JPH01159429A - Throttle valve controller for engine - Google Patents

Abstract

PURPOSE:To make improvements in control stability and responsiveness or the like by installing a first throttle valve provided with a tubular passage for intake air and a second throttle valve, opening or closing the tubular passage, respectively, and controlling an intake flow rate after changing a relative turning angle of each throttle valve. CONSTITUTION:A first throttle valve 2 provided with a tubular passage 3 is rotatably supported on an intake pipe 1 of an internal combustion engine via two tubular shaft parts 2a, 2b. In addition, there is provided with a second throttle valve 4 which opens or closes the tubular passage 3 of the first throttle valve 2, and its valve stem 5 is supported on these tubular shaft parts 2a, 2b. Each of these throttle valves 2, 4 is driven by each of electrically controlled actuators 10, 11 via respective transmission means 6-9. In addition, these actuators 10, 11 are controlled by an arithmetic control part 20 on the basis of each detection signal out of various sensors 12, 18 and 19 which detect the driving state of a vehicle and internal combustion engine. On the other hand, in the tubular passage 3, there is provided with a guide hole 21 which takes out the internal pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a throttle valve control device, and more particularly to a device for controlling a throttle valve of a vehicle engine using an electronically controlled actuator.

[Prior art] Recently, as part of engine control to improve exhaust purification performance and fuel efficiency, the throttle valve and the accelerator pedal have been mechanically connected (and a signal that converts the amount of accelerator depression into an electric quantity) has been developed. Progress is being made in the development of a throttle valve control device using an electronically controlled actuator that controls the opening and closing of the throttle valve in response to other signals (e.g., engine speed signal, gear position signal, etc.) representing the engine operating state or vehicle running state. It is being

In this electronically controlled actuator-based throttle valve control device, the opening and closing of the throttle valve is controlled by a vehicle control device comprising an arithmetic control section that sequentially calculates the optimum opening degree in response to signals representing engine operating conditions or vehicle running conditions. Since this is done by a drive motor that operates in response to a command, it is necessary to install a safety device to prevent the vehicle from running out of control even if the electronically controlled actuator becomes inoperable while the vehicle is running. Examples of such safety devices include ( +) A configuration in which a return spring is attached to the throttle shaft to return the throttle valve to the closed position when control is stopped, (2) A configuration in which an electromagnetic clutch is installed to disconnect the throttle shaft from the electronic control actuator when control is lost, (3) JP-A-55-145867 discloses a configuration in which a return spring and an electromagnetic clutch are combined and the return spring is activated when the electromagnetic clutch is disengaged.

[Problems to be Solved by the Invention] However, in these conventional examples, once the electronically controlled actuator becomes inoperable, it is possible to prevent the vehicle from running out of control, but it is not possible to maintain the vehicle's running, and the specified time is required for repair. There was a problem in that it became impossible to move the vehicle to another location.

SUMMARY OF THE INVENTION An object of the present invention is to provide an engine throttle valve control device that is highly reliable and has excellent high-speed response.

[Means for solving problems]

In the throttle valve control device according to the present invention, a first throttle valve having a cylindrical passage through which intake air sucked into an engine flows, and a second throttle valve that opens and closes the cylindrical passage are each equipped with separate electronic The throttle valves can be rotationally driven by a control actuator, the relative rotation angles of both throttle valves can be detected by an opening sensor, and the pressure in the cylindrical passage can be detected by a guide hole.

[For production]

In this invention, since the first and second throttle valves are individually rotationally driven by their respective electronically controlled actuators, the opening and closing operations of the throttle valves are possible even if one of the electronically controlled actuators fails. Further, during normal operation, the throttle valve opening degree added by the two electronically controlled actuators is obtained, so the opening/closing speed of the throttle valve can be substantially increased. Furthermore, by providing a guide hole in the cylindrical passage of the first throttle valve,
The pressure inside the cylindrical passage is detected, and a stable pressure change can be obtained in accordance with the relative rotation angle of the first and second throttle valves.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows the overall configuration of the throttle valve control device according to the present invention, and FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1. In the figure, 1 is an air suction pipe of an engine (not shown), 2 is a cylindrical shaft part supported by this suction pipe 1, and 2 is a cylindrical passage 3 having 2a and 2b, through which intake air to the engine 1 flows. 4 is a second throttle valve that opens and closes the cylindrical passage 3 of the first throttle valve 2; 5 is a cylindrical shaft portion 2a;

The valve shaft of the second throttle valve 4 is supported by the shaft 2b.

