JPS59160025A - Supercharger controlling apparatus - Google Patents

Abstract

PURPOSE:To improve the perfromance of an engine, by enabling to control supercharging operation to meet the driver's requirement for acceleration by detecting the rate of change of the accelerator opening with time, and effecting or stopping supercharging operation according to the depression speed and the releasing speed of an accelerator pedal. CONSTITUTION:A control valve 6 is disposed in a by-pass passage 5' by-passing a compressor of a supercharger which is provided in an intake passage, and the control valve 6 is controlled by a control circuit. This control circuit includes comparators 17, 18 for comparing the depression angle of an accelerator pedal 10, i.e., the rate of change with time obtained by differentiating the accelerator opening respectively with reference values V1, V2 and a processing circuit 25 to which outputs of the comparators 17, 18 are furnished. The processing circuit 25 produces a supercharge effecting signal when the rate of change of the accelerator opening with time, i.e., the depression speed of the accelerator pedal is greater than the reference value V1 and produces a supercharge stopping signal when the releasing speed of the accelerator pedal is greater than the reference value V2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharger control device for supercharging engine intake air, and more particularly to a supercharger control device that accurately responds to vehicle acceleration requests. be.

Conventional supercharger control is performed in response to the position of the accelerator, so depending on the position of the accelerator, supercharging may not occur even though supercharging is necessary, or conversely, supercharging may not be necessary. However, there was a problem in which the supercharging did not stop.

Therefore, an object of the present invention is to solve the above problem, that is, to enable control that accurately detects the need for supercharging, such as during acceleration, and performs supercharging only in this case. . According to this purpose, in the control device of the present invention,
By detecting the rate of change over time of the accelerator opening degree, the necessity of supercharging or the necessity of stopping supercharging is determined, and a corresponding control signal is output.

That is, the supercharger control device according to the present invention has the following features:
means for detecting a rate of change over time of the accelerator opening; a comparison means for receiving a signal representing the rate of change over time of the accelerator opening from the detection means; and a comparison means for comparing the input signal with a predetermined value; Comparison calculation processing means comprising a complete calculation processing circuit for processing the signal of the comparison calculation processing means, and means for driving a mechanism for controlling the supercharging action of the supercharger according to the signal from the comparison calculation processing means, The comparison calculation processing means generates a supercharging signal when the temporal rate of change in the accelerator opening reaches a predetermined value;
The present invention is characterized in that the signal is turned off a predetermined time after the start signal is generated.

In this device, the means for detecting the rate of change over time of the accelerator opening is composed of a fine circuit composed of a potentiometer and a capacitor that are linked to the accelerator, and the comparison and arithmetic processing circuit of the comparison arithmetic processing means is composed of an operational amplifier and a logic circuit. The driving means of the supercharging control mechanism can be composed of, for example, a solenoid mechanism that opens and closes a throttle provided in a bypass passage parallel to the supercharger.

The supercharger control device configured in this way is
Regardless of the position of the accelerator, if the accelerator is depressed faster than a predetermined value, the output of the differentiating circuit becomes a predetermined value or more, and the comparison calculation circuit generates a signal to operate the drive circuit for a predetermined period of time. For this reason, the supercharger bypass throttle is closed to a predetermined degree, and supercharging is started and maintained for a predetermined time by means such as a timer, and then turned off.

Furthermore, when it is necessary to stop supercharging, a sudden accelerator pedal depression (release) is generally performed, but in the present invention, when the accelerator pedal depression speed (release velocity) exceeds a predetermined value, It is possible to detect this and generate a supercharging stop signal.

The degree of supercharging (throttle opening degree) after the start of supercharging is controlled by separately known means in accordance with the amount of depression of the accelerator pedal and the like.

Although the above device indirectly increases the supercharging effect by closing one throttle in the bypass circuit, it is also possible to use other supercharging throttle mechanisms. It is also possible to control it.

According to the above configuration, the supercharger responds not to the position of the accelerator pedal but to the rate of change in the accelerator opening, which not only reliably satisfies the driver's acceleration request but also improves fuel efficiency. can.

Embodiments of the supercharger control device according to the present invention will be described below with reference to the accompanying drawings.
- Describe Yaja's related equipment. In FIG. 1, a compressor 3 and a carburetor 4 are arranged in sequence between an air cleaner 1 and an engine 2, and a passage 5 between a compressor t3 and a carburetor 4 is connected to a control valve 6 and a relief valve 7.
The compressor 3 is connected to the atmosphere through a belt 8 and is constantly driven by the engine 2 through a belt 8. When supercharging is not required, the valve 6 is opened to release the compression pressure of the compressor 3, and when supercharging is required, the valve 6 is closed depending on the degree of supercharging.

The intake system shown in Figure 2 consists of air cleaner height 1 and engine 2.
This is a pre-carburetor type in which the vaporizer 4 and compressor 3 are placed between the two. The compressor 3 is rotationally driven via a belt 8 and a clutch 9. When supercharging is not necessary, the valve 6 in the bypass pipe 5' is opened, but when supercharging is necessary, the bypass pipe 5' is controlled to be closed by the valve 6.

In FIG. 3, an accelerator pedal 10 is interlocked with a rotating shaft 12 of a potentiometer 11.

When the pedal 10 is depressed, for example, a rack-binion mechanism (
(not shown) rotates counterclockwise in the figure.

