Circuit arrangement for controlling an injection valve
First Claim
1. A circuit arrangement for actuating at least one injection valve of an internal combustion engine, the circuit arrangement comprising:
- a supply potential connection for carrying a first voltage;
a reference-ground potential connection;
at least one cylinder coil having a first coil connection and a second coil connection, wherein a voltage is applied to said first coil connection of said cylinder coil for operating an associated injection valve;
a controllable voltage doubling circuit configured to produce from the first voltage a second voltage that is higher than the first voltage, said voltage doubling circuit having a first input connected to said supply potential connection, said voltage doubling circuit including a second input connected to said reference-ground potential connection, said voltage doubling circuit including two semiconductor elements connected in series with each other and connected between said supply voltage connection and said reference-ground potential connection, each one of said two semiconductor switching elements having a control connection, said voltage doubling circuit including a first output, a second output, a first diode, a first capacitor, a second capacitor, a second diode, a first node connected between said two semiconductor switching elements, and a second node, said first diode, said first capacitor, said second capacitor, and said second diode connected in series to thereby form a series circuit having a center tap at said second node said series circuit connected between said supply potential connection and said reference-ground connection, said voltage doubling circuit including a first output formed by a connecting point between said first diode and said first capacitor, said voltage doubling circuit including a second output formed by a connecting point between said second capacitor and said second diode, and said voltage doubling circuit including a first controllable semiconductor element connecting said first output to said cylinder coil;
an actuation circuit connected to said control connection of each one of said two semiconductor switching elements;
a first current measurement device connecting said second coil connection of said at least one cylinder coil to said reference-ground potential connection; and
a component selected from the group consisting of;
said first current measuring device and a fourth semiconductor switching element being different from said first current measurement device, said component selectively breaking a connection between said second coil connection and said reference-ground potential connection.
1 Assignment
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Accused Products
Abstract
A circuit arrangement controls at least one injection valve, in particular a solenoid injection valve, for an internal combustion engine. The circuit includes a supply potential connection, a reference potential connection; one or more solenoids; a controllable voltage boosting circuit for generating from the first voltage a second voltage that is higher than the first voltage. The voltage boosting circuit is connected at a first input to the supply potential connection and at a first output to the solenoids by means of a respective first controllable semiconductor switching element. A control circuit is connected at least to a respective first semiconductor switching element and the voltage boosting circuit. The control circuit applies the first or the second voltage to the first coil connection of exactly one solenoid depending on an actuation state of one of the injection valves.
15 Citations
17 Claims
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1. A circuit arrangement for actuating at least one injection valve of an internal combustion engine, the circuit arrangement comprising:
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a supply potential connection for carrying a first voltage; a reference-ground potential connection; at least one cylinder coil having a first coil connection and a second coil connection, wherein a voltage is applied to said first coil connection of said cylinder coil for operating an associated injection valve; a controllable voltage doubling circuit configured to produce from the first voltage a second voltage that is higher than the first voltage, said voltage doubling circuit having a first input connected to said supply potential connection, said voltage doubling circuit including a second input connected to said reference-ground potential connection, said voltage doubling circuit including two semiconductor elements connected in series with each other and connected between said supply voltage connection and said reference-ground potential connection, each one of said two semiconductor switching elements having a control connection, said voltage doubling circuit including a first output, a second output, a first diode, a first capacitor, a second capacitor, a second diode, a first node connected between said two semiconductor switching elements, and a second node, said first diode, said first capacitor, said second capacitor, and said second diode connected in series to thereby form a series circuit having a center tap at said second node said series circuit connected between said supply potential connection and said reference-ground connection, said voltage doubling circuit including a first output formed by a connecting point between said first diode and said first capacitor, said voltage doubling circuit including a second output formed by a connecting point between said second capacitor and said second diode, and said voltage doubling circuit including a first controllable semiconductor element connecting said first output to said cylinder coil; an actuation circuit connected to said control connection of each one of said two semiconductor switching elements; a first current measurement device connecting said second coil connection of said at least one cylinder coil to said reference-ground potential connection; and a component selected from the group consisting of;
said first current measuring device and a fourth semiconductor switching element being different from said first current measurement device, said component selectively breaking a connection between said second coil connection and said reference-ground potential connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification