US Patent No. 9,175,613

SYSTEM AND METHOD FOR SAFE VALVE ACTIVATION IN A DYNAMIC SKIP FIRING ENGINE


Patent No. 9,175,613
Issue Date November 03, 2015
Title System And Method For Safe Valve Activation In A Dynamic Skip Firing Engine
Inventorship John W. Parsels, San Jose, CA (US)
Matthew A. Younkins, San Jose, CA (US)
Shikui Kevin Chen, San Jose, CA (US)
Assignee Tula Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 9,175,613

1. A method of controlling the operation of an internal combustion engine having at least one cylinder, each cylinder having
an associated intake valve and an associated exhaust valve, the method comprising:
directing skip fire operation of the engine;
determining whether an exhaust valve actuation failure has occurred in which the exhaust valve associated with a selected
cylinder fails to open properly during a selected working cycle during the skip fire operation of the engine; and

when it is determined that an exhaust valve actuation failure has occurred, deactivating the intake valve associated with
the selected cylinder during a subsequent working cycle in which the intake valve would otherwise have been actuated in response
to the detection of the exhaust valve actuation failure.