JPS58200054A - Fuel controlling device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To make it possible to decrease the number of input and output terminals of the controlling device by using a serial-out type A/D converter for converting an analog signal according to the parameter of the internal-combustion engine into a serial-type digital signal. CONSTITUTION:The output signals from a suction air temperature sensor 10, a throttle opening degree sensor 13, a cooling water temperature sensor 15, an O2 sensor 16, and a battery voltage sensor 17, which produce analog signals, are supplied to a serial-out A/D converter 4. In this A/D converter, the thus supplied analog signals are converted into digital signals and produced serially. Since the output signal from the A/D converter 4 is applied serially to the controlling device 1, the input and output terminals of the controlling device may be enough by a small number. By this arrangement, the input and output terminals may be sufficient even if they are provided in small numbers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement to a fuel control system for internal combustion.

Figure 1 Company's conventional solvent control device for internal combustion engines 0111
1 An example of the JII method is shown, where l represents the various mechanisms of the engine.
The control device takes in the input signal [7], amplifies the result of the performance according to this, and sends it to the fuel control signal a and the fuel supply device in the chest.2 is the input signal to the control device ll. Convert my analog input signal to a digital signal,
This digital signal is applied as a parallel digital signal C to the control device i1 by a parallel out type analog/digital converter (hereinafter referred to as an AD converter). or,
d Digital input signal to control device l, e is control device WI
This is a control signal from t1 to the AD converter 2. However, in the above-mentioned conventional system, since the four parallel digital signals C are applied to the control devices Wt and l, many input/output terminals of the control device all are occupied by this signal, and in a system that handles a large number of input/output signals, This resulted in a situation where there was a shortage of input/output terminals, and the device 11 became large and expensive.

In addition, in the ADTE device 2 of the normal + parallel out type, the analog input signal is first compared with the reference voltage corresponding to the highest pit (1), and then the difference voltage with this reference voltage is used as the reference voltage corresponding to the next pit. 1.7 so that the output corresponding to each bit output serially (binary signal of o, 1) is latched and output to the motherboard.
The ADi converter 2 itself has a complicated configuration and is large in size.
It became a price.

For this reason, conventionally, a control system as shown in Fig. 2 has been used, in which a parallel digital signal C output from an AD converter 2 is inputted, and this is converted into a serial digital signal fKf to be sent to a control system. A parallel-to-serial converter added to #1, from gld control device i1 to
This is a control signal applied to the parallel serial converter 113. In this conventional example, a serial digital signal f is sent from the motherboard serial converter 3 to the control device 1.
Although the control device 1 does not require many input/output terminals, it is necessary to have a complicated ADR converter 2 and a dedicated serial conversion device 113. However, the structure was complicated, large, and expensive.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a fuel control device for an internal combustion fuel combustion engine that is simple in construction, small in size, and inexpensive.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 3.4, 4 is a serial output type ADi that converts the analog input signal to the control device 111 into a digital signal and serially outputs this digital signal.
The output of the converter is applied to the control device 1rlK as a serial digital signal f. h is from the control device 111 to AD
This is a control signal applied to the i-switcher 4. 5 is an internal combustion engine driven by igniting and exploding a mixture of air and fuel; 6 is an intake pipe connected to the internal combustion engine 5; 7 is an intake air amount sensor that measures the amount of intake air flowing into the intake pipe 6; 8 is a throttle valve provided in the intake pipe 6, 9 is a pressure sensor that measures the pressure inside the intake pipe 6, 1o is an intake air temperature sensor that measures the intake air temperature, and 11 is the starting trajectory of the internal furnace engine 5. 13 is a throttle opening sensor that measures the rotation speed of the throttle valve 8; 15 is a rotation speed sensor that measures the rotation speed of the 14-cylinder internal combustion engine 115; A water temperature sensor 16 measures the cooling water temperature of the internal combustion engine 5; 02 sensor 176 measures the residual oxygen concentration after the explosion of the internal combustion engine 5;
A voltage sensor that measures battery voltage, 18 is a control device 1
1 is a fuel supply device that controls the fuel supply lid to the internal combustion engine 5 by a fuel control signal a from 6. The main meter is detected by each sensor and switch [Analog signals of this detection signal, that is, the outputs of each sensor 10, 13, 15 to 17, are input to the serial output type ADf converter 4 and the detection signal is Of these, the digital signal d is input to the control device kl. A
In the Df converter 4, the input analog signal is converted into a digital signal and serially output. Since the output signal ft of this ADi converter 4 is applied to the control device IIK serial, the number of input/output terminals of the control device fil may be small. The control device 11 performs operational amplification according to these input signals, and outputs fuel control I and other signals according to the results. The fuel supply system all 8t'i receives this fuel control signal a, and in response, the supplied fuel sound is controlled so that the internal combustion engine 5 has a desired air-fuel ratio.

As described above, in the fuel control device for an internal combustion engine according to the present invention, the analog signal among the input signals to the control device corresponding to the parameters of the internal combustion engine is converted into a digital signal by the analog-to-digital converter, and the Signals are serially input to the control device. For this reason, the control device has fewer input/output terminals, and the circuit configuration is simple, making the device smaller and cheaper.The analog-to-digital converter can also be a serial output type, eliminating the need for a latch mechanism. Therefore, the analog-to-digital converter can also be made small and inexpensive.

[Brief explanation of the drawing]

1 and 2 are diagrams explaining the control system of two conventional examples of the fuel control device for an internal combustion engine, and FIGS. 3 and 4 are diagrams explaining the control system and the configuration of the fuel control device for the internal combustion engine according to the present invention, respectively. . DESCRIPTION OF SYMBOLS 1... Control device, 4... Serial out type analog-digital converter, 5... Internal combustion Sakurajima, 18... Fuel supply device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 4

Claims (1)

[Claims] ...An analog-to-digital converter that serially outputs this digital signal converts the analog signal among the signals corresponding to the parameters of the internal combustion engine into a digital signal, and a digital signal among the signals corresponding to the internal combustion engine parameters is used. A control device that receives signals and the output of an analog-to-digital converter and outputs a fuel control signal according to these input signals, and a control device that receives a fuel control signal from the control device and controls internal combustion engine parameters. 1. A fuel control device for internal combustion III, comprising a fuel supply device that supplies a fuel sound corresponding to the above to an internal combustion engine.