Chris E Hand

US Patent:

8616181, Dec 31, 2013

Filed:

Jan 11, 2011

Appl. No.:

13/004839

Inventors:

Farzad Sahandiesfanjani - San Jose CA, US
Chris Hand - Newport Beach CA, US
Mohammad Pirjaberi - San Jose CA, US
Adya S. Tripathi - San Jose CA, US

Assignee:

Tula Technology, Inc. - San Jose CA

International Classification:

F02D 28/00
F02D 17/02
F02D 41/00
G06F 19/00

US Classification:

123350

Abstract:

A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. In some aspects, methods and arrangements are described for operating an engine in a throttled skip fire mode. In other aspects, methods and arrangements are described for controlling the operational state of a variable displacement engine.

US Patent:

20110030657, Feb 10, 2011

Filed:

Jul 9, 2010

Appl. No.:

12/833916

Inventors:

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.

Author:

Chris Hand

ISBN #:

0864923775