Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Reexamination Certificate
1998-12-11
2001-08-07
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
C701S070000
Reexamination Certificate
active
06272408
ABSTRACT:
BACKGROUND OF THE INVENTION
U.S. Pat. No. 5,558,178 discloses that data can be exchanged between various control units for controlling a motor vehicle. The data can be exchanged, for example, via a data bus such as CAN. In this patent, a control system for the drive unit of a motor vehicle is described to which, in specific operating states, input values for the torque of the drive unit are transmitted from at least one additional control unit. The at least one additional control unit defines at least one of the following: a control unit for carrying out a drive-slip control, a driving dynamic control, an electronic transmission control unit or a control unit for controlling the distance to a forward vehicle. The desired torque values, which are transmitted in this way, are converted by the motor control unit so that the torque of the drive unit approximates the externally supplied desired value in the above-mentioned operating states. The consistency or actuality of the transmitted data is then of special significance.
To monitor the actuality of the transmitted data, a message count is transmitted from the additional control unit at time points which changes regularly and the motor control unit checks the actuality of the transmitted data on the basis of this message count. To check consistency of the input values, plausibility checks are provided from which the correctness of the transmitted desired torque values can be derived with great probability.
SUMMARY OF THE INVENTION
It is an object of the invention to provide measures with which the monitoring of the data transmission as to actuality and/or consistency is made possible with the least complexity.
The method of the invention is for transmitting data in a motor vehicle having at least one control unit. The method includes the steps of: causing the control unit to transmit pieces of data in the context of a first message containing a first operating variable and a second message containing a second operating variable not present simultaneously with the first operating variable; and, causing the control unit to transmit an additional piece of data in the context of the second message.
The data are transmitted for checking the actuality and/or consistency of an active desired input. These data are transmitted in the context of a desired message which is not active. With this measure, additional messages and therefore memory capacity are saved. A precondition is that the two desired messages cannot be active at the same time.
The transmission of the message count for the actuality check and/or the transmission of a support value for the consistency check is especially advantageous in a non-active desired message.
Special advantages are afforded with respect to this procedure in connection with a drive-slip control (ASR) and a motor drag torque control (MSR) wherein respectively separate desired messages (which are never simultaneously active) are transmitted between the control unit, which computes the desired message, and the receiving motor control unit. The application in combination with a CAN interface between two control apparatus is especially advantageous.
The application for an interface is especially advantageous wherein two desired messages are transmitted for at least one of the functions to be carried out (for example, ASR and MSR). The message count and the consistency check value can then be transmitted simultaneously when the desired message of the other function is active.
REFERENCES:
patent: 5558178 (1996-09-01), Hess et al.
Cuchlinski Jr. William A.
Ottesen Walter
Pipala Edward
Robert & Bosch GmbH
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