About 82 results
https://drivepatents.com/patents/1086324 · 16 Jun 2004
The method involves detecting and evaluating at least one physical parameter indicative of the current length of the actuator(s) (P1 to P4). A check is made to determine if the parameter exceeds or falls below a threshold, and the actuator is driven at res...
https://drivepatents.com/patents/1086906 · 26 May 2004
The system includes a first stage producing amplification of the supply voltage in order to generate a high voltage (Va). A second stage, including an inductor in an oscillating circuit, generates a current (i2) to supply the injectors (Pi). Third and four...
https://drivepatents.com/patents/1087164 · 19 May 2004
The electronic supply uses a DC to AC inverter to produce a high frequency electrical signal at the primary winding of a transformer (N1) which produces a high voltage to drive piezoelectric actuators (IJ) through selector switches (K1,K2,R3,R4). The inver...
https://drivepatents.com/patents/1087160 · 19 May 2004
The device (1) has an actuator having an actuating piece and an electrical control unit (L1), from an electrical actuator control topology (4) including a bridge circuit (5) with a continuous source (6) between the first and second circuit terminals (51,52...
https://drivepatents.com/patents/1087145 · 19 May 2004
The fuel injectors have multiple piezoelectric cells (16) to atomize the fuel. Control of the resonant fuel injectors uses a processing circuit (10,12) which monitors the periodic excitation of a fuel injector, and a selector (14) for the piezoelectric cel...
https://drivepatents.com/patents/1087245 · 12 May 2004
The piezoelectric actuator control system for fuel injector valves for an internal combustion engine has a charging and discharging circuit (6). This circuit has separate charging (S2) and discharging (S3) switches in parallel with diodes (D2,D3) and a tra...
https://drivepatents.com/patents/1087809 · 21 Apr 2004
A solenoid valve (14) opens/closes a discharge port that discharges fuel into an injection unit (15). A pressure sensor (35) installed in the fuel path, detects pressure of fuel in injection unit. An electronic control unit (ECU) (30) drives a piezoelectri...
https://drivepatents.com/patents/1088650 · 24 Mar 2004
The method involves determining a parameter for each of two or more piezoelectric actuators, and adjusting the parameters to a setting value. The parameter is determined based on an electrical value that is used to drive the piezoelectric actuator, e.g. th...
https://drivepatents.com/patents/1088631 · 24 Mar 2004
An injector system includes at least first and second injectors (22a, 22b), preferably of the piezoelectric type, and an injector drive control circuit. The drive control circuit (24) comprises select switch means (S1, S2) for controlling independent selec...
https://drivepatents.com/patents/1088845 · 17 Mar 2004
The injector (3) control mechanism (1) has a transducer which moves following a control signal. The signal is defined by a voltage, a frequency and an injection length. The voltage or frequency is a settable variable as a function of the instructions recei...