US 12,276,569 B2
Method for recognizing an error in a sensor signal during operation of a fuel injector
Lars-Oliver Rack, Marbach (DE); Ralph Kober, Markgroeningen (DE); Andreas Schmitt, Horneburg (DE); and Egbert Fuchs, Stuttgart-Feuerbach (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Sep. 29, 2022, as Appl. No. 17/956,513.
Claims priority of application No. 10 2021 211 261.7 (DE), filed on Oct. 6, 2021.
Prior Publication US 2023/0107124 A1, Apr. 6, 2023
Int. Cl. G01M 15/04 (2006.01)
CPC G01M 15/042 (2013.01) 12 Claims
OG exemplary drawing
 
1. A method for recognizing an error in a sensor signal during operation of a fuel injector of an internal combustion engine, in which a switch valve of the fuel injector is activated using an activation signal, and in which the sensor signal is detected as a signal of a sensor, which is provided for detecting characteristic operating points of the fuel injector, the method comprising:
in a predefined time window of the sensor signal, which includes a point in time of a characteristic operating point of the fuel injector, determining at least one property of the sensor signal, which includes a signal level and/or a rise time; and
determining, based on the at least one property of the sensor signal, whether an error is present, wherein the error, which is determined based on the signal level as the at least one property of the sensor signal, includes the presence of a short-circuit of the sensor, and/or the error, which is determined based on the rise time as the at least one property of the sensor signal, includes a contact resistance between the sensor and a read-out unit, which is higher than a setpoint value.