JPS5910752A - Engine throttle valve controller - Google Patents

Abstract

PURPOSE:To prevent breathing of engine under acceleration by slowing the throttle valve opening speed when the variation speed of the stepping of accelerator is higher than predetermined level while the engine temperature is lower than predetermined level. CONSTITUTION:Under travelling of car, the stepping of an accelerator pedal 1 is detected by an accelerator opening detector 2 to feed a signal through an amplifier 3 to a differential amplifier 4 then a difference against a signal from a throttle valve opening detector 10 is produced to drive a motor 8 thus to control a throttle valve 9. The output from said accelerator opening detector 2 is provided to a differentiator 11 then compared with the referential level in a comparator 12 while the cooling water temperature of engine is detected by a water temperature sensor then compared with the referential level in a comparator 14 and when the accelerator stepping speed and the water temperature exceed over predetermined levels, a signal is fed from AND gate 15 to the amplifier 3 thus to decrease the amplification factor. Since the throttle valve will open slowly at the initial stage of acceleration, the air/fuel ratio of the mixed gas will be lean resulting in prevension of breathing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a throttle valve control device for an engine.

In general, an engine throttle valve control device controls the opening and closing of the throttle valve according to the movement of the accelerator pedal when the driver depresses the accelerator pedal. It is necessary to accurately correspond to the movement of the accelerator pedal and the opening and closing of the throttle valve. By the way, if the accelerator pedal and the throttle valve are connected by a link mechanism or a wire mechanism, the movement of the accelerator pedal is transmitted to the throttle valve through reciprocating motion or rotational motion, which makes the structure extremely complicated. Because the links and other connecting parts tend to rattle, there is a problem that the throttle valve's follow-up performance is not very good, and furthermore, due to large friction, a large amount of force is required to operate the accelerator pedal. There is a problem with this.

Therefore, as a throttle valve control device that eliminates such problems, conventionally, the so-called electric control method extracts the movement of the accelerator pedal as an electric signal, and uses this electric signal to operate a tea actuator to open and close the throttle valve. There is a
(see publication).

By the way, in general, when the driver suddenly depresses the accelerator pedal, the throttle valve opens rapidly and the intake air wave increases accordingly, but due to the inertia of the fuel, there is a delay in the supply of fuel, and the mixture There was a problem in that the air-fuel ratio of the fuel became lean, and stable combustion was not performed, resulting in the vehicle not accelerating smoothly, which was likely to cause so-called sluggishness.

This phenomenon was particularly noticeable when the engine was cold, where the fuel was poorly vaporized and atomized and its inherent combustibility was unstable.

This invention has been made to solve the above-mentioned conventional problems, and since the above-mentioned electrically controlled throttle valve control device controls the opening and closing of the throttle valve using electric signals, the throttle valve Focusing on the fact that it is possible to set the opening/closing control characteristics of the throttle valve in response to the depression of the accelerator pedal to the desired characteristics by appropriately processing the applied electrical signals, sudden accelerator operation is performed when the engine is cold. An object of the present invention is to provide a throttle valve control device for an engine that prevents the engine from breathing even when the accelerator pedal is suddenly depressed when the engine is cold by slowing down the opening speed of the throttle valve. It is said that

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

FIG. 1 shows an engine throttle valve control device according to an embodiment of the present invention. In the figure, 1 is an accelerator pedal,
2 is an accelerator opening degree detector which generates an accelerator opening degree signal a corresponding to the depression m (depression position It) of the accelerator pedal 1; 3 is an accelerator opening degree detector which normally amplifies the accelerator opening degree signal a by an amplification degree of 1; When receiving control signal C, accelerator opening signal λ
4 is a differential amplifier that calculates the difference between the output of amplifier 3 and the throttle opening feedback signal d; A pulse width setting device sets the pulse width of the pulse signal. 6 is a polarity discrimination circuit that discriminates whether the polarity of the output of the differential amplifier 4 is positive or negative and outputs a discrimination signal f when it is negative. 7 is usually a pulse width. 8 is a polarity inverting circuit which outputs the output of the setting device 5 with the same polarity, and when receiving the discrimination signal f of the polarity discrimination circuit 6, inverts the polarity of the output of the pulse width setting device 5 and outputs it; A DC motor (actuator) rotates forward or backward to open and close the throttle valve 9 according to the output of the reversing circuit 7, and lO is a throttle valve opener that detects the opening degree of the throttle valve 9 and outputs a throttle TpA degree signal d. It is a degree detector.

Further, 11 is a differentiation circuit that differentiates the output a of the accelerator opening degree detector 2, 12 is a comparator that compares the output of the differentiation circuit 11 with the reference voltage E1, and 13 is a water temperature sensor that detects the engine cooling water temperature. (temperature detector), 14 is water temperature sensor 13
A comparator 15 compares the output of the base=gravitational pressure E2 with the above-mentioned comparators +2. This is an AND circuit that generates the amplification control signal C by using two people to output +4. A control circuit 16 is constituted by the part surrounded by a dotted thin line in the figure, and the control circuit 16 receives the output of the water temperature sensor 13 and the accelerator opening signal λ, and controls the engine cooling water temperature and the accelerator pedal 1. Compare the change speed of the treadle cover with each set value,
Normally, a first drive signal is generated to open the throttle valve 9 at a speed corresponding to the rate of change of the depression cover of the accelerator pedal 1, and when the engine coolant temperature is below a set value and the rate of change of the depression cover is equal to or higher than the set value. In the above case, a second drive signal is generated to slowly open the throttle valve 9.

Next, the operation will be explained.

While the car is running, the accelerator opening detector 2 detects the depression of the accelerator pedal 1 (depression position) and generates an accelerator opening signal a, and the throttle valve opening detector 10 detects the opening of the throttle valve 9. The feedback signal d of the throttle opening is generated by detecting the throttle opening. When the driver depresses the accelerator pedal 1 in order to accelerate the automobile, the amplifier 3 in the control circuit 16 amplifies the accelerator opening signal a corresponding to the depressing lid by an amplification degree of 1. The dynamic amplifier 4 calculates the difference (b-'') between the output of the amplifier 3 and the throttle opening feedback signal d, and the pulse width setter 5 adjusts the pulse width according to the magnitude 1b-di of the calculated value. At the same time, the polarity discrimination circuit 6 is connected to the differential amplifier 4.
It is determined whether the polarity of the output is positive or negative, that is, whether it is accelerating or decelerating.
does not occur.

Therefore, the output of the pulse width setter 5 passes through the polarity reversing circuit 7 as the first drive signal with its polarity unchanged and is applied to the C motor 8. It rotates forward and opens the throttle valve 9 at a speed that corresponds to the amount of depression of the accelerator pedal 1. In this way, the throttle valve 9 opens to an opening degree that corresponds to the amount of depression of the accelerator pedal 1. As a result, the intake air of the engine increases, and the engine speed also increases, so that the automobile is smoothly accelerated to the desired speed.

Further, when the driver weakens the pressure on the accelerator pedal 1 to decelerate the vehicle and returns the pedal 1, the control circuit 1
Since the output (b-d) of the differential amplifier 4 becomes negative at 6, the polarity discrimination circuit 6 applies the discrimination signal f to the polarity inversion circuit 7, and the polarity inversion circuit 7 applies the discrimination signal f to the output of the pulse width setting device 5. The mass is inverted and output as a first driving signal. Then, in this case, the I) C motor 8 rotates in the reverse direction in response to the first drive signal 1, and the throttle valve 9 gradually closes to an opening corresponding to the amount of depression of the accelerator pedal 1 at that time. The vehicle is smoothly decelerated to the desired speed.

In this way, since the water system normally opens and closes the throttle valve 9 at a speed corresponding to the rate of change in the amount of depression of the accelerator pedal 1, the engine speed increases in accordance with the rate of change in the amount of depression of the accelerator pedal 1. Or, it will decrease, and as a result, it will be connected or excluded depending on the rate of change of the above-mentioned amount of depression of the automobile.

By the way, when the accelerator pedal l is suddenly depressed when the engine is cold, if the throttle valve 9 is opened at a speed that corresponds to the rate of change in the amount of depression of the accelerator pedal ■, as described above, the engine will breathe. There is a problem of inconsistency, but in Honsouk, this problem is resolved as follows. That is, the water temperature sensor 13 detects the engine cooling water temperature, and in the control circuit] 6, the comparator 1
4 compares the output of the water temperature sensor 13 with the set value E2. When the engine is cold, the cooling water temperature is lower than the set value E2, and the output of the comparator 14 becomes 11'm. Further, the differentiating circuit 11 differentiates the accelerator opening signal a (7) to detect the rate of change in the amount of depression of the accelerator pedal 1, and the output of the differentiating circuit 11 is compared with the set value E1 by the comparator 12. Since the speed of change of the stepping door is greater than the set value E1, the output of the comparator 12 is also "1". Both comparators 12.14
The output of is applied to the ANr) circuit 15, which generates an amplification control signal C, and the amplifier 3 amplifies the accelerator opening signal a by an amplification factor of 2. Then in this case,
The control circuit 16 applies a second drive signal smaller than the first drive signal -V to the DC motor 8, and the throttle valve 9 opens at a slow speed. When the accelerator pedal 1 approaches the desired depression crease, the rate of change in the amount of depression decreases, the AND circuit 15 stops generating both signals C on the amplification side, and the amplification degree of the amplifier 3 increases! It then returns to 1 and its output becomes larger.

At this time, the opening 1ic of the throttle valve 9 is also equal to the depression Jd of the accelerator pedal 1 (throttle valve P%, since it is less than the corresponding opening).
;It will be opened in full force. In this way, the throttle valve 9 slowly opens from 1 to 1 and then suddenly opens at the last point, and the intake nitrogen of the engine also slowly increases until the last one suddenly increases to 7jD. As a result, the fuel supply increases gradually as the intake air pressure increases, and the air/fuel ratio of the air-fuel mixture does not become leaner. There is almost no engine breathing.Furthermore, since the throttle valve 9 is opened wide at the end, the engine's acceleration performance does not deteriorate much.

FIG. 2 also shows a second embodiment of the invention. In the figure, the same reference numerals as in FIG.
8 normally sets the pulse width W of the pulse signal to the pulse width W1 (see the solid line in FIG. 3) according to the output of the differential amplifier 4, and the pulse width is set to W1 (see the solid line in FIG. This is a pulse width setting device that sets the signal to a pulse width W2 smaller than the normal case (see the one-dot chain line in FIG. 3).

In this way, when the engine is cold and the rate of change in the depression type of the accelerator pedal 1 is fast, the control circuit 16 reduces the rate of change in opening the throttle valve 9 by lowering the control gain (responsiveness) of the feedback control. Similarly to the above-mentioned embodiments, this embodiment can also prevent the engine from running out of breath due to sudden accelerator operation when the engine is cold.

Further, FIG. 4 shows a third embodiment of the wooden invention. In the figure, the same reference numerals as in FIG. A proportional solenoid (actuator) that opens and closes the throttle valve 9 in response to a drive signal, 21 is a circuit 3.11, 12, 14, 15.1
This is a control circuit composed of 9.

In this way, the opening/closing control of the throttle valve 9 is controlled by the first and second valves.
It is not necessary to use feedback control as in the embodiment of
Further, the proportional solenoid 20 may be used as the actuator for opening and closing the throttle valve 9, and the same effects as in the above two embodiments can be obtained in this embodiment as well.

Note that in the three embodiments described above, the control circuit is configured by a hard circuit, but the control circuit may of course be configured by software using a microcomputer.

Also, when the engine is cold and the accelerator is suddenly operated, the amplification level of the amplifier is 1. :2 may be changed according to the accelerator opening signal within a range smaller than the amplification degree 1 during normal operation. Further, the engine temperature may be detected not from the engine cooling water but from the engine exhaust system.

As described above, according to the present invention, in an electrically controlled engine throttle valve control device, the opening/closing control characteristics of the throttle valve in response to the depression of the accelerator pedal can be adjusted as desired by appropriately processing the electric signal applied to the actuator of the throttle valve. We focused on the fact that it is possible to set the characteristics of acceleration, and when the engine is cold and the accelerator pedal is suddenly depressed, the opening speed of the throttle valve is slowed down, which improves acceleration. This has the effect of preventing the engine from breathing without causing much deterioration.

[Brief explanation of the drawing]

1 is a circuit configuration diagram of a throttle left side aI device for an engine according to an embodiment of the present invention; FIG. 2 is a circuit diagram of a throttle valve control device for an engine according to a second embodiment 1 of the invention; The figure shows the output characteristics of the pulse width setter 18 of the above device, and FIG. 4 is a circuit configuration diagram of a third embodiment of the present invention. 1...Accelerator pedal, 2...Accelerator 15) J
Degree detector, 8...1. ) C motor C actuator]
, 9... Throttle valve, 13... Water temperature sensor, 16
, 16'... Control circuit, 20... Proportional solenoid (actuator), 21... Control circuit. Patent Applicant: Toyo Kogyo Co., Ltd. Agent, Patent Attorney: Ken Hayase - Chijigoku 11:, Written (spontaneous) Director of Special Laws 18 Naka 1'1 Indication 111 Application No. 120392 No. 1987-12 Invention Name Engine Throttle Valve Opening + A 3 Relationship with Lff'l in the olden days of arresting the city Special II'l Applicant 11
Place: 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima
13) Toyo 1 Nigyo Co., Ltd. Chiyo U1 2nd Building 7th Floor 5, Part 6 of the Claims of the Specification Subject to Amendment, Contents of the Amendment (1) Feature M/R Claims of the Specification Separately , I will correct it as follows. Above 2, Claims (1) Accelerator opening 1u according to the depression of the accelerator pedal
Accelerator opening detector that outputs Hakugo and 1 engine item I
O 46′! 1j of the temperature detector to be output and the mixed detector
XII F1 and the above mentioned accelerator opening) (In response to the Iba issue, the first drive signal which opens at a speed corresponding to the change speed of "1st torque valve" - written down 11 is generated, and the above engine Togawa is set. ＞
i! When the speed of change of the above-mentioned pedal stroke is greater than the set value, the second drive mode (1) that gently listens to the throttle valve is activated.
6. A throttle valve control device for an engine, comprising: a control circuit that generates a No. 11 signal; and an actuator that opens and closes the throttle valve by applying the first or second drive signal.

Claims (1)

[Claims] (1) An accelerator opening detector that outputs an accelerator opening signal according to whether the accelerator pedal is depressed, a temperature detector that detects engine temperature, and a sensor that receives the detection signal of the temperature detector and the accelerator opening signal. The set values of the engine temperature and the rate of change of the accelerator pedal cover are compared, and a first drive signal is generated to open the throttle valve at a speed corresponding to the rate of change of the accelerator pedal. a control circuit that generates a second drive signal that gently opens the throttle valve when is less than a set value and the rate of change of the depression iris is greater than or equal to the set value; A throttle valve control device for an engine, comprising an actuator for opening and closing the throttle valve.