JPH02180359A - Control device for electronically controlled automatic transmission - Google Patents

Abstract

PURPOSE:To disengage temporarily the control and prevent rise of oil temp. through auto-return even when the oil temp. has risen by judging temporary release of the mode on the basis of computational value due to information from sensor, judging whether returning is possible on the basis of computational value in the temporary disengaged condition, and thereby enabling control without using any oil temp. sensor. CONSTITUTION:An arrangement according to the present invention is equipped with an engine revolving speed sensor 3 and an input revolving speed sensor 1 incorporated in an automatic transmission, and on the basis of information therefrom the slip ratio in a torque converter 31 is determined, on the basis whereof temporary disengagement and its auto-return are made for the starting mode in the gear shift positions other than the 1st. This enables control without using an oil temp. sensor, and even in case the oil temp. has risen, the control is disengaged temporarily to be resumed after the return conditions are met. Thus a microcomputer 9 judges that the running is made with presumable oil temp. rise under the running conditions of A/T, and the control is disengaged temporarily and rise of oil temp. prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a control device for an electronically controlled automatic transmission, and particularly relates to a control device for controlling an oil temperature increase that occurs when starting in a gear with a high gear ratio other than l-speed. This relates to the release and return of control.

(Prior Art) In recent years, in order to start a vehicle smoothly on a snowy road, etc., starting is performed in a gear with a high gear ratio other than first gear. This is so-called wink mode control, and is often used in foreign countries.

(Problem to be solved by the invention) However, in the case of such wink mode control,
Oil temperature rise within 1m of automatic transmission (A/T) became a problem.
The oil temperature sensor or the like is used to detect this oil temperature rise and stop the control.

Therefore, if the A/T oil temperature rises, the control will stop, and if you want to perform the same control again, turn on the switch.
There were problems such as having to repeatedly switch off and on.

The present invention eliminates the above-mentioned problems and provides a control device for an electronically controlled automatic transmission that can automatically release and restore control due to a rise in oil temperature by simply selecting ON/OFF of a switch once. With the goal.

(Means for Solving the Problems) According to the present invention, in order to achieve the above object, in a control device for an electronically controlled automatic transmission that can select a starting mode at a gear other than 1st speed, the starting mode means for calculating, by an electronic i-control device, a state in which the oil temperature of the transmission is equal to or higher than a permissible value based on information from the sensors (1, 3);
Means for determining whether to temporarily cancel the mode based on the calculated value is provided, and means for determining whether or not it is possible to return to the mode based on the calculated value in the temporarily canceled state is provided.

In particular, the input rotation speed sensor (1) built into automatic transmissions
and an engine rotation speed sensor (3) are installed, and based on this information, the slip rate of the torque converter (31) is determined, and based on that, the start mode is temporarily canceled in gears other than 1st gear, and the start mode is automatically returned. This is how it was done.

(Operation and Effects of the Invention) According to the present invention, it is possible to perform the same control as before without using an oil temperature sensor, and even when the oil temperature rises, the control is not stopped but temporarily control can be resumed after the return conditions are met.

(1) Regarding oil temperature rise, the microcomputer determines that the A/T driving conditions indicate that the oil temperature is expected to rise, and temporarily cancels the control to prevent the oil temperature from rising. .

(2) For automatic recovery, the on/off of this 11 fil mode is detected by the alternative switch,
A microcomputer determines the conditions under which the oil temperature would have decreased from the temporarily released state, and control is automatically restarted after the conditions are met.

In the above description, each element is given a reference numeral for convenience of explanation, but these do not limit the configuration of the present invention.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a configuration diagram of the YSM system of an electronically controlled automatic transmission showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing its hydraulic control device, and Fig. 3 is the operation of the electronically controlled automatic transmission. 4 are diagrams showing the gear stages of the electronically controlled automatic transmission and the operating states of the clutch and brake.

In these figures, l is an input rotational speed sensor built into the transmission, which detects the rotational speed of the drum 33 of the Cl clutch. Reference numeral 2 denotes an output rotation speed sensor built into the transmission, which detects the rotation speed of the large output gear 67. 3 is an engine speed sensor, 4 is a shift position sensor, 5 is a throttle sensor that detects the opening of the throttle, and 6 is a wink mode switch.

Outputs from each sensor and switch described above are read into the electronic control device 7. This electronic control device 7 includes an interface circuit 8 , a microcomputer 9 , and a drive circuit 11 . It is composed of a drive circuit 12 that drives the second shift solenoid 17, a drive circuit 13 that drives the third shift solenoid 18, a drive circuit 14 that drives the lock-up solenoid 40, and a drive circuit 15 that drives the failure warning device 20. Ru. here,
Although not shown, the microcomputer 9 is equipped with a central processing unit H (cpU), a ROM for storing programs and fixed data, and a RAM for storing primary data for calculation and control. Various data to be referenced are stored in advance.

It also has a timer function and includes a pulse generation circuit 9a for duty control.

Further, as shown in FIG. 2, the hydraulic control device of the present invention has the following features:
Torque converter 31, lock-up clutch 32, data bypass valve 66, lock-up control valve 34, oil pump 35, pressure relief valve 36, secondary valve 37, primary regulator valve 38, solenoid control valve 39,
Lock-up solenoid 40, throttle control valve 41, reverse inhibit valve 42, manual valve as, Bz relay valve 44, CO inhibit valve 45, C3 relay pulp 46, C3 control solenoid 47, CO control valve 51, C
O control solenoid 52, CO damper 53, solenoid module valve 54, strainer 55, Bl
Control valve 56, Bl control solenoid 57, B1 damper 58, C1 accumulator 60. C3
timing valve 61, C3 modulator valve 62,
It is composed of a B2 accumulator 64 and the like.

The operation of this automatic transmission is as shown in Figures 3 and 4. In the case of 1st speed, the Cl clutch, FO clutch, and F1 clutch operate as shown in Figure 3 (a). , the 03 clutch and B2 brake operate during coasting. In the case of 2nd speed, as shown in Figure 3(b),
The C1 clutch, B1 brake and FO clutch operate, and the 03 clutch operates during coasting. In the case of 3rd speed, as shown in Figure 3(c), the CO clutch, C1
The clutch, C3 clutch and FO clutch operate.

In the case of the fourth speed, as shown in FIG. 3(d), the CO clutch, Cl clutch, and B1 brake are operated. In the case of reverse, the C2 clutch and B2 brake operate as shown in FIG. 3(e).

FIG. 5 is a flowchart showing a control procedure for an electronically controlled automatic transmission according to an embodiment of the present invention.

First, perform initial settings (wink mode settings) (step ■).

Next, it is searched whether the wink mode is temporarily canceled, that is, whether the wink mode temporary cancellation flag is set in the memory of the microcomputer 9 (step 2).

As a result, if the wink mode is not temporarily released, it is determined whether the first mode switch is on by searching the memory of the microcomputer 9 (
Step ■).

As a result, if the first mode switch is not on, the winkmoby release condition is determined (step ■).

As a result, if the winkmoby release condition is not satisfied, third speed start is performed (step ■).

In step (2), if the wink mode is temporarily canceled, automatic return conditions are determined (step (2)).

As a result, if the automatic return condition is satisfied, a third speed start is performed (step 2).

If the automatic return condition is not satisfied in step (2), or if the wintermovie release condition is satisfied in step (2), the wink mode is temporarily canceled (step (2)).

If the first mode switch is on in step (2), a winter mode permission determination is made (step (2)).

As a result, if the wink mode permission judgment is established, 3
A quick start is performed (step ■), and if the wink mode permission determination is not established, a third speed start is not performed.

Next, the winkmoby release conditions will be explained.

This condition refers to a case where an unacceptable rise in oil temperature occurs due to transition to the wink mode, and corresponds to a case where the slip ratio of the torque converter exceeds a predetermined value.

Therefore, after shifting to the wink mode, the engine speed n from the engine speed sensor 3 and the input speed n of the transmission are read into the microcomputer 9, and the slip ratio is calculated. Here, the slip rate 5LIP is st, +p=(n*-n+)/n.

It is calculated as follows.

Therefore, it can be determined that an unacceptable rise in oil temperature occurs when the slip ratio S L I P exceeds a predetermined value A% (for example, 50%), so this is set as a condition.

The automatic return condition is to monitor this slip rate 5LIP and make sure that the slip rate 5LIP reaches a predetermined value B% (for example, 3
0%) or less, it can be determined that it will return.
This is a condition. However, it is desirable to provide hysteresis such that A%>B%.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of an electronically controlled automatic transmission showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing its hydraulic control device, and FIG. 3 is an operational diagram of the electronically controlled automatic transmission. Fourth
The figure shows the gear stages and operating states of the clutch and brake of the electronically controlled automatic transmission, and FIG. 5 is a control operation flowchart of the electronically controlled automatic transmission of the present invention. l...Transmission input rotation speed sensor, 2...Transmission output rotation speed sensor, 3...Engine rotation speed sensor, 4...
・Shift position sensor, 5... Throttle sensor, 6... Winter mode switch, 7... Electronic control device, 8... Interface circuit, 9... Microcomputer, 11-15... Drive circuit , 16...
First shift solenoid, 17... Second shift solenoid, 18... Third shift solenoid, 20...
・Failure warning device, 31...Torque converter, 32・
... Lock-up clutch, 33... C1 clutch drum, 34... Lock-up control valve, 35... Oil pump, 36... Pressure relief valve, 37... Secondary valve, 38...・
Primary regulator valve, 39... Solenoid control valve, 40... Lock-up solenoid, 41... Throttle control valve, 42...
...Reverse inhibit valve, 43...Manual valve, 44...B2 relay valve, 45...C
O inhibit valve, 46...C3 relay pulp,
47...C3 control solenoid, 51...C
O control valve, 52... CO control solenoid, 53... CO damper, 54... solenoid modulator valve, 55... strainer, 56...
...B1 control valve, 57...B1 control solenoid, 58...Bl damper, 60...C
1 Akie emulator, 61...C3 timing valve,
62... C3 modulator valve, 64... B2 accumulator, 66... Cooler bypass valve, 67
... Output large gear.

Claims (2)

[Claims] (1) In a control device for an electronically controlled automatic transmission that can select a starting mode in a gear other than 1st gear, the system determines, based on information from a sensor, that the transmission oil temperature in the starting mode is higher than an allowable value. A means for calculating by an electronic control device, a means for determining temporary release of the mode based on the calculated value, and a means for determining whether or not it is possible to return to the mode based on the calculated value in the temporary release state. A control device for an electronically controlled automatic transmission. (2) The control device for an electronically controlled automatic transmission according to claim 1, wherein the sensor detects an input rotational speed of the automatic transmission and an engine rotational speed.