Method for determining atmospheric pressure during the operation, in a partial load state, of a turbocharged engine

Patent metadata

Field	Value
Publication number	US-10100756-B2
Application number	US-201515120857-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Feb 27, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A method for determining atmospheric pressure AMP during operation in a partial load state of a turbocharged engine ( 1 ) including an air intake line ( 2 ) incorporating a butterfly valve ( 16 ), and an exhaust line ( 3 ) including a bypass duct ( 20 ) incorporating an exhaust gas discharge valve ( 21 ), the method includes measuring the air pressure PUT upstream of the butterfly valve ( 16 ), and for a given speed of N rpm of the engine ( 1 ), when the boost pressure PUT corresponds substantially to the natural boost pressure, determining the atmospheric pressure AMP=AMP(0)+PUT−PUT(0), wherein AMP(0) is the atmospheric pressure previously measured, and PUT(0) is boost pressure naturally obtained for the speed N rpm of the engine ( 1 ) for the atmospheric pressure AMP(0).

First claim

The invention claimed is:

1. A method for determining atmospheric pressure (AMP) during operation, in a partial load state, of a turbocharged engine ( 1 ) equipped with an air intake line ( 2 ) containing an intake pipe (A) that incorporates a compressor ( 12 ) and a butterfly valve ( 16 ), and an exhaust line ( 3 ) that includes, in parallel, a main exhaust pipe (E) incorporating a turbine ( 19 ) and a bypass duct ( 20 ) incorporating an exhaust gas discharge valve ( 21 ), the method comprising:
in a state of a maximum opening of the discharge valve ( 21 ) and a partial opening of the butterfly valve ( 16 ), measuring, by way of a pressure sensor ( 25 ) provided in the intake pipe (A) upstream of the butterfly valve ( 16 ), a boost pressure (PUT) of air in the intake pipe (A) upstream of the butterfly valve ( 16 );
for a given speed (N) of the engine ( 1 ), when the boost pressure (PUT) corresponds substantially to a natural boost pressure, determining the atmospheric pressure (AMP) from the following equation:
AMP=AMP(0)+ PUT−PUT (0); and

using said determined atmospheric pressure (AMP) for operation of the engine,
wherein:
AMP(0) is a previously measured reference atmospheric pressure, and
PUT(0) is a boost pressure naturally obtained for the speed (N) of the engine ( 1 ) for the atmospheric pressure AMP(0).

2. The method as claimed in claim 1 , further comprising: measuring, by way of a second pressure sensor ( 26 ) located downstream of the butterfly valve ( 16 ), a manifold pressure (MAP) of air downstream of the butterfly valve ( 16 ), and wherein the atmospheric pressure (AMP) is determined when the a MAP/PUT ratio of the measured values of the manifold pressure (MAP) and boost pressure (PUT) is greater than 0.80.

3. The method as claimed in claim 1 , wherein, in a start-up phase of the engine ( 1 ), the boost pressure (PUT) is measured and a value of said measured boost pressure is allocated to the reference atmospheric pressure (AMP (0)).

4. The method as claimed in claim 2 , wherein, in a start-up phase of the engine ( 1 ), the boost pressure (PUT) is measured and a value of said measured boost pressure is allocated to the reference atmospheric pressure (AMP (0)).

Assignees

• Continental Automotive France
• Continental Automotive Gmbh

Inventors

• Cuvelier Laurent

Classifications

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• F02B37/225

  air passages · CPC title

• F02M35/1038

  for temperature or pressure · CPC title

• F02D41/0007 Primary

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02D2200/101

  Engine speed · CPC title