JPH01142224A - Throttle valve control device for engine - Google Patents

Abstract

PURPOSE:To improve the high-speed responsiveness by arranging multiple first throttle valves with cylindrical passages in parallel, opening or closing the cylindrical passages with the second throttle valves, and controlling the throttle valves with electronic control actuators respectively. CONSTITUTION:The first throttle valves 2 and 3 provided with cylindrical passages 2c and 3c are rotatably arranged in an air intake pipe 1, the second throttle valves 4 and 5 constituted of butterfly valves are rotatably arranged in the cylindrical passages 2c and 3c. The second throttle valve 4 is opened or closed by a valve stem 6 supported by cylindrical shaft sections 2a and 2b, the second throttle valve 5 is opened or closed by a valve stem 7 supported by cylindrical shaft sections 3a and 3b. Gears 8 and 14 provided on the valve stems 6 and 7 are engaged with each other, on the other hand gears 9 and 15 provided on the cylindrical shaft sections 2a and 3a are engaged with each other, and they are rotatively controlled by electronic control actuators 13 and 12 respectively via prime mover gears 11 and 10.

Description

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

[Conventional technology]

Recently, as part of engine control to improve exhaust purification performance and fuel efficiency, the mechanical connection between the throttle valve and the accelerator pedal has been eliminated, and a signal that converts the amount of accelerator depression into an electrical quantity (accelerator depression amount signal) has been used. 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 signals representing the engine operating state or vehicle running state (e.g. engine speed signal, gear position signal, etc.) is progressing. There is.

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 a calculation control unit 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: (1) 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 electronically controlled actuator when control becomes impossible. 3) 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 is disclosed in Japanese Patent Application Laid-Open No. 145867/1983.

[Problem that the invention seeks to solve]

However, in these conventional examples, if the electronically controlled actuator becomes inoperable, although it is possible to prevent the vehicle from running out of control, it is not possible to maintain the vehicle running, and it is also impossible to move the vehicle to a predetermined location for repair. There was a problem with it disappearing.

The present invention has been made to solve these conventional problems, and an object of the present invention is to provide a throttle valve control device for an engine that is highly reliable and also has excellent high-speed response.

[Means for solving problems]

The throttle valve control device for an engine according to the present invention includes a plurality of first throttle valves arranged in parallel and each having a cylindrical passage through which intake air sucked into the engine flows, and a plurality of first throttle valves that open and close the cylindrical passages, respectively. a second throttle valve; a first throttle valve; It is provided with two independent electronically controlled actuators or accelerator pedals for rotationally driving the second throttle valve, and an opening sensor that detects the relative rotation angle of the first and second throttle valves.

[For production]

In this invention, the first throttle valve and the second throttle valve are individually driven to rotate in conjunction with the operation of an electronically controlled actuator or an accelerator pedal. The relative rotation angle of the second throttle valve is changed to control the intake air amount of the engine.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a throttle valve control device for an engine according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG.

In both FIGS. 1 and 2, 1 is an air intake pipe of an engine (not shown), 2 and 3 are first throttle valves, and the first throttle valves 2 and 3 are air intake pipes of an engine (not shown). Cylindrical shaft portions 2a, 2b and 3a, 3 are respectively pivotally supported on the suction pipe 1.
b, and is provided rotatably within the air suction pipe 1.

These first throttle valves 2 and 3 are respectively provided with cylindrical passages 2c and 3c through which intake air to the engine flows.

Further, the second throttle valves 4 and 5 are connected to the cylindrical passages 2c and 3.
It is made up of butterfly valves that open and close C.

The valve shaft 6 is pivotally supported by the cylindrical shaft portions 2a and 2b, and is adapted to open and close the second throttle valve 4.

Further, the valve shaft 7 is supported by cylindrical shaft portions 3m and 3b, and opens and closes the second throttle valve 5.

A gear 8 is connected to the valve shaft 6, a gear 14 is connected to the valve shaft 7, and both gears 8 and 14 mesh with each other.

Further, a gear 9 is coupled to the first throttle valve 2, and a first driving gear 10 meshes with the gear 9 to rotate the first throttle valve 2 around the valve shaft 6. .

Similarly, the second driving gear 11 meshes with the gear 8 to rotationally drive the second throttle valve 4.

On the other hand, reference numerals 12 and 13 denote first and second electronically controlled actuators, which include DC drive motors 12a and 13a, and current control circuits 12b and 13b that supply current to these, respectively.
It is composed of.

The first and second driving gears 10 and 11 are rotationally driven by output shafts of drive motors 12a and 13a, respectively.

The gear 8 is rotationally driven by this second driving gear 11,
Along with this, the gear 14 that meshes with the gear 8 is also rotated at the same time, and the second gear 14 is also driven to rotate. The throttle valves 4.5 are opened and closed at the same time.

A gear 15 is connected to the first throttle valve 3, meshes with the gear 9, and is rotationally driven by the first driving gear 10, so that the first throttle valves 2 and 3 are opened and closed at the same time.

