JPS6215881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle control device using a central processing unit. BACKGROUND ART Recently, electronic control of engines of vehicles, such as automobiles, has progressed, and improvements in fuel efficiency and reduction in pollution have been realized. A vehicle control device using a central processing unit is employed for such electronic control of an automobile engine. This vehicle control device reads program data, control data that differs depending on the type of vehicle, etc. from a memory that is stored in advance, and provides this data to a central processing unit. The central processing unit sequentially controls various actuators, electronic fuel injection devices, This system outputs a control signal for controlling an ignition device, etc., to constantly control the engine to an optimal operating state. Such vehicle control devices are usually modularized and installed in automobiles, so if the specifications such as the type of automobile or the exhaust gas regulation conditions differ,
It is necessary to incorporate a memory in which corresponding control data is stored into the vehicle control device in advance.
Therefore, it is necessary to prepare a vehicle control device incorporating a different memory for each automobile with different specifications, which leads to an increase in the manufacturing cost of the vehicle control device. Furthermore, once the specifications have been decided, the embedded memory cannot be easily replaced with something else, so if, for example, the exhaust gas regulation requirements are updated, the entire device must be replaced. However, the effort would be enormous. This invention was made in consideration of the above circumstances, and its purpose is to provide a vehicle control device that can be manufactured at low cost and that can easily handle changes in vehicle specifications midway through. It is about providing. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The figure is a block configuration diagram showing one embodiment of the vehicle control device of the present invention. As shown in the figure, this device includes a control section 11 fixedly attached to a vehicle, such as an automobile, and connectors 12a and 12b. 11 and an information section 13 that is detachably coupled to the information section 11. The control section 11
is the output of various sensors installed in various parts of the automobile that detect external air pressure, electronic fuel injection device valve opening, manifold pressure, gasoline fuel octane number, engine cooling water temperature, etc., as well as the output of the voltage setting circuit described later. A multiplexer 14 that selects and outputs an arbitrary one from among the above, and an A/D conversion circuit 1 that converts the output of this multiplexer 14 into A/D.
5. A central processing unit (hereinafter abbreviated as CPU) that processes digital signals output from the A/D conversion circuit 15 based on program data supplied in advance and control data including various control parameters necessary for engine control. )16, this CPU1
6, an interface circuit 17 generates a control signal whose pulse rise time, fall time, and pulse width are defined according to each resistance value of a resistance circuit, which will be described later; and an output of this interface circuit 17. The multiplexer 14,
A/D conversion circuit 15, interface circuit 17
and a stabilized power supply circuit 19 that generates a constant voltage to be applied to each of the drive circuits 18, and the output of the drive circuit 18 is supplied to various actuators, electronic fuel injection devices, ignition devices, etc. Movement is becoming controlled. The information section 13 includes a storage device 20 for storing program data and control data supplied to the CPU 16, a plurality of resistors 21... and a changeover switch 22.
a voltage setting circuit 23 that divides and outputs the output voltage of the stabilized power supply circuit 19 according to the type of fuel gasoline and engine type; The resistor circuit 25 is composed of a plurality of resistors 24 used to define the resistance. That is, the voltage setting circuit 23
and resistance circuit 25 are used to set flow factors such as fuel gasoline type, engine type, pulse width, etc. In a device configured as above, the CPU 16
reads the program data stored in the storage device 20 via the connectors 12a and 12b, and then executes the program and receives various sensor outputs converted into digital signals by the A/D conversion circuit 15. By reading the data, the current operating state of the engine is grasped, and by performing arithmetic processing based on the engine control parameters included in the control data, optimum values for engine control are determined. The interface circuit 17 generates a control signal based on the calculation result of the CPU 16. At this time, each constant of the pulse included in this control signal is determined by each resistor 2 in the resistor circuit 25.
It is defined by the resistance value of 4. Control signals output from the interface circuit 17 are transmitted via the drive circuit 18 to various actuators, electronic fuel injection devices,
The signal is applied to an ignition device, etc., and the engine is thereby controlled to be in an optimal operating state. Further, the output voltage of the voltage setting circuit 23 in the information section 13 is set depending on the type of fuel gasoline and the type of engine, and this output voltage is set by the connector 12a,
12b, multiplexer 14 and A/D
When given to the CPU 16 via the conversion circuit 15,
The CPU 16 specifies the control data storage address of the storage device 20 according to the digital signal. As a result, the CPU 16 performs optimal control according to the type of fuel gasoline used in the engine and the engine type. In such a device, the control unit 11 can be used uniformly even if the vehicle specifications, exhaust gas regulation conditions, etc. are different, so the overall manufacturing cost can be reduced due to the effect of mass production. I can do it.
The information section 1 also includes a storage device 20 for storing program data and control data, a voltage setting circuit 23 for setting various flow elements, and a resistance circuit 25.
3 is connected to the control unit 1 by the connectors 12a and 12b.
Since the information section 13 is made removable, it is possible to control automobiles with different specifications by replacing the information section 13 . Furthermore, even if the exhaust gas regulation conditions, etc. of a vehicle with the same specifications are updated during the process, it is extremely easy to deal with this, as it is only necessary to replace the information section 13 with one that complies with the new regulation conditions. can. It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various modifications can be made. For example, in the interface circuit 17, the rise and fall times of pulses are determined by the resistance values of the resistors 24 of the resistor circuit 25, but this is also determined by the capacitance of the capacitor. You can do it like this. As explained above, the vehicle control device of the present invention can be manufactured at low cost, and even if the specifications of the vehicle are changed during the process, it can be easily handled.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the vehicle control device of the present invention. 11 ...Control unit, 12a, 12b...Connector, 1
3... Information department, 14... Multiplexer, 15... A/
D conversion circuit, 16... central processing unit (CPU),
17...Interface circuit, 18...Drive circuit,
19... Stabilized power supply circuit, 20... Storage device, 23 ...
Voltage setting circuit, 25...resistance circuit.

Claims (1)

[Claims] 1. Fixedly installed in a vehicle, equipped with a central processing unit, and generates control signals to control the electronic fuel injection device, ignition device, etc. in the vehicle according to the outputs of various sensors installed in various parts of the vehicle. A control unit, an information unit that has means for setting program data, control data, and various flow elements required by the control unit and can be exchanged, and combines the control unit and the information unit. By connecting different information units to the control unit via the connector, it is possible to control electronic fuel injection devices, ignition devices, etc. in vehicles with different specifications using the same control unit. A vehicle control device characterized in that it is configured to perform the following operations.