Features of the hydromechanical gearbox type 01 (VW Passat B4)

Fig. 4-58 shows the components of the 01 M type automatic transmission. The electronic control unit is installed on vehicles with 2E, ABS, 1Z, AFN engines manufactured since January 1995 and the 2E engine manufactured since June 1996. The electronic control unit of the hydromechanical transmission issues commands to the electromagnetic control valves of the valve box, generated on the basis of information received from the vehicle speed sensor, the transmission speed sensor, the engine crankshaft speed sensor through the integrated engine management system controller, from the potentiometric accelerator pedal position sensor (which includes the kick-down forced reverse shifting system switch), from the gearbox oil temperature sensor, the brake light switch and the multifunctional sensor (Fig. 4-51).





Depending on the information received, the control unit issues commands to the electromagnetic valves of the valve box (Fig. 4-52), the electromagnetic lock of the selector lever (with ignition on) and the starter interlock relay (with any gear engaged).





The control unit operates on fuzzy logic (or with deliberate inaccuracy), i.e. taking into account all the intermediate states that occur between the main states (0-1 in binary logic).

Thanks to this, the operation of the hydromechanical gearbox adapts to the driving style, engine characteristics and driving conditions (rolling resistance of wheels). The gearbox does not have "economical" and "sport" modes.

Electronic control unit 68-valve.

The applicability of gearbox types and their gear ratios are given in Tables 4-7 and 4-8.