Abstract:
A clutch system comprises a hydraulic control circuit for controlling a hydraulic system. The hydraulic control circuit comprises processor-executable control instructions to perform a method for controlling hydraulic pressure. The method comprises receiving a target hydraulic pressure. The method generates and outputs pressure control valve commands based on a detected current hydraulic pressure, a detected temperature, and the target hydraulic pressure by implementing proportional integral derivative (PID) calculations and sliding mode calculations while carrying out a closed loop pressure control. The method converts the target hydraulic pressure into motor speed control commands and into motor direct current commands by implementing a linear quadratic regulator (LQR) calculation while carrying out a closed loop speed control. The method controls the electric motor using the motor direct current commands. And, the method controls the pressure control valve by using the pressure control valve commands.
Abstract:
A system for controlling pressure in a transmission comprises a transmission control unit 102, a valve controller 104 that receives a desired pressure 202 as input from the transmission control unit 102, a valve driver 108, a valve 112 that regulates an amount of fluid in a transmission clutch 106, and a pressure transducer that reads a pressure in the transmission clutch 106 and outputs a pressure reading 204 to the valve controller 104, wherein the valve controller 104 comprises logic for outputting to the valve driver 108 an instruction for controlling the valve 112, the instruction being formulated using the desired pressure 202 and the pressure reading 204.
Abstract:
A starting clutch control device controls such that the transmission torque capacity of a starting clutch (clutch torque) becomes a value required to transmit a torque equal to an engine absorption torque at the time of power-off running. A control of gradually increasing a clutch torque is carried out with a delay after an accelerator pedal is depressed during power-off running, to thereby prevent the occurrence of surging vibrations when an accelerator pedal is abruptly depressed during power-off running.
Abstract:
A control device (1) for controlling a clutch (6) of a vehicle wherein an actuator (8) is connected to and provides for operating the clutch (6), the work position of which is determined by a position sensor (33) which supplies a measured position signal (P MIS ) to a control device (34, 59) receiving an information signal (S INF ) and supplying a control signal (I, V) for the actuator (8); the control device (1) has a monitor circuit (32) for determining malfunctioning of the position sensor (33) and supplying a fault signal (COM); and a virtual sensor device (38) for estimating the work position of the clutch (6) to supply the control device (34, 59), in the presence of the fault signal (COM), with a virtual position signal (S PV ) instead of the measured position signal (P MIS ).
Abstract:
An automatic control strategy for use with a multiple-ratio transmission in an automotive vehicle driveline in which the crankshaft (14) of an internal combustion engine (12) is connected directly to torque input elements of a multiple-ratio gearing (10,22,24) without an intervening hydrokinetic torque converter. The strategy is adapted especially for use with a wet auto clutch to provide forward or reverse drive engagement during vehicle launch and during transient damping of driveline disturbances. The strategy makes it possible to control the clutches (116) to achieve maximum vehicle acceleration by controlling the engine speed so that it operates at maximum torque throughout the useful engine speed range for any given engine throttle position. The entry and exit conditions for each drive mode are determined by the strategy so that optimum drive-away performance and optimum shift control, as well as soft clutch engagement and full clutch engagement, can be achieved.