Abstract:
A vehicle system (10) is provided. The vehicle system comprises an electrical DC motor (11) driving a load (12), such as a hydraulic pump, and a control system (100) for controlling the speed of the electrical motor (11). The control system (100) comprises a system (20) for monitoring and controlling the speed of the electric DC motor in view of a reference commutation signal (S R ), wherein the electrical DC motor is associated with a drive current signal (I D ), and wherein the drive current signal (I D ) comprises information relating to the commutation signal of the electrical DC motor. The system (20) comprises a speed estimation unit (23) for estimating a commutation signal (S E ) from the drive current signal (I D ), said commutation signal (S E ) corresponding to an estimated motor speed; a filter unit (25) configured to apply a first filter on the drive current signal (I D ), said first filter being selected based on the estimated commutation signal (S E ), thereby resulting in a filtered drive current signal, and a speed detector unit (26) for detecting the actual commutation signal (S M ) from the filtered drive current signal. If the detection of the commutation signal (S M ) is unsuccessful the speed estimation unit (23) is based upon the receipt of a signal (S M-NO ) from the speed detector unit (26) configured to transmit an estimated commutation signal (S E ) to a control unit (28), wherein the control unit (28) is configured to provide a control signal comprising information of a comparison between the reference commutation signal (S R ) and the estimated commutation signal (S E ) and indicating a required updated drive signal (I D ).
Abstract:
A hydraulic system (10) for a vehicle is provided. The hydraulic system comprises a shifting mechanism (20) and a pump assembly (30) configured to provide pressurized fluid to said shifting mechanism (20), and an electrical motor (40). The movement of the shifting mechanism (20) controls a valve function which serves to open a connection from the pump assembly (30) to the electrical motor (40).
Abstract:
A coupling for an AWD vehicle comprises a disc package with alternate discs (6,7; 56, 57; 76, 77), which are connected for rotation with, but are axially movable in relation to an ingoing (1; 52, 71) and an outgoing axle (2; 51; 72), respectively, of the coupling, and a hydraulic piston (9; 59; 79) for pressing the disc package together under the action of hydraulic pressure, hereby establishing a connect mode, in which the ingoing axle is connected to the outgoing axle. A coupling slack adjuster (13-15; 64, 65; 83-85) is provided for mechanically establishing a rest position for the hydraulic piston (9; 59; 79) in a disconnect mode, in which a predetermined slack in the disc package is established, irrespective of the wear of the discs.
Abstract:
A gearbox (1) is placed in a drive train between an electric motor (12) and an engine (13) of a vehicle. The gearbox (1) is placed in direct connection to an output shaft (2) of the electric motor (12). The gear box (1) has means to place it in three different modes.
Abstract:
A disconnected, hydraulic disc coupling (4) in an AWD vehicle with a hydraulic cylinder (14) for its actuation is to be quickly connected or engaged. The effective piston area in the cylinder (14) is for that reason reduced during the connection phase.