Adya S. TRIPATHI - San Jose CA, US Chester J. SILVESTRI - Los Gatos CA, US Christopher W. Chandler - Campbell CA, US Chris Hand - San Jose CA, US Joshua P. Switkes - Menlo Park CA, US Mark Wilcutts - Berkeley CA, US
Assignee:
TULA TECHNOLOGY, INC. - Santa Clara CA
International Classification:
F02D 17/02
US Classification:
123481
Abstract:
A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In the variable displacement mode, selected combustion events are skipped so that other working cycles can operate at better thermodynamic efficiency. More specifically, selected “skipped” working cycles are not fired while other “active” working cycles are fired. Typically, fuel is not delivered to the working chambers during skipped working cycles. In one aspect of the invention, a firing pattern is determined that is not fixed but the active working cycles are selected to favor the firing of working chambers that have recently been fired at least in part to reduce wall wetting losses. In another aspect of the invention, when an active working cycle follows a skipped working cycle in the same working chamber, the quanta of fuel injected for delivery to the working chamber is increased relative to the quanta of fuel that would be delivered to the working chamber when the active working cycle follows another active working cycle in the same working chamber in order to compensate for wall wetting losses that occur during skipped working cycles.
Chester J. SILVESTRI - Los Gatos CA, US Christopher W. CHANDLER - Campbell CA, US Christopher C. HAND - San Jose CA, US Joshua P. SWITKES - Menlo Park CA, US Mark A. WILCUTTS - Berkeley CA, US
International Classification:
F02D 17/02
US Classification:
12340612
Abstract:
A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In one aspect, the spark timing associated with each fired working cycle is based at least in part on the firing history of the fired working chamber.
Electric Machine Torque Adjustment Based On Waveform Integer Multiples
Methods, systems, and devices for electric machine torque adjustment based on waveform integer multiples are disclosed herein. One electric machine controller arranged to direct pulsed operation of an electric machine includes utilizing a pulse controller that calculates an average torque based upon a time period that corresponds with an integer multiple of a waveform cycle of a pulse waveform.
Noise, Vibration And Harshness Reduction In A Skip Fire Engine Control System
- San Jose CA, US Xin YUAN - Palo Alto CA, US John W. PARSELS - San Jose CA, US Mohammad R. PIRJABERI - San Jose CA, US Mark A. WILCUTTS - Berkeley CA, US Masaki NAGASHIMA - Pacific Grove CA, US
International Classification:
F02D 41/00 F02D 41/14 F02D 41/30 B60W 30/20
Abstract:
A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.
Lean Burn Internal Combustion Engine Exhaust Gas Temperature Control
A variety of methods and arrangements for controlling the exhaust gas temperature of a lean burn, skip fire controlled internal combustion engine are described. In one aspect, an engine controller includes an aftertreatment system monitor and a firing timing determination unit. The aftertreatment monitor obtains data relating to a temperature of one or more aftertreatment elements, such as a catalytic converter. Based at least partly on this data, the firing timing determination unit generates a firing sequence for operating the engine in a skip fire manner such that the temperature of the aftertreatment element is controlled within its effective operating range.
Noise, Vibration And Harshness Reduction In A Skip Fire Engine Control System
- San Jose CA, US Xin YUAN - Palo Alto CA, US John W. PARSELS - San Jose CA, US Mohammad R. PIRJABERI - San Jose CA, US Mark A. WILCUTTS - Berkeley CA, US Masaki NAGASHIMA - Pacific Grove CA, US
International Classification:
F02D 41/00 F02D 41/14 F02D 41/30 B60W 30/20
Abstract:
A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.
- San Jose CA, US Xin Yuan - Palo Alto CA, US Siamak Hashemi - Farmington Hills MI, US Vijay Srinivasan - Farmington Hills MI, US Srihari Kalluri - Ann Arbor MI, US Andrew W. Phillips - Rochester MI, US Mark A. Wilcutts - Berkeley CA, US Louis J. Serrano - Los Gatos CA, US Shikui Kevin Chen - San Jose CA, US
Controllers and methods for managing transitions into and/or out of a cylinder cut off mode are described. In some embodiments, a skip fire based transition into a cylinder cut off mode is used in which the fraction of working cycles that are fired is gradually reduced to a threshold firing fraction. Once the threshold firing fraction has been reached, all of the working chambers are deactivated.
- San Jose CA, US - Columbus IN, US Mark A. WILCUTTS - Berkeley CA, US Vijay SRINIVASAN - Farmington Hills MI, US
International Classification:
F02D 41/00 F02D 17/02 F02D 41/24
Abstract:
An internal combustion engine operates so that it delivers zero or negative torque. The engine operates in either a deceleration cylinder cut off (DCCO) mode or skip cylinder compression braking mode. In the skip cylinder compression braking mode, selected working cycles of selected working chambers are operated in a compression release braking mode. Accordingly, individual working chambers are sometimes not fired and sometimes operated in the compression release braking mode while the engine is operating in the skip cylinder compression braking mode.
Resumes
Principal Engineer, Engineering Manager, Control Systems
Tula Technology Inc.
Principal Engineer, Engineering Manager, Control Systems
Greenvolts Oct 1, 2007 - Jan 1, 2009
Lead Control Systems Engineer
Siemens Aug 1, 2006 - May 1, 2007
Technical Evaluation Consultant
Toyota Jan 1, 2006 - Feb 1, 2007
Research Engineer
Uc Berkeley 2000 - 2004
Researcher and Project Manager
Education:
University of California, Berkeley
Doctorates, Doctor of Philosophy
University of Illinois at Urbana - Champaign
Master of Science, Masters, Bachelors, Bachelor of Science
Skills:
Embedded Systems Control Systems Design Simulink Powertrain R&D Mechanical Engineering Matlab Mechatronics Sensors Engineering Management Electronics Project Management Control Theory Internal Combustion Engines Systems Engineering Data Acquisition Combustion Electro Mechanical Software Verification Technical Execution Engine Management Systems Simulation Software Cross Functional Team Leadership Rapid Prototyping Thermodynamics Electrical Engineering On Board Diagnostics Fault Management Uncertainty Analysis Gt Power Vibration Control Optimal Control Photovoltaics Fuel Economy Emissions Control Functional Verification Hil Technical Analysis Patent Strategy Start Up Ventures Realtime Programming Acoustics Hydraulic Systems Dynamometers Technical Writing Fluid Dynamics Mathematical Modeling Model Based Design Nonlinear Control Design Vehicle Dynamics
Interests:
Petroleum Free Transportation Sustainable Energy Production
Languages:
English German French
Certifications:
California Eit
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