Gm Global Technolgoy Operations, Inc.

Gerald O Huntzinger

Lewis R Hetzler

Raymond O Butler, Jr

Melvin H Hallmann

John Delaplane

Anthony L Marks

Yuchi P Peng

Robert E Campbell

Charles E Buck

Burr E Stephens

Kenneth H Clayton

Thomas A Zickel

William P Winstead, Iii

A plurality of electrical load switches of the type operable to at least two operating conditions by the actuation of an operating member are connected in respective motor vehicle load circuits and are mounted in a switching unit having an actuating mechanism for actuating the switch operating members that is selectively locatable in each of a plurality of switch operating positions in each of which it is in register with an operating member. The switching unit is controlled by a microprocessor that effects the locating of the actuating mechanism in the switch operating position in which it may actuate the operating member of a load switch selected to be operated and the operating of the actuating mechanism when so located in response to function select electrical signals that indicate the load switches selected for operation.

System for selectively controlling motor vehicle electrical loads

A vacuum actuator, suitable for use in an automatic belt tensioning system, oscillates automatically when connected to a source of constant vacuum.

Self oscillating vacuum actuator

A plurality of individual electrical load switches each having an operating tab are so mounted and oriented that the operating tabs extend toward a central axis to define a circle substantially normal to the central axis and operate substantially in the direction of the central axis. An operating arm having ends thereof arranged to be brought into register with each operating tab at mutually exclusive angular positions is normally tilt mounted in a first direction upon a rotor that may be positioned in selected ones of a plurality of angular positions by a step motor. Upon one end of the arm being brought into register with a switch operating tab, the arm is tilted in the opposite direction to effect the operation of the operating tab with which the one end thereof is in register to place the corresponding individual electrical load switch in a selected circuit condition.

Remote control unit

A broadly tuned self resonant knock sensor includes a piezoelectric element mounted on a central mounting stud. The element includes a generally annular vibratable portion having a variable radial dimension so as to exhibit resonant vibrations at a plurality of relatively closely spaced resonant frequencies essentially spanning an engine determined knock frequency band. In its preferred embodiment the element comprises a circular plate having piezoelectric generating means and an axis offset from the axis of the mounting stud.

Piezoelectric knock sensor

A detonation sensor adapted for mounting on a vehicle engine component has a cylindrical outer case with an open end. An inner cylindrical case has an open end facing in the opposite direction as that of the outer case and is so disposed coaxially within the outer case that it is held slightly axially separated therefrom by at least one rod of a magnetostrictive material and a magnet axially in line therewith. The edges of the open end of the outer case are crimped over a washer which abuts the closed end of the inner case to exert an axial stress on the magnetostrictive rod. Axial mounting means are provided on the outer case; and a pickup coil surrounds the magnetostrictive rod within the inner case. Both inner and outer cases are formed from a magnetic material to shield the coil from external electromagnetic signals.

Engine detonation sensor with double shielded case

A read only memory is pre-programmed to produce an output binary signal representation of a predetermined ignition spark timing angle based upon the instantaneous value of both of two selected engine operating parameters at each of a plurality of respective selected points within the range of values in response to respective input address signals. Over the range of values of the two selected engine operating parameters, therefore, the read only memory generates a three-dimensional surface of ignition spark timing angles. The binary signal representations of the ignition spark timing angles retrieved from the read only memory are varied in accordance with engine manifold vacuum and actual atmospheric pressure to tilt the three-dimensional surface generated by the read only memory about a selected engine parameter value as an axis in an amount substantially inversely proportional to actual atmospheric pressure.

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Anderson, IN, United States of America

Gerald O Huntzinger