Marc R Engelhardt

US Patent:

53927540, Feb 28, 1995

Filed:

Dec 16, 1993

Appl. No.:

8/167293

Inventors:

Daniel H. Hopper - Peru IN
Mark A. Laubenstein - Windfall IN
Marc R. Engelhardt - Kokomo IN

Assignee:

Delco Electronics Corp. - Kokomo IN

International Classification:

F02P 900

US Classification:

123609

Abstract:

An inductive ignition circuit, comprising a secondary winding across a spark plug and a primary winding in series with a lossy transistor switch and a power source, is subject to ringing at the start of the dwell period which can cause premature combustion. Ringing is suppressed by a short switch turn on pulse followed by a short delay prior to the main dwell period, causing a beginning build up of primary current and circuit energy followed by absorption of energy in the switch during switching to dissipate circuit energy needed for oscillation. Preferably, the short pulse is terminated when all the ringing energy is stored in the leakage inductance of the ignition coil.

US Patent:

20230062191, Mar 2, 2023

Filed:

Aug 30, 2021

Appl. No.:

17/461162

Inventors:

- St. Michael, BB
Marc R. ENGELHARDT - Kokomo IN, US
Mark R. KEYSE - Sharpsville IN, US

International Classification:

G01D 5/20

Abstract:

A method for fail-safe resolver excitation includes generating a resolver excitation signal and providing the resolver excitation signal to an input of a first resolver control circuit and to an input of a second resolver control circuit. The method also includes, in response to the first resolver control circuit detecting a fault in the resolver excitation signal provided to the first resolver control circuit: biasing, using the first resolver control circuit, a first resolver amplifier; and communicating, via a communication bus between the first resolver control circuit and the second resolver control circuit, an indication to the second resolver control circuit that the first resolver control circuit detected the fault in the resolver excitation signal provided to the first resolver control circuit.

US Patent:

20210108585, Apr 15, 2021

Filed:

Oct 11, 2019

Appl. No.:

16/599621

Inventors:

- St. Michael, BB
JERRY W. CAMPBELL - CARMEL IN, US
EUGENE V. RIPLEY - RUSSIAVILLE IN, US
MARC R. ENGELHARDT - KOKOMO IN, US
JINGYI HOU - WESTFIELD IN, US

International Classification:

F02D 41/14
G01R 27/02
F01N 11/00

Abstract:

A method of operating an oxygen sensor system is provided where the system includes an oxygen sensor, the oxygen sensor including a pump cell, and wherein the oxygen sensor is connected to associated circuitry such that the associated circuitry controls operation of the pump cell. The pump cell includes a pump line connected to a pump electrode of the pump cell and a return line connected to a return electrode of the pump cell. The method includes, subsequent to a diagnostic process, raising the potential of the pump line for a predetermined period of time by injecting current onto the pump line.

US Patent:

20210109057, Apr 15, 2021

Filed:

Oct 11, 2019

Appl. No.:

16/599663

Inventors:

- ST. MICHAEL, BB
JERRY W. CAMPBELL - CARMEL IN, US
EUGENE V. RIPLEY - RUSSIAVILLE IN, US
MARC R. ENGELHARDT - KOKOMO IN, US
JINGYI HOU - WESTFIELD IN, US

International Classification:

G01N 27/41
G01N 27/406

Abstract:

An oxygen sensor is in a system including compensator circuitry connected to the oxygen sensor. The oxygen sensor includes a pump cell and the compensator circuitry includes a feedback control loop which includes a digital compensator which determines and outputs a compensation current to the pump cell or adjusts a pump cell voltage. A method of controlling the oxygen sensor includes, subsequent to a period of time when the feedback control loop is disrupted, pumping a balancing current into or out the pump cell for a balancing time interval, the balancing current and/or the balancing time interval is dependent on a current pumped into or out of the pump cell prior to the feedback control loop being disrupted.