摘要:
A free piston gas compressor comprising a cylinder, a piston reciprocable within the cylinder and a reciprocating linear electric motor derivably coupled to the piston having at least one excitation winding. A measure of the reciprocation time of the piston is obtained, any change in the reciprocation time is detected and the power input to said excitation winding is adjusted in response to any detected change in reciprocation time.
摘要:
A movable barrier operator (10) can have at least two automatic modes of operation. These modes of operation can differ from one another at least with respect to their respective utilized maximum-applied-force thresholds, such that one of the modes of operation correlates to a reduced maximum-applied-force threshold. Selection between these available maximum-applied-force thresholds can be based, at least in part, upon whether an obstacle detector is operably coupled to the movable barrier operator. In one embodiment, a primary controller (30) and a secondary controller (31) can be utilized to effect the controlled selection and usage of the available maximum-applied-force thresholds. In another embodiment, maximum permitted speed of travel for the movable barrier can also be determined, at least in part, as a function of whether an obstacle detector is available to the movable barrier operator.
摘要:
When an operation of lowering window glass is conducted to attain a full-opened state and a lock current flows, a lowering operation is invalidated, thereby preventing the lock current from continuously flowing. When a raising operation is conducted under the full-opened state, a power window motor is operated in a direction of closing the window glass, and the in validating state is canceled. In the case where, before the full-closed state is attained, a foreign object is caught and the lock current flows, the same as above is conducted. In a raising operation of closing the window glass, the raising operation under the full-closed state is invalidated, thereby preventing the lock current from continuously flowing. When a lowering operation is conducted under the full-closed state, the power window motor is operated in the direction of opening the window glass, and the invalidating state is canceled.
摘要:
A detector, that prevents erroneous detection of a foreign object caught in a window glass when the engine of a vehicle is being operated and when the engine is stopped using a relatively simple control method. The detector includes a pulse sensor for detecting rotational speed of a motor. A microcomputer calculates a cycle difference sum based on the rotational speed of the motor. The microcomputer compares the cycle difference sum with a obstruction determination threshold to determine whether a foreign object has been caught. The microcomputer detects whether the engine is stopped. When detecting that the engine is stopped, the microcomputer changes the obstruction determination threshold so that the probability of the microcomputer determining that a foreign object has been caught is lower than that when the engine is being operated.
摘要:
The invention relates to an actuating system of the type comprising an electric motor (1) controlled by a computer (2) as a function of a position setpoint of the member that is to be actuated, said system comprising an encoder (3) that is dependent on the movement of the motor (1), a sensor designed to deliver two square digital position signals (A, B) in quadrature which are representative of the position of the encoder (3), a device (5) for processing the signals (A, B), which device can determine the actual position of the encoder (3), and a device (6) for comparing the actual position of the encoder (3) with the position of the encoder (3) that corresponds in theory to the applied setpoint. The invention also relates to methods of actuating a member using such a system and to the use of such a system for actuating a device for metering fuel in a heat engine.
摘要:
A hill hold apparatus and operating strategy for an electric or hybrid electric vehicle is disclosed. The apparatus includes a three-phase machine that is coupled to drive wheels. The machine is powered by a pulse width modulated inverter having at least a first half-bridge coupled to a first machine phase, a second half-bridge coupled to a second machine phase, and a third half-bridge coupled to a third machine phase. The operating strategy employs predetermined switching modes to minimize and distribute the power loss among the power switches in the inverter and the machine phases.
摘要:
A system detects an obstruction in the path of a vehicle openable member, such as a window. The system comprises a direct detector of the obstruction and an indirect detector of the obstruction. The indirect detector detects force exerted by the obstruction on the openable member, while the direct detector uses an image of the opening to detect an obstruction. The indirect detector provides the direct detector with openable member position information, which is used in the direct detector to refine the detection process and increase its reliability. The indirect detector can also interrupt the movement of the openable member if the direct detector malfunctions.
摘要:
Temperature of the disk drive is measured using components of the disk drive without the need of including a separate temperature sensor to optimize performance of the spindle motor during startup. To measure temperature, the resistance of the VCM winding is measured and used to estimate the spindle bearing temperature. Back emf is measured from VCM windings and used during startup to accurately determine actuator position. Because the VCM coil resistance varies significantly with temperature, coil resistance variations with temperature are determined to enable compensation for inaccuracies in determination of actuator velocity. This inferred temperature is then used to optimize the start up procedure for the spindle motor to accommodate the increased frictional loading of the spindle bearing. In this way an improved performance in the reliability and spin up operation time can be realized without the addition of a separate temperature measurement hardware element.
摘要:
A control device for an opening/closing member which changes a predetermined judgment value from a first judgment value to a second judgment value greater than the first judgment value after the operation of an operation switch is repeated for a predetermined time if the control for stopping and reversing the movement of the opening/closing member is repeated when the operation switch is operated to close the opening/closing member again after performing the control for stopping and reversing the opening/closing member, and the second judgment value is returned to the first judgment value after elapsing a predetermined time after changing the predetermined judgment value to the second judgment value.
摘要:
An electrical system and apparatus for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. The operating parameters of the turbine are monitored during start-up and/or the power out mode.