JPS6372923A - Clutch control device - Google Patents

Abstract

PURPOSE:To improve the warming-up characteristic of engine speed at a cold time by learning a half-connected clutch point and, then, disconnecting a clutch until a certain time elapsed when the water temp. is lower than a defined value, in the clutch control device of an electronically controlled automatic transmission. CONSTITUTION:When a water temp. sensor 5 as a detecting means for detecting the cooling water temp. of an engine 1 detects that the cooling water temp. is lower than a defined temp, a water temp. switch 10 is turned on, and, as the cooling water temp. rises, the water temp. switch 10 is turned off. A control unit 11 consisting of an electronic control device receives signals from the water temp. sensor 5, an engine rotation sensor 6, an input shaft rotation sensor 7, a clutch stroke sensor 8, and a select position sensor 9 and controls a select actuator 3a and a clutch actuator 4. The control unit 11 also has a timer 11a which is a time measuring means for measuring a time after the engine is started.

Description

Detailed Description of the Invention (#Field of Application of Rakudo) The present invention relates to a clutch control device in an electronically controlled automatic transmission, and particularly in cold weather, the clutch is held disengaged until the water temperature rises, and the engine speed increases. Prior art) In order to control the clutch mechanism of a single droplet control automatic transmission, learning of the fully engaged point and half-clutch point of the clutch has conventionally been carried out, and this learning is carried out as shown in Fig. 4. It is. That is, in Fig. 4, when the transmission is set to neutral gear and the key switch is turned on, the clutch is disengaged (a) and the clutch is engaged until the end (C). ), the clutch stroke after a predetermined time has elapsed is taken into a control unit consisting of an electronic control device as a complete contact learning value (Ll) (d), and the clutch is disengaged so that the input shaft rotational speed is below a predetermined value. (e) Next, the clutch is connected at low speed, and the half clutch position learning value is the clutch stroke when the engine rotation is transmitted and the difference between the engine rotation speed and the input shaft rotation speed becomes less than the predetermined rotation speed. (L2) into the control unit (f), and how to complete the learning is as follows.
A clutch control device is disclosed in Japanese Patent Application No. 61-19008.

(Problem to be solved by the invention) There is no problem in vehicles such as passenger cars, which have a small amount of transmission oil and low friction loss in mechanical parts, but in vehicles such as trucks, which have a large amount of transmission oil and are submerged in oil. In vehicles, where there are many mechanical parts that have high friction losses, the viscosity of the oil is high at extremely low temperatures of, for example, -20°C, and the transmission may become loose due to the clutch being engaged at the part (h) shown in Figure 4. Since the rotational load is large, the uphill characteristics of the engine will deteriorate. Since the engine is not warmed up sufficiently, there are adverse effects such as engine stalling.

Therefore, an object of the present invention is to maintain the clutch disengaged at extremely low temperatures after the completion of clutch learning at startup until a predetermined time has elapsed or until the water temperature rises to a predetermined value. The object of the present invention is to provide a clutch control device that attempts to improve the.

(Means for Solving the Problems) In order to achieve the first objective described in [1], according to the present invention, in a clutch control device that automatically controls the clutch by learning the clutch stroke value, the temperature state of the engine is controlled. A clutch control device is provided that includes a detection means for detecting the clutch and a control means for maintaining the clutch disengaged until the engine temperature reaches a predetermined value based on a signal from the detection means during the learning.

(Function) After starting the engine and learning the half-clutch point, the water temperature sensor detects the water temperature. If the water temperature is lower than a predetermined value, the clutch is held disengaged until a predetermined time elapses, or the water temperature rises. Hold the clutch disengaged until the water temperature switch turns off.

(Example) Next, the present invention will be described in detail with reference to the drawings.

Fig. 1 is a block diagram showing one embodiment of the clutch control device of the present invention, Fig. 2 is a graph showing clutch operation and related engine speed and input shaft rotation speed, and Fig. 3 is a control of this embodiment. It is a flowchart which shows an example.

