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:
Nov. 06, 1990
Filed:
Nov. 21, 1988
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A system and method for controlling a rotation of drive wheels for a vehicle in which a slippage (slip rate in percentage) between the drive wheels and a road surface on which the vehicle runs is calculated on the basis of a drive wheel rotation speed and a vehicle body speed, a plurality of different predetermined slippages, each representing a magnitude of a slip occurrence are stored, and a plurality of different characteristic graphs, each representing a relationship between opening angles of a first throttle valve associated with an accelerator and of a second throttle valve installed in series with the first throttle valve in an intake air passage of a vehicular engine are stored. Then, one of the characteristic graphs is selected to use the control of the opening angle of the throttle valve according to a change of the slip occurrence in such a way that when the slippage increases and exceeds one of the predetermined slippages, the opening angle of the second throttle valve is decreased toward its fully close position with respect to that of the first throttle valve and when the slippage decreases and becomes below one of the predetermined slippages, the opening angle of the second throttle valve is increased with time toward its original fully open position.