JPH0488216A - Inching control method for clutch type automatic transmission - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

[Conventional technology]

In conventional clutch-type automatic transmission, a pedal for inching (fine movement) operation corresponding to the clutch of the left transmission is provided separately from the clutch pedal, and during normal driving, the accelerator pedal is used to drive like an automatic car, and the inching Sometimes, the inching operation is performed by depressing both the inching pedal and the accelerator pedal.

[Problem to be solved by the invention]

With the conventional inching control method and method described above, normal driving becomes like an automatic car and driving operation is easy. When performing the inching operation, there was not much difference in the operation method from that of the direct car, and the operation was troublesome.

The present invention has been made in consideration of the above-mentioned problems, and allows for inching movement by simply operating the accelerator pedal in the same way as normal operation of an automatic transmission without using the inching bedano C, thereby facilitating the inching operation. It is an object of the present invention to provide an inching control method for a clutch type automatic transmission that can achieve the following.

[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 main clutch interposed between an engine and a transmission, and a main clutch that controls the main clutch to be in a disengaged or half-clutch state. A clutch control means, a speed change means of the transmission, a vehicle speed detection means for detecting the traveling speed of the vehicle, an accelerator amount detection means for detecting the amount of depression of the accelerator pedal, and an accelerator opening capable of changing the engine rotation speed. In an automatic transmission equipped with an engine rotation speed detection means for detecting the rotation speed of the engine, and a controller for controlling each of the above-mentioned control means using an input signal from the valley detection means, the accelerator pedal is pressed during normal driving. By controlling the vehicle speed and switching the controller to inching mode during inching driving, the main vehicle speed control based on the accelerator pedal depression operation is performed so that the vehicle speed is within the vehicle speed range suitable for inching driving even if the engine speed is at its maximum. Controls the clutch control means.

[For production]

During the inching operation, the vehicle speed is controlled within a vehicle speed range suitable for inching driving by depressing the accelerator pedal.

〔Example〕

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

FIG. 2 schematically shows the travel control section of an industrial vehicle using a clutch type automatic transmission to which the present invention is applied.
In the figure, 1 is an engine, 2 is a transmission connected to this via a main clutch 3, and 4 is a drive wheel connected to an output shaft 5 of the transmission 2. 6 is an engine rotation speed detector that detects the rotation speed of the output shaft of the engine 1; 7 is an input shaft rotation speed detector that detects the rotation speed of the input shaft of the transmission 2; and 8 is an engine rotation speed detector that detects the rotation speed of the input shaft of the transmission 2. A vehicle speed detector that detects the vehicle speed by detecting the rotation speed; 9 an accelerator opening controller that can change the rotation speed of the engine 1; and 10 an engine control stroke that detects the control stroke of the accelerator opening controller 9. 11 is a main clutch controller that can control the main clutch to engage, disengage, and half-clutch state, 12 is a main clutch control stroke detector that detects the stroke of this, and 13 is a stop.

A forward/reverse gear switching controller that switches between forward and reverse, 14 a forward/reverse gear switching detector that detects the switching stroke thereof, 15 a transmission controller that performs high-speed and low-speed shifting, and 16 a transmission that detects this switching. It is a detector. and 17
18 is a controller that receives signals from each of the detectors and outputs predetermined control signals to each controller, and 18 is a display that displays the results.

Also, 19 is a key, 20 is an inchin brake lever 21 is a brake pedal, 22 is an accelerator pedal, an inchin brake lever 20
, is equipped with an inching changeover switch 23 and an inching lever rotation angle detector 24 for detecting the rotation angle of the inching lever 20. 25 is a brake operation amount detector that detects the amount of operation of the brake pedal 21, and 26 is an accelerator operation amount detector that detects the amount of operation of the accelerator pedal 22.

The key 19, the inching changeover switch 23, and each detector 24, 25. '26 is connected to the controller 17.

Reference numeral 27 indicates a range lever for instructing the controller 17 to change the speed. Similarly, 28 is a forward/reverse switching lever for instructing the controller 17 to stop, move forward or backward.

The controller 17 outputs a signal to control each controller according to each detected input value so that the vehicle travels at a predetermined speed, or in particular, outputs a signal to control each controller in accordance with each detected input value. Control is performed so that the relationship shown in the figure is achieved.

