is in the forward or reverse position, the relationship shown in FIG. 2
Data is stored in ROMI 1 such that the clutch will not operate even if the inching pedal 15 is operated until both switches 16 and 17 are turned on.

Of the above-mentioned switches 16 and 17, the first switch 16 is turned on when the inching pedal 16 is depressed and turned off when the inching pedal 16 is released, and the second switch 17 is turned on when the inching pedal 15 is depressed. It is turned ON by the operation, but it is not turned OFF by the returning operation of the pedal 15. When the inching pedal 15 returns, the first switch 16 is turned OFF, and the second switch 17 is turned OFF when the vehicle speed is zero. It's supposed to be.

In the above-mentioned inching stroke, the stroke end vicinity A is the position of the inching pedal depression amount corresponding to the clutch engagement amount close to the "contact" side within a range where the clutch does not drag.

An inching control method according to the present invention using the above configuration will be explained using the flowchart of FIG. 1 and the block diagram of FIG. 2.

Now, each detection sensor detects the above three conditions, that is, the vehicle speed is zero, the inching pedal 15 is not depressed, the forward/reverse gear is in either forward or reverse position, and the sensor is attached to the inching pedal part. When the signal indicating that the first switch 16 is turned off is input to the CPU10, the CPU10 retrieves the data from the ROMI 1 and sets the clutch engagement amount to the state corresponding to the stroke end vicinity A of the inching pedal 15, that is, the engaged state. Outputs a signal to move to the zero total amount position and wait. Then, this signal passes through the D/A converter 12, the actuator drive circuit 14, and the clutch control actuator 13 to adjust the amount of depression of the clutch or inching pedal to near the stroke end A.
The clutch is placed on standby at the clutch stroke position corresponding to .

FIG. 1 shows the effect when the inching pedal 15 is depressed in the above state.

When you step on the inching pedal 15 (step 1),
The switch 16 is turned on (step 2), and then the second
The switch 17 is turned on (step 2). Until this second switch 17 is turned on, the CPU 10 receives the signal from the inching pedal stroke detection sensor 6
The data from M11 is read, the instruction signal to the clutch control actuator 13 is stopped, and the clutch does not operate even if the inching pedal 15 is depressed. When the second switch 17 is turned ON, the CPU 10 receives the signals from these two switches 16 and 17 and switches the ROMIs 1 to 3.
The map shown in the figure is taken out and a signal to operate the clutch is issued according to this map (step 3). That is, when both switches 16 and 17 are turned ON, the clutch stroke operates according to the relationship shown in FIG. 3 in accordance with the operation of the inching pedal 15. That is, between A4 and A4B in FIG. 3, the clutch is gradually engaged and disengaged as the inching pedal 15 is operated.

As the amount of depression of the inching pedal 15 is decreased and the first switch 16 is turned off, this signal and a signal from the vehicle speed detection sensor 1 due to the fact that the vehicle is stopped at this time are received (step 5). The CPU 10 issues a signal to turn off the second switch 17 (step 6), and also issues a standby command to move the clutch to the clutch stroke position corresponding to the inching pedal depression amount A when the foot is released from the inching pedal 15.

Even if the first switch 16 is turned off, if the vehicle is running, the amount of depression of the inching pedal 15 and the clutch stroke are operated according to the relationship shown in FIG. 3.

〔Effect of the invention〕

According to the present invention, even if the inching pedal 15 is depressed and operated when the vehicle is stopped and the forward/reverse gear is in a position other than neutral, the clutch does not engage, and the inching pedal 15
After depressing to near the stroke end of this,
The clutch will be gradually stroked (engaged) according to the amount of return operation, and when the vehicle is stopped, the clutch will not suddenly engage when the inching pedal is depressed, and the clutch will be smooth and shock-free when inching and starting. In addition to being able to start the vehicle, there is no sudden load on the engine, which eliminates stalling.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
2 is a flowchart, 2 is a block diagram, FIG. 3 is a diagram showing the relationship between the clutch stroke and the amount of inching pedal depression, and FIG. 4 is a configuration explanatory diagram showing the inching pedal and sensors. FIG. 5 is a diagram for explaining the conventional method. 1 is a vehicle speed detection sensor, 3 is a clutch stroke detection sensor, 4 is a forward/reverse gear position detection sensor, 5 is a 1.2 speed gear position detection sensor, 6 is a forward/reverse switching lever position detection sensor, 7 is an inching pedal stroke detection sensor , 8 is an inching pedal position detection sensor, 10 is a CPU, 11 is a ROM, 13 is a clutch control actuator, 14 is an actuator drive circuit, 15 is an inching pedal, 16
．． 17 is a switch. Figure 1

Claims (1)

[Claims] Vehicle speed detecting means, clutch stroke detecting means, inching pedal stroke detecting means, inching pedal position detecting means, signals from these detecting means and data from the storage device are subjected to arithmetic processing and output signals are generated. It consists of an arithmetic processing means, a driving means driven based on an output signal from the arithmetic processing means, and a clutch control actuator controlled by this driving means, and the normal relationship between the inching pedal depression amount and the clutch stroke is
At the beginning of pressing the inching pedal, the clutch is engaged,
In the inching control method for a clutch-type automatic transmission in which the above-mentioned storage device stores a relationship in which the clutch is gradually disengaged as the clutch is further depressed, when the vehicle is stopped and the forward/reverse gear is not in neutral, The relationship between the inching pedal depression amount and the clutch stroke is canceled until the inching pedal is depressed near the stroke end, and after the inching pedal depression amount reaches the vicinity of the stroke end, the clutch stroke changes according to the above relationship. An inching control method for a clutch-type automatic transmission characterized by: