Title:
PIEZOELECTRIC ELEMENT DRIVING CIRCUIT
Document Type and Number:
Japanese Patent JP2773585
Kind Code:
B2
Abstract:
PURPOSE: To apply an optimum level initial voltage to a piezoelectric element and inject the accurate quantity of fuel by a fuel injection valve from initial injection.
CONSTITUTION: The applied voltage of a piezoelectric element M3 for driving a fuel injection valve M2 is controlled by a control means M1 to control the piezoelectric element condition such as the quantity of charged electric charge of the piezoelectric element M3 or the quantity of charged energy. Voltage small enough not to induce fuel injection from the fuel injection valve M2 is applied to the piezoelectric element M3 by a charging means M4, to carry out charging. The electrostatic capacity and the internal resistance of the piezoelectric element M3 are calculated by a calculation means M5 based on the charging time by the charging means M4 and the power source voltage variation width between before and after the charging or the quantity of charged electric charge.
Inventors:
Hironao Hayashi
Motoshi Kondo
Motoshi Kondo
Application Number:
JP30133092A
Publication Date:
July 09, 1998
Filing Date:
November 11, 1992
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B06B1/06; F02D41/20; F02D41/40; H01L41/08; H01L41/09; (IPC1-7): F02D41/20; B06B1/06; F02D41/40; H01L41/09
Domestic Patent References:
| JP6372381A | ||||
| JP2103970A | ||||
| JP350360A | ||||
| JP6397854A | ||||
| JP63183250A |
Attorney, Agent or Firm:
Tadahiko Ito