JPS6112098B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a throttle valve control device that controls a throttle valve that controls the amount of air-fuel mixture supplied to an engine using an electrical signal. Conventionally, in spark-ignition engines used in automobiles, an accelerator pedal equipped with a return spring is provided on the floor in front of the right side of the driver's seat in the vehicle interior, and the accelerator pedal is attached to one end of a link or wire that has a fulcrum in the partition wall of the vehicle interior. A configuration in which the pedals are connected by sliding means or mechanical coupling means, and when the accelerator pedal is depressed, the throttle valve connected to the other end of the link or wire is operated to increase the opening degree. This throttle valve adjusts the amount of air-fuel mixture sucked into the working chamber of the engine to control the engine output. However, in the output control device with the above configuration, when no artificial external force is applied to the throttle valve, the throttle valve is closed by the reaction force of the return spring so that the engine reaches the minimum output, but the spring reaction force due to aging The throttle valve may fail to close due to a decrease in the engine speed, looseness in various link parts, and increased friction. If the throttle valve does not close properly, problems such as poor idling, increased fuel consumption, and dieseling occur. Furthermore, in order to support vehicle speed maintenance, automatic start/warm-up operation, unmanned operation, etc., another operating device must be added to the vehicle. Additionally, a potentiometer is placed on both the accelerator pedal and the throttle valve, and an electric motor is connected to the throttle valve, so that the electric motor is controlled in a closed loop so that the amount of operation of the accelerator pedal matches the opening degree of the throttle valve. Although devices have been proposed,
In this device, the degree of opening of the throttle valve must be detected by a potentiometer, which poses a problem in that the device becomes complicated and expensive. The present invention has been made in view of the above points, and provides a throttle valve control device that can prevent the throttle valve from closing incorrectly and perform open loop control that does not require a potentiometer to detect the opening degree of the throttle valve. The purpose is to The present invention will be explained below with reference to embodiments shown in the drawings.
In FIG. 1, reference numeral 1 denotes an accelerator pedal (operating member), which is rotatably attached to a stay 2 fixed to the floor on the driver's seat side of an automobile by a through bolt 3. Next, the operation amount sensor 10 that detects the operation amount of the accelerator pedal 1 will be explained. Reference numeral 11 denotes an optical shutter that utilizes a part of the accelerator pedal 1, and as shown in FIG. 2, a plurality of slits 12 of a constant width are formed at equal intervals around the fan-shaped circumference. A cover 13 is provided integrally with the stay 2 to cover the optical shutter 11.
3 has slits 14 to 17 formed at positions facing each other with the optical shutter 11 in between. In addition, in FIG. 2, the slits 15 and 17 are shown virtually. Here, each slit is formed such that slits 14 and 15 face each other, and slits 16 and 17 face each other, and the distance between slits 14 and 16 and the distance between slits 15 and 17 are
It is set so that it is not an integral multiple of the interval between the two. Light-emitting diodes 20 and 22 are installed outside the slits 14 and 16, respectively, and phototransistors 21 and 23 are installed outside the other slits 15 and 17, and the optical axis between the light-emitting diodes and the phototransistor is The slit 12 of the optical shutter 11 is configured to cross the slit 12 of the optical shutter 11. An amplifier circuit A for amplifying the output signals of the phototransistors 21 and 23 is built into the case 24 that houses the phototransistors 21 and 23. Next, the amplifier circuit A and control unit U will be explained with reference to FIG. Amplifying circuit A includes resistor 3
1 to 36 and transistors 37 and 38, including a phototransistor 21 or 22.
When the light is received, the transistor 37 or 38 turns on and outputs a 0 level signal from the terminal a or b. In addition, the phototransistor 21 or 2
2 turns off when the light is cut off, transistor 37 or 38 turns off, and a 1 level signal is output from terminal a or b. The control unit U is roughly composed of a waveform shaping circuit B, a direction determining circuit C, and an output circuit E. Of these, the waveform shaping circuit B has a resistor 41
~43 and a transistor 44, when the output of terminal a is 1 level, a 0 level signal is output from terminal d, and when the output of terminal a is 0 level, a 1 level signal is output from terminal d. do. The direction determination circuit C includes resistors 45 and 46 and a data type flip-flop (for example, manufactured by RCA).
The data terminal D of the flip-flop 47 is connected to the terminal a of the amplifier circuit A, and the clock terminal CL is connected to the terminal b of the amplifier circuit A. The data type flip-flop 47 operates based on the following truth table.

[Table] Note that 1 indicates the rise of the pulse signal. The output circuit E includes a shift register 48 and a resistor 49.
-52, power transistors 53-56, and diodes 57-60, the clockwise terminal CW of the shift register 48 is connected to the output terminal Q of the flip-flop 47, and the counter clockwise terminal CCW is connected to the output terminal. Further, the respective collectors of the power transistors 53 to 56 are connected to excitation coils 61 to 64 of the pulse motor M, and the diodes 57 to 60 are connected to a power supply line and a common terminal of the excitation coils 61 to 64. The amplifier circuit A and the control unit U are connected to a battery 66 via a key switch 65, and are supplied with power from the battery 66. The pulse motor M is of a four-phase type, and is connected via a joint 70 to a shaft 69 of a throttle valve 68 provided in an engine intake system, for example, a carburetor body 67, as shown in FIG. In the above configuration, when the driver of the car depresses the accelerator pedal 1, the optical shutter 11 is activated by the light emitting diodes 20, 2 in conjunction with the pedal 1.
2 - Rotates across between phototransistors 21 and 23. For this reason, the phototransistor 21,
23 intermittently receives light from the light emitting diodes 20 and 22. At this time, the slits 14-16 (or 15-17) of the cover 13 and the slit row 12 of the optical shutter 11 have different pitches, and the slits 14-16 (or 15-17) of the cover 13 have different pitches.
Since the spacing between the slits 16 is not an integral multiple of the spacing between the slits 12, the phototransistor 2
1 and 22 repeatedly turn on and off in different phases. Therefore, the terminal a of the amplifier circuit A outputs a pulse signal as shown in FIG. 5a, and the other terminal b outputs a pulse signal as shown in FIG. 5b, which has a phase different from that shown in FIG. The pulse signal shown is output. The pulse signals shown in FIGS. 5a and 5b are input to the data terminal D and clock terminal CL of the flip-flop 47. The flip-flop 47 is
Since the input signal to the clock terminal CL rises when the input signal to the data terminal D is at 1 level, the rotation direction of the pulse motor M is determined to be the positive direction, and the output terminal Q is at the 1 level and the output terminal is at the 0 level. Output a signal. Further, the waveform shaping circuit C inverts the output of the amplifier circuit A and outputs this inverted signal from the terminal d. As a result, a 1-level signal is input to the clockwise terminal CW of the shift register 48, so the output circuit E drives the pulse motor M in the forward direction. Further, the output circuit E changes the current applied to each excitation coil 61 to 64 of the pulse motor M for each pulse applied to the timing terminal T, and the pulse motor M rotates by an angle corresponding to the number of pulse signals applied to the timing terminal T. move. In other words, the number of pulse signals is proportional to the amount of depression (operation amount) of the accelerator pedal 1, and the opening degree of the throttle valve 68 increases in accordance with this amount of operation. Conversely, if the driver releases accelerator pedal 1,
The optical shutter 11 rotates in the opposite direction to when the accelerator is depressed. Therefore, the terminal a of the amplifier circuit A outputs a pulse signal as shown in FIG. 6a, and the other terminal b outputs a pulse signal shown in FIG. 6b having a different phase. Therefore, when the input signal to the data terminal D is at the 0 level, the flip-flop 47 clocks the clock terminal.
