| 摘要 |
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 VD.K-QD from absolute values of the car speed variables VD and the intake air flow variables QD (K indicates correlation factor) at predetermined time points respectively, comparing and determining if the VD.K-QD 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.
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