Method for determining a value representative of the pressure in a combustion chamber of an internal combustion engine

• US 8,342,011 B2
• Filed: 11/18/2008
• Issued: 01/01/2013
• Est. Priority Date: 11/22/2007
• Status: Expired due to Fees

• Current Assignee: Continental Automotive France (Continental AG)
• Original Assignee: Continental Automotive France (Continental AG)
• Inventors: Galtier, Frédéric, Rouphael, Roger, Van-Est, Jeroen
• Primary Examiner(s): MCCALL, ERIC SCOTT
• Application Number:
  US12/742,734
• Publication Number:
  US 20100313640A1
• Time in Patent Office: 1,505 Days
• Field of Search: 731/140.7, 731/141.6, 731/141.7, 731/142.2
• US Class Current: 73/114.16
• CPC Class Codes: F02D 2200/025 Engine noise, e.g. determined by using an acoustic sensor
• CPC Class Codes: F02D 35/024 using an estimation
• CPC Class Codes: F02D 35/027 using knock sensors
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine

Abstract

A method for determining a value representative of the pressure in a combustion chamber of an internal combustion engine, includes the following steps:

• i. measuring the vibration level (2) of the internal combustion engine with an accelerometer placed on the engine block of the internal combustion engine,
• ii. integrating a value from the signal (2) provided by the accelerometer in a window (t1, t2) delimited as a function of the position of the crankshaft of the internal combustion engine,
• iii. supplying the result of the integration (A1) as a value representative of the pressure,
  characterized in that the signal (2) provided by the accelerometer in step “i” is integrated while being raised to a power greater than 1 by a predetermined exponent.

Claims

1. A method for determining a value representative of the pressure in a combustion chamber of an internal combustion engine, comprising the following steps:

i. measuring the vibration level (2) of the internal combustion engine by means of an accelerometer placed on the engine block of the internal combustion engine,

ii. integrating a value from the signal (2) provided by the accelerometer in a window (t1, t2) delimited as a function of the position of the crankshaft of the internal combustion engine,

iii. supplying the result of the integration (A1) as a value representative of the pressure,

characterized in that the signal (2) provided by the accelerometer in step “

i”

is integrated while being raised to a power greater than 1 by a predetermined exponent.

2. The method as claimed in claim 1, wherein the exponent is between 1.8 and 1.85.

3. The method as claimed in claim 2, wherein the exponent is equal to 1.81.