The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1995
Filed:
Jan. 07, 1994
Toshikazu Obaraki, Susono, JP;
Naoto Kushi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A novel device of the present invention detects an abnormal driving condition where a sub-throttle valve pressed in a full-opening direction by means of a spring is abruptly driven in the full-opening direction due to an abnormal condition of an actuator, and controls an internal combustion engine according to the requirements. A difference DLTA in an opening TA of a sub-throttle valve 34 within a preset time period is determined (steps S100 through S130) and then compared with a predetermined range allowing to be driven by a stepping motor 32 (step S140). The sub-throttle valve 34 is pressed in a full-opening direction by means of a spring 54. In case of a step-out of the stepping motor 32, the sub-throttle valve 34 is abruptly driven in a full-closing direction by the spring 54. When an abrupt change of the sub-throttle valve 34 is detected, a process under abnormal conditions (abnormality process) including reduction of fuel injection is implemented (step S160). However, when a manifold negative pressure is not abruptly changed while an abnormal condition of the stepping motor 32 is detected, the abnormality process may not be executed since no abrupt variation in the air intake is expected. When an abrupt change in the manifold negative pressure is detected, on the other hand, an ISC valve is closed to compensate for the abrupt change.