JPH04125319A - Control method for inching in industrial vehicle - Google Patents

Abstract

PURPOSE:To smoothly start a vehicle by, at the time of restepping on an inching pedal, increasing clutch engaging quantity in proportion to the stepping-on quantity of the clutch at early time, and increasing the stepping-on quantity to decrease the clutch engaging quantity in a state where the stepping-on quantity exceeds the fixed one. CONSTITUTION:When an inching pedal is stept on in a state where a vehicle is stopped only by inching operation, and gears are set at the first speed stage, or a forward-backward changing over lever is set at a forward or a backward side, or an accelerator and a brake pedal are not stept on, CPU issues a command based on the secondary data according to the signal issued from an inching pedal stroke detecting sensor 2. When the stepping-on quantity of the inching pedal is within a range from A to the front side of B, a clutch engaging quantity increases in proportion to the stepping-on quantity, and the vehicle begins slow running. When the stepping-on quantity attains the position of B, CPU takes out the primary data, and issues a command to make the clutch engaging quantity attain a control line G-FE-C to the stepping on quantity A-C of the inching pedal for controlling the clutch engaging quantity along the control line until the inching pedal is changed over to a OFF position.

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.
When the inching pedal is initially depressed, the clutch is maintained in a connected state, and after a certain degree of depression, the clutch becomes disengaged relative to the amount of depression.

Furthermore, in the relationship shown in FIG. 8, 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 returns only to point a in FIG. 8, and the clutch is maintained in a disengaged state.

[Problem to be solved by the invention]

As mentioned above, when the inching pedal is pressed once and the vehicle stops, and the inching pedal is released, the inching pedal is pressed again, the relationship shown in Figure 8 is restored, and the clutch suddenly engages when the inching pedal is first pressed. As a result, the vehicle that had been stopped suddenly started, making it impossible to slowly start the vehicle in this case.

The present invention has been made in consideration of the above, and is equipped with a clutch-type automatic transmission that ensures a smooth start of the vehicle without causing sudden start even when the inching pedal is depressed again. The object of the present invention is to provide an inching control method for industrial vehicles.

In addition, when the inching pedal is depressed again, the clutch engagement speed during inching is changed in accordance with the speed at which the inching pedal is depressed by the operator, making it possible to obtain a feeling of inching start that is close to the operator's intention. The object of the present invention is to provide an inching control method for a vehicle.

[Means to solve the problem]

In order to achieve the above object, the inching control method for an industrial vehicle according to the present invention includes an inching pedal stroke detection means, a main clutch input shaft rotation speed detection means, a main clutch output shaft rotation speed detection means, A first gear position detecting means, a first and second gear position detecting means, a clutch stroke detecting means, a brake pedal position detecting means, and a relationship such that the clutch engagement amount decreases as the inching pedal depression amount increases. A storage means that stores data, a clutch control actuator that controls the amount of clutch engagement, and a signal for predetermined operation when the inching pedal is depressed, based on the detection signal from the detection means and the data from the storage means. In an industrial vehicle equipped with a clutch-type automatic transmission comprising a CPU that outputs data to a clutch control actuator, the storage means stores, in addition to control based on the first data, clutch engagement according to an increase in the amount of inching pedal depression. 1 when the control line intersects the control line based on the first data, and a second control line where the clutch engagement amount is controlled in accordance with the control based on the first data.
The second data to be stored in the storage means which performs inching control according to the second data when the inching pedal is depressed while the vehicle is stopped by single operation of the inching pedal, is stored in the storage means for controlling the inching pedal depression amount. A plurality of rates of increase in the amount of clutch engagement are changed and stored, the second data is selected according to the depression speed of the inching pedal, and inching control is performed in accordance with the data.

[For production]

Inching control when the vehicle is stopped by single operation of the inching pedal is such that at the initial stage of depression of the inching pedal, the amount of clutch engagement increases in proportion to the amount of depression according to the second data, and the amount of clutch engagement increases in proportion to the amount of depression of the inching pedal. or when the difference between the input and output shaft rotational speeds of the main clutch is less than a predetermined amount, inching control is performed according to the first data, and the vehicle is smoothly started according to the amount of depression of the inching pedal.