In FIG. 1, l is the engine, 2 is the clutch, 3 is the transmission, 3a and 3b are the select actuator and shift actuator of the transmission, respectively, 4 is the clutch actuator that drives the clutch 2, and 5 is the engine. 1 is a water temperature sensor serving as a detection means for detecting the cooling water temperature, 6 is an engine rotation sensor, 7 is an input shaft rotation sensor, 8 is a clutch stroke sensor, and 9 is a select position sensor. Reference numeral 10 indicates a water temperature switch, which is turned on when the water temperature sensor 5 detects that the cooling water temperature is lower than a predetermined temperature, and is turned off when the cooling water temperature becomes low. 1
Reference numeral 1 denotes a control unit consisting of an electronic control device, which receives signals from various sensors to control various actuators, and also has a timer lla serving as a timer for measuring the time after the engine is started.

tαQl! rψ7I\u1-1-'+! υ*lfd+鴫j↓h2'-su-1id-ni A-f are operated in the same way as in the case of Fig. 4, but at point f, if the water temperature is lower than the specified water temperature, the clutch is not engaged. The clutch is disengaged as shown by g', the clutch is kept disengaged for a predetermined time Tl preset by the timer 11a as shown by h', and then the clutch is connected as shown by i. As a result, as shown by the dotted line A, the northward increase of the engine rotation becomes smooth, and the characteristic of the engine speed is improved.

Next, the control of the present invention will be explained with reference to the flowchart of FIG.

First, the timer 11a provided in the electronic control unit 11 is reset and the counter is made zero (step Sl). Then, based on the signal from the select switch 9, it is determined whether the select position is N (neutral) or not (step S2). First, in the case of neutral, starting of the engine is determined by the engine rotation sensor 6, and when the engine is starting, the learning operations a-f are performed (
Step S3), water temperature sweet on attack, 1000 is Nanka) 5
(step S5), and if it is on because the cooling ice temperature is low, 1 is added to the timer 1 of the timer lla (step S6), and then the counter (+(i)
It is determined whether or not is less than Tl (step S7), and if it is less than Tl, the clutch is disengaged (step S8).

If the select operation is not neutral in step S2, the process ends without performing the two-step flow, and if the engine is not starting in step S3, the
J operations mo, k, h are performed (step S10)
, Incidentally, in step S5, when the water temperature switch 10 is off, and in step S7, when the count is thicker than TI, it is considered that the ice temperature has risen sufficiently, so the operation g, i is performed (step S9), and the flow ends.

(Effects of Isuzu 1) As explained in detail above, Kizusu 1 is equipped with an engine coolant temperature sensor, so it senses when the coolant temperature is low and keeps the clutch disengaged after learning the half-clutch point. The clutch is kept disengaged until the water temperature rises after a predetermined period of time has elapsed using a timing device, and the clutch is engaged only after the water temperature has risen sufficiently, which has the effect of modifying the engine's revving characteristics in cold weather. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a clutch control device of the present invention;
Fig. 2 is a graph showing clutch operation and related engine speed and input shaft rotation speed, Fig. 3 is a flowchart showing an example of control of this embodiment, and Fig. 4 is a conventional clutch operation and related engine speed. It is a graph showing the rotation speed and the input shaft rotation speed. l...Engine, 2...Clutch, 3...Transmission, 3a...Select actuator, 4
...Clutch actuator, 5...Water temperature sensor,
6... Engine rotation sensor, 7... Input shaft rotation sensor, 8... Clutch stroke sensor,
9...Select position sensor, 10...Water temperature switch, 11...Control unit, lla...
・Timer. Patent applicant Isu? Jidosha Co., Ltd. Representative Patent Attorney Minoru Tsuji Bf!
g1 Figure 3

Claims (2)

[Claims] (1) In a clutch control device that automatically controls the clutch by learning a clutch stroke value, there is provided a detection means for detecting the temperature state of the engine, and a clutch control device that detects the temperature state of the engine and, at the time of said learning, uses a signal from the detection means to hold the clutch until the engine temperature reaches a predetermined value. What is claimed is: 1. A clutch control device comprising a control means for maintaining disconnection. (2) The clutch control device according to claim (1), wherein the increase in engine temperature to a predetermined value is controlled by a timing means.