Automated Manual Transmission 10 Line Pressure Sensor: It is fitted directly on the hydraulic unit, is made up of a sensitive capacitive element that generates a signal processed by a special custom circuit located inside the metal body, and provides the control unit with a voltage proportional to the pressure read with reference to the supply voltage of the sensor. The supply voltage for the control unit is 5 +/- 0.5 V with absorption of about 10 mA. The maximum pressure value read is about 80 bar. Clutch Rpm Sensors: It is fitted on the gearbox input directly on the gearbox casing. It is an electromagnetic sensor and supplies the control unit with a sinusoidal signal whose frequency is proportional to the speed of a pinion mounted on the main transmission shaft. The winding resistance is 1200 ohm +/- 10% at 20°C. The gap is between 0.2 and 1 mm, the rotation (speed) of a gear on the main transmission shaft is read. Engagement and Selection Position Sensors: The sensors which transmit the position of the gear selection and engagement actuators to the TCU are Hall effect sensors fitted directly on the electro hydraulic unit. They are supplied with 5 V +/- 0.5 V directly by the control unit. The voltage response that arrives at the TCU depends on the sensor rotation and is linked to the magnetic field variation. The two sensors of the same type fitted on the electro hydraulic unit are: P.S. Gear selection position sensor P.I. Gear engagement position sensor CSC Clutch Actuator: The CSC is a traditional hydraulic cylinder, coaxial with the gearbox main shaft. Its (annular) piston is in contact with the clutch diaphragm spring by means of the thrust bearing. The piston is held in rest position by the reaction of the diaphragm spring. Consequently, the clutch is normally closed if there is no pressure from the robot. A position sensor is present.
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