That is, first, as shown by the dotted line a in the figure, the engine rotation speed and clutch engagement amount are adjusted so that the normal maximum vehicle speed is achieved in proportion to the amount of depression of the accelerator pedal 22, as shown by the dotted line a in the figure. The signal is output to the accelerator opening controller 9 and the main controller/sochi controller 11.

Also, the inching selector switch 2 of the indenter par 20
3 is turned ON, the accelerator opening controller 9 of the engine 1 is controlled by inclination/<-20 instead of the accelerator pedal 22, and the operation amount detector 26 of the accelerator pedal 22 is controlled. The main clutch controller 11 is controlled by an input signal from the main clutch controller 11. The main clutch controller 11 controls the amount of depression of the accelerator pedal 22 at this time by
Even if the engine speed is at the maximum, half-clutch control is performed so that the vehicle speed is only at the maximum vehicle speed or the vehicle speed vi suitable for inching travel, as shown in the bottom of FIG. In this case, inchindala par 2
When the engine speed is lowered by the control based on 0, the vehicle speed control by the accelerator pedal 22 changes as shown in c and d in FIG. 3 in accordance with the engine speed.

The inching control sub-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.

First, turn on the key 19 to start the engine 1. Further, the gear stage and traveling direction of the transmission 2 are set by setting the range lever 27 and the forward/reverse switching lever 28.

During normal driving, the vehicle speed is controlled as indicated by the dotted line a in FIG. 3 by depressing the accelerator pedal 22.

During inching travel, the inching selector switch 23 of the inching greno<-20 is turned on (step 1).

As a result, the controller 17 enters the inching mode (step 2), and the rotational speed of the engine 1 is controlled by the rotation of the inching drooper 20 according to the inching drooper shown in FIG. 3 (step 3). Then, the vehicle speed at this time is controlled by the accelerator pedal 22 (step 4), or the vehicle speed at this time is controlled by the solid line shown in FIG.
controlled along c and d.

By turning off the switch 23 of the inching lever 20 (step 5), the inching mode is canceled and the vehicle enters the normal driving mode using the accelerator pedal 22 (step 6).

[Effects of the Invention] According to the present invention, when the vehicle is inching, the vehicle speed other than idling can be controlled to the maximum vehicle speed suitable for inching using only the accelerator pedal 22 by switching with the inching dipper 20. During inching, the inching operation can be carried out by only operating the accelerator pedal 22 in the same way as in normal operation of an automatic transmission, without using an inching lever, thereby facilitating the inching operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a flowchart, Fig. 2 is a system configuration diagram for implementing the invention, and Fig. 3 is a diagram showing the relationship between the amount of accelerator pedal depression and vehicle speed. be. 1 is an engine, 2 is a transmission, 3 is a main clutch, 6 is an engine rotation speed detector, 8 is a vehicle speed pressure detector, 9 is an accelerator opening controller, 10 is an engine control stroke detector, 1
1 is a main clutch controller, 12 is a main clutch control stroke detector, 17 is a controller, 20 is an inching dipper, 22 is an accelerator pedal, 23 is an inching changeover switch, 24 is an inching dipper rotation angle detector,
26 is an accelerator operation amount detector. Figure 7'' 7t Le depression amount

Claims (1)

[Claims] A main clutch interposed between the engine and the transmission, a main clutch control means for controlling the main clutch to be in a disengaged and half-clutch state, a speed change means for the transmission, and a vehicle speed detection means for detecting the running speed of the vehicle. , an accelerator amount detection means for detecting the amount of depression of the accelerator pedal, an accelerator opening degree control means capable of changing the engine rotation speed, an engine rotation speed detection means for detecting the engine rotation speed, and each of the above-mentioned control means. In an automatic transmission equipped with a controller that is controlled by input signals from each detection means, the vehicle speed is controlled by the accelerator pedal during normal driving, and when the vehicle is inching, the controller is switched to inching mode and the accelerator pedal is depressed. 1. An inching control method for a clutch type automatic transmission, comprising controlling a main clutch control means so that the vehicle speed is controlled within a vehicle speed range suitable for inching driving even when the engine speed is at a maximum.