Furthermore, if there is a plurality of pieces of second data with different gradients of the control line, by selecting this second data according to the depression speed of the inching pedal, it is possible to obtain a feel for the inching start that is closer to the operator's intention. You will get a ring.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

FIG. 3 is a control block diagram of an industrial vehicle equipped with a clutch type automatic transmission to which the method of the present invention is applied. An inching pedal stroke detection sensor detects the depression stroke; 3 is a forward/reverse gear position detection sensor that detects the forward/reverse gear switching position; 4 is a forward/reverse gear position detection sensor 8 that detects the respective shift positions of the first gear and the second gear. speed gear detection sensor,
5 is a clutch stroke detection sensor that detects the amount of clutch stroke, and 6 is a brake pedal position detection sensor that detects the amount of depression of the brake pedal. Detection signals from these detection sensors are input to a CPU (central processing unit) 8 via an A/D converter 7, and the CPU
8, predetermined calculation processing is performed. 9 stores data in advance and stores it at any time on the CPU 8.
This is a ROM for importing into. 10 is a D/A converter that converts the signal from the CPU 8 to D/A, 11 is a clutch control actuator that controls the clutch, and 12 is a D/A converter.
an actuator drive circuit that controls the clutch control actuator 11 based on a signal from the converter 10;
13 is an alarm installed near the driver's seat.

The ROM 9 contains first data similar to the conventional one shown in FIG. ' At point F-E, there is a slight break, and A
The first data shows that the clutch is gradually disengaged from E-C compared to the amount of depression of the inching pedal between ' and C, and the second data shown in Fig. 4, that is, the depression stroke of the inching pedal. During the depressing stroke A-B to the intermediate point B of A-C, until the intersection with the control line of the first data is crossed (to detect the intersection, the difference between the input and output shaft rotation speeds of the main clutch is (In other words, it can also be detected by the amount of slippage.) Second data is stored in which the amount of clutch engagement gradually increases compared to the amount of depression of the inching pedal.

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

The state of the vehicle when you stop the vehicle only by inching and then take your foot off the inching pedal is (
1) It is in 1st gear.

(2) The forward/reverse switching lever is in the forward or reverse direction. (3) The accelerator pedal is not depressed.

(4) If the following four conditions are met: the brake pedal is not depressed, each signal at this time is 1.2
Speed gear position detection sensor 4, forward/reverse gear position detection sensor 3
, when human power is input from the accelerator pedal stroke detection sensor 1 and the brake pedal position detection sensor 6 to the CPU 8, R
The CPU 8 retrieves the first data stored in the OM9 and controls the clutch control actuator 11 as in the past.
A signal is issued to make the clutch stand by at the disengaged position just before the half-clutch.

As a result, even if the inching pedal is released, the vehicle remains in a stopped state (the current state is the same as before).

Next, in the above state, when the inching pedal is depressed (step (1)), the signal is transmitted from the inching stroke detection sensor 2 to the A/D converter 7 to the CPU 8.
is input to.

At this time, the CPU 8 retrieves second data (data shown in FIG. 4) from the ROM 9, and drives the actuator drive circuit 12 so that the clutch is engaged based on the relationship of this second data.
A command is issued to the clutch control actuator 11 via the controller (step (2)).

Therefore, when the amount of depression of the inching pedal is from A to just before B, the amount of clutch engagement increases compared to the amount of depression of the inching pedal, and the vehicle gradually starts running.

When the amount of depression of the inching pedal reaches point B (step (3)) and the control line of the second data crosses the control line of the first data, the first data (fifth The data shown in the figure) is retrieved by the CPU 8 (step (4)), and thereafter, the clutch engagement amount is determined by the first data control line G-F-E- with respect to the inching pedal depression amount A-C. C, and until the inching pedal is turned off (step (5)
) The clutch engagement amount is controlled according to the control line shown in FIG.

In this inching control, the above (1) to (4)
) When the vehicle is stopped by an inching operation with the condition (2) being satisfied, the above operation is performed again.

In addition, in the above action, when the inching pedal is depressed,
While the relationship between the amount of inching pedal depression and the amount of clutch engagement is changing according to the control line based on the second data shown in the fourth cause, the amount of inching pedal depression reaches point B, thus reaching point 0. At times, an alarm 13 installed around the driver's seat sounds to notify the operator that the clutch engagement amount will change in accordance with the control line of the first data. The alarm device 13 may be an alarm lamp.

In the above embodiment, the second data to be stored in the ROM 9 is as shown in FIG. A plurality of control lines for the engagement amount are created with different gradients, for example, as shown in FIG. B2. As the clutch engagement amount for B2, A-D, , A-D2. A plurality of control data having different slopes of A-D are stored in the ROM 9 as second data, and the clutch engagement amount is controlled along A-D3 when the inching pedal is depressed slowly, and when the inching pedal is depressed. A-D when stepping at normal speed
2, and when the inching pedal is depressed quickly, it is controlled along A-D.

The operation of this embodiment is as shown in the flowchart shown in FIG. 2. When the depression of the inching pedal is detected (step (1)), the inching pedal stroke detection sensor 2 detects the pedal stroke at this time. The stroke is detected (step (2)), and then the pedal depression speed at this time is calculated by the CPU 8 by measuring the time required for the amount of pedal movement (step (3)), and based on this result. select one of the second data (step (4)), and perform inching control using this selected data (step (5)), so that the control line based on the second data becomes the control line based on the first data. If it matches (step (6)), the control will be performed according to the control line based on the first data (step (7))
. The inching control is ended by turning off the depression of the inching pedal (step (8)).

According to this embodiment, the clutch engagement speed during inching is changed in accordance with the speed at which the inching pedal is depressed by the operator.

〔Effect of the invention〕

According to the present invention, even when the inching pedal is depressed again after the vehicle is stopped by operating the inching pedal alone, the vehicle does not suddenly start, and smooth starting can be ensured.

Further, according to the present invention, when the vehicle is stopped, the latch engagement speed during inching is changed in accordance with the speed at which the inching pedal is depressed by the operator,
You can get the feeling of inching start that is very close to the operator's intention.

[Brief explanation of drawings]

1 and 2 are flowcharts showing different embodiments of the method of the present invention, FIG. 3 is a block diagram showing an inching control system, and FIGS. 4 to 7 show clutch engagement in relation to the amount of inching pedal depression during inching control. FIG. 4 and FIG. 6 are diagrams showing the relationship between contents, and FIGS. 4 and 6 show the inching control state based on the second data, and FIGS. 5 and 7 show the inching control state based on the first data. FIG. 8 is a diagram showing a conventional inching control state. 2 is an inching pedal stroke detection sensor, 3 is a forward/reverse gear position detection sensor, 4 is a 1.2 speed gear position detection sensor, 5 is a clutch stroke detection sensor, 6 is a brake pedal position detection sensor, 8 is a CPU, 11 is a Clutch control actuator, 13 is an alarm. Inching pedal depression Heavy Inching pedal depression Snow Inching pedal depression amount Inching pedal depression Snow Inching pedal depression amount

Claims (2)

[Claims] (1) Inching pedal stroke detection means, main clutch input shaft rotation speed detection means, main clutch output shaft rotation speed detection means, forward/reverse gear position detection means,
1st and 2nd gear position detection means, clutch stroke detection means, brake pedal position detection means, and storage means storing first data in which the amount of clutch engagement decreases as the amount of depression of the inching pedal increases. , a clutch control actuator that controls the clutch engagement amount, and outputs a predetermined operating signal to the clutch control actuator when the inching pedal is depressed, based on the detection signal from the detection means and the data from the storage means. In an industrial vehicle equipped with a clutch-type automatic transmission comprising a CPU, the storage means includes, in addition to the control based on the first data, control such that the clutch engagement amount increases as the inching pedal depression amount increases. is,
When the control line intersects the control line based on the first data, second data is stored so that the clutch engagement amount is controlled according to the control of the first data, and the inching pedal is 1. An inching control method for an industrial vehicle, characterized in that inching control is performed in accordance with the second data when the inching pedal is depressed while the vehicle is stopped by single operation. (2) A plurality of pieces of second data are stored in the storage means by changing the ratio of increase in the amount of clutch engagement to the amount of depression of the inching pedal, and the second data is stored in accordance with the depression speed of the inching pedal. 2. The inching control method for an industrial vehicle according to claim 1, wherein the inching control is performed in accordance with selected data.