Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
1999-10-26
2001-05-29
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
C701S085000, C701S086000, C701S103000, C701S104000
Reexamination Certificate
active
06240355
ABSTRACT:
BACKGROUND INFORMATION
According to German Patent No. 195 18 813 (corresponding to U.S. Pat. No. 5,676,111), on the basis of a torque setpoint supplied under active engine drag torque control, a setpoint governing the air supply to an internal combustion and an alteration of the ignition angle setting of the internal combustion engine is effected in such a way that the torque of the internal combustion engine takes on the specified setpoint value. In this design approach, air alteration and ignition angle alteration take place in parallel to one another under active engine drag torque control. Because the action on the ignition angle affects the torque more quickly than the action via the air supply, which is associated with longer lag times, substantial changes in the ignition angle result, by which the instantaneous differences between torque and setpoint are compensated. This is undesirable in some applications, for example with a view to control comfort and control quality.
SUMMARY OF THE INVENTION
It is an object of the present invention to identify actions with whose help an engine drag torque control is improved.
The present invention provides an engine drag torque control characterized by high control comfort. By virtue of the fact that the setting of the air supply remains substantially constant during engine drag torque control, changes in the outputs (output magnitude) of the engine drag torque control are regulated almost exclusively by a fast action on the engine (e.g., action on the ignition angle). This means that the control operates more smoothly on the whole and is nevertheless distinguished by good controllability. Wheel paths (profiles) at the slip optimum are achieved by virtue of the fast action on the engine. Phases in which drive slip occurs are effectively avoided.
It is particularly advantageous that the slow integral component of the engine drag torque controller gives the setpoint for the air supply, while the rapidly varying proportional and differential components act on the ignition angle path or, respectively, injection path.
In an exemplary embodiment, it is further advantageous that a further fast action (e.g., action on the fuel supply) is activated as a function of the slip, the wheel acceleration, and the time variation and/or the magnitude of the actual drive torque.
REFERENCES:
patent: 5168952 (1992-12-01), Oono et al.
patent: 5657230 (1997-08-01), Hess et al.
patent: 5676111 (1997-10-01), Zhang
patent: 5868474 (1999-02-01), Abe et al.
patent: 6098592 (2000-08-01), Hess et al.
patent: 195 18 813 (1996-12-01), None
Cuchlinski Jr. William A.
Kenyon & Kenyon
Marc-Coleman Marthe
Robert & Bosch GmbH
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