JPS62247401A - Controlling device for vehicle - Google Patents

Abstract

PURPOSE:To extremely decrease the types of ROM and to facilitate the easy check and control of the ROM by storing plural different control programs in a single ROM and selecting these programs in response to the change of the analog input voltage. CONSTITUTION:The control procedure and data of a ROM 8 are divided into a common part for plural device types and programs (device types A and B). A microprocessor 3 reads the input potential of an A/D converter 2 set previously immediately after a power supply is applied. Based on this potential information, a program decided in response to an input level is selected out of those control programs of the ROM 8. Thus the processor 3 performs an operation is accordance with the selected control procedure and data and controls a solenoid valve, a motor, a lamp, etc., based on the result of said operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle control device that controls a vehicle engine, transmission, etc. using a microcomputer.

[Conventional technology]

FIG. 2 is a diagram showing the configuration of a conventional vehicle control device.

In the figure, 1 is an input circuit that inputs various on/off signals such as an idle switch, 2 is an AD converter that inputs various analog signals such as an air 70-sensor and a water temperature sensor,
3 reads various inputs through the input board and stores them in the ROM.
4 is a microprocessor that performs calculations according to the stored control procedures and data; 5 is a RAM that temporarily stores data during calculation processing; 6 is an output circuit connected to the output port of the microprocessor 3; ,motor,
Various loads such as lamps are connected.

Conventional vehicle control devices are configured as described above, and when controlling an automobile engine, transmission, etc. with such a control device, for example, for an engine, the displacement, vehicle type, exhaust gas regulation value, etc. engine displacement.

There are differences in reduction ratios, vehicle models, etc., and in the case of suspension control, there are differences in control content and setting data depending on the model, such as the presence or absence of vehicle weight and vehicle height control. For this reason, as shown in FIG. 3, ROMs 4 containing control procedures and data corresponding to each model were manufactured and used.

[The problem that the invention attempts to solve]

However, in the conventional device described above, each model has a different R.
In order to prepare the OMJ, there are many types of ROM 4, which increases the cost of checking and managing the ROM 4, and in the case of a mask ROM, there are problems such as an increase in mask production costs.

This invention was made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a vehicle control device that can easily check and manage the ROM and reduce costs.

[Means for solving problems]

The vehicle control device according to the present invention has versatility by storing a plurality of different control programs in one ROM, and also allows the input level of the AD converter to be variably set, so that the control program can be programmed by changing the analog input voltage. It is designed so that you can select.

[For production]

In this invention, the microprocessor reads the change in analog input voltage via the AD converter immediately after power is turned on to the control device, and selects and executes the control program in the ROM corresponding to this input voltage value.

〔Example〕

FIG. 1 is a diagram showing the configuration of a vehicle control device according to an embodiment of the present invention. 1 to 6 in the figure are similar to the conventional device shown in FIG. 2, so corresponding parts are given the same reference numerals and their explanation will be omitted. Reference numeral 7 denotes a variable resistor, one end of which is connected to the power supply and the input of the AD humperter 2, and the other end of which is grounded to provide a variable analog voltage according to the voltage division ratio of the resistors. Further, as shown in FIG. 4, the ROM 8 has its control procedures and data configured into common parts for a plurality of models and programs for each model (in this case, two types, model A and model B).

In the vehicle control device configured as described above, immediately after power is turned on, the microprocessor 3 reads the preset input potential of the AD humpter 2, and according to this information, the control program in the ROM 8 determines the predetermined value corresponding to the input level. Select the program that is displayed. Then, the microprocessor 3 executes calculations according to the selected control procedure and data, and based on the results, the solenoid valve, motor,
Control loads such as lamps.

In the above embodiment, the programs for a plurality of models built into the FiROM 8 were used for two models, but it goes without saying that this can be configured to support even more models.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of different control programs are stored in one ROM, and this control program is selected based on changes in the analog input voltage, so the number of ROM types can be significantly reduced. This has the effect of making it easier to check and manage the ROM, thereby reducing costs.

[Brief explanation of drawings]

FIG. 1 shows a control system for a vehicle according to an embodiment of the present invention.
Figure 3 is a diagram showing the configuration of the ROM of a conventional vehicle control device.
FIG. 4 shows R of a vehicle control device according to an embodiment of the present invention.
It is a diagram showing the configuration of OM. 2...AD converter, 3...Microprocessor, 7...Variable resistor, 8...ROM. In addition, the same symbols in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] At least microprocessor, I/O port, RO
In a vehicle control device equipped with an M and an AD converter, the input level of the AD converter can be variably set, and a plurality of different control programs corresponding to this input level are stored in one ROM, and when the power is turned on, the A vehicle control device characterized in that a microprocessor reads an analog input voltage via the AD converter, selects and executes a control program in the ROM corresponding to the input voltage value.