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:
Jun. 30, 1987
Filed:
Mar. 15, 1984
Nobuo Habu, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A method and apparatus for automatically indicating speed change operations for a car having a manual type transmission and an electronic control unit having a CPU, a ROM and a RAM in which the method comprises the steps of preliminarily storing at least a data map corresponding to equal fuel consumption rate curves into the ROM of the microprocessor, calculating engine load Q/N in accordance with the current engine speed N and intake air flow Q, calculating V.sub.D.K-Q.sub.D from absolute values of the car speed variables V.sub.D and the intake air flow variables Q.sub.D (K indicates correlation factor) at predetermined time points respectively, comparing and determining if the V.sub.D.K-Q.sub.D is below 0 (zero), and indicating either a shift-up or a shift-down operation on a display or refraining from carrying out the speed change determination during the running on a slope in accordance with the result of the determination. The driver of the car having the electronic control unit including the CPU, the ROM and the RAM can run the car under optimum fuel consumption rate for the engine in accordance with the indication of either the shift-up operation or the shift-down operation to be taken by the driver.