WILLIAM DAVID PETERSON, DDS
Dentist at Court St, Flint, MI

4193380, 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.

4212065, 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.

4214307, 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.

4241710, 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.