Device and method for determining the start of injection in a direct-injection internal combustion engine
AssigneeSiemens Aktiengesellschaft
InventorsRalf Schernewski, Achim Przymusinski, Thomas Brandmeier
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Abstract
A device for determining a start of injection in a direct-injection internal combustion engine has a magnetoelastic pressure sensor disposed in an injection line leading to an injection valve which detects pressure changes in the injection line owing to an injection process of the injection valve by utilizing the magnetoelastic effect. The device also has an evaluation device that determines a dead time between an initiation of the injection process and the start of injection with the aid of the measurement signal of this magnetoelastic pressure sensor.
Claims19
In combination with a direct-injected internal combustion engine having an injection valve and an injection line connected to the injection valve, a device for determining a start of injection of a fuel in the direct-injection internal combustion engine, comprising:
- a pickup disposed on the injection line connected to the injection valve, said pickup detecting a magnetoelastic effect in the fuel caused by a pressure change in the injection line due to an injection process of the injection valve and outputting a measurement signal for determining the start of injection.
A method for determining a start of injection of a fuel in a direct-injection internal combustion engine, which comprises:
- a providing a pickup having a coil;
- placing the coil on an injection line connected to an injection valve;
- detecting with the coil a magnetoelastic effect in the fuel caused by a pressure change in the injection line due to an injection process of the injection valve;
- and outputting a measurement signal for determining a start of injection when a change in voltage in the coil has been detected.
In combination with a direct-injected internal combustion engine having an injection valve and an injection line connected to the injection valve, a device for determining a start of injection of a fuel in the direct-injection internal combustion engine, comprising:
- a pickup disposed on the injection line connected to the injection valve, said pickup detecting a magnetoelastic effect in the fuel caused by a pressure change in the injection line due to an injection process of the injection valve and outputting a measurement signal for determining the start of injection, said pickup having a transformer with two coils detecting a voltage induced by the pressure change in the injection line, a first of said coils wound around said injection line to detect a voltage induced by a pressure change in the injection line, a second of said coils not wound around said injection line, said second coil determining a premagnetization of said coils.
Dependencies are inferred from the claim text.