Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1997-11-26
2000-05-16
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
701 58, 701 60, 477121, 477158, 180167, 180 651, 180197, 318139, 318587, 318170, 74335, G06G 770
Patent
active
060649348
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method and an arrangement for controlling the torque outputted by a drive unit.
BACKGROUND OF THE INVENTION
It is known from U.S. Pat. No. 5,558,178 that the torque of a drive unit can be adjusted in dependence upon a pregiven desired torque value. This desired torque value is pregiven by the driver by actuating an operator-controlled element or is pregiven by additional control systems of the motor vehicle such as a drive slip control. Furthermore, and in the context of the above-identified patent application, it is suggested that a desired torque value for controlling the drive unit is transmitted from the transmission control to improve the shifting operation of an automatic transmission. This desired torque value represents the torque which is to be realized during the shifting operation. If no data as to the desired torque to be adjusted is available to the control of the drive unit during a transmission intervention, then the shift operation cannot be controlled in the manner desired. In lieu thereof, a complex adaptation of ignition angle, air supply and/or fuel supply in dependence upon the particular shift operation would have to be pregiven.
SUMMARY OF THE INVENTION
It is an object of the invention to provide measures, with the aid of which the torque of a drive unit can be adjusted via a desired torque value, even in combination with an automatic transmission, without such desired values being provided from the transmission control.
An adjustment of the torque, which is outputted by the drive unit, is made possible via a corresponding desired value (even in combination with an automatic transmission) during a shift operation and/or to protect the transmission. This adjustment is made without data as to the desired values for the torque, which is to be adjusted, being present from the transmission control.
It is especially advantageous that this procedure can be utilized for control systems wherein no torque data is transferred between transmission control unit and engine control unit, that is, in the event of a malfunction of this transfer in control systems wherein torque desired values are transferred from the transmission control to the engine control.
It is especially advantageous that a maximum adjustable torque is pregiven to protect the transmission. In this way, damage to the transmission unit can be effectively avoided for a standing or slowly travelling vehicle as a consequence of a torque which is adjusted too high.
With respect to the transmission, it is especially advantageous that the effective desired torque value is determined by the engine control itself in dependence upon variables available thereto. In an advantageous embodiment, only the data as to the shift operation is needed from the transmission control.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described below with respect to the embodiments shown in the drawing. Here,
FIG. 1 shows an engine control apparatus; whereas,
FIG. 2 shows an overview block circuit diagram of the solution of the invention.
FIG. 3 shows the solution of the invention as a flowchart; whereas, in
FIG. 4, the operation of the solution of the invention is shown with respect to exemplary time-dependent traces.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
FIG. 1 shows a control unit 10 for controlling the torque of a drive unit. The control unit 10 includes at least one microcomputer (not shown) which operates on the output variables of the control unit 10 in the context of a control of the torque of the drive unit in dependence upon the supplied input variables. In the preferred embodiment, the control unit 10 is supplied via an input line 12 with an actuating signal of an accelerator pedal. The actuating signal is detected by a measuring device 14. In addition, a measure for the engine rpm is supplied via an input line 18 to the control unit 10. This measure for the rpm is from an rpm sensor 16. Also, and in a preferred embodiment, an input line 20 leads from an
REFERENCES:
patent: 5558178 (1996-09-01), Hess et al.
patent: 5757153 (1998-05-01), Ito et al.
patent: 5790967 (1998-08-01), Kull et al.
Cuchlinski Jr. William A.
Hernandez Olga
Ottesen Walter
Robert & Bosch GmbH
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