JPH067962Y2 - Vehicle automatic clutch control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of an automatic clutch control device for a vehicle.

(Prior Art) In recent years, many vehicles are equipped with an automatic transmission that automatically performs a gear shifting operation by interposing a torque converter between the engine and the transmission in order to reduce driver fatigue. Since the torque converter is a fluid coupling, its output transmission efficiency is inevitably inferior to that of a mechanical clutch, which is disadvantageous in terms of improving fuel efficiency.

Therefore, in order to improve not only the ease of operation but also the fuel consumption, the conventional transmission and mechanical clutch are used, and instead of the driver operating the clutch and transmission, these are automatically changed by electronic control. The present applicant has proposed an automatic transmission adapted to perform the above (see, for example, Japanese Utility Model Laid-Open No. 60-49028).

FIG. 4 is a flow chart showing the control operation, and the basic operation is no different from the operation of the automatic transmission using the torque converter.

For example, while driving in the D range (auto drive range),
As shown in FIG. 6, when it is determined that the vehicle speed V increases due to acceleration and a gear shift (shift up) is required, 21 to 21
At 23, the control lever of the fuel injection pump is returned to the no-load position and, at the same time, the mechanical clutch is disengaged to set the transmission to the neutral position. The sixth
The figure is a flow chart showing the operation of the shift-up control performed in step 10 of FIG.

In 24, in order to reduce the synchronization amount, the transmission is held at the neutral position for the specified time t ₀ . Then, at 25 to 27, the gear is set to a predetermined gear position to connect the clutch, and at the same time, the control lever is returned to the original position.

By the way, in such a device, the clutch is intermittently operated within a certain range (before and after the half clutch region) according to the accelerator opening degree by turning on a half clutch control mode designating switch provided in the driver's cab. You can do it.

FIG. 6 is a flow chart for explaining the control operation. When the control is started with the half-clutch control mode designating switch turned on, at 31 the position immediately before the clutch disc comes into contact with the flywheel and the clutch. The clutch is intermittently operated according to the accelerator opening degree between the position where the disc is in full contact with the flywheel and the position where the disc is in full contact. That is, when the accelerator pedal is depressed, the clutch is moved to the connecting side, and when released, the clutch is moved to the disconnecting side.

Therefore, when traffic congestion occurs in an urban area or the like, by turning on the half-clutch control mode designating switch or the like, the driver can travel at a very low speed only by depressing the accelerator pedal 45.

(Problems to be solved by the invention) By the way, in such a device, when the vehicle speed is not low speed running through traffic congestion, the half-clutch control mode designating switch is turned off (half-clutch control mode). However, if the driver sometimes forgets to turn off the half-clutch control mode designating switch, the half-clutch control mode (the clutch is set between the position immediately before the half-clutch and the fully connected position depending on the accelerator opening degree) will be forever. Since the intermittently operated state) is executed, there is a problem that the clutch is consumed early.

(Means for Solving Problems) In order to solve such problems, the present invention, as shown in FIG. 1, means for engaging and disengaging a mechanical clutch, means for detecting a stroke position of the clutch, and an accelerator. A means for detecting the degree of opening, a means for instructing a half-clutch control mode when the vehicle is traveling at a low speed, and a half-clutch for intermittently controlling the clutch between the half-clutch position and the fully engaged position at the time of this instruction An automatic clutch control device for a vehicle having a control means is provided with a means for detecting a vehicle speed and a means for releasing a half-clutch control mode when the vehicle speed exceeds a predetermined value.

(Operation) The half-clutch control mode is automatically released when the vehicle speed exceeds a predetermined value (the vehicle is not in the slow speed running state). Therefore, under normal driving conditions, the half-clutch is not normally used and wear of the clutch is not promoted, and the durability of the clutch is improved.

(Embodiment) FIG. 2 is a schematic view showing a mechanical structure of an embodiment of the present invention applied to a diesel engine. In this embodiment, a fuel injection pump 41 with a mechanical governor 30, a mechanical clutch 42, and a transmission 43 are provided. A control unit 60 is provided which is provided with various detecting means for detecting these operating states and an actuator for driving them, and which is composed of a microcomputer based on signals from these detecting means.
Controls the actuator to realize automatic shifting.

