Motor vehicle control device
A motor vehicle control device, in particular an engine control device or gearbox controller, has an interface for receiving at least one measured variable, a device for calculating at least one variable and a memory for storing the measured variable or each measured variable and/or the calculated variable or each calculated variable. The measured variable(s) and/or the calculated variable(s) can be stored on the basis of at least one freely definable trigger condition, specifically in such a way that, for the respective variable to be stored, it is possible to define a number and width of classes and intervals for the variable, wherein if the respective variable to be stored falls in one of the classes, a counter reading for this class is increased by a defined absolute amount.
1 . A motor vehicle control device, comprising:
an input for receiving at least one measured variable;
means for calculating at least one variable to define a calculated variable;
a memory for storing the at least one measured variable and/or the calculated variable, wherein the measured variable and/or the calculated variable is stored on a basis of at least one freely defined trigger condition, wherein, for a respective variable to be stored, a number and width of classes and intervals are defined for the variable, and, if the respective variable to be stored falls into one of the classes, a counter reading for the class is increased by a defined amount.
2 . The motor vehicle control device according to claim 1 , wherein the measured variable and/or the calculated variable is stored on a basis of a plurality of freely definable trigger conditions.
3 . The motor vehicle control device according to claim 1 configured as an engine control device.
4 . The motor vehicle control device according to claim 1 configured as a gearbox control device.
5 . The motor vehicle control device according to claim 1 , wherein, when the counter reading has reached a maximum permissible value in one of the classes for a variable to be stored, the counter readings of all classes corresponding to the variable to be stored are reduced by a common factor.
6 . The motor vehicle control device according to claim 1 , wherein, when the counter reading has reached a maximum permissible value in at least one of the classes for a variable to be stored, the functionality of the motor vehicle control device is modified and/or a warning message is generated.
7 . The motor vehicle control device according to claim 1 , wherein, when the respective variable to be stored falls in a given class, the counter reading for the given class is increased by 1, and when the counter reading has reached a maximum permissible value, the counter readings of all the corresponding classes for the given variable to be stored are halved.
8 . The motor vehicle control device according to claim 1 , wherein a time interval and/or events which occur during operation are defined as a trigger condition.
9 . The motor vehicle control device according to claim 2 , wherein a plurality of trigger conditions are combined with one another.
10 . The motor vehicle control device according to claim 1 , wherein the variable or each variable is stored in the form of a histogram.
11 . The motor vehicle control device according to claim 10 , wherein the histogram is stored in an engine control unit and the histogram is deleted only after a request by an external command or after a defined state has been reached.
12 . The motor vehicle control device according to claim 11 , which comprises a volatile memory and a nonvolatile memory, and the histogram is stored in said volatile memory and in said nonvolatile memory.
13 . A method of operating a motor vehicle control device, comprising:
receiving at least one measured variable related to an operation of the vehicle in the motor vehicle control device;
calculating at least one calculated variable from the measured variable;
storing the at least one measured variable and/or the calculated variable on a basis of one or more freely definable trigger conditions;
defining, for a respective variable to be stored, a number and a width of classes and intervals; and
if the respective variable to be stored falls into one of the classes, incrementing a counter reading for the class by a defined amount.
14 . The method according to claim 13 , wherein, if the counter reading has reached a maximum permissible value in one of the classes for a variable to be stored, reducing the counter readings of all the corresponding classes for the variable to be stored by a common factor.
15 . The method according to claim 13 , wherein, if the counter reading has reached a maximum permissible value in at least one of the classes for a variable to be stored, modifying a functionality of the motor vehicle control device and/or generating a warning message.
16 . The method according to claim 13 , wherein, if the respective variable to be stored falls into a given class, incrementing the counter reading for the given class by 1, and when the counter reading has reached a maximum permissible value, reducing the counter readings of all the corresponding classes for the variable by half.
17 . The method according to claim 13 , which comprises defining a time interval and/or events that occur during operation as a trigger condition.
18 . The method according to claim 13 , which comprises storing the variable or each variable in the form of a histogram.
19 . The method according to claim 18 , which comprises storing the histogram in an engine control unit and clearing the histogram only after receiving an external command or after a defined state has been reached.
20 . The method according to claim 18 , which comprises storing the histogram in a volatile memory and in a nonvolatile memory.