Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1988-07-08
1990-03-20
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123399, F02D 4114, F02D 902, F02D 1110
Patent
active
049092146
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a throttle valve control device of an automobile engine and, particularly, to such device in which a throttle valve of the engine is controlled by an electronic controlled actuator.
BACKGROUND OF TECHNOLOGY
Recently, as a portion of an engine control for improving the feeling of running and the fuel economy of an automobile, a throttle valve control by means of an electronic controlled actuator which does not use any mechanical linkage between a throttle valve and an acceleration pedal and controls an opening of the throttle valve in response to an electric signal obtained by converting an amount of depression of an acceleration pedal and other signals such as engine rotation signal which is representative of engine operating condition and gear position signal which is representative of automobile running condition has been developed.
In the throttle valve control device using such electronic controlled actuator, the throttle valve opening is regulated by a driving motor actuated upon instructions from an automobile control device comprising an operation control portion for sequentially operating an optimum throttle opening according to signals representative of an engine operating condition and automobile running condition. Therefore, it is necessary to have a safety device capable of preventing an uncontrolled running of the automobile even if the electronic controlled actuator becomes inoperative during running of the automobile, and examples of such safety device are shown in Japanese Patent Application Laidopen No. 145867/1980 as
(1) provision of a return spring on a throttle shaft which functions to return a throttle valve to a closed position when a control is lost,
(2) provision of an electromagnetic clutch for disconnecting a throttle shaft from an electronic controlled actuator when it becomes uncontrollable, or
(3) provision of a construction which is a combination of a return spring and an electromagnetic clutch and functions to make the return spring effective when the electromagnetic clutch is separated.
In the conventional schemes such as above, however, once the electronic controlled actuator becomes inoperative, it is impossible to maintain a running of an automobile and thus it becomes impossible to move the automobile to a repairing place, although it is possible to prevent an uncontrolled running of the automobile.
The present invention was made in view of solving this problem and an object of the present invention is to provide a throttle valve control device which is highly reliable and has a high speed response.
DISCLOSURE OF THE INVENTION
That is, the throttle valve control device according to the present invention comprises a first and a second driving motors which are independent on each other and a driving force conversion mechanism which combines rotational movements of these driving motors and converts a combined movement into a linear movement. The first and the second driving motors are controlled on the basis of control signals from an operation control portion for calculating an optimum throttle opening sequentially. With this construction, the throttle valve opening can be controlled so long as both the first and the second driving motors become inoperative. When both of the driving motors are operative, an operation speed of the throttle valve becomes twice that when one of the motors operates, resulting in a highly safe control device which is inexpensive and has a high response speed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a general construction of an automobile control device including the present throttle valve control device and FIGS. 2 and 3 show concrete embodiments of the present invention, respectively.
BEST MODE FOR PRACTICING THE PRESENT INVENTION
The present invention will be described in detail with reference to the drawings.
FIG. 1 shows a general construction of an automobile control device including the present throttle valve control device, in which 1 depicts an air suction tube of
REFERENCES:
patent: 4161994 (1979-07-01), Collonia
patent: 4601271 (1986-07-01), Ejiri et al.
patent: 4612615 (1986-09-01), Murakami
patent: 4727840 (1988-03-01), Nishida et al.
patent: 4768483 (1988-09-01), Asayama
patent: 4809656 (1989-03-01), Suzuki
Mitsubishi Denki & Kabushiki Kaisha
Sougou Jidousha Anzen Kougai Gijutsu Kenkyu Kumiai
Wolfe Willis R.
LandOfFree
Throttle valve control device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Throttle valve control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Throttle valve control device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-785271