JPH066292Y2 - Automatic transmission for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of an automatic transmission for a vehicle.

[Conventional technology]

In recent years, in order to reduce driver fatigue, Japanese Patent Laid-Open No. 59-18 has been proposed.
As described in Japanese Patent No. 5450, an increasing number of vehicles are equipped with an automatic transmission that automatically controls shift positions. When a shift position is commanded by a selector, a conventional device of this type can automatically control the shift position according to this command.

However, in the conventional device, the clutch is always operated in a half-clutch state when the vehicle is traveling at a very low speed such as when the vehicle is generally started and traveling on a congested road, and thus the clutch is easily worn. There was a problem.

[Problems to be solved by the device]

The present invention has been made in view of the above conventional problems,
An object of the present invention is to provide an automatic transmission for a vehicle that can prevent clutch wear even when traveling at a very low speed as frequently as traveling on a congested road.

[Means for Solving the Problems]

To achieve the above object, the structure of an automatic transmission for a vehicle according to the present invention is a vehicle automatic transmission for automatically controlling a shift position to detect a vehicle speed and an accelerator opening for detecting an accelerator opening. When the accelerator pedal is stepped on, the accelerator pedal is released once, and the clutch is disengaged, the accelerator pedal is stepped on again when the vehicle speed is equal to or higher than the fine speed set value. And a clutch control means for operating the clutch in a half-clutch state only for a predetermined time.

[Action]

After the accelerator pedal is turned on / off and the clutch is disengaged, if the accelerator pedal is stepped on again when the vehicle speed is equal to or higher than the slow speed setting value, the clutch should be operated in the half-clutch state only for a predetermined time. When the vehicle is traveling on a congested road, the half-clutch is used for a shorter period of time, and therefore the clutch is less worn even if the vehicle is traveling at a slight speed frequently in the half-clutch state.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a preferred embodiment of the present invention. In the figure, an engine 10 includes an engine speed sensor 1 for detecting an engine speed from a crankshaft, for example.
2 and a governor actuator 14 for operating the governor control lever of the fuel injection pump. Further, the transmission 16 is equipped with a vehicle speed sensor 18 for detecting a vehicle speed from the transmission output shaft, a shift position sensor 20 for detecting a shift position of the transmission, and a shift change actuator 22 for performing a shift operation of the transmission. There is. Further, the crank 2 that connects the engine 10 and the transmission 16
4 is the clutch 24 based on the clutch stroke amount.
Clutch stroke sensor 26 for detecting the connection or disconnection state of the clutch and the clutch actuator 2 for driving the clutch.
8 are provided. Further, 30 is a shift selector for designating a shift position, 32 is an error lamp for displaying an error when an error occurs during shift change control, 3
Reference numeral 4 denotes an accelerator opening sensor that detects the accelerator opening according to the amount of depression of the accelerator pedal. The detection output of each sensor is connected to the control unit 36.

Control unit 36 as clutch control means
Is a unit for controlling a series of shift change operations and has the following functions. That is, a shift change control function that determines and controls a shift change based on a shift change request from the shift selector 30 and a synchronization determination function that performs a synchronization determination based on each signal from the vehicle speed sensor 18 of the engine speed sensor 12. And a transmission operation function for driving and controlling the shift change actuator 22, a clutch control function for actuating and driving the clutch actuator 28 at the time of shift change in normal traveling and when moving from traveling to stop, and operation control for the governor actuator 14. It is equipped with an engine control function to operate. As a clutch control function, when the accelerator opening is larger than a set value (for example, 5% or more) and the vehicle speed exceeds a fine speed set value (for example, 5 km / h), the clutch is in a half-clutch state, and the vehicle runs at a low speed, When the vehicle speed becomes equal to or higher than the slight speed set value and the accelerator pedal is stepped on again, the accelerator opening is equal to or larger than the set value (for example, 5%), and the clutch is operated in the half-clutch state only for a predetermined time.

Next, the operation of the clutch control function in the automatic transmission having such a configuration will be described with reference to the flowchart of FIG. 2 and the characteristic diagrams of FIGS. First, the accelerator pedal is turned on (step 100), the clutch is connected (step 101), the clutch is engaged, the accelerator is turned off (step 102), and the clutch is disengaged (step 103). Based on the output of the vehicle speed sensor 18 after the clutch is disengaged, it is determined whether or not the vehicle speed has reached a fine speed set value (for example, 5 km / h) or more (step 104). That is, it is determined whether or not the vehicle speed becomes equal to or higher than the fine speed set value (5 km / h) after the clutch 24 shifts from the connection operation to the disconnection operation. Then, the accelerator pedal is operated when the vehicle speed is equal to or higher than the fine speed setting value (5 km / h) (step 106), and when the accelerator opening is equal to or higher than the setting value (for example, 5%) as shown in FIG. 28 is operated to bring the clutch into a half-clutch state (step 108). After this, it is judged again whether or not the vehicle speed has become equal to or higher than the slow speed set value (step 1
10) As shown in Fig. 3, the vehicle speed is set to a very low speed (5km /
In the case of h) or more, the clutch 24 is continued in the half-clutch state, and the process proceeds to step 112. In step 112, if it is determined that the accelerator opening is equal to or greater than the slight speed set value and the clutch has passed 5 seconds in the half clutch slight speed state as shown in FIG. 5, the clutch is shifted from the half clutch state to the disengagement operation (step 114), the processing of this routine is completed. When the vehicle speed becomes equal to or lower than the slight speed set value, all the processes for putting the clutch in the half-clutch state are released, the clutch is disengaged, and all the processes in this routine are completed.

[Effect of device]

As described above, according to the present invention, after the accelerator pedal is turned on / off and the clutch is disengaged, when the accelerator pedal is stepped on again when the vehicle speed is equal to or higher than the fine speed set value, the clutch is released for a predetermined time. Since it is operated in the half clutch state, the usage time of the half clutch during traveling on a congested road is shortened, and it is possible to prevent the clutch from being worn even if frequent low speed running in the half clutch state is performed, An excellent effect that it can contribute to the improvement of the durability of the clutch is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of the device according to the present invention.
FIG. 3 is a diagram showing the relationship between time and vehicle speed, FIG. 4 is a diagram showing the relationship between time and clutch stroke, and FIG. 5 is a diagram showing the relationship between time and accelerator opening. 12 ... Engine speed sensor, 18 ... Vehicle speed sensor,
20 ... shift position sensor, 22 ... shift change actuator, 26 ... clutch stroke sensor, 2
8 ... Clutch actuator, 34 ... Accelerator opening sensor, 36 ... Control unit.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. In an automatic transmission for a vehicle that automatically controls shift positions, a vehicle speed detecting means for detecting a vehicle speed, an accelerator opening detecting means for detecting an accelerator opening, and outputs of the detecting means are monitored. , Once the accelerator pedal is depressed and the accelerator is released again, and the clutch is disengaged,
An automatic transmission device for a vehicle, comprising: clutch control means for operating the clutch in a half-clutch state only for a predetermined time when the accelerator pedal is stepped on again when the vehicle speed is equal to or higher than the slow speed set value.