JPH05215230A - Transmission control device - Google Patents

Abstract

PURPOSE:To read RAM data in the condition of loading a vehicle with a transmission. CONSTITUTION:A plural number of switches as an address assignment means 18 are set in parallel with the input circuit of a select position switch 16, and signals from these switches are alternately read by a control unit 10 through an interruption process. RAM data of an address set by the address setting means 18 is displayed on an external display unit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control device such as an automatic transmission or a continuously variable transmission.

[0002]

2. Description of the Related Art As a conventional transmission control device using a microcomputer, "NISSAN full-range electronic control automatic transmission maintenance manual RE
4R01A (issued by Nissan Motor Co., Ltd.) "I-21
Some are shown on the page. What this shows is
Data such as vehicle speed, throttle opening, oil temperature, etc. are input to the control unit, the solenoid operation is controlled based on the data, and the hydraulic pressure and gear shift of the automatic transmission are controlled.

[0003]

However, the conventional transmission control device includes a random access memory (RA).
Since a device for verifying the data of M) (data of vehicle speed, throttle opening, oil temperature, etc.) is not provided, there is a problem that it is not possible to determine whether or not an abnormality has occurred in the control unit. The present invention aims to solve such problems.

[0004]

The present invention solves the above problems by making it possible to display RAM address data on an external display device. That is, the control device for a transmission according to the present invention has address setting means for setting and inputting the RAM address of the control unit, and an external display device for displaying the RAM address data set by the address setting means.

[0005]

By operating the address setting means by a predetermined operation, the RAM address can be designated and displayed on the external display device. As a result, the RAM data of the transmission mounted on the vehicle can be displayed in real time, and it is possible to determine whether or not there is a problem with the control unit, and if there is a problem, this is due to the software. It can be verified whether it is due to hardware or due to hardware. By configuring the address setting means to interrupt the input of the select position switch, it is possible to eliminate the need for providing a special input circuit. Further, by using the digital clock of the vehicle as the external display device, it is possible to eliminate the need for a special device also for this.

[0006]

EXAMPLE FIG. 1 shows an example. A signal from a sensor switch 12 including a vehicle speed sensor, a throttle opening sensor, an oil temperature sensor, a kick down switch, an idle switch and the like is input to the control unit 10. Based on these signals, the control unit 10 shifts the solenoid, the line pressure control solenoid,
It is configured to control the operation of the solenoid 14 such as a lock-up control solenoid to control the hydraulic pressure and shift of the automatic transmission. A signal from the select position switch 16, that is, a signal indicating whether the select lever is in the P, R, N, D, 2 or 1 range is also input to the control unit 10. Address setting means 18 is provided in parallel with the input portion from the select position switch 16 to the control unit 10.
Is provided. The address setting means 18 is configured to specify an address by causing the control unit 10 to read a signal from now on by interrupt processing. The address setting means 18 is specifically composed of five switches. The five switches are provided in parallel with five of the six circuit lines of the select position switch 16. The signal from the select position switch 16 and the signal from the address setting means 18 are alternately read by the interrupt processing. That is, the select position switch 16
5 out of the 6 input circuits are used, 1 bit sets the upper or lower bits of the address, and the remaining 4 bits set the address. Further, the control unit 10 is connected to the external display device 20 from the serial port via the serial signal line. As the external display device 20, specifically, a display device of a digital clock provided in the vehicle is used. Therefore, in practice, a vehicle control unit is interposed between the control unit 10 and the external display device 20. When the RAM data is displayed on the external display device 20, R is set by setting the five switches of the address setting means 18 to predetermined states.
Set the AM address. Control unit 10
Reads alternately the input signal from the select position switch 16 and the set value from the address setting means 18 by interrupt processing. The read data of the designated address is sent to the external display device 20 through the serial signal line to display the data. This allows the control unit 10 to be installed with the automatic transmission mounted on the vehicle.
The operation of can be verified. Therefore, it is possible to immediately determine whether or not the control unit 10 has a defect, and when there is a defect, it can be determined whether this is due to software or hardware. The address data includes vehicle speed, throttle opening, oil temperature, solenoid duty ratio, and the like. Although the above embodiment is directed to a stepped automatic transmission, the present invention is also applicable to a continuously variable transmission.

[0007]

As described above, according to the present invention, the RAM data of the control unit can be displayed while the vehicle is equipped with the transmission. And, it becomes possible to immediately judge the content of the abnormality.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 10 control unit 16 select position switch 18 address setting means 20 external display device

Claims (3)

[Claims] 1. A control device for a transmission having a control unit for speed change control and hydraulic pressure control, which comprises a microcomputer, and an address setting means for setting and inputting a RAM address of the control unit, and a RAM address set by the address setting means. A control device for a transmission, comprising: an external display device for displaying data. 2. The transmission control device according to claim 1, wherein the address setting means is provided in parallel with the input circuit of the select position switch, and the setting input signal is read by interrupt processing. 3. The transmission control device according to claim 1, wherein the external display device is a display device of a digital clock provided in the vehicle.