Roman O Marchak

6456083, Sep 24, 2002

Mar 3, 2000

09/518615

Kirit A. Thakkar - Parma OH
Cheryl Greenly - Elyria OH
William Amato - Avon OH
Roman Marchak - Sheffield Lake OH

Bendix Commercial Vehicle Systems LLC - Elyria OH

G01R 3100

324500, 324 731, 3241581

A method and apparatus for diagnosing short circuit conditions in a circuit protects circuit components from being damaged during a diagnostic operation. The apparatus includes a control processor, a control circuit coupled to the control processor, and an A/D converter coupled to the control processor and the control circuit. In operation the control processor disables operation of an A/D converter after completion of a conversion operation, enables operation of the control circuit after operation of the A/D converter has been disabled, enables operation of the A/D converter to obtain an analog signal from the control circuit after operation of the control circuit has been enabled, and disables operation of the control circuit after enabling operation of the A/D converter to obtain the analog signal. The A/D converter converts the analog signal into a digital signal and the control processor analyzes the digital signal to determine if a short circuit condition exits in the control circuit. The control processor enables operation of the control circuit for a period that is less than an over current rating period of components of the control circuit, thereby insuring that the components of the control circuit will not be damaged if a short circuit condition exits.

42143071, Jul 22, 1980

Jun 22, 1978

5/918307

William A. Peterson - Rochester MI
Roman O. Marchak - Northville MI

The Bendix Corporation - Southfield MI

G06F 1546
F02M 700
F02M 5100

364431

An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating the air/fuel ratio that is corrected with a closed loop correction signal developed by an integral controller. The open loop calibration is a speed-density based schedule which is combined with corrections for special conditions to account for the operating parameters of the engine at any instant. Included in these special condition corrections are provisions for increasing the air/fuel ratio upon a deceleration sufficient enough to cause a rich air/fuel ratio breakthrough because of the EGR valve lag time. A deceleration detector senses decelerations in excess of this predetermined amount by measuring the rate of change of the pressure in the intake manifold of the engine. A fixed percentage increase in air/fuel ratio is switched into the open loop calibration when the deceleration exceeds the amount required for breakthrough.

42662753, May 5, 1981

Mar 28, 1979

6/024628

Roman O. Marchak - Northville MI

The Bendix Corporation - Southfield MI

F02B 300
F02M 706

364431

An acceleration enrichment feature for an electronic fuel injection system is disclosed. The enrichment feature includes an operating parameter enrichment circuit which provides an acceleration signal proportional to the rate of change of an engine operating parameter that is indicative of a desired acceleration. The acceleration signal is combined with an off-closed throttle enrichment signal and the combination is transmitted to a peak detect and decay circuit which produces a control voltage signal equivalent to the peak of the two signals. The control voltage signal from the peak detect and decay circuit is used to regulate a voltage controlled current sink generating an acceleration enrichment signal which varies the termination threshold of the main pulse generation. Additionally included is a warm-up multiplier circuit which varies the acceleration enrichment signal as a function of the engine coolant temperature.

42453178, Jan 13, 1981

Jun 22, 1978

5/917991

Roman O. Marchak - Northville MI

The Bendix Corporation - Southfield MI

G06F 1520
F02B 300
G05B 1302

364431

An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating air/fuel ratio that is corrected with a closed loop correction signal developed by an integral controller. The open loop calibration is a speed-density based schedule which is combined with corrections for special conditions to account for the operating parameters of the engine at any instant. Included in these special condition corrections are provision for start and warm-up features. The start feature includes an enrichment pulse generator whose pulses have a duration dependent upon the engine operating temperature and speed which are inhibited while the engine is above a predetermined RPM. The warm-up feature includes a time and temperature dependent enrichment which is linearly multiplied by an engine load factor. The warm-up feature further includes a time dependent holding level or delay from which the enrichment factor value decays during warm up and a feature to defeat this holding level above a certain engine operating temperature.

42417104, Dec 30, 1980

Jun 22, 1978

5/918180

William A. Peterson - Rochester MI
Roman O. Marchak - Northville MI

The Bendix Corporation - Southfield MI

F02M 700

123440

A closed loop system for the control of the air/fuel ratio of an internal combustion engine is disclosed. The system includes an open loop air/fuel ratio controller that has a closed loop correction applied to its basic pulse width control signal. The closed loop correction is based upon the bi-level switching of an oxygen sensor detecting a substantially stoichiometric condition in the exhaust gas of the internal combustion engine. Performing the correction is an integral controller which responds to the switching of the exhaust gas sensor to increase the air/fuel ratio for one level of the sensor and to decrease the air/fuel ratio for the other level. The limit cycle oscillation developed by the integral controller is modified by increasing the authority and gain rate of the controller as a function of the distance the system is away from a reference point so that it responds to transient conditions rapidly and smoothly. Another aspect of the invention provides for the authority modification to take place when the controller reaches a threshold and to employ minimum constant authority for quiescent conditions. Also, in response to a closed throttle or idle condition the quiescent authority level is reduced to a convenient idle level to prevent torque roll.

42120659, Jul 8, 1980

Jun 22, 1978

5/917992

Roman O. Marchak - Northville MI
William A. Peterson - Rochester MI
Ralph W. Carp - Newport News VA

The Bendix Corporation - Southfield MI

F02M 700
G06F 1546

364431

An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating the air/fuel ratio that is corrected with a closed loop correction signal developed by an integral controller. The open loop calibration is a speed-density based schedule which is combined with corrections for special conditions to account for the operating parameters of the engine at any instant. Included in these special condition corrections are provisions for an altitude compensation feature. The altitude compensation feature includes circuitry to modify the intake manifold pressure portion of the speed density schedule with two variables which depend on altitude. Power enrichment for the pressure schedule is provided as a function of altitude by lowering a power enrichment break point for increases in altitude and enrichment for all values of intake pressure is provided as a function of altitude to compensate for the internal EGR of the engine and to provide increased utilization for the closed loop controller.

42131804, Jul 15, 1980

Jun 22, 1978

5/918297

Roman O. Marchak - Northville MI
Douglas R. Verner - Orchard Lake MI

The Bendix Corporation - Southfield MI

G06F 1546
F02M 700

364431

An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating air/fuel ratio that is corrected with a closed loop signal developed by an integral controller. The integral controller bases the closed loop correction signal on a signal from an exhaust gas composition sensor located in the engine exhaust manifold. Various conditions of the system are sensed by a closed loop sensor condition detector to provide information on whether the sensor is up to operating temperature and is operative. If the exhaust gas sensor is functioning and the operating system parameters indicate the system operation should move to closed loop control, the loop is closed by the condition detector. Included in the condition detector circuit is a timer whose cycle is RPM dependent. The timer will time out if the sensor has not indicated an operational capability in one timing cycle or a set number of RPM counts and will generate a signal indicating a sensor failure.

41933800, Mar 18, 1980

Jun 22, 1978

5/918309

Roman O. Marchak - Northville MI
William A. Peterson - Rochester MI

The Bendix Corporation - Southfield MI

F02B 302

123 32EG

An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit has an open loop calibration for regulating air/fuel ratio that is corrected with a closed loop correction signal developed by an integral controller. The open loop calibration is a speed-density based schedule which is combined with corrections for special conditions to account for the operating parameters of the engine at any instant. Included in these special condition corrections are provision for start and warm-up features. The start feature includes an enrichment pulse generator whose pulses have a duration dependent upon the engine operating temperature and speed which are inhibited while the engine is above a predetermined RPM. The warm-up feature includes a time and temperature dependent enrichment which is linearly multiplied by an engine load factor. The warm-up feature further includes a time dependent holding level or delay from which the enrichment factor value decays during warm up and a feature to defeat this holding level above a certain engine operating temperature.