Reference numeral 16 denotes an opening sensor comprised of, for example, a potentiometer, which detects the relative rotation angle (relative opening) of the first and second throttle valves 3 and 5.

On the other hand, the arithmetic control unit 17 includes 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 V), and an accelerator pedal 2 that is operated by the driver.
The output signals from the accelerator sensor 19 that detects the amount of depression of 0 are input, and predetermined arithmetic processing is performed on the values of these input signals to control the first and second throttle valves 3,
The target relative rotation angle θt of 1. This is an arithmetic control unit that outputs rotation command signals DI and D2 to the second electronically controlled actuator 12.13. In addition,
21 is a return spring for the accelerator pedal 20.

Next, the operation will be explained. The rotational driving force of the first electronically controlled actuator 12 is transmitted from the first driving gear 10 to the gear 9 and the gear 15, which are arranged in parallel to each other.
The throttle valves 2 and 3 are simultaneously driven to rotate.

On the other hand, the rotational driving force of the second electronically controlled actuator 13 is transmitted from the second driving gear 11 to the gear 8 and the gear 14, and rotationally drives the two second throttle valves 4 and 5 at the same time.

The first and second throttle valves 2, 4 and 3, 5 shown in FIG.
As the relative rotation angle θ increases, the cylindrical passages 2c and 3c
The air passages within the engine become narrower, reducing the amount of intake air drawn into the engine.

The relative rotation angle θ can be changed by rotating either the first throttle valve or the second throttle valve, or can be quickly changed by rotating both in opposite directions.

For the drive unit operating as described above, the arithmetic control unit 17 calculates the target relative rotation angle θt of the throttle valve from the information of the accelerator opening A2, the engine rotation speed N, and the vehicle speed V, and
Rotation command signals DI and D2 are output to the first and second electronic split actuators 12 and 13, respectively, so that the deviation from the actual relative rotation angle θ obtained from the output signal r becomes zero.

These rotation command signals Di and D2 are supplied to the drive motor 12a.

Rotation direction 2 energization (rotation) according to the operation mode of 13a,
It consists of contents such as de-energization (stop). In the throttle valve control device according to this embodiment, unless both the first and second electronically controlled actuators 12, 13 become malfunctioning, there will be a small amount of damage (if either one operates, the cylindrical passage 2a will be closed).

The opening/closing operation of 3C is controllable, and when both actuators are operated, the opening/closing operation is fast and the responsiveness can be about twice as high as when using only one actuator.

Note that in the above embodiment, the first throttle valves 2 and 3 and the second
Although the rotation control of the throttle valves 4 and 5 is controlled by the first and second electronically controlled actuators 12 and 13, respectively, it is possible to connect the first throttle valve or the second throttle valve mechanically to the accelerator pedal. , it may be configured to be operated directly by the accelerator pedal, and the same effect as the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, in the invention of B, a plurality of first throttle valves each having a cylindrical passage through which intake air to be drawn into the engine flows are arranged in parallel, and the cylindrical passage of the first throttle valve is arranged in parallel. 2nd each
By opening and closing the first and second throttle valves using an electronically controlled actuator or accelerator pedal, the relative rotation angles of the first and second throttle valves are changed to adjust the intake air amount of the engine. Since it is configured to be controlled, there is an effect that reliability is high and responsiveness is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a throttle valve control device for an engine according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 1--2 in FIG. DESCRIPTION OF SYMBOLS 1... Intake air pipe, 2, 3... First throttle valve, 4°5... Second throttle valve, 10... First driving gear, 1
1... Second driving gear, 12... First electronic control 1
Cutieator, 13... Second electronically controlled actuator, 16... Opening sensor, 17... Arithmetic control unit, 1
8...Sensor, 20...Accelerator pedal〇In addition, the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A plurality of first throttle valves each having a cylindrical passage through which the intake air of the engine flows and arranged in parallel, and each having the same center as the first throttle valve so as to open and close the cylindrical passage, respectively. a plurality of second throttle valves rotatably held in a line; a first driving means that connects and simultaneously drives the plurality of first throttle valves; and a plurality of second throttle valves. a second driving means that connects the valves and simultaneously drives the valves to rotate while changing a relative rotation angle with respect to the first throttle valve; and an opening sensor that detects the relative rotation angle of the first and second throttle valves. Engine throttle valve control device with. (2) The first drive means and the second drive means perform predetermined arithmetic processing on the operating state of the engine, the running state of the vehicle, and the output signal of the accelerator sensor to adjust the first and second apertures. A calculation that calculates a target relative rotation angle of the valve, compares it with an output signal of an opening sensor that detects the relative rotation angle of the first and second throttle valves, and outputs a rotation command signal according to the deviation amount. first and second throttle valves including a control unit, a current control circuit controlled based on the rotation command signal, and motors supplied with current by the current control circuit to individually drive the first throttle valve and the second throttle valve; 2. A throttle valve control device for an engine according to claim 1, further comprising an electronically controlled actuator. (3) The throttle valve control device for an engine according to claim 1, wherein the first and second driving means are each an accelerator pedal operated by a driver.