A negative pressure abnormality detection apparatus includes a negative pressure sensor to output a signal representing negative pressure in a negative pressure chamber of a brake booster into which intake negative pressure of an intake manifold generated by rotation of an engine is introduced; a negative pressure detection unit to detect the negative pressure based on the signal; an abnormality determination unit to determine whether an abnormality occurs with the negative pressure sensor, based on whether the negative pressure is shifted toward atmospheric or vacuum pressure relative to a threshold, when a state continues for a predetermined time or longer during which the engine rotates and a negative-pressure-expending braking operation is not performed; and a threshold change unit to change the threshold depending on opening of a throttle valve in an intake pipe connected with the intake manifold, while the state continues.
Negative pressure abnormality detection apparatus, and control apparatus for internal combustion engine
17.04.2018
Patent
Elektronische Ressource
Englisch
Europäisches Patentamt | 2017
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|NEGATIVE PRESSURE ABNORMALITY DETECTOR AND INTERNAL COMBUSTION ENGINE CONTROLLER
Europäisches Patentamt | 2016
|NEGATIVE PRESSURE ABNORMALITY DETECTOR AND INTERNAL COMBUSTION ENGINE CONTROLLER
Europäisches Patentamt | 2016
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