Patent ID: 6526945
Filing Date: 2003-03-04
Classification: F02D

Abstract:
A circuit arrangement for controlling at least one solenoid valve for fuel metering in an internal combustion engine, the circuit arrangement comprising:a first switching arrangement situated between a first supply voltage terminal of a battery supply voltage and a first terminal of the at least one solenoid valve; a second switching arrangement situated between a second terminal of an allocated one of the at least one solenoid valve and a second supply voltage terminal of the battery supply voltage; a storage capacitor for connection with the second terminal; a recharge circuit; and a third switching arrangement situated between the first terminal of the at least one solenoid valve and the recharge circuit; wherein: the second switching arrangement includes a control arrangement for controlling the second switching arrangement for storing energy in the storage capacitor as stored energy, the energy being released in one of (i) a rapid transition from a pickup current value to a retaining current value and (ii) another rapid transition from the retaining current value to a zero current strength, the stored energy being available for supplying the at least one solenoid valve in a booster phase; the first switching arrangement is switched off during the rapid transitions to minimize a battery voltage dependence; and the recharge circuit is connected with the first supply voltage terminal and the second supply voltage terminal, and includes the storage capacitor and a fourth switching arrangement that is controlled by the control arrangement and that activates the recharge circuit for recharging the storage capacitor, the recharge circuit being used for a voltage supply of the at least one solenoid valve via the third switching arrangement during the booster phase using the stored energy from the storage capacitor, and for producing a pre-stabilized recharge voltage for the storage capacitor from the battery supply voltage.