Method and system for estimating in-cylinder pressure and knocking utilizing an in-cylinder pressure sensor
First Claim
1. A system for estimating in-cylinder parameters in an engine cylinder, comprising;
- an in-cylinder pressure sensor associated with an engine cylinder for sensing an ionization charge inside said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure;
a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal; and
a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as control logic in order to control said engine cylinder performance.
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Accused Products
Abstract
A system for measuring in-cylinder parameters utilizing an image charge measured in an engine cylinder by an in-cylinder pressure sensor due to chemi and or thermal ionization in Engine. The in-cylinder pressure sensor includes a sensing element, which is a metal sensor probe with a selective coating (e.g., metal, oxides of metal, native oxides, semiconductor, oxides of semiconductors, ceramics, glass, dielectric, etc., in the form of a coating on the metallic probe, tube, etc) in order to function in harsh, corrosive and/or elevated temperature environments. The output of the sensor can be connected to a signal-conditioning unit, which includes a low noise differential charge amplifier with an auto offset correction circuit to measure fast varying signals. The signal out from the conditioning unit can be acquired utilizing a high-speed microcontroller-based data acquisition system with suitable software to analyze and estimate parameters such as, for example, in cylinder pressure and knocking.
29 Citations
20 Claims
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1. A system for estimating in-cylinder parameters in an engine cylinder, comprising;
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an in-cylinder pressure sensor associated with an engine cylinder for sensing an ionization charge inside said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure; a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal; and a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as control logic in order to control said engine cylinder performance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for estimating in-cylinder parameters in an engine cylinder, comprising;
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an in-cylinder pressure sensor associated with an engine cylinder for sensing an ionization charge inside said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure; a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal; a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as a control logic in order to control said engine cylinder performance; and a metallic sensor probe with a selective coating associated with said in-cylinder pressure sensor in order to function within a harsh, corrosive and elevated temperature environment. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for estimating in-cylinder parameters in an engine cylinder, comprising;
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associating an in-cylinder pressure sensor with an engine cylinder for sensing an ionization charge within said engine cylinder and outputting an image charge signal indicative of a change rate of said engine cylinder pressure; configuring a signal conditioning unit in communication with said in-cylinder pressure sensor including a pair of charge amplifier and a differential amplifier for detecting and amplifying said image charge signal; and providing a data acquisition component for estimating at least one in-cylinder parameter and creating a control signal in accordance with a program stored in a memory as control logic in order to control said engine cylinder performance. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification