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:
Oct. 13, 1992
Filed:
Apr. 17, 1990
Yutaka Ninoyu, Oobu, JP;
Nippondenso Co. Ltd., Kariya, JP;
Abstract
An apparatus for controlling speed of a vehicle to consist with a target speed in cruising mode, the vehicle having power transmission for selecting a gear ratio from plural predetermined gear ratios comprising: detector means for detecting the speed; and controller: for producing a first control signal for effecting downshifting to high when the speed decreases under the target speed; for detecting increase rate of the speed in response to the first control signal; and for producing a second control signal for effecting upshifting in response to said first control signal with delay determined by the increase rate. A negative pressure pump may be further provided for driving a negative pressure actuator controlling a throttle valve, the pump is turned on when the speed decreases under a given value before detection of lack of negative pressure downstream from a throttle valve, for driving negative pressure actuator controlling the throttle valve. A fail-safe system may be further provided which detects excessive flow rate of air-fuel mixture due to trouble at the negative pressure actuator in cruising mode for preventing unintentional and rapid acceleration.