Since CL rises, the rotation direction of the pulse motor M is determined to be the opposite direction, and a 0 level signal is output from the output terminal Q, and a 1 level signal is output from the output terminal. Furthermore, the waveform shaping circuit C inverts the output of the amplifier circuit A in the same manner as when the accelerator is depressed, and outputs this inverted signal from the terminal d. As a result, a 1-level signal is input to the counter clockwise terminal CCW of the shift register 48, so the output circuit E drives the pulse motor M in the reverse direction. Further, the output circuit E changes the current applied to each excitation coil 61 to 64 of the pulse motor M for each pulse applied to the timing terminal T, and the pulse motor M rotates by an angle corresponding to the number of pulse signals applied to the timing terminal T. move. Therefore, the opening degree of the throttle valve 68 decreases by an angle proportional to the amount of return of the accelerator pedal 1. In this way, the opening degree of the throttle valve 68 has a one-to-one relationship with the operation amount of the accelerator pedal 1, and the throttle valve 68 is operated according to the driver's intention. In addition, the fully closed position of the throttle valve 68 is accurately controlled by the pulse motor M, and there is no possibility of a closing failure, resulting in engine idle failure,
Increase in fuel consumption and occurrence of dieseling are prevented. In the above embodiment, the drive of the pulse motor M is controlled only by the accelerator pedal 1, but a switch is provided in the middle of the electric conductor connecting the amplifier circuit A and the control unit U, and this switch It is also possible to add an operation amount sensor that generates a pulse signal in response to the manual operation lever via the manual operation lever, so that the pulse motor M can also be controlled by the manual operation lever. In addition, a switch is installed in the middle of the electric wire connecting the pulse motor M and the control unit U.
An external signal generator is configured in parallel with the external signal generator, and the external signal generator is configured to selectively supply pre-programmed patterns such as vehicle speed setting, starting warm-up at high and low temperatures, or deceleration. The engine output may also be controlled using something other than the accelerator pedal. Furthermore, by installing a safety circuit that operates preferentially in the control device to reduce the engine output to the minimum output in the event of a car failure, and a return spring that always biases the throttle valve in the direction of closing.
It may be possible to increase safety. As described above, in the present invention, the pulse motor connected to the throttle valve and at least one
A manipulated variable sensor that generates a pair of pulse signals with different phases and whose number of pulses corresponds to the manipulated amount of an operating member such as an accelerator pedal, and a manipulated variable sensor that moves the operating member based on the phase difference between the pulse signals. A direction determination circuit that determines the direction and determines the rotating direction of the pulse motor according to the movement direction, and an output circuit that rotates the pulse motor by an angle corresponding to the number of pulses of the pulse signal. Because of this, it is possible to prevent the throttle valve from closing incorrectly, and to perform closed-loop control that does not require a potentiometer to detect the opening of the throttle valve.Moreover, the opening of the throttle valve can be adjusted in response to the amount of operation of the operating member. It has an excellent effect of being able to control accurately. Furthermore, since the moving direction of the operating member is determined from the phase difference between the pulse signals of the operating amount sensor, the moving direction can be determined in real time, and the operation of the operating member can be followed with good responsiveness. Furthermore, by adding a separate external signal generator, it is possible to easily carry out pre-programmed unmanned operation, vehicle speed maintenance operation, and automatic start-up warm-up operation.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a perspective view showing an accelerator pedal, and FIG. 2 is a perspective view showing an accelerator pedal.
The figure is a partially cutaway perspective view showing the manipulated variable sensor, and Figure 3 is an electric circuit diagram showing the amplifier circuit and control unit.
FIG. 4 is a partially sectional plan view showing the throttle valve and pulse motor. 5 and 6 are graphs used to explain the operation of the present invention. DESCRIPTION OF SYMBOLS 1... Accelerator pedal forming an operating member, 10... Operation amount sensor, 68... Throttle valve, C... Direction determination circuit, E... Output circuit, M... Pulse motor.

Claims (1)

[Scope of Claims] 1. A throttle valve control device comprising a throttle valve that controls the amount of air-fuel mixture supplied to the engine, and an operating member that adjusts the opening degree of the throttle valve, comprising: a pulse motor connected to the throttle valve; a manipulated variable sensor that generates at least one pair of pulse signals with different phases and whose number of pulses corresponds to the manipulated variable of the operating member; a direction determination circuit that determines the moving direction of the member and determines the rotating direction of the pulse motor according to the moving direction; and an output circuit that rotates the pulse motor by an angle corresponding to the number of pulses of the pulse signal. A throttle valve control device comprising: