Back to results
US 6,617,755 B2Granted
Piezoelectric actuator drive circuit and fuel injection system
AssigneeDenso Corporation
InventorSatoru Kawamoto
Life of this patent
Estimating the term…
Abstract
A piezoelectric actuator drive circuit has an abnormality detection circuit section. The abnormality detection circuit section is provided with a voltage detection circuit for detecting the voltage of a connection terminal on the non-ground side and a comparison circuit for generating a comparison signal to check whether a detected voltage is higher than a reference voltage or not based on the comparison result between the detected voltage and the reference voltage. If the detected voltage is lower than the reference voltage, it is determined that a cable is disconnected.
Claims7
A piezoelectric actuator drive circuit comprising:
- a charge/discharge circuit section for charging and discharging a piezo-stack mounted on a piezoelectric actuator;
- a pair of positive and negative connection terminals connected to a current supply cable that extends to the piezo-stack;
- and
- an abnormality detection circuit section for detecting a conduction abnormality of the current supply cable,
- wherein the abnormality detection circuit section includes:
- a voltage detection means for detecting a voltage at a non-ground side connection terminal out of the connection terminals;
- and
- a comparison means for comparing a detected voltage with a reference voltage for supplying a comparison signal.
5 more elements
Dependencies are inferred from the claim text.