Abstract: A wake up detector system is provided having a device with a sleep mode of operation to conserve energy and an awake mode operation, and an input digital data stream having a frequency. The system includes an analog filter for removing noise, and for passing the input digital data stream such that the passed input digital data stream includes a transient response consisting of an oscillating signal of increasing peak-to-peak amplitude. The system further includes a switch for comparing the transient response of the passed input digital data stream with a threshold voltage, and for switching the device from the sleep mode of operation to the awake mode of operation when the transient response of the passed input digital data stream reaches the threshold voltage.

Abstract: A remote keyless entry apparatus is disclosed for use with a vehicle. The apparatus includes a receiving unit disposed within the vehicle and a key fob transmitter for transmitting a plurality of signals to the receiving unit. The transmitter includes a transmitting unit for transmitting the plurality of signals to the receiving unit, a control unit operatively connected to the transmitting unit for controlling transmission of the plurality of signals and a diagnostic gathering and storage unit electrically connected to the control unit for supplying diagnostic data to the control unit. Additionally, the transmitter includes a key fob unit selectively connected to the control unit and to the diagnostic unit. The arrangement is such that in a first operative disposition of the key fob unit, the key fob triggers the control unit so that a first signal of the plurality of signals is generated by the transmitter unit for reception by the receiving unit.

Abstract: A current measuring apparatus measures current flowing through a phase winding of a switched reluctance motor while dissipating very little power. The apparatus includes a control for controlling the current flowing through the winding. A gate is operatively connected to the control for switching the current flowing through the winding. The arrangement is such that in a first mode of the gate, the current flows through the phase winding. In a second mode of the gate, flow of the current through the winding is inhibited. The gate includes a sense means for sensing a fraction of the current when the gate is in the first mode thereof. A resistor of relatively high resistance is electrically connected in series with the sense means such that a voltage drop occurs across the resistor when the gate is in the first mode. The voltage drop signal is fed back to the control so that dependent on the signal, the current flowing through the phase winding of the motor is maintained in order to maximize motor efficiency.