About 82 results
https://drivepatents.com/patents/1079250 · 16 Mar 2005
The present invention discloses a method of operating an injector comprising a piezoelectric actuator for displacing an injector needle to open an injector port of a fuel injector, wherein a voltage in an operating voltage range is applied to said piezoele...
https://drivepatents.com/patents/1080072 · 9 Feb 2005
A combustion engine fuel measurement system piezo actuator (316) functional diagnosis procedure either applies a preset voltage and compares the resulting charge (318) with the expected value (304) or applies a preset electrical charge and compares the vol...
https://drivepatents.com/patents/1081337 · 22 Dec 2004
The method involves converting a measurement signal acquired in analog form and representing the electrical operating state and/or operating process of an electrical line (7,9) and/or the final control element (3,5) into a digital measurement signal and us...
https://drivepatents.com/patents/1082073 · 1 Dec 2004
An electromagnetic delivery valve (14) is operated according to engine operation state to supply liquid fuel to an injection unit (15) comprising a piezoelectric or electrostrictive element to decompose injected fuel into fine particles. An electric contro...
https://drivepatents.com/patents/1082831 · 27 Oct 2004
The device has a resonance inductor (Lp) in series with a bridge of four switches (P11,P12,P21,P22) and connected parallel to two end terminals (B1,B2). Each switch is associated to a diode (d11,d12,d21,d22) for blocking a current path in one direction of ...
https://drivepatents.com/patents/1082999 · 20 Oct 2004
The device has an inductor in series with an assembly of two parallel branches, having switches (P11, P12) in series with diodes (d1, d2), respectively, coupled parallel to two terminals of a continuous voltage source (E). The diodes are coupled by a junct...
https://drivepatents.com/patents/1083736 · 22 Sep 2004
The computer (50) contains a memory (52) which may be a diskette, a CD or a flash memory. The computer sends control signals to a piezoelectric valve actuator (100) and to a direct fuel injection system. The piezoelectric actuator drives the valve (300) vi...
https://drivepatents.com/patents/1084544 · 25 Aug 2004
The method involves determining (140) a characteristic of the actuator, comparing (150) the determined characteristic with an expected characteristic and identifying a fault in the injector if there is a deviation between the determined and anticipated cha...
https://drivepatents.com/patents/1084929 · 11 Aug 2004
A method of operating a piezoelectric actuator including a stack (14) of one or more elements of piezoelectric material comprises the following steps: at a first time (i) varying the charge across the stack between a first positive charge level (+Q1) and a...
https://drivepatents.com/patents/1085455 · 21 Jul 2004
An amount of charge attached to a piezoelectric actuator (2) is determined in the actuator's operating points along with the voltage applied on the actuator. Lengthwise stretch in the actuator and force acting on the actuator are compared with preset thres...