CHANGEEOVER CONTROL DEVICE FOR VEHICLE SUBBGEAR REDUCTION DEVICE

摘要

PURPOSE:Shift control signal is fed to a sub-transmission device in response to an operational condition of the vehicle and a shift-down control signal is fed out when the brake pedal is depressed and a proper change-over of sub-transmission device is performed. CONSTITUTION:Calculation control device 40 sends a shift-up signal or shift-down signal to the change-over control device of sub-transmission device in reference to a signal which the vehicle speed signal producing device 42 and the throttle signal producing device 48 generate. When the brake pedal is further depressed more than that of specified period, the switch 55 is closed, the engine brake control device 59 produces a shift-down signal independent of an output signal of the calculation control device 40 to make a shift-down condition of the sub-transmission device and to improve an effect of the engine brake.