US Patent No. 9,702,787

IN-CYLINDER PRESSURE DETECTING APPARATUS FOR INTERNAL COMBUSTION ENGINE


Patent No. 9,702,787
Issue Date July 11, 2017
Title In-cylinder Pressure Detecting Apparatus For Internal Combustion Engine
Inventorship Shusuke Akazaki, Wako (JP)
Shunichi Saito, Tochigi (JP)
Assignee HONDA MOTOR CO., LTD., Tokyo (JP) KEIHIN CORPORATION, Tokyo (JP)

Claim of US Patent No. 9,702,787

1. An in-cylinder pressure detecting apparatus for an internal combustion engine, for detecting an in-cylinder pressure which
is a pressure in a combustion chamber of said engine, said in-cylinder pressure detecting apparatus comprising:
in-cylinder pressure detecting means for detecting the in-cylinder pressure and output the detected in-cylinder pressure;
motoring pressure estimating means for estimating a motoring pressure corresponding to an in-cylinder pressure when no combustion
is performed in said combustion chamber;

detected pressure peak value obtaining means for obtaining a peak value of the detected in-cylinder pressure as a detected
pressure peak value in a predetermined operating condition of said engine;

estimated motoring pressure peak value calculating means for calculating an estimated motoring pressure peak value which is
a peak value of the motoring pressure estimated by said motoring pressure estimating means, the estimated motoring pressure
peak value corresponding to the detected pressure peak value; and

sensitivity correcting means for comparing the detected pressure peak value with the estimated motoring pressure peak value,
and performing sensitivity correction of said in-cylinder pressure detecting means based on a result of the comparison,

wherein the predetermined operating condition is an operating condition in which an exhaust gas temperature raising control
is performed for raising a temperature of exhaust gases from said engine by increasing an intake air amount of said engine
and retarding an ignition timing of said engine.