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US 11,371,457 B2Granted
Device and method for checking safety-relevant switch-off paths in control units during ongoing engine operation
AssigneeRobert Bosch GmbH
InventorsAndre Vogel, Christian Ruland, Sven Faehnle, Wolfgang Haag
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Abstract
A device and a method for checking switch-off paths in control units of internal combustion engines during ongoing engine operation.
Claims2
A device for checking switch-off paths in a control unit of an internal combustion engine during ongoing engine operation, comprising:
- a microcontroller configured to control engine management functions of the internal combustion engine;
- a voltage monitoring unit configured to monitor a voltage in the control unit;
- a monitoring module configured to monitor at least one state;
- and
- three switch-off paths including (i) a switch-off via ABE which is controlled by the voltage monitoring unit, (ii) a switch-off via WDA which is controlled by the monitoring module, and (iii) a switch-off via error pin which is controlled by the microcontroller.
2 more elements
A method for checking switch-off paths in a control unit of an internal combustion engines during ongoing engine operation, comprising;
- ascertaining a suitable or admissible time window, as a function of at least one of a clock, a phase or a rotational speed of the internal combustion engine;
- carrying out a switch-off path test within the time window, the time window being a time window in which components of the internal combustion engine are not activated;
- and
- repeating the switch-off path test in the event of an error within a defined time interval to a next check to prevent the rotational speed from dropping,
- wherein a sequence in which the tests are carried out includes (i) testing a switch-off via WDA, (ii) testing a switch-off via error pin and (iii) testing a switch-off via ABE.
2 more elements
Dependencies are inferred from the claim text.