METHOD AND DEVICE FOR ACQUIRING AND TRANSMITTING OPERATING DATA OF AN INTERNAL COMBUSTION ENGINE
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Abstract
A method for acquiring operating data of an internal combustion engine in a control unit during a diagnostic function of the control unit, and for transmitting the operating data from the control unit to a diagnostics device, the operating data being determined in the control unit with the aid of sensors assigned to the internal combustion engine and/or from variables derived from output signals of the sensors and/or from control unit-internal variables. According to the invention, it is provided that a specification of an operating data type and of a temporal resolution of the value reception is transmitted from the diagnostics device to the diagnostic function, that the operating data are collected in the control unit with the aid of the diagnostic function, that the value acquisition is started by the diagnostics device, that the operating data are stored in a buffer memory in the control unit, and that the operating data are transmitted from the buffer memory to the diagnostics device. The diagnostics device and the control unit are connected via standardized interfaces, whose transmission speed is limited for reasons of cost and security from interference. Due to the configuration of the diagnostic function in the control unit according to the invention, not every operating data value is retrieved individually by the diagnostics device, but rather a series of operating data values are buffered in a buffer memory in the control unit, the speed of data acquisition may be selected independently of the transmission speed of the interface between the control unit and the diagnostics device, and thus in particular may also be higher. Data acquisition at 100 Hz is possible using the method, and data acquisition synchronous with the rotational speed is also attainable.
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Citations
16 Claims
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1-8. -8. (canceled)
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9. A method for acquiring operating data of an internal combustion engine in a control unit during a diagnostic function of the control unit, and for transmitting the operating data from the control unit to a diagnostics device, comprising:
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at least one of determining the operating data in the control unit using sensors assigned to the internal combustion engine, from variables derived from output signals of the sensors, and control unit-internal variables; transmitting a specification of an operating data type and of a temporal resolution of the value reception from the diagnostics device to the diagnostic function, collecting the operating data in the control unit with using the diagnostic device function; starting the value acquisition the diagnostics device, the operating data are stored in a buffer memory in the control unit, and the operating data are transmitted from the buffer memory to the diagnostics device. - View Dependent Claims (10, 13, 14)
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15. A device for acquiring operating data of an internal combustion engine in a control unit provided for controlling the internal combustion engine during a diagnostic function of the control unit, and for transmitting the operating data from the control unit to a diagnostics device connected to the control unit, at least one of:
- i) sensors being assigned to the control unit to acquire the operating data, and ii) functions being provided in the control unit which are provided for deriving operating data from the output signals of the sensors, and a diagnostic function being provided in the control unit, the device comprising;
a buffer memory in the control unit for storing the operating data; wherein the diagnostic function is configured for acquiring and storing data in the buffer memory at high time resolution. - View Dependent Claims (16)
- i) sensors being assigned to the control unit to acquire the operating data, and ii) functions being provided in the control unit which are provided for deriving operating data from the output signals of the sensors, and a diagnostic function being provided in the control unit, the device comprising;
Specification