JPS58197453A - Engine control semiconductor integrated circuit - Google Patents

Abstract

PURPOSE:To achieve one chip IC without increasing the chip size, by sharing a counter and a digital comparator with many registers thereby simplifying the circuit. CONSTITUTION:Information from various sensors for detecting the operating state is provided through the data bus DB to MPU1 and the necessary information is held by RAM2. The pulse signal formed through data processing in a microcomputer is set in the register group 4. The output signal from each register in the register group 4 is outputted in time sharing manner through a multiplexer 6. The output from a counter 5 is outputted in time sharing manner through a multiplexer 10. The digital comparator 7 will detect the matching between the outputs from the register and counter which is transmitted through a multiplexer 8 operating synchronously with the multiplexer 6 to a latch circuit 9.

Description

[Detailed description of the invention] The present invention relates to a semiconductor integrated circuit for engine control.

Automotive engineering/control systems using microcontrollers have been known for some time.

In this engineering/engine control system, one ignition timing,
A pulse output signal for controlling fuel injection timing or idle link adjustment is formed by comparing timing information calculated based on operating conditions with a predetermined time base and/or crank angle signal.

Conventionally, in forming the above-mentioned pulse output signal, the first
As shown in the figure, a register in which timing information is set and a digital comparator that receives the corresponding color/color output signals form a single pulse output signal. be. Therefore, when multiple pieces of timing information are considered to be 8 points in engine control, etc.,
The drawback is that the circuit becomes complex because a corresponding number of registers, registers, and comparators are required.

In particular, when the output circuit is built into a one-chip microcomputer, the amount of space it occupies becomes extremely large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conductive integrated circuit for engine control which is simplified in one circuit.

Another object of the present invention is to reduce the chip size and area.
The purpose of the present invention is to provide conductor integrated circuits for engine control.

Further objects of the invention will become apparent from the following description and drawings.

Hereinafter, this invention will be explained in detail together with examples.

FIG. 2 shows a block diagram of an embodiment of the invention.

Each circuit block surrounded by a dotted line in the figure is formed on a single conductor board by a known conductor integrated path technique. Although not particularly limited, the IC of this embodiment is configured by a CMO8m circuit.

One of the microprocessors, designated by the symbol l, performs various data processing through arithmetic and logical operations according to a predetermined program.

17) marked with symbol 2 is
Memory (hereinafter simply referred to as AM).

Data necessary for the above data processing is held.

What is indicated by symbol 3 is a read-only memory (hereinafter simply referred to as l-LOM), into which interpolated data determined by the above-mentioned data processing procedure and the program shown, as well as the characteristics of the engine to be controlled, are written. There is.

The above MPU1. ! :, RAM2, and ROM317) is performed using address bus AB and data bus DB.

Although not shown in the figure, information from each dan and 4/server that detects the operating state is transferred to the data bus DB1.
The necessary items are provided by MPLJl through R and AM.
2. In this case, the analog signal from the sensor is A/1) converted and input manually. This A
A /D converter is formed in the above IC, and i! L-connection analog data may also be input. Examples of the above-mentioned sensors include a cooling water temperature sensor, an engine rotation speed sensor, and a crank angle sensor.

An engine control signal 1 based on the data processing result in the above-mentioned microcomputer, for example, one ignition timing pulse, one throttle valve control pulse.

and electromagnetic fuel injection control pulses etc. are formed by each of the primary [gtI sweetfish].

Reference numeral 4 indicates a group of registers in which rise and/or fall timing information of a pulse signal to be outputted formed by data processing flK in the microcomputer is set.

What is indicated by the symbol 5 is a counter, which is constituted by, but not limited to, a tie-based forming counter and a crack angle signal forming collar/return.

The counter forming the time base receives and counts a predetermined clock formed by the MPUI. Also,
A counter forming the crank angle tn receives and counts a pulse signal corresponding to the crank angle formed by the sensor.

The output signal of each register in the register group 4 is as follows:
It is output in a time-division manner via the multiplexer marked with symbol 6. Further, the output of the color/reference signal 5 is outputted in a time-division manner via a multiplexer indicated by the symbol 10. The multiplexer 10 controls the time base and the time base depending on the pulse to be output. It transmits the crank angle signal.

7 is a digital comparator, which performs the comparison between the time-divisionally input register output and the color output.

This detection signal is transmitted to the latch circuit 9 through a multiplexer indicated by symbol 8 which operates in synchronization with the multiplexer 6 mentioned above.

The launch circuit 9 is a flip-flop FF or FFn.
Each has an output terminal OUT.

The above pulse signal is output from 0UTn to 0UTn.

In this embodiment, the counter and digital comparator are used as a common button for many registers, so that the circuit can be simplified. In addition, whether a multiplexer is newly installed or multiplexer iX.

For example, since it can be configured with one transmission gate (transmission gate) MOSFET (insulation gate field effect transistor), the increase is smaller than the reduction in the number of digital comparators mentioned above, resulting in a significant circuit simplification as a whole. You can make various plans.

In addition, with the simplification of the pulse output circuit, the micro combinator and the pulse output circuit can be integrated into one chip without increasing the chip size.
It has the advantage of being able to be converted into

The invention is not limited to the above embodiments.

Color/return (X, time base forming color/return input may also be used. In this case, the sensor output when the crank angle is 0° is used, and the time base is used to replace it with the crank angle. It's okay.

Further, an output driving circuit may be built into the IC of the above-described practical example.

Sarani, microcomputer section and the above register group 4
．． It is also possible to convert each pulse output circuit consisting of the counter/receiver 5 and the tit/tal comparator 7 into one chip IC.
But that's fine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of main parts showing an example of a conventional technique. Figure 2 V! , is a block diagram showing one embodiment of the present invention. 1...Microprocessor, 2.RAM, 3...R
OM, 4... register group, 5... counter, 6...
Multiplexer, 7... Ti/tal comparator, 8... Multiplexer, 9... Launch circuit, 10... Multiplexer. Agent Patent Attorney Susuki 1) Toshiyuki

Claims (1)

[Claims] 1. A counter that forms a predetermined time base and/or a crank angle signal, a register ** in which timing information of a pulse signal to be output is set, and the outputs of these registers are time-divided. a first multiplexer that receives the output signal from the first multiplexer and the output signal of the counter; and a digital comparator that receives the output signal of the digital comparator and forms a pulse signal to be output. t/l! is transmitted to multiple latch circuits in a time-sharing manner. , 2 multiplexers. 2. The above-mentioned counter includes a first counter that forms a time base, a second counter that forms a tilt angle signal, and the outputs of these counter circuits are time-divided according to the pulse signal to be output. and a multiplexer that transmits information to the digital comparator! M. The semiconductor integrated circuit for engine control according to item 1.