Cylinder-selective injection system
AssigneeRobert Bosch GmbH
InventorsHelmut Denz, Winfried Moser, Wolfgang Hoptner, Helmut Gross, Christian Klinke, Karl-Heinz Gerlings, Klemens Grieser, Klaus Bottcher
Life of this patent
Estimating the term…
Abstract
In a cylinder-selective injection system for an internal combustion engine, there are cylinder-selective injection suppressions. Subsequent to the suppressions, restoring added quantities specific to an individual cylinder are generated, whose initial value is dependent upon the number of suppressed injections for the cylinder in question, and whose notching-down to zero is dependent upon the number of injections of the cylinder that have taken place after completion of the suppression.
Claims16
An apparatus for controlling a cylinder-selective fuel injection system for an internal combustion engine having cylinder-selective fuel injection suppression for providing a reduction in drive torque to effect at least one of traction control, deceleration fuel cutoff, and rotational speed limitation, comprising:
- a control unit coupled to the fuel injection system, the control unit performing the steps of:
- determining an added fuel quantity to be fed to each cylinder of the engine upon restoration of fuel injection to the respective engine cylinder;
- initializing the added fuel quantity for each engine cylinder based upon a number of suppressed fuel injections for the respective engine cylinder;
- decrementing the added fuel quantity for each engine cylinder to zero based upon a number of fuel injections to the respective engine cylinder taking place after the number of suppressed fuel injections;
- and
- applying the added fuel quantity for each engine cylinder to the fuel injection system so that the fuel injection system injects a fuel injection quantity including the added fuel quantity into each respective engine cylinder.
A method for controlling a cylinder-selective fuel injection system for an internal combustion engine having cylinder-selective fuel injection suppression for providing a reduction in drive torque by providing at least one of traction control, deceleration fuel cutoff, and rotational speed limitation, comprising the steps of:
- (a) calculating an injection time and angle for a next fuel injection or fuel suppression for the engine cylinder;
- b) checking a state of a suppression bit;
- c) calculating a value for a restoring added fuel quantity, the value being dependent upon a number of prior fuel suppressions and a notching-up rate if the suppression bit is set, and being dependent upon a number of fuel injections and a notching-down rate if the suppression bit is not set;
- and
- d) performing the next fuel injection or fuel suppression by injecting a fuel injection quantity including the restoring added fuel quantity into the engine cylinder if the suppression bit is not set, and by refraining from injecting fuel if the suppression bit is set.
Dependencies are inferred from the claim text.