Title:
EXHAUST GAS REFLUX RATE ESTIMATING DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3268143
Kind Code:
B2
Abstract:
PURPOSE: To enhance eastimating accuracy of an exhaust gas reflux rate, and correct a fuel injection quantity or the ignition timing with high accuracy by finding wasteful time until exhaust gas flows in a combustion chamber by passing through an exhaust gas reflux valve, and calculating an exhaust gas reflux rate from an operating condition and a valve actuating condition.
CONSTITUTION: When an engine is operated, an ECU 5 searches a lift command value and a basic exhaust gas reflux rate correction factor by respective separate maps from engine rotating speed NE and intake air pressure PBA. Next, an exhaust gas reflux valve 19 is closed, and when the lift command value is not a lower limit value or less, the pressure ratio of the intake air pressure PBA to atmospheric pressure PA is found, and an EGR gas quantity A is found from its pressure ratio and the lift command value. An EGR gas quantity B is found from actual lift and the pressure ratio, and a reflux rate is estimated from an expression of (a reflux rate = a steady time reflux rate × B/A) with every operation period. A fuel injection correction factor is determined by selecting a past estimate corresponding to wasteful time until exhaust gas enters a combustion chamber by passing through the exhaust gas reflux valve 19.
Inventors:
Shusuke Akasaki
Hiroshi Kitagawa
Toru Kitamura
Yuusuke Hasegawa
Hiroshi Kitagawa
Toru Kitamura
Yuusuke Hasegawa
Application Number:
JP29401494A
Publication Date:
March 25, 2002
Filing Date:
November 02, 1994
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F02D41/02; F02D41/04; F02M25/07; F02P5/15; (IPC1-7): F02M25/07; F02D41/02; F02D41/04; F02P5/15
Domestic Patent References:
| JP5118246A | ||||
| JP6101575A | ||||
| JP5974364A | ||||
| JP6181555A |
Attorney, Agent or Firm:
Yutaka Yoshida