Method and device for controlling a drive unit of a vehicle

Details Method and device for controlling a drive unit of a vehicle Method and device for controlling a drive unit of a vehicle

1999-05-10

2001-05-01

Solis, Erick (Department: 3747)

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

C123S406510, C123S406500, C123S492000

Reexamination Certificate

active

06223721

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a method and an arrangement for controlling a drive unit of a vehicle.
BACKGROUND OF THE INVENTION
Such a method and such an arrangement are known from U.S. Pat. No. 5,692,472. There, to control the drive unit, the torque or the power of the drive unit is adjusted electrically at least in dependence on the position of an operator-controlled element actuated by the driver. A maximum permissible torque or a maximum permissible power is determined on the basis of the position of the operator-controlled element as well as at least on the engine rpm. The maximum permissible torque or the maximum permissible power of the drive unit should not exceed the torque or the power during the actual operating state. The actually adjusted torque or the actually adjusted power of the drive unit is determined from operating variables such as engine rpm and the inducted air mass. This actual adjusted torque or power is compared to the maximum permissible value and a fault reaction is initiated when the computed torque or the computed power exceeds the maximum permissible torque or the maximum permissible power. With this monitoring measure, the operating reliability of the drive unit is ensured because a torque generation of the drive unit, which is increased compared to the driver command, can be prevented in a reliable manner. The response of the shown monitoring is only wanted in the actual case of a fault. In addition, operating situations are conceivable (for example, in transition states), in which the monitoring responds to tightly pregiven tolerances without a fault being present. Such a behavior is not wanted.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide measures which avoid an unwanted response of the described monitoring.
A control system for an internal combustion engine on the basis of a torque orientated functional architecture is known from U.S. Pat. No. 6,098,592. Here, a drive desired torque is formed from the position of the operator-controlled element, which is actuated by the driver, while considering at least the engine rpm. This driver desired torque is logically coupled to external and internal torque requirements in the context of coordinators for the adjustment of charge and for interventions (for example, ignition angle) which are synchronous with the crankshaft. The resulting desired torques are then, for example, converted into desired ignition angle and desired throttle flap position. Such an engine control system is shown in
FIGS. 1 and 2
.
It is ensured that the monitoring on the basis of computed and maximum permissible torque or power only responds and a fault reaction is initiated when an actual fault is present via the limiting of at least one desired value for a torque of the drive unit to the maximum permissible torque (or via a corresponding measure when the engine control computes engine power values in lieu of torque values). In this way, the driving comfort and the availability of the drive unit are considerably increased. It is especially advantageous that the tolerances for the monitoring of the drive unit on the basis of computed and maximum permissible torque or power can be pregiven very tightly so that, for an actual fault condition in the region of the engine control, this fault condition can be recognized very quickly and countermeasures initiated very rapidly.
In addition, it is of special advantage that the torque desired values for the charge path as well as for the rapid intervention path via injection suppression, the influencing of the fuel metering and/or of the ignition angle are limited to the maximum permissible torque for an engine control system having a torque-orientated functional architecture. In this way, in transition situations and in special situations, the maximum permissible torque cannot be exceeded and therefore a response of the torque monitoring is effectively avoided. The same applies for a power-orientated functional architecture.
It is especially advantageous that a hysteresis between switching on the limitation and switching off the limitation is provided, preferably for the rapid intervention quantities.
In an advantageous manner, the influence of the engine drag torque control (MSR) is considered. When the drag torque control is active, the limiting is disabled because the engine drag torque control can increase the power. In this way, the engine drag torque function is not negatively affected. It is especially advantageous that it operates only in the rapid path and the MSR can increase the torque for a short time.
For an intervention wherein the ignition angle can be switched off, it is especially advantageous to make triggering the limiting dependent upon the torque to be adjusted via the ignition angle; whereas, the switchoff of the limiting is pregiven in dependence, inter alia, on the torque for the fuel metering which is computed on the basis of the accelerator pedal position. For a switched-off ignition angle intervention, the desired torque for the ignition angle is orientated on the torque without intervention on the base torque adjusted from preprogrammed characteristic fields. For this reason, a limiting of the actual torque to the base value is achieved. This contributes in an advantageous manner to the operational reliability.


REFERENCES:
patent: 5101786 (1992-04-01), Kamio et al.
patent: 5625558 (1997-04-01), Togai et al.
patent: 5657230 (1997-08-01), Hess et al.
patent: 5676112 (1997-10-01), Bauer et al.
patent: 5692471 (1997-12-01), Zhang
patent: 5692472 (1997-12-01), Bederna et al.
patent: 5983861 (1999-11-01), Nishio et al.
patent: 6065446 (2000-05-01), Engl et al.
patent: 195 36 038 (1997-04-01), None

Affiliated with

Also associated with

Rating

Method and device for controlling a drive unit of a vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and device for controlling a drive unit of a vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for controlling a drive unit of a vehicle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2554426