6 is a gear coupled to one end of the valve shaft 5; 7 is a gear coupled to the cylindrical shaft portion 2a of the first throttle valve 2; 8 meshes with the gear 7 to rotationally drive the first throttle valve 2; A first driving gear 9 meshes with the gear 6 and rotates the second throttle valve 4, and 10.11 rotates the first and second driving gears 8.9, respectively. The actuators are electronically controlled actuators that are driven by DC motors 10a and lla, and current control circuits 10b and llb that supply current to the motors. Reference numeral 12 denotes an opening sensor including a potentiometer or the like that detects the relative rotation angle (relative opening) of the first and second throttle valves 2.4. Reference numeral 20 denotes a sensor 18 that detects the engine operating state (for example, rotational speed N) and the running state of the vehicle (for example, vehicle speed ■), and an accelerator pedal 13 operated by the driver.
The target relative rotation angle of the first and second throttle valves 2 and 4 is determined by inputting the output signals from the sensor 19 that detects the amount of depression of the throttle valve and performing predetermined arithmetic processing on the values of these input signals. The electronically controlled actuator 1 outputs θ1 and compares it with the output signal θ of the opening sensor 12, and controls the electronically controlled actuator 1 according to the amount of deviation.
This is an arithmetic control unit that outputs rotation command signals DI and D2 at 0.11. I5 is a return spring of the accelerator pedal 13, 16 is a stopper of the accelerator pedal 13, and 21 is a guide hole provided in the cylindrical passage 3 of the first throttle valve 2;
1 takes out the pressure inside the cylindrical passage 3 to the outside, and connects the nipple 22
The fuel is supplied to devices that operate in response to pressure changes (for example, a negative pressure ignition timing adjustment device or an EGR valve).

Next, the operation will be explained. electronically controlled actuator
The rotational driving force of O is transmitted from the first driving gear 8 to the gear 7, and rotationally drives the first throttle valve 2.

On the other hand, the rotational driving force of the electronic '11m actuator 11 rotates the second throttle valve 4 via the second driving gear 9 and the gear 6. By the way, as shown in Figure 2, the first and second
As the relative rotation angle θ of the throttle valve 2.4 increases, the air passage within the cylindrical passage 3 becomes narrower, and the intake air drawn into the engine is reduced. This relative rotation angle θ can be changed by rotating either the first throttle valve 2 or the second throttle valve 4, or can be quickly changed by rotating both in opposite directions. The pressure within the cylindrical passage 3, which changes according to changes in the relative rotation angle θ, passes through two guide holes, is taken out from the nipple 22, and is used to operate a negative pressure type ignition timing adjustment device, an EGR valve, etc. For the drive unit that operates as described above, the arithmetic control unit 2° calculates the target relative rotation angle θ of the throttle valve from the information of the accelerator opening A, the engine speed N, and the vehicle speed V, and calculates the target relative rotation angle θ rotation of the throttle valve. Rotation command signals DI and D2 are provided to the electronically controlled actuators 10 and 11 so that the deviation from the actual relative rotation angle θ obtained from the output signal of is zero.
Output. These signals DI and D2 are applied to the motors 10a and ll.
The contents include the direction of rotation, energization (rotation), non-rotation (stopping), etc., depending on the operation mode of a. In the throttle valve control device according to the present invention, the cylindrical passage 3 can be opened and closed unless both electronically controlled actuators to and 11 become malfunctioning, and when both actuators are in operation, the throttle valve opens and closes quickly. speed is approximately twice as fast as with one actuator.

In addition, in the embodiment, the first and second throttle valves 2.4 are shown as using electronically controlled actuators 10.11, but it is also possible to connect the first or second throttle valves via an accelerator pedal and an accelerator wire. You may also operate it directly.

〔Effect of the invention〕

As explained above, according to the present invention, a first throttle valve having a cylindrical passage through which intake air flows to the engine, a second throttle valve opening and closing this cylindrical passage, and both throttle valves are individually arranged. It is equipped with an electronically controlled actuator that rotates to drive the engine, and a guide hole that extracts the pressure in the cylindrical passage, and controls the intake air amount of the engine by changing the relative rotation angle of the first and second throttle valves. Therefore, engine throttle valve control with high stability and excellent high-speed response can be realized. In addition, since a guide hole is provided in the first throttle valve to detect the pressure inside the cylindrical passage, a stable pressure change can always be obtained according to the relative rotation angle of the first and second throttle valves. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a throttle valve control device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1. l... Air intake pipe, 2... First throttle valve, 3...
Cylindrical passage, 4... second throttle valve, 5... valve stem, 6.
7... Gear, 8.9... Driving gear, 10.11...
・Electronic control actuator, 12... Opening sensor, 1
3... Accelerator pedal, 20... Arithmetic control unit, 21
...Guiding hole. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Masuo Oiwa 1. Cause 1 Figure 2 Procedural Amendment (voluntary) 1. Indication of the case: Japanese Patent Application No. 62-317823 2. Name of the invention Throttle valve control device of the organization 3. Representative of the person making the amendment: Shiki Moriya 5, Detailed description of the invention column and drawings (Figure 1) 6 of the specification subject to amendment,
Contents of the amendment (1) "Stability" on page 9, line 5 of the specification is corrected to "safety." (2) Correct Figure 1 as shown in the attached sheet. 7. Attached document catalog correction drawing (Figure 1) 1 or more copies No. 18

Claims (1)

[Claims] A first throttle valve having a cylindrical passage through which intake air to the engine flows, a second throttle valve that opens and closes the cylindrical passage, and the first and second throttle valves are each rotationally driven. It is characterized by comprising an electronically controlled actuator, an opening sensor that detects the relative rotation angle of the first and second throttle valves, and a guide hole for extracting the pressure inside the cylindrical passage of the first throttle valve. Throttle valve control device of the engine.