JPS59162338A - Control device of control valve for controlling idle running speed - Google Patents

Abstract

PURPOSE:To actuate a control valve for use of idle speed control to be completely opened further save electric power, by interrupting a control pulse signal to be transmitted to the control valve during the time a starter is operated. CONSTITUTION:A control valve (ISC valve) 32 for use of idle speed control is provided in a bypass passage provided in parallel to a throttle valve. During the operation of a starter, a starter signal, becoming high level voltage, causes a transistor in an ISC valve current cut circuit 112 to be turned on, maintaining a switching transistor 110 to be turned off. As a result, maintaining a power amplifier 104 to be continuously turned off, a control pulse signal fed to the ISC valve 32 from the power amplifier 104 is cut off, and the ISC valve 32 is completely fully opened. In such way, ensuring a flow of intake air during the operation of the starter, also electric power can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an idle rotation speed control valve that controls the bypass flow rate of intake air during an idle period.

In the idle rotation speed control device, a bypass passage is provided in parallel to the intake passage portion where the throttle valve is provided, and a control valve for idle rotation speed control (hereinafter referred to as rrsc) is provided.
It's called "ben". ) is provided in the bypass passage, and the opening degree of the SC valve is controlled by the control pulse signal, and the duty ratio of the control pulse signal is 20%, which is designed to fully open the SC valve. While the starter is operating, it is necessary to fully open the ISO valve to ensure the intake air flow rate, but the conventional control device for the SC valve uses a control pulse with a duty ratio of 20% when fully opening the SC valve. Sending a signal to the ISC valve.

However, the duty ratio of the control pulse signal to the ISC valve is set to 0.
Even if you operate the power amplifier as if it were to be set to %, a minute width pulse will be sent to the ISC valve, and the ISC valve will be
It may not be possible to open completely due to excessive energizing current being supplied.

An object of the present invention is to provide an ISC valve control device that can completely open the rsc valve.

In order to achieve this purpose, according to the ESC valve control device of the present invention, when the ISC valve is fully opened, I S CMa
Stop sending pulse signals.

As a result, power can also be saved by ceasing transmission of control pulse signals to the ISC valve.

The case where the control valve for controlling the idle speed is fully opened is when the starter is operating.

The present invention will be described in detail with reference to the drawings.

In FIG. 1, an air flow meter 2, a throttle valve 3, a surge tank 4, and an intake pipe 5 are provided in an intake passage 1 in this order from upstream. A fuel reconnaissance valve 6 is provided in each intake pipe 5 and injects fuel toward the combustion chamber 7. The combustion chamber 7 has a spark plug 10 and a cylinder head 12.
, cylinder block] 4, and piston 16. The mixture passes through the intake valve 18 and burns ￥l≦7
After combustion, it exits to the exhaust passage 22 through the exhaust valve 20. The supercharger 24 includes a compressor 26 provided in the intake passage 1 and a turbine 2 provided in the exhaust passage 22.
8, and the compressor 26 and turbine 28 are fixed to a common shaft. The intake bypass passage 30 connects the upstream side of the compressor 26 and the surge tank 4, and connects the rs
The c-valve 32 controls the cross-sectional area of the intake bypass passage 30. The exhaust bypass passage 40 is provided in parallel to the exhaust passage portion where the turbine 28 is provided, and its flow passage cross-sectional area is controlled by a control valve 42. Pneumatic actuator 44 controls the opening of control valve 42 in relation to the boost pressure delivered via passage 46 . When the boost pressure increases, the opening degree of the production valve 42 increases to increase the amount of exhaust gas released, which reduces the rotational speed of the turbine 28 and lowers the boost pressure. Throttle position sensor 48
detects the opening degree of the throttle valve 3, the rotation angle sensor 50 detects the crank angle from the rotation of the shaft 54 of the power distributor 52, the knock sensor 56 is attached to the cylinder block 14 to detect knocking, and the vehicle speed sensor 58 detects vehicle speed from the rotation of the output shaft of the transmission. ECU (electronic control unit) 6
0 receives input from each sensor, fuel injection valve 6 and IS
Controls CSC2O3.

In FIG. 2, the ECU 60 has RAM 64, ROM 66, and CP connected to each other by a bus 62.
It has U 68, input/output capos 1-70, 72, and output port door 4. CP tI 68 is CLOCK
Receives clock pulses from 76. Air flow meter 2
The analog output from is sent to multiplexer 80 via buffer 78. The multiplexer 80 selects the input point and sends it to the A/D converter 82, and the A/D converted data is sent to the input/output coupler 0. The output of the knock sensor 56 is passed through a band pass filter 84 to a peak halt circuit 8.
6 and an integrating circuit 88. peak holt circuit 8
6 and the outputs of the integrating circuit 88 are A/D[rho] converted by a [Delta]/1] converter 90 and then sent to the input/output coupler 0.

When knocking occurs, the output of the peak halt circuit 86 becomes larger than the output of the integrating circuit 88, that is, a predetermined times the average value of the output of the knock sensor 56. Pulses from the vehicle speed sensor 58 and the rotation angle sensor 50 are sent to the input/output coupler door 2 via a shaping circuit 92.

The rsc valve 32 receives a control pulse signal from the output port door 4 via the ii dynamic circuit 94.

FIG. 3 shows details of the drive circuit 94 of FIG. ■
The SC valve pulse signal 96 is sent to an F-V (frequency waveform-voltage) conversion circuit 98 . The triangular wave generation circuit 100 receives a 250'Hz control pulse signal from the output port door 4,
Generates a 250 Hz triangular wave. tB current outflow circuit 1
02, ISCSC from the emitter voltage of the power amplifier 104
The 2O3 energizing current is detected and a DC voltage proportional to the energizing current is sent to the individual difference amplifier circuit 106. The deviation amplification circuit 106 uses the output voltage of the current detection circuit 102 and the F-V converter 98.
If the deviation is large, compare it with the output voltage.

By the way, the current of SCSC2O3 is CPU68
The lower the calculated value is, the more the output voltage is increased.

The comparator 108 compares the output voltage of the individual difference amplifier circuit 106 and the output voltage of the triangular wave generation circuit 100, and only when the former exceeds the latter, the voltage is sent to the base of the high star 110.

The ISC valve 32 is connected at one end to a voltage terminal 111 of 10B and at the other end connected to the power amplifier 104 via a wire 113. ISC valve current cut circuit 11
The output terminal of 2 is connected between the output terminal of comparator 108 and the base of switching transistor 110.

■SCS main valve cut circuit 112 is starter signal line 115
The starter signal is input through the input 32 to fully open. A signal line 114 for fully closing the ISC valve connects the output port door 4 to the base of the switching transistor 110. Therefore IS
During the period when the crystal level voltage is being sent from the closed door 4 to the base of the switching transistor 110 via the signal line 114 for fully closing the C valve, the switching transistor 110
is maintained on, and the electric wire 113 is connected to the 'rsc valve 32.
Continuous direct current is supplied through the

Note that the ISC valve 32 is designed to reduce its opening degree as the energizing current increases.

The operation of this device will be explained.

When the starter is operating, the starter signal becomes a high level voltage, the transistor of the ISC valve current cut circuit 112 is turned on, and the ISC valve 3
The production pulse signal sent to the rsc valve 32 is cut off.
The energizing current becomes completely zero, and the IS and C valves 32 are completely opened. The control pulse signals also contribute to power savings. The starter signal is sent from the start terminal of the engine switch.

The period during which the starter signal is maintained at a low level voltage is I
The transistor of the SC valve '1-u flow cut circuit 112 is turned off, and the switching transistor 110 is turned off.
It turns on and off according to the output pulse signal of 08, and a control pulse signal is sent to the ISC valve 32 via the electric wire 113. Therefore, the ISC valve 32 is supplied with an energizing current proportional to the duty ratio of its control pulse signal. In addition, when the ISC valve 32 is fully closed like during the supercharging period, the ISC
Instead of setting the duty ratio of the control pulse signal to the valve 32 to 100%, a control bell current PIE is sent from the output port door 4 to the base of the switching transistor 110 via the ISC valve fully closing signal line 114. As a result, the power amplifier 104 is turned on continuously and the ISC valve 32 is supplied with a sufficiently large energizing current for full full IUJ.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of an internal combustion engine to which the present invention is applied;
Figure 2 is a block diagram of the ECU (electronic control unit), Figure 3
The figure is a detailed circuit diagram of the ISC valve drive circuit. 1...Intake passage, 3...Throttle valve, 30...
Intake bypass passage, 32... ISO valve, (IO...
ECLI, 112...ISC valve current cut circuit.

Claims (1)

[Scope of Claims] 1. A bypass passage is provided in parallel to the intake passage portion where the throttle valve is provided, and a control valve for idle rotational speed control is provided in the bypass passage, and the idle rotational speed is controlled by a control pulse signal. Is the duty ratio of the control pulse signal to the control valve for idle rotation speed control = 0% the opening degree of the control valve for idle rotation speed control? M+
In a control device for a control valve for idle rotation speed control that is designed to fully open the valve, when the control valve for idle rotation speed control is set to fully 00, it is necessary to send an excavation pulse signal to the control valve for idle rotation speed control. A control device for a control valve for idle rotation speed control, characterized in that the control valve for controlling idle rotation speed is stopped. 2. The control device according to claim 1, wherein the case where the idle rotation speed control control valve is fully opened is when the starter is in operation.