Process for controlling a combustion engine

Details Process for controlling a combustion engine Process for controlling a combustion engine

2006-03-28

2006-03-28

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

C701S102000

Reexamination Certificate

active

07017549

ABSTRACT:
Proposed is a method for controlling an internal combustion engine (1) with a common-rail injection system and a high-pressure control loop. In this method, a pump with an intake throttle (3) is controlled by means of an electronic control device (4) using a PWM signal with a first frequency. The invention provides that a critical speed is calculated from the angular distance between injections and the first frequency of the PWM signal. A speed range is then determined as a function of the critical speed. For engine speed values that fall outside this speed range, the PWM signal is set to the first frequency. For engine speed values that fall within the speed range, the PWM signal is set to a second frequency. Switching the PWM signal reduces the pressure oscillations in the rail (6).

REFERENCES:
patent: 6055960 (2000-05-01), Marumoto et al.
patent: 6253733 (2001-07-01), Marumoto et al.
patent: 6390064 (2002-05-01), Marumoto et al.
patent: 6636783 (2003-10-01), Yasui et al.
patent: 6718254 (2004-04-01), Hashimoto et al.
patent: 4020654 (1992-01-01), None

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