Method for controlling an internal combustion engine for compensating bouncing oscillations

• US 6,035,827 A
• Filed: 12/07/1998
• Issued: 03/14/2000
• Est. Priority Date: 12/05/1997
• Status: Expired due to Term

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Przymusinski, Achim, Heinitz, Dirk
• Primary Examiner(s): Wolfe, Willis R.
• Assistant Examiner(s): Vo, Hieu T.
• Application Number:
  US09/207,122
• Time in Patent Office: 463 Days
• Field of Search: 123/436, 123/406.23, 123/406.24
• US Class Current: 123/436
• CPC Class Codes: B60W 2050/0052 Filtering, filters
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/14 Introducing closed-loop corrections
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine

Abstract

A transmission system includes an internal combustion engine, a vehicle drive train and a fuel supply. A method for controlling the internal combustion engine for preventing low frequency bouncing oscillations includes connecting a transmission element upstream of the transmission system. The transmission element has a transmission function inverse with respect to a transmission function of the transmission system. A selection of a time constant of the transmission element not only prevents the bouncing oscillations but also achieves a damping of load jolts.

Claims

1. In a method for controlling an internal combustion engine, the improvement which comprises:

providing a transmission system having a transmission function, a vehicle drive train and the internal combustion engine, the transmission system to be excited by changes in a fuel supply quantity to experience low frequency bouncing oscillations defined by the transmission function of the transmission system;

providing a transmission element for compensating the bouncing oscillations by correcting a fuel supply, the transmission element having a transmission function being inverse of the transmission function of the transmission system and being a fractional rational function in a frequency representation;

setting a numerator of the fractional rational function equal to a denominator of the transmission function of the transmission system;

damping the bouncing oscillations by selecting a time constant and a damping in a numerator of the inverse transmission function; and

damping load jolts by selecting a time constant and a damping in the denominator of the inverse transmission function.

2. The method according to claim 1, which comprises selecting the transmission function of the transmission system as a system of the second order with conjugate complex pole point.

3. The method according to claim 1, which comprises feeding back rotational speed to calculate the quantity of fuel to be supplied, and connecting a band filter in a feedback branch for suppressing a frequency range of the bouncing oscillations.

4. The method according to claim 1, which comprises feeding back rotational speed to calculate the quantity of fuel to be supplied, and connecting a low-pass filter in a feedback branch for suppressing a frequency range of the bouncing oscillations.