Other

Motorola Corporation

Richard G Sawyer

John R Cooper

Scott W Repplinger

A fuel injector control circuit and method include first switching circuitry (128, 134, 138, 142, 148, 152, 154) to selectively apply a first electrical signal (171) to a solenoid (114) to vary a load signal (176) between a first maximum (201) threshold and a first minimum (203) threshold. Second switching circuitry (130, 132, 136, 140, 148, 154) to selectively applies a second electrical signal (198) to the load (114) to vary the load signal (176) between a second maximum (205) threshold and a second minimum (207) threshold. The second electrical signal (198) has a magnitude substantially higher than the first electrical signal. Preferably, the second maximum threshold (205) has a magnitude less than a magnitude of the first maximum threshold (201), and greater than a magnitude of the first minimum threshold (203), and the second minimum threshold (207) has a magnitude less than the magnitude of the first minimum threshold (203).

Fuel injector control circuit and system with boost and battery

Display sign support having detachable component parts and slideable

A portable advertising sign is positioned in proximity to a street and includes a message board. A low power transmitter is physically secured to the sign and generates a modulated RF output signal at a predetermined frequency within the broadcast band. An antenna colocated with the sign is coupled to the transmitter and radiates the transmitter output signal. A cassette tape player is positioned in a secure area physically spaced apart from the sign by a substantial distance and includes a colocated power supply for supplying a DC voltage. A cable conveys the audio output signal from the tape player and the DC voltage from the power supply to the transmitter. The sign message board displays the operating frequency of the transmitter to vehicles passing by the sign.

Growing community of inventors

Tempe, AZ, United States of America

Richard G Sawyer