Title:
THROTTLE VALVE CONTROL DEVICE FOR AN INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/1997/022787
Kind Code:
A1
Abstract:
A throttle valve control device for an internal combustion engine characterized in that a throttle valve is rotatably mounted on a throttle body via throttle shaft, that the configuration of a bore in the inner surface of the throttle body is a straight bore type in which the centre of rotation of the throttle valve is located on the centre line of the throttle body, that a spherically surfaced internal profile portion is provided in an idle control area which is in the vicinity of the fully closed angle of the throttle valve, that a spherically surfaced internal profile portion is further provided as an area continuing from the sphrically surfaced internal profile, that provided as an area continuing from the spherically surfaced internal profile is an area comprising a compound surface profile comprising in turn a spherical surface and a cylindrical surface substantially parallel to a flow of air or an area comprising a conical surface profile, and that the centre of the spherically surfaced profiles is on the centre line of the bore and vertically offset, whereby a gap between the spherical surface profile and the throttle valve increases as the opening of the throttle valve increases. When applied to an electronically controlled throttle valve control device, the device is designed such that an engine rotational speed changes 20 rpm for each incremental throttle valve opening of 0.10 in a low throttle valve opening area, thereby eliminating an idle control by an ISC valve.
Inventors:
NISHIMURA MITSUNORI (JP)
ADACHI HIDEFUMI (JP)
HASHIMOTO YOSHIKATU (JP)
ADACHI HIDEFUMI (JP)
HASHIMOTO YOSHIKATU (JP)
Application Number:
PCT/JP1996/002375
Publication Date:
June 26, 1997
Filing Date:
August 26, 1996
Export Citation:
Assignee:
HITACHI LTD (JP)
NISHIMURA MITSUNORI (JP)
ADACHI HIDEFUMI (JP)
HASHIMOTO YOSHIKATU (JP)
NISHIMURA MITSUNORI (JP)
ADACHI HIDEFUMI (JP)
HASHIMOTO YOSHIKATU (JP)
International Classes:
F02D9/10; F02D11/10; (IPC1-7): F02D9/10
Domestic Patent References:
| WO1995006808A1 | 1995-03-09 | |||
| WO1995009978A1 | 1995-04-13 | |||
| WO1994012781A1 | 1994-06-09 |
Foreign References:
| JPH07269377A | 1995-10-17 | |||
| JPH05296067A | 1993-11-09 | |||
| JPS59113242A | 1984-06-29 |
Other References:
See also references of EP 0869266A4
Download PDF: