Internal cylinder pressure detection
AssigneeHonda Motor Co., Ltd.
InventorsKatsura Okubo, Yuji Yasui, Masahiro Sato, Koichiro Shinozaki
Life of this patent
Estimating the term…
Abstract
An in-cylinder pressure sensor outputs a signal corresponding to a change rate of an internal cylinder pressure of an engine. The output signal of the in-cylinder pressure sensor is filtered so that frequency components lower than frequencies that substantially compose an internal cylinder pressure required for controlling the engine are cut. The filtered output signal is integrated to determine the internal cylinder pressure. Thus, an internal cylinder pressure having no drift can be determined.
Claims20
An apparatus for detecting an internal cylinder pressure of an engine, comprising:
- an in-cylinder pressure sensor for outputting a signal corresponding to a change rate of an internal cylinder pressure of an engine;
- a filter for filtering the output signal from the in-cylinder pressure sensor, the filter cutting frequency components lower than frequencies that substantially compose an internal cylinder pressure required for controlling the engine;
- and
- an integrator for integrating the filtered signal to determine the internal cylinder pressure.
A method for detecting an internal cylinder pressure of an engine, comprising:
- acquiring an output signal of an in-cylinder pressure sensor of an engine, the output signal indicating a change rate of the internal cylinder pressure;
- filtering the output signal, the filtering includes cutting frequency components lower than frequencies that substantially compose an internal cylinder pressure required for controlling the engine;
- and
- integrating the filtered signal to determine the internal cylinder pressure.
Dependencies are inferred from the claim text.