First, a means for detecting the operating state is required as the detecting means, and this operating state can be determined from the engine load, the position of the select lever, the clutch disengaged state, the actual shift position of the transmission, and the vehicle speed. Therefore, the accelerator pedal 45 has a depression angle (accelerator opening degree) of the accelerator pedal 45 as an engine load.
The accelerator opening sensor 50 for detecting the
8 is a selector position sensor 51 for detecting the position of the select lever 49, and the mechanical clutch 42 is a clutch stroke sensor 54 for detecting the stroke amount of the clutch.
However, the transmission 43 has a shift position sensor 58 for detecting an actual shift position, and a propeller shaft 44.
A vehicle speed sensor 56 for detecting the rotational speed of the main shaft connected to the rear axle via the vehicle is provided.

Further, the driver's cab is provided with a half-clutch control mode designating switch 40 for designating a half-clutch control mode for intermittent operation according to the accelerator opening degree between the position immediately before the half-clutch and the fully connected position during low speed travel. To be

Next, as a control target of the control unit 60 for these detecting means, the fuel injection pump 41 has a fully closed actuator 53 for operating the control lever to the fully closed position, and the clutch 42 has the clutch disengaged. The clutch actuator 55 is provided with a gear shift actuator 59 that drives a gear shift mechanism in the transmission 43 to set a gear.

The control unit 60 that controls these actuators determines a target shift stage from a shift-up map preset in the circuit based on the accelerator opening and the vehicle speed during acceleration traveling in the D range (auto drive range), for example. When the target shift stage and the actual shift stage are different from each other, it is determined that a shift is necessary, and the actuator 5
A gear shift control signal is output to 3, 55 and 59 to lower the engine speed to engage and disengage the clutch and shift the gear to a predetermined gear position.

On the other hand, when the half-clutch control mode designating switch 40 is ON, the clutch is intermittently operated according to the accelerator opening as described later.

FIG. 3 is a flow chart for explaining the operation of the slow speed traveling control performed by the control unit 60, and the numbers in the figure show the process numbers.

Turn on half clutch control mode designating switch 40 at 40
At the time of 41, the clutch is intermittently operated according to the accelerator opening degree between the position immediately before the half-clutch and the fully connected position (before and after the half-clutch region) at 41 (half-clutch control mode). As a result, the driver can drive at a very low speed only by operating the accelerator during traffic congestion.

Then, the vehicle speed V increases and a predetermined value V ₀ (for example, 5 km / h
If it exceeds, half-clutch control mode designation switch 40 O
The half-clutch control mode described above is released regardless of N or OFF (step 42).

Therefore, even if the driver forgets to turn off the half-clutch control mode designating switch 40 when the vehicle is traveling at a vehicle speed that is not very slow, the half-clutch control mode is released when the vehicle speed exceeds the predetermined value V _0. Therefore, it is possible to prevent early wear of the clutch and the like due to unnecessary half-clutch control.

(Effects of the Invention) In short, according to the present invention, the half-clutch control mode is automatically released when the vehicle speed rises above a predetermined value and the vehicle does not run at a slow speed, so that good running performance and a clutch are always provided. The effect of helping to secure durability is obtained.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to claims for clarifying the constitution of the present invention, FIG. 2 is a schematic diagram for explaining the mechanical constitution of an embodiment of the present invention, and FIG. 3 is a fine speed traveling control performed in a control unit. 6 is a flowchart illustrating the operation of FIG. 4 to 6 are flowcharts for explaining the operation of the prior application. 40 ... Half-clutch control mode designation switch, 41 ...
Fuel injection pump, 42 ... Clutch, 43 ... Transmission, 49 ... Select lever, 50 ... Accelerator position sensor, 51 ... Selector position sensor, 53 ...
Fully closed actuator, 54 ... Clutch stroke sensor, 55 ... Clutch actuator, 56 ... Vehicle speed sensor, 58 ... Shift position sensor, 59 ... Gear shift actuator, 60 ... Control unit.

Claims (1)

[Scope of utility model registration request] 1. A means for engaging and disengaging a mechanical clutch, a means for detecting a stroke position of the clutch, a means for detecting an accelerator opening, a means for instructing a half-clutch control mode when the vehicle is traveling at a slow speed, and these instructions. In an automatic clutch control device for a vehicle, which is sometimes equipped with a half-clutch control means for intermittently controlling the clutch between a half-clutch position and a fully-engaged position according to an accelerator opening degree, a means for detecting a vehicle speed and this vehicle speed have a predetermined value. An automatic clutch control device for a vehicle, comprising means for releasing the half-clutch control mode when the vehicle exceeds the threshold.