Abstract: A shifter incorporates a shape memory alloy wire (SMA actuator) to control movement of a blocker to selectively prevent moving a shift lever (or pawl) out of its park position until predetermined vehicle conditions are met. A mechanical fuse (i.e., flexible overload spring) prevents damage to the SMA actuator where the shift lever (or pawl) can be frictionally stopped from movement despite the contraction of the SMA actuator. The control circuit for the SMA actuator includes a photo-electric switch for stopping electrical power to the SMA actuator when the shift lever is moved from its park position, and the shift lever includes structure for mechanically continuing to hold the switch open while out of park. Further, the control circuit is operably connected to an ignition key retaining mechanism so that the ignition key cannot be removed when the lever is not in its park position.

Abstract: A shifter includes an actuator incorporating a shape memory alloy wire to control movement of lever-position-controlling components of a vehicle transmission shift lever. In one arrangement, the actuator controls movement of a cam to prevent moving a pawl out of park position until predetermined vehicle conditions are met. Alternatively, the actuator can be directly attached to the pawl itself for controlling movement of the pawl, or connected to a toggle linkage arrangement for controlling movement of the pawl. In still another arrangement, a magnet arrangement is used to motivate a pawl-blocking member. When necessary, a mechanical fuse is operably connected to the system to prevent damage to the shape memory alloy wire where there is risk of the pawl being frictionally stopped from movement despite the contraction of the shape memory alloy wire actuator.

Abstract: A shifter includes an actuator, such as a shape memory alloy wire, to control movement of a set of strategically placed magnets on lever-position-controlling components of a vehicle transmission shift lever. In one arrangement, the actuator controls movement of a carrier carrying one or more of the magnets, the magnets controlling a position of a blocking member to prevent moving a pawl out of park position until predetermined vehicle conditions are met. Alternatively, the magnets can be carried by a cam, or slide, or wheel.

Abstract: A shifter incorporates a shape memory alloy wire (SMA actuator) to control movement of a blocker to selectively prevent moving a shift lever (or pawl) out of its park position until predetermined vehicle conditions are met. A mechanical fuse (i.e., flexible overload spring) prevents damage to the SMA actuator where the shift lever (or pawl) can be frictionally stopped from movement despite the contraction of the SMA actuator. The control circuit for the SMA actuator includes a photo-electric switch for stopping electrical power to the SMA actuator when the shift lever is moved from its park position, and the shift lever includes structure for mechanically continuing to hold the switch open while out of park. Further, the control circuit is operably connected to an ignition key retaining mechanism so that the ignition key cannot be removed when the lever is not in its park position.

Abstract: A control system includes a temperature sensor, an occupant detector, and a responsive circuit for activating a warning horn or to provide ventilation when an occupant is sensed in a dangerously hot passenger compartment. The circuit is passively actuated, such as by using a switch system incorporating a shape memory alloy (SMA) wire or a bimetal switch, in order to control temperatures in the passenger compartment or trunk of vehicles, such as when the vehicle is parked in the sun. The thermal switch actuates an occupant sensor using remote accessory power from the vehicle's battery, yet without creating an unacceptable phantom current drain on the vehicle's battery. Shape memory alloy wire contracts when temperature reaches a predetermined intolerable temperature in a vehicle, thereby closing a normally open switch contact to complete an electrical circuit.

Abstract: A shifter includes an actuator, such as a shape memory alloy wire, to control movement of a set of strategically placed magnets on lever-position-controlling components of a vehicle transmission shift lever. In one arrangement, the actuator controls movement of a carrier carrying one or more of the magnets, the magnets controlling a position of a blocking member to prevent moving a pawl out of park position until predetermined vehicle conditions are met. Alternatively, the magnets can be carried by a cam, or slide, or wheel.

Abstract: A solenoid having a housing and a coil disposed in the housing for generating a magnetic field when an electric current passes through the coil. A center pole is disposed within the coil, and the center pole is made of a ferromagnetic material. A rod assembly is movably disposed in the housing for movement between a rest position and an energized position. The rod assembly has a portion thereof disposed in the center pole, and includes a magnet having a polarity causing the magnet to be repelled from the center pole when an electric current passes through the coil. The magnet is encapsulated by an elastomeric material that contacts a stop surface when in the rest position to reduce noise resulting from shifting of the rod assembly from the energized position to the rest position.

Abstract: A shifter includes a powered pawl mechanism that selectively engages a shift gate. The powered pawl mechanism may include an electrically operated solenoid or the like, and may be mounted to the base of the shifter or to the shift lever. The pawl engages a shift gate that is mounted on the other of the shift lever and the base. A mechanical override may be utilized to disengage the pawl. The shifter includes an electrically operated push button or the like on the shift knob, and may utilize sensors that determine the shift lever position for controlling a transmission.

Abstract: A solenoid having a housing and a coil disposed in the housing for generating a magnetic field when an electric current passes through the coil. A center pole is disposed within the coil, and the center pole is made of a ferromagnetic material. A rod assembly is movably disposed in the housing for movement between a rest position and an energized position. The rod assembly has a portion thereof disposed in the center pole, and includes a magnet having a polarity causing the magnet to be repelled from the center pole when an electric current passes through the coil. The magnet is encapsulated by an elastomeric material that contacts a stop surface when in the rest position to reduce noise resulting from shifting of the rod assembly from the energized position to the rest position.