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:
Mar. 21, 1989
Filed:
Jul. 06, 1987
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A cruise control system for a vehicle having an internal combustion engine provided with a throttle valve operated by a diaphragm actuator irrespective of a depression of an accelerator pedal by an operator of the vehicle. The system is provided with a system for controlling a vehicle speed in a so-called 'dead zone' where hunting usually occurs if a normal feedback control is executed. A time-interval integrating unit is provided for integrating the deviation of the acutal speed with respect to the target speed with a time interval as well as a weight factor, so that the integrated value corresponds to the change in the deviation in the dead zone. The integrated value is compared with a predetermined value corresponding to a change in the vehicle speed which is obtainable when the least significant bit in the control signal output to the actuator is changed. When the integrated value becomes equal to or higher than the predetermined value, the least significant bit is incremented or decremented, and thus speed control in the 'dead zone' becomes possible.