Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2003-04-16
2004-06-29
Lo, Weilun (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S090150, C123S674000, C073S118040, C701S103000
Reexamination Certificate
active
06755182
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
When operating unthrottled (e.g., without a throttle or at or near wide-open throttle) in an electric valve actuation type engine (or a continuously variable valve lift engine), a mass air flow sensor is degraded due to reverse flow effects leading to erroneous measurement. A manifold pressure sensor (MAP) also cannot be the primary sensor for measuring airflow (e.g., using a speed density approach), as the manifold pressure is substantially near atmospheric pressure during a wide variety of engine conditions. Further, even sensors that provide directional compensation may not be functional at low loads for these engines.
The inventors herein have recognized one approach to overcome these disadvantages. In particular, that is to estimate air flow using engine speed, temperature, and valve timing (additional compensation from an estimate, or measurement, of atmospheric pressure if desired (e.g., from a MAP during engine starting)). But, as the engine ages, this estimate can become degraded. In other words, the engine air-to-fuel ratio control performance can be significantly degraded due to aging and part-to-part variability.
As such, the inventors herein have developed a system to compensate for such effects. The system comprises: an engine with electronically adjustable engine valve timing or valve lift; a sensor coupled to said engine; and a controller for: determining whether a condition is present; when said condition is present, operating in a first mode where an engine air amount is determined based on a valve amount and an adaptive parameter, wherein during said first mode said controller further updates said adaptive parameter based on said sensor; and operating-in a second mode where said engine air amount is determine based on said valve amount and said adaptive parameter.
In this way, it is possible to utilize the adaptive information across multiple engine operating modes, and even in modes where adaptation is not possible or where adaptation is limited.
REFERENCES:
patent: 4644474 (1987-02-01), Aposchanski et al.
patent: 5597951 (1997-01-01), Yoshizaki et al.
patent: 5654501 (1997-08-01), Grizzle et al.
patent: 6189512 (2001-02-01), Kawasaki et al.
patent: 6282485 (2001-08-01), Kotwicki et al.
patent: 6308683 (2001-10-01), Pursifull et al.
patent: 6328007 (2001-12-01), Hirasawa et al.
patent: 6412458 (2002-07-01), Kawasaki et al.
patent: 6571613 (2003-06-01), Schenk et al.
patent: 6671613 (2003-12-01), Stotsky et al.
patent: 6691022 (2004-02-01), Takemura et al.
“On the Value of Information in System Identification—Bounded Noise Case”, Fogel et al., Automatica, vol. 18, No. 2, pp. 229-238.
“Recursive State Bounding by Parallelotopes”, Chisci et al., 1996, Automatica, vol. 32, No. 7, pp. 1049-1054.
“Unifying the Landmark Developments in Optimal Bounding Ellipsoid Identification”, Deller et al., 1994, International Journal of Adaptive Control and Signal Processing, vol. 8, pp. 43-60.
Kolmanovsky Ilya V.
Michelini John Ottavio
Lippa Allan J.
Lo Weilun
LandOfFree
Adaptive control for engine with electronically adjustable... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive control for engine with electronically adjustable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive control for engine with electronically adjustable... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3349904