JPS60192844A - Throttle valve control device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve drivability by changing relation between an accelerator pedal and a throttle valve in accordance with a signal from a warming-up condition detecting device. CONSTITUTION:Treading amount of an accelerator pedal by a driver is detected by an accelerator opening detector. Warming-up condition of an engine is judged by a water temperature sensor. The opening of a throttle valve is controlled according to the treading amount of the accelerator pedal, but the relation between the treading amount of the accelerator pedal and the opening of the throttle valve is changed in accordance with the warming-up condition of the engine. Thus, as unreasonable load is not applied to the engine until the engine is warmed up, durability of the engine is improved and drivability is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device for controlling the operation of a throttle valve of an internal combustion engine for an automobile.

[Prior art]

BACKGROUND ART In recent years, there has been concern about the deterioration of the driving feeling due to the reduction in the output of internal combustion engines due to exhaust gas purification measures and the increase in the size and weight of general passenger cars. here,
Conventionally, the speed of a car is adjusted by opening and closing the throttle valve when the driver presses the accelerator pedal, changing the amount of air-fuel mixture sucked into the engine, thereby changing the shaft output and rotational speed of the engine. Therefore, it is necessary to accurately reflect the movement of the accelerator pedal, which is the driver's intention, in the rotation of the throttle valve. The characteristics need to be changed in various ways depending on the output and usage conditions of the engine, not just one type of linear relationship. In addition, the movement of the accelerator pedal is mainly adjusted by the expansion and contraction of the driver's footsteps, and the range of movement is very small, about 10 feet at the tip of the foot. This link mechanism goes from the foot of the driver's seat into the bonnet to the internal combustion engine's carburetor, which is a place with many restrictions, so the transmission of motion is difficult. becomes very complex, e.g.
In the link mechanism, an example of which is shown in the figure, the accelerator pedal 1
00 to the throttle valve of the carburetor 400,
Many transformations such as rotational motion, reciprocating motion, rotational motion, reciprocating motion, and rotary motion are required, and for this reason, the movement of the ankle that reflects the driver's intention, that is, the movement of the accelerator pedal 100, is accurately transmitted to the throttle valve. I can't do it. In other words, since many conversions are required, a linear proportional relationship does not hold between the rotation of the accelerator pedal 100 and the rotation of the throttle valve, and hysteresis may also occur due to play at the joints of each conversion. be. Furthermore, the wire mechanism has the disadvantage that a considerable amount of force is required to eliminate slack in the wire and to transmit the motion of the accelerator pedal 100 due to the influence of friction, making the accelerator feel heavy. Furthermore, it is not easy to adjust the operating range of the accelerator pedal 100 to an amount suitable for the driver using either the link mechanism or the wire mechanism. The characteristics between degrees are limited to one type, and it is extremely difficult to change them depending on the state of the engine.

Therefore, a device has been devised that eliminates the problems of the link mechanism and wire mechanism by electrically detecting the accelerator opening degree and driving the throttle valve with a servo motor in accordance with this detection signal. There is.

[Purpose of the invention]

The present invention further improves the device for electrically interlocking the accelerator pedal and the throttle valve. That is, the present invention provides a state detector for detecting the engine state, and adjusts the accelerator pedal according to the state detection signal. By configuring the structure to change the relationship between the opening degree and the throttle valve opening degree, it is possible not only to quickly and faithfully transmit the driver's intention of accelerator pedal movement to the throttle valve, but also to change the relationship between the opening degree and the throttle valve opening degree. The purpose of this invention is to provide a throttle valve control device for an internal combustion engine that can automatically change the relationship between accelerator opening and throttle opening under specific engine conditions such as be.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

First, FIG. 2 shows the overall configuration of the present invention, with 110
is an accelerator opening degree detector connected to the accelerator pedal 100, which detects the opening degree of the accelerator as a voltage signal according to the amount of depression of the accelerator pedal 100 opened by the driver's foot. 200 is a control circuit that controls the rotational direction of the reversible motor 300 based on signals from the accelerator opening detector 110 and the throttle/nottle valve opening detector 420 that detects the opening of the throttle valve 410 of the carburetor 400; As shown in FIG. 3, its specific configuration is as follows:
A current amplification circuit 220 consisting of a transistor 221 and a resistor 222, a comparison circuit 230 consisting of a comparator 231,
and a resistor 241, a transistor 242, a diode 243 for absorbing back electromotive force, and a movable contact 245a +, 2
45b+, fixed contact 245a2.245a3.245b
The relay circuit 240 includes a relay coil 244 that drives the 2.245b3. 260 again
is a non-inverting amplifier circuit consisting of resistors 262, 263, 264 and an amplifier 261. 500 is a switch, 510
is the power supply. 300 is a reversible motor 31 that is connected to a throttle valve 410 via a friction clutch 310 and whose rotation direction is changed by a signal from the control circuit 200;
0 is a known friction clutch, and the rotation range of the throttle valve 410 is limited, and even if the throttle valve 410 stops at one end of the predetermined rotation range due to a bar (not shown), etc., the built-in slip mechanism This prevents excessive torque from being applied to the drive shaft of the reversible motor 300. 420
is a throttle valve opening degree detector that is connected to the throttle valve 410 and detects its opening degree.

Further, 600 is a water temperature sensor as a state detector for detecting the engine state, and it functions as a switch that opens when the temperature of the engine cooling water is low and closes when the water temperature is normally used (about 80° C.).

Next, the operation of this apparatus having the above configuration will be explained.

When the driver depresses the accelerator pedal 100 for acceleration, the output voltage of the accelerator opening detector 110 and the current amplification circuit 210, which are input to one input terminal of the comparator 231, increases.
On the other hand, the throttle valve opening degree detector 420 and the current amplification circuit 2
20 and the non-inverting amplifier circuit 260 are input to the other input terminal of the comparator 231 in a low output voltage state as before.

Therefore, the output of the comparator 231 becomes "0" level, the transistor 242 of the relay circuit 240 is in the OFF state, no current flows through the relay coil 244, and the contact 245a
I-245a3 and contacts 245b+245b3 are connected, the reversible motor 300 rotates forward, and the throttle valve 41
0 opens to a position corresponding to the opening degree of the accelerator pedal 100, the amount of air-fuel mixture sucked into the engine changes, and the vehicle is accelerated. Conversely, the driver presses the accelerator pedal 10 to decelerate.
If the depression of 0 is reduced, the accelerator opening detector 11
0 and the output voltage of the current amplification circuit 210 become low, while the throttle valve opening degree detector 420 and the current amplification circuit 220 output voltage becomes low.
Since the output voltage of the comparator 231 remains high, the output of the comparator 231 becomes 11'' level, the transistor 242 of the relay circuit 240 is turned on, and current flows through the relay coil 244 and the contacts 245a + - 245a2 and the contact 24.
5b+245b2 is connected, the reversible motor 300 rotates in reverse, and the throttle valve 410 is closed. For this reason, when the relationship between the opening degree of the accelerator pedal 100 and the opening degree of the throttle valve 410 deviates from the predetermined relationship due to the driver moving the accelerator pedal 100 at will, the reversible motor immediately adjusts the relationship to the predetermined relationship. 300 rotates and the throttle valve 41
0 is operated to open and close.

When carrying out the above operation, the water temperature sensor +600 is open for a while when the temperature of the engine coolant is low or after starting, so the resistor 262 acts as a negative feedback resistor for the amplifier 261 and a large amplification factor is obtained. The throttle valve opening signal from the throttle valve opening detector 420 is thick (amplified and compared with the accelerator opening signal in the comparison circuit 230, so the signal from the accelerator opening detector 110 and the throttle valve opening detection are The signal from the water temperature sensor 600 is balanced by the characteristic relationship shown in FIG.
is closed, so the negative feedback resistance of the amplifier 261 is a small resistance composed of the parallel resistances 263 and 264.
Since the amplification factor becomes smaller, the accelerator opening detector・110
The signal from the throttle valve opening detector 420 is balanced by the characteristic relationship shown in FIG. 4(B). As a result,
When the engine cooling water temperature is low, the opening of the throttle valve 410 is kept small relative to the opening of the accelerator, so no excessive load is applied to the engine until the engine warms up, which improves engine durability. It is possible to reduce high and harmful exhaust gases (-carbon oxides and hydrocarbons).

Furthermore, in the above embodiment, the negative feedback resistance of the amplifier 261 is
Although switching is performed using the water temperature sensor 600 that detects changes in the engine cooling water temperature, it is also possible and effective to change the control of the throttle/2-torque valve 410 using a vehicle speed switch or the like depending on the usage state of the engine. Further, in this embodiment, the amplification factor of the opening signal of the throttle valve 410 is changed, but the same can be done by amplifying the accelerator opening signal and changing the amplification factor.

Next, an embodiment of the safety device according to the present invention shown in FIG. 5 will be described. In Fig. 5, 311 is a safety device;
Reference numeral 12 denotes an electromagnetic clutch, which is composed of a solenoid 314, a fixed part 316 which is a magnetic material, a compression spring 315, a case 318, and a movable part 317 which is a magnetic material.When the solenoid 314 is energized, the fixed part 316 and the movable part 317 are connected. They come into close contact with each other and separate when they are cut off. Reference numeral 313 is a torsion coil spring whose both ends are attached to a movable part 317 and a stay 319, respectively, and when the electromagnetic clutch 312 is energized, the rotational movement of the reversible motor 300 is connected to the friction clutch 310 and the fixed stay. section 316 , movable section 317 , and throttle valve shaft 411 connected to movable section 317
The throttle valve 410 is controlled by the reversible motor 300, but when the electric current of the electromagnetic clutch 312 is cut off, the fixed part 316,
The movable part 317 is separated, and the torsion coil spring 313 causes the throttle valve 410 to be fully closed.

The operation of the above configuration will be described below. Control circuit 20
When the zero or reversible motor 300 is in a normal operating state, the electromagnetic clutch 312 is energized and the aforementioned throttle valve control is performed. , electric value clutch 3
12 and the throttle valve 410 can be closed, making it possible to safely stop the vehicle.

Furthermore, it is of course possible to provide a key pin or the like instead of the electromagnetic clutch 312 and use a solenoid or the like to pull out the key pin to release the connection between the throttle valve 410 and the reversible motor 300.

In the above embodiment, the friction clutch 310 is used to prevent excessive torque from being applied to the motor drive shaft, but the reversible motor 300 may be stopped using a switch or the like immediately at the throttle valve stop position. .

In addition, although the above embodiment was explained using a spark ignition engine using the carburetor 400, a compression ignition engine can also be used in which the negative pressure for fuel adjustment is adjusted by moving the throttle valve with the accelerator pedal. The rotational speed of the engine is adjusted, and the same function can be obtained even when the device of the present invention is used in a compression ignition engine.

Furthermore, as automatic driving devices and the like become necessary due to the diversification of conventional transportation, the device of the present invention not only receives the opening signals of the accelerator pedal 100 and throttle valve 410 as described above, but also the vehicle speed signal, intake air mixture amount, etc. The opening and closing of the throttle valve 410 is controlled by speed adjustment signals such as the above, and the speed of the vehicle can be adjusted appropriately to further improve safety and drivability.

Further, a pulse motor may be used as the reversible motor 300, and a differential transformer may be used as the accelerator opening detector 110 and the throttle valve opening detector 420.

〔Effect of the invention〕

As described above, in the device of the present invention, the accelerator pedal and the throttle valve are electrically linked, and the accelerator opening and throttle valve opening are adjusted according to the signal from the warm-up state detector that detects the warm-up state of the engine. Since the relationship between the speed and speed is changed, the movement of the accelerator pedal, which is the driver's intention, can be quickly and faithfully transmitted to the throttle valve, and the movement of the accelerator pedal can be electrically transmitted to the throttle valve. This makes it possible to easily adjust the operating range of the accelerator pedal to suit the driver, and also automatically changes the relationship between the accelerator opening and throttle opening under predetermined engine conditions. This has the excellent effect of allowing you to set up relationships that otherwise would not exist.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of a conventional link mechanism, Fig. 2 is a system diagram showing the overall configuration of the present invention, Fig. 3 is an electric circuit diagram showing an embodiment of the device of the present invention, and Fig. 4 is a characteristic diagram showing the re-output relationship of the accelerator opening detector and the throttle valve opening detector in the device of the present invention, and Fig. 5 shows an example of the main part of the throttle valve drive when a safety device is used in the device of the present invention. FIG. 100... Accelerator pedal, 110... Accelerator opening detector, 200... Control circuit, 300... Reversible motor forming a drive device, 316... Friction clutch, 3
11...safety device, 400...carburizer, 410...
- Throttle valve, 420... Throttle valve opening detector, 600... Water temperature sensor forming a warm-up state detector. Representative Patent Attorney Takashi Okabe Patent Application No. 9115 of 1982 2 In the name of the invention JPAtiuO:) Suroso 1-) L/=Ji' lyrics! a
ll device 3? 1iRelationship with Persons Who Will Correct ()1 Patent Applicant 14 (469) Iwatani, Shimohazaku-cho, Nishio-shi, Aichi Prefecture Japan Auto Parts Research Institute Representative Representative: 3rd generation Shogo (1 idiot) 4th generation: Mr. 448 1-1 Showa-cho, Aichi Kasudani City-NN-'
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Claims (1)

[Claims] an accelerator opening degree detector that outputs an accelerator opening degree signal according to the amount of depression of the accelerator pedal; a throttle valve opening degree detector that outputs a throttle valve opening degree signal according to the opening degree of the throttle valve; A driving device that is connected to open and close the throttle valve, a warm-up state detector that detects the warm-up state of the engine and outputs a signal representing the state, and the accelerator opening signal and the throttle valve opening signal. a control circuit that controls the direction and amount of rotation of the throttle valve by a drive device and changes the relationship between the throttle valve opening and the accelerator opening in accordance with the warm-up state detection signal; A throttle valve control device for an internal combustion engine, characterized in that the opening degree of the throttle valve is made smaller than when the throttle valve is cold.