Leroy Shafer

US Patent:

40607143, Nov 29, 1977

Filed:

May 20, 1976

Appl. No.:

5/688217

Inventors:

John P. Lappington - Huntsville AL
Leroy Shafer - Toney AL

Assignee:

Chrysler Corporation - Highland Park MI

International Classification:

F02P 504
G06F 1520
G06G 770

US Classification:

364431

Abstract:

In one embodiment, a circuit parameter of a sensor varies in accordance with an input useful in controlling an event associated with operation of an engine, for example, spark timing. The sensor is connected in an input sensing circuit characterized by a first order differential equation exhibiting an exponential transient whose time constant is representative of the circuit parameter, and hence of the input being sensed. A step function input is applied to the sensing circuit to cause the occurrence of an exponential transient, and concurrently a digital counter circuit begins counting clock pulses. The transient is compared against a predetermined reference, and when a predetermined relationship between the reference and the transient is attained, the counter circuit ceases counting pulses. The accumulated count is in the form of a binary word which may be used directly by a digital microprocessor in calculations for controlling the event.

US Patent:

39358518, Feb 3, 1976

Filed:

Dec 26, 1973

Appl. No.:

5/428261

Inventors:

William Paul Wright - Huntsville AL
Leroy Shafer - Huntsville AL
John Ondocsin - Huntsville AL
Ivor W. Carter - Grosse Pointe Woods MI

Assignee:

Chrysler Corporation - Highland Park MI

International Classification:

F02M 3900
G05D 1100
F02C 904

US Classification:

123139E

Abstract:

A fuel metering system controlling the mass fuel-air ratio in a spark ignition engine in response to fuel and air volume measurements. Linear responsive transducers respond to various temperatures, pressures, throttle positioning, fuel flow, air flow and engine operation for correcting the volume flow measurements of both fuel and air to mass flow measurements. A positive displacement, dual action pump delivers fuel to the throttle body of the engine in response to the mass of the air entering into the throttle body.