Automated Manual Transmission 1 Introduction: The design of the robotised control system for C510 gearboxes is directed towards improving the performance of the components of the manual mechanical transmission. This system is designed to automate the controls for the clutch and gear lever of a conventional mechanical gearbox using electro hydraulic actuation unit. This system: Improves the performance of the manual mechanical transmission components. Stops the driver having to control the clutch pedal and conventional gear lever. Improves driving safety by means of the control that prevents driver errors and impedes incorrect manoeuvres on the transmission system. Offers the driver a more advanced car interface. It is a hydraulic power assisted system for transmission and clutch, which allows all the qualities of a dry clutch and manual gearbox to be retained (loads, strength and reliability, low energy consumption). Simplifies use and reduces fatigue when driving especially in towns. Ensures comfortable or sporty gear changes thanks to the advanced logics of TCU (Transmission Control Unit). There is no clutch pedal in the passenger compartment and the gear shift lever is replaced by controls: Neutral/Reverse/First gear and A/M from gear shift lever. The transmission may be automatically managed in "AUTO" / “SPORT" and "AUTO" /"NORMAL" mode. The robotised gearbox has two operating modes: SEMI-AUTOMATIC MODE (MANUAL): The driver manages gears shifts using the lever located on the tunnel. AUTOMATIC (AUTO) MODE: The electronic system manages the decision to change gear in accordance with two strategies, the first dictated by driving comfort (NORMAL) and the second for performance (SPORT). The AMT unit consists of a hydroelectric unit (2) mounted directly on the gearbox casing, which has the purpose of managing clutch opening and operating the gear control shaft (selection and engagement). An electric pump and an accumulator (1) provide the hydraulic power required by the solenoid valves which operate the electro hydraulic unit. Having identified the driver's requests from GSL (Gear Shifter Lever), an electronic control unit manages the gear change independently, controlling the clutch, gearbox and engine torque directly. During gear change, the engine control is assisted by the gear control. The interface between the gearbox and the engine improves the performance of the system considerably and frees the driver from any need to synchronies clutch-accelerator movements during gear changes which can be carried out with the accelerator fully depressed (it is advisable not to release it). The system inhibits incorrect gear change requests and avoids unwanted engine shut down. In terms of driving assistance it also ensures the immediate availability of first gear when the vehicle stops and automatic downshifting in the event of hard deceleration. The gear indication is displayed on an integrated display on the instrument panel, as are the indications of faults of critical driving
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