JPS5918227A - Controlling method of supercharger for automobile engine - Google Patents

Abstract

PURPOSE:To save the fuel cost by a method wherein a supercharger is driven when the operation of an engine is in its low and medium speed rotation zones and a passage bypassing the supercharge is closed so that the operation of the supercharger is limited accurately to the low and medium speed rotation zones of the engine. CONSTITUTION:A supercharger 14 is provided in an air intake passage 13 between an air cleaner 10 and a carburettor 11 and the driving shaft 19 of the supercharger 14 is removably connected to a pulley 17 rotated by the output shaft 15 of the engine through an electromagnetic clutch 18. Further, a bypass air intake passage 22 bypassing the supercharger 14 is provided in the air intake passage 13 and a constantly opened control valve 21 is interposed in the air intake passage 22. The electromagnetic clutch 18 and the control valve 21 are controlled by a control circuit 30. In other words, when the engine r.p.m. detected from the output of an engine r.p.m. sensor 31 is in the low or medium speed rotation zone of the engine, the electromagnetic clutch 18 is held in its connected condition and the control valve 21 is closed to thereby increase the supercharging pressure of the supercharger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a supercharger for an automobile engine that supercharges engine intake air by the action of a supercharger driven by engine rotational output.

Conventional automatic engine supercharger The supercharger is connected to the engine via a chain or other means, and is always in operation. As a result, the engine torque also increases and acceleration performance is excellent, but even when engine torque is not required as much as in normal driving, the engine intake is supercharged, so fuel is required in proportion to the supercharging. Therefore, there was a drawback that fuel efficiency was significantly inferior. Therefore, the present invention limits the supercharging range by the supercharger to the low and medium speed rotation range of the engine,
The purpose is to stop supercharging in the engine's idle/rpm range and high speed range to improve fuel efficiency.

In order to achieve the above object, in a supercharger for an automobile engine in which a supercharger provided with an engine absorption system G is driven by engine rotational output, the engine rotational output and the engine rotational output are A clutch is provided for driving (connecting, disengaging and switching) the supercharger and the supercharger, and a passage bypassing the supercharger and a control valve for controlling the opening and closing of the passage are provided. The gist of the configuration is to increase the supercharging pressure by controlling the clutch to be switched to the connecting side and controlling the control valve to close when the engine is in the rotation range.

With the above configuration, the supercharger does not operate in the idling speed range and high speed range of the engine, so fuel consumption can be reduced and fuel efficiency can be improved, achieving the initial objective.

In addition, according to the present invention, since the supercharger is not operated in a high speed rotation range, it is possible not only to improve the durability of the supercharger, but also to improve the durability of the supercharger.
Setting the upper limit of the rotation speed of the supercharger to the upper limit of the supercharging range (low and medium speed range of the engine) has the effect of making the supercharger smaller and lighter than conventional ones.

Additionally, the present invention has a simple configuration because supercharging is controlled only by the engine rotation speed, and especially when used in automatic vehicles, etc., there is no change in rotation speed due to gear shifting operations, so control based only on the engine rotation is extremely efficient. Supercharging control can be performed.

An embodiment of the present invention will be explained below based on the drawings. Figure 1 shows a system configuration in which a supercharger according to the present invention is assembled to an engine, and shows a system configuration in which a supercharger according to the present invention is assembled into an engine, and the system passes from an F-cleaner 10 to a carburetor (or fuel injector) 11. Capretor 11 and air cleaner 1O of the engine intake system leading to the engine 12
A supercharger 14 is provided in the intake passage 18 between the two. This supercharging 1114 is driven at 150 rotations of the engine output shaft to supercharge intake air to the engine. In this supercharging m14, the rotation of the engine output shaft 15 is caused by the rotation of the pulley 16°17
It is transmitted to the supercharging drive shaft 19 via the electromagnetic clutch 18 and is driven, and when the solenoid 20 of the electromagnetic clutch 18 is de-energized (the engine output shaft 1
5 does not reach the drive shaft 19, and the supercharging @14 stops the supercharging action. A normally open control pulp 21 is provided in the bypass intake passage 22 that bypasses the supercharger 14, and the solenoid of the control pulp 21 is closed when the supercharging @ 14 is activated, that is, when the solenoid 20 is energized. 28 is also switched to the excited state to control the control pulp 21 in the closing direction, and the engine intake supercharged in supercharging@14 leaks to the air cleaner 10 side via the control pulp 21, reducing supercharging performance. This prevents this from occurring and increases the boost pressure. Furthermore, when the supercharger 14 is not operating, the engine intake air is supplied to the air cleaner 1.
Controlled from 0) Glua 21'lE-Nakayapreta 11
．． It is sent to engine 12. A control circuit 80 controls the solenoid 2 based on a human power signal from an engine rotation sensor 81.
Send control signal to 0.23. Note that a feedback signal is input from the solenoid 28 to the control circuit 30.

Next, the control circuit 80 of the supercharger 14 will be explained based on the second factor. In this embodiment, the engine speed sensor 81 outputs the engine speed in pulses based on the ignition signal of the igniter. The F/V circuit 82 converts this pulse signal into a voltage signal proportional to the engine speed, and the pulp opening instruction signal generating circuit 38 obtains an output voltage EE as shown in the figure.

Here, FIG. 4 shows a circuit diagram of the valve opening instruction signal generation circuit 83. A voltage signal V1 (FIG. 5) proportional to engine speed 1 obtained from the F/V circuit 82 is applied to the non-inverting input terminals of operational amplifiers 40 and 41.
, is there. A first set voltage obtained by dividing the constant power supply voltage VOO by resistors R1r and R2 is input to the inverting input terminal of the operational amplifier 40. Further, a second set voltage obtained by dividing the constant power supply voltage Vcc by resistors R3+R4 is input to the inverting input terminal of the operational amplifier 41. op en 1
40.41, when the input to the non-inverting input terminal becomes higher than each of these set voltages, outputs V, , V3 (FIGS. 6 and 8) are obtained. Here, since the second set voltage is set to a higher voltage than the first set voltage, the operational amplifier 40 obtains the output V2''e first. The operational amplifier 41 corresponds to the engine's am speed range.Next,
The output V of the operational amplifier 40 is clamped by the diode D1, and after reaching the voltage obtained by dividing the constant power supply voltage Vco by the resistors R,, R, the output V4 (
Figure 7).

The output V4. from each of these operational amplifiers 40.41. V
3 is input to a differential amplifier composed of an operational amplifier 42 and resistors R, , R,. This operational amplifier 42 synthesizes and amplifies the outputs of the operational amplifiers 40 and 41 to form an output Vs (FIG. 9). This output vll
is the diode D24. -More clamped, constant power supply
This prevents the voltage from falling below the voltage obtained by dividing the voltage VC (3 by the resistor R91RIO).

As described above, the pulp opening instruction signal Ve (Fig. 10)
Get it. According to this output voltage v6, the pulp drive servo circuit 34 operates, the control valve solenoid 23 is actuated, and the control valve 18 is controlled. Here, when V,==Va, the control valve 18 is fully open, and V,
= Vb, the control valve 18 is fully closed.

Further, the output v7 of the comparison circuit 85 which compares the output voltage V with the reference voltages vc and vd is as shown in the upper diagram of FIG. or works. Here, the output V7 of the comparator circuit 85 has hysteresis, which is to prevent hunting of the supercharger near the boundary of the supercharging region.

Finally, Figure 11 shows the relationship between engine speed and torque when the supercharger of the present invention is installed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a system of an embodiment of the present invention,
FIG. 2 is a diagram showing a control circuit of an embodiment of the present invention,
8 is a diagram showing the output voltage of the pulp opening instruction signal generation circuit and the output voltage of the comparator circuit of the control circuit in FIG. 2, and FIG. 4 is a diagram showing the output voltage of the valve opening instruction signal generation circuit of the control circuit in FIG. 2. Circuit diagram, Figure 5, Figure 6, Figure 7, Figure 8, Figure 9, and Figure 1θ are each part of the circuit diagram in Figure 4)'ii EF vl 1 V21 Vx + ■4
11 is a T diagram showing the relationship between engine speed and torque. DESCRIPTION OF SYMBOLS 12... Engine, 14... Supercharger, 18... Clutch, 20... Solenoid, 21... Control valve, 28... Solenoid, 80... Control circuit patent applicant Aisin Seiki Reio Nakai, Representative of Kan Co., Ltd. Procedural Amendment (Voluntary) 1゜ Incident Indication 1982 Patent/Application No. 127995 2 Title of Invention Method for controlling a supercharger for an automobile engine 3 Amendments to be made Relation to the Patent Applicant Case Rei Nakai, Representative of the Patent Applicant 5, Contents of the Amendment (1) In the 8th line of page 6 of the specification, the phrase “has been input.” Negative feedback is applied by 1. ” he corrected. (2) On page 6, line 6 of the specification, [input
J is input, and negative feedback is applied by resistor R12. ” he corrected. (3) On the 9th line of the 7th notice of the specification, ``匍'' govalve 18''
(44) In the 10th line of page 7 of the specification, the statement "rl+ij control valve], 8" is corrected to "control valve 21J." (5) On page 7, line 11 of the specification, “Control valve 18J
``Correct the control valve 21J.'' (6) In the drawings, correct figures 8 and 4 as shown in the attached sheet.

Claims (1)

[Claims] In a supercharger for an automobile engine in which a supercharger installed in an engine intake system is driven by engine rotational output, a clutch is provided to drively connect and disconnect the engine rotational output and the supercharger. At the same time, a passage bypassing the supercharger and a control valve for controlling the opening and closing of the passage are provided, and the clutch notch is controlled to be switched to the connecting side when the engine is in a low to medium speed rotation range, and A control method for a supercharger for an automobile engine that increases supercharging pressure by controlling the control/<lub to close.