| 摘要 |
A fail-safe device for an automatic transmission system outputs a signal to control the transmission operation according to vehicle speed and engine rpm (revolution per minute) when normal transmission operation is not achieved because of a malfunction of input equipment or an automatic transmission controller. The device includes a vehicle driving sensor, a signal converter, a signal processor, and a signal-output member. The vehicle driving sensor outputs a corresponding signal by sensing both a vehicle speed and an engine rpm that are varied according to a vehicle driving state. The signal converter is connected with the vehicle driving sensor, and converts the signal from the vehicle driving sensor into the corresponding AC (alternating current) voltage by varying each pulse generating rate according to the vehicle speed and the engine rpm. The signal processor is connected with the signal converter, amplifies the AC voltage from the signal converter, compares the amplified AC voltage with the fixed reference voltage, combines a number of output signals, and outputs the driving signals of the first and second shift control solenoid valves. The signal-output member is connected with the signal processor, so as to vary the operating state through the reset signal from the automatic transmission controller, and controls the output signal from said signal processor. |