As shown in the figure, one of the fixed terminals of the potentiometer 11 is grounded, and the other is applied with a power supply voltage of 10 VDD, so that a voltage proportional to the depression angle θ is output to the sliding contact.

Junction point 15 of voltage dividing resistors 13 and 14 and potentiometer 1
A capacitor 16 is connected between the capacitor 16 and the resistor 14, and a differential circuit is formed by this capacitor 16 and the resistor 14, and the voltage VDD/
2 and a voltage proportional to the time rate of change of the pedal depression angle (
voo H) occurs.

The next-stage comparison circuit includes a first comparator 17 and a second comparator 18. The above Van/2+6t is applied to the inverting input terminal of the first converter dθ resistor 17, and the voltage Vl (Vl > ■DD/2) divided by the connecting resistors 19 and 20 is applied to one non-inverting input terminal. ing. Therefore, as shown on the left side of FIG. 2, when the pedal depression speed is high and VDD/2+10÷ is larger than Vl, the output of the first comparator 17 changes from the H level to the L level.

On the other hand, dθ VDD , i' 2 + "T'T is also applied to the inverting input terminal of the second comparator 18, and the voltage V divided by the resistors 21 and 22 is applied to one non-inverting input terminal.
2 (<VDD/2) is applied. For this reason, the accelerator pedal release speed is greater than the constant speed (, VDD/2d
When θ +1 becomes lower than V2 as shown on the right side of Figure 4,
The output of the second comparator 18 changes from L level to H level.

Although the second comparator 18 is also shown in FIG. 3, this second comparator can be omitted when the drive signal is deenergized only by timer control, which will be described later.

The logic operation circuit 25 to which the output terminals of the first and second comparators 17 and 18 are input is for executing the program shown in FIG. One shot multi circuit 26
and a gate circuit 27.

There are two one-shot multi-circuits 26 (y
) Consisting of NAND circuits 26a and 26b, when an L-level pulse is input to the trigger input terminal, the H-level pulse is sent to the next stage gate circuit 27 during a period fixed by the time constant of the resistor 26C and capacitor 26d. Output.

The output of the second comparator 18 is input to the other input of the gate circuit 27 .

A pulse is output from the logic operation circuit 25 for a certain period of time after the pulse is output from the one-shot multi-circuit 28, but during this period a pulse is output from the second comparator 18, and no pulse is generated at the output end.

The drive circuit provided at the next stage includes a switching transistor 30 whose base is connected to the output terminal of the logic operation circuit 25, a solenoid 31 connected in series to the collector of the transistor 30, and movement caused by the activation of the solenoid 31. The core 32 is connected to an arm 3G fixed to a shaft 35 rotatably supporting the throttle 34 of the control valve 6 in the bypass pipe 5' as shown.

Therefore, when a pulse is applied to the base, transistor 30 becomes conductive and solenoid 31 is energized in a corresponding and controlled manner by a predetermined amount, so that core 32 is attracted and throttle 3
4 rotates in the direction of the bypass pipe 5'l'lL. Therefore, the winding action of the supercharger becomes high.

That is, if the depressing speed of the accelerator pedal IO is equal to or higher than a predetermined value, the throttle 34 is closed for a predetermined period of time due to the circuit operation described above, and supercharging is performed, and if the accelerator pedal 10 is released at a predetermined speed or higher during this time, - Supercharging is stopped regardless of the period specified in F.

Further, depending on the case, the second comparator 18 and the gate circuit 27 of the arithmetic processing circuit 25 may be omitted so that supercharging can be stopped only by the timer circuit.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams showing an intake system provided with a supercharger, FIG. 3 is a circuit diagram showing a supercharger control device according to the present invention, and the fourth factor is the first and second A waveform diagram showing the waveform applied to the input terminal of the operational amplifier of the comparator, Fig. 5 is a circuit diagram showing an example of the arithmetic circuit of Fig. 1, and Fig. 6 is a flow diagram showing the program executed in the arithmetic circuit. It is Y-1. 10...Accelerator pedal 11...Potentiometer 17...First co/parator 18...Second comparator 25...Arithmetic processing circuit 30 ...Switching transistor 31...
... Solenoid 33 ... Bypass pipe 34 ... Throttle Applicant Aisin Seiki Co., Ltd. Representative Patent Attorney Asahi Kato Figure 4 IP-5 Figure 5 Figure 6

Claims (1)

[Claims] 1) A means for detecting a temporal rate of change in the accelerator opening, a signal representing the temporal rate of change in the accelerator opening from the detecting means is input, and the input signal is compared with a predetermined value. and a comparison calculation processing means comprising a comparison means for calculating and processing a signal from the comparison means, and a mechanism for controlling the supercharging action of the supercharger by the signal from the comparison calculation processing means. and the comparison calculation processing means generates a supercharging signal when the temporal rate of change of the accelerator opening reaches a predetermined value;
A supercharger control device characterized in that the supercharging signal is cut off a predetermined time after the supercharging signal is generated. 2) The apparatus according to claim 1, wherein the comparison calculation processing means generates the supercharging start signal when the rate of change in accelerator opening reaches a predetermined positive value. 3) The device according to claim 1 or 2, wherein the arithmetic processing means generates a supercharging start signal when the temporal rate of change of the accelerator opening reaches a predetermined negative value.