JPH0545532Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an indicator display device for an automatic transmission that displays a select position so that the driver can visually confirm it.

(Prior Art) Conventionally, as an indicator display device for an automatic transmission that displays a select position detected by a switch signal from an inhibitor switch on an A/T indicator, for example, "Nitsun Service Bulletin No. 578" ” (June 1988; Nissan Motor Co., Ltd.
The one described on page C-26 of ``Published by Co., Ltd.'' is known.

(Problem to be Solved by the Invention) However, in the conventional device described above, the inhibitor switch and the A/T indicator were connected in turn, and the select position was displayed based on the switch signal. Since the select position information used for each control of the T control unit was taken in from the static port to which each select switch element of the inhibitor switch was connected, there were problems as listed below. .

The A/T indicator becomes a display section dedicated to select position information, cannot be used for other purposes, and cannot be displayed multiple times.

The static port for inputting select position information of the A/T control unit becomes a dedicated input port for the inhibitor switch, and cannot be used as a port with multiple functions.

The present invention has been developed focusing on the above-mentioned problems, and allows the A/T indicator to be used multiple times as a display section other than select position information.
An object of the present invention is to develop an indicator display device for an automatic transmission in which a port for inputting select position information of an A/T control unit can be used multiple times as another input port.

(Means for Solving the Problems) In order to solve the above problems, the automatic transmission indicator display device of the present invention is designed to display the select position detected by the switch signal from the inhibitor switch on the A/T indicator. In the automatic transmission indicator display device,
The A/T control unit that takes in the switch signal from the inhibitor switch as control information has a dynamic port to which at least each select switch element of the inhibitor switch is connected, and a select position determination port, and the A/T
The control unit has an indicator display control section, and the indicator display control section is connected to the A/
Interrupts inhibitor input processing during T indicator display processing, and during inhibitor input processing, determines the select position using the select position determination port and dynamic port, outputs the determined select position to the RAM address, and outputs the determined select position to the RAM address. At the time of T indicator display processing, the means is characterized in that it is a control section that displays on the A/T indicator based on RAM address selection position input information.

The A/T indicator normally displays the selected position, but if a request for fault diagnosis is received using the fault diagnosis switch, the A/T indicator displays the fault diagnosis data of the control system of the automatic transmission by displaying the address data. It may also be displayed.

(Function) When displaying the select position of the automatic transmission on the A/T indicator, the select position is determined using the select position determination port and the dynamic port in the indicator display control section in the A/T control unit, The inhibitor input process that outputs the determined select position to the RAM address is performed by interrupt processing, and the A/T indicator display process displays the select position on the A/T indicator based on the select position input information of the RAM address. It can be done.

Therefore, the A/T indicator is displayed based on the input information of the RAM address and is not directly related to the inhibitor switch, so for example,
If fault diagnosis data is input to the RAM address, it can be used as another information display section, such as displaying address data regarding the details of the fault using an A/T indicator.

Furthermore, except during inhibitor input processing, the dynamic port can receive port input from sources other than the inhibitor switch, so the dynamic port can be used as another input information port.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

First, the configuration will be explained.

FIG. 1 shows an indicator display device for an automatic transmission according to an embodiment, and shows a select position (P;
Parking position, R: Reverse position, N: Neutral position, D: Drive position, 2: 2nd speed fixed position, 1: 1st speed fixed position) with A/T indicator 2
It is a device to know the select position information of the automatic transmission by displaying the information on the automatic transmission.In addition, it is a device that can know the malfunction information of the input sensors and actuators in the electronic control system by displaying the address data by the A/T indicator 2. I am trying to make it possible.

The A/T control unit 3, which takes in the switch signal from the inhibitor switch 1 as control information, has a dynamic unit to which each select switch element of the inhibitor switch 1 is connected via a diode box 4, and to which failure diagnosis information is input. It has a port 5 and select position determination ports 6 and 7.

Then, the A/T control unit 3 interrupts the inhibitor input processing during the A/T indicator display processing, and displays it on the A/T indicator 2 based on the information from the RAM address of the A/T control unit 3. An indicator display control program is included.

In addition to the ports 5, 6, and 7 mentioned above, the A/T control unit 3 is provided with a fault diagnosis port 9 to which a signal from a fault diagnosis switch 8, which is turned ON when displaying a fault diagnosis, is input.

Next, the effect will be explained.

(a) Select position display function In the indicator display control program of the A/T control unit 3, as shown in Fig. 2,
Processing frequency division is allocated to perform interrupt processing of inhibitor input processing during A/T indicator display processing.

During interrupt processing of inhibitor input, any one of the dynamic ports 5 is set to H level (HIGHT level), and the select position determination port 6 is set to H level so that the A/T indicator 2 is not displayed.

Then, the select position is determined by the select position determination port 7 becoming H level or L level (LOW level), and the determined select position signal is transmitted.
Output to RAM address.

During A/T indicator display processing, the selected position is displayed by lighting the lamp of the A/T indicator 2 corresponding to the selected position based on the selected position input information of the RAM address.

(b) Fault diagnosis data display function When the fault diagnosis switch 8 is turned ON and a fault diagnosis is requested, the fault diagnosis data of the input sensors and actuators in the control system of the automatic transmission is displayed from the dynamic port 5. The address data is input to the RAM address of the A/T control unit 3, and the address data is displayed by the A/T indicator 2 in different display patterns for distinguishing failure contents, as shown in FIG. 3, for example.

As explained above, the A/T indicator 2 is displayed based on the RAM address input information and is not directly related to the inhibitor switch 1 alone.
If you turn on and request trouble diagnosis,
When fault diagnosis fault diagnosis data is input to the RAM address, the A/T indicator 2 can be used to display address data of various fault details.

In addition, since the dynamic port 5 can receive input from sources other than the inhibitor switch 1 except during inhibitor input processing, the dynamic port 5 can be used as another input information port.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment, and any design changes that do not depart from the gist of the present invention are also included in the present invention. .

For example, in the embodiment, an example of using the dynamic port and the A/T indicator 2 as a failure data input port and a control system failure information display is shown as an example of use other than displaying the select position of the dynamic port and the A/T indicator 2. It may also be used as an input port and display for a transmission.

(Effects of the Invention) As explained above, in the automatic transmission indicator display device of the present invention, at least each of the inhibitor switches is provided in the A/T control unit that takes in the switch signal from the inhibitor switch as control information. It has a dynamic port to which a select switch element is connected and a select position determination port, and has an indicator display control section in the A/T control unit.
The indicator display control section interrupts inhibitor input processing during A/T indicator display processing, determines a select position using a select position determination port and a dynamic port, and outputs the determined select position during inhibitor input processing.
Since the means is characterized in that it is a control unit that outputs to the RAM address and displays on the A/T indicator based on the input information of the select position of the RAM address during the A/T indicator display processing,
The advantage is that the T indicator can be used multiple times as a display section for other than selected position information, and the port for inputting selected position information of the A/T control unit can also be used multiple times as another input port.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an indicator display device for an automatic transmission according to an embodiment of the present invention; FIG. 2 is a diagram showing an example of an allocation pattern for inhibitor input processing and A/T indicator display processing in the embodiment device; FIG. 3 is a diagram showing an example of display of failure diagnosis information in the embodiment device. 1...Inhibitor switch, 2...A/T indicator, 3...A/T control unit, 4...Diode box, 5...Dynamic port, 6, 7...Select position determination port, 8...Failure Diagnosis switch, 9...Fault diagnosis port.

Claims (1)

[Claims for Utility Model Registration] 1) In an indicator display device for an automatic transmission that displays a select position detected by a switch signal from an inhibitor switch on an A/T indicator, the switch signal from the inhibitor switch is The A/T control unit to be taken in as control information has at least a dynamic port to which each select switch element of the inhibitor switch is connected, and a select position determination port, and an indicator display control unit is provided in the A/T control unit. The indicator display control unit interrupts inhibitor input processing during the A/T indicator display processing, and during the inhibitor input processing,
The select position is determined using the select position determination port and the dynamic port, the determined select position is output to the RAM address, and the A/T
An indicator display device for an automatic transmission, characterized in that the indicator display process includes a control unit that displays information on an A/T indicator based on RAM address selection position input information. 2) The A/T indicator normally displays the select position, but when a request for fault diagnosis is received using the fault diagnosis switch, it displays fault diagnosis data for the control system of the automatic transmission by displaying address data. The indicator display device according to claim 1, wherein the indicator display device displays a display.