Delco Electronics Corporation

Gm Global Technolgoy Operations, Inc.

Hughes Aircraft Company

Delphi Technologies, Inc.

James R Chintyan

Raymond Lippmann

Michael J Schnars

James Edward Nelson

Mark C Hansen

James M Aralis

Frank J Bohac, Jr

Anthony Luke Simon

Edward H Honnigford

William J Johnston

A system and a method for determining a velocity and a direction of travel of a vehicle on a roadway are provided. The method includes selecting a portion of the roadway and determining a cellular phone base station that is within a desired distance from the portion of the roadway, from a plurality of cellular phone base stations. The method further includes inducing a cellular phone base station to transmit a first message to a first global positioning system transceiver unit disposed in a first vehicle. The first message requests a first position coordinate from the first GPS transceiver unit. The method further includes receiving a second message from the first GPS transceiver unit having the first position coordinate and a first time value, and inducing the cellular phone base station to transmit a third message to the first GPS transceiver unit. The third message requests a second position coordinate of the first GPS transceiver unit. The method further includes receiving a fourth message from the first GPS transceiver unit having the second position coordinate and a second time value, and determining a velocity and a direction of travel of the first vehicle based on the first and second position coordinates and the first and second time values.

System and method for determining a velocity and a direction of travel of a vehicle on a roadway

Two or more communication modules are coupled by a one wire transmission line. A feed module impresses dc power and a sine wave carrier signal on the line. Each module generates a square wave signal synchronous with the carrier, each period of the signal representing one data bit. Data is written onto the line by a module by attenuating the carrier wave for selected bits and read by another module by sampling the bits and detecting those which are attenuated. Address and message data is transmitted in packets of n bits, the first bit always being an attenuated bit. Addressing is accomplished by generating a sequence of n unattenuated bits and then writing packets of address data. An address is valid when it matches a stored address in a module and that module is then activated to read or write. Multiple addressing modules can be used with a priority technique which reserves a priority code location at the beginning of an address string and compares code bits of a sending module with carrier bits, and aborts the address write when the carrier has an attenuated priority bit and the sending module is attempting to send an unattenuated bit.

Serial communication method and apparatus

An apparatus includes a rotatably mounted magnetic rotor, a first coil mounted in proximity of the magnetic rotor, the first coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. The apparatus includes a second coil mounted in proximity of the magnetic rotor, the second coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. A current source is coupled to the first coil, for generating an AC signal and applying the AC signal across the first coil whereby an AC output signal develops across the second coil, the AC output signal having a magnitude that varies in relation to the rotational position of the rotor. A measuring circuit detects the AC output signal and develops therefrom a measure of the position of the rotor.

Method and apparatus for determining the rotational position of a

An apparatus for fuel level display systems comprises a fuel level sender providing a fuel level signal, a short period filter for filtering the fuel level signal through a short time constant filter, a long period filter for filtering the fuel level signal through a long time constant filter, a signal selector for selecting the long period filter output if the fuel level is above a trip point and for selecting the short period filter if the fuel level is below the trip point, and a display device for displaying a level of fuel in the tank in response to the selected signal.

Fuel wobbler

An apparatus for processing data, such as liquid level data in a motor vehicle containing a liquid storage tank, comprises a liquid level sensor for developing a signal indicative of instantaneous liquid level in the storage tank, circuitry for processing the instantaneous liquid level signal, including asymmetrical filtration of the instantaneous liquid level signal, to provide a process output signal, and a display apparatus for displaying an indication of the level of liquid in the storage tank in response to the process output signal.

Slew rate limiter with asymmetrical operation

A circuit apparatus comprises interface circuitry between analog and digital circuitry. A multiple reference circuit provides a variety of reference voltage signals. The multiple reference circuitry is coupled to a selection circuit that selectively couples one of the reference voltage signals to a first reference input of the interface circuitry and selectively couples another of the reference voltage signals to a second reference input of the interface circuitry, whereby the first and second reference inputs may be selectively coupled to the reference voltages and the circuit maintains a ratiometric relationship between the digital and analog circuitry.

Maintaining ratiometric data in electronically manipulated signal

A circuit apparatus for providing increased apparent resolution in digital signal processing systems includes a comparison circuit receiving an N bit digital input signal and the N most significant bits of an N+M bit output signal. The comparison circuit compares the two signals and provides a control output in response to the comparison. An N+M bit counter increases or decreases a count value which is the output signal in response to the comparison, whereby the output signal has an apparent resolution 2.sup.M better than the resolution of the input signal.

Gauge glider

An apparatus for applying a curve transfer function to an input signal comprises a first set of memory for storing values representing boundary points or distance differences along a curve of the transfer function, a second set of memory for storing slope values of lines connecting adjacent boundary points along the curve, a counter unit for maintaining a position count indicating position along the curve of the transfer function with respect to the stored boundary point values, an addressing unit, responsive to the position count, for selecting, from the second set of memory memory, the slope value corresponding to the position count, an accumulator for adding the selected slope value to an accumulator output value; and a comparator and data latch for determining when the accumulator output value corresponds to the input signal, and for selecting the corresponding accumulator output value as an output signal representing the application of the curve transfer function to the input signal.

Electronic gauge transform

A circuit including a sender providing a sender output signal responsive to a vehicle parameter, circuitry for providing an adjustable reference, circuitry for comparing the output signal to the adjustable reference and providing a comparison output signal therefrom, an up/down counter for filtering the comparison output signal, and circuitry for providing an indicator control signal in response to the filtered output signal and for controlling the adjustment of the adjustable reference, provides a signal to a vehicle operator that is both filtered and has hysteresis to minimize repeated switching of the signal between two states.

Filter with hysteresis for trip point applications

A circuit disclosed maintains ratiometric analog inputs to an integrated circuit using a network of resistors, some of which are external to the integrated circuit and some of which are internal to the integrated circuit, reducing expense. The analog inputs maintain a fixed ratio during fluctuations in supply voltage and fluctuations in temperature.

Circuit with ratiometric analog inputs

An improved sender circuit which provides increased resolution measurements from a sensor by using two or more separately applied driving voltages. Only two connections to the sensor are required, the sensor having one or more switches closed in relation to the parameter being measured.

Increased resolution sensor circuit

To protect a load circuit on a printed circuit board, a pair of input circuit conductors are placed close together to form a spark gap. A load limiting resistor is placed in one of the conductors. A tape with adhesive around its perimeter is secured to the circuit board over the spark gap to trap air or other gas at the spark gap. A conformal coating covers the circuit board including the tape and the resistor.

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Davison, MI, United States of America

James R Chintyan