Liebherr-International‘s patent describes a device for detecting the state of a fuel injector in an engine. It includes an injector, a switch that changes state based on the injector’s condition, and an evaluation unit that measures signals to determine the switch state, featuring a passive signal filter for enhanced detection. GlobalData’s report on Liebherr-International gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Liebherr-International, was a key innovation area identified from patents. Liebherr-International's grant share as of July 2024 was 47%. Grant share is based on the ratio of number of grants to total number of patents.
Device for detecting fuel injector switch states
The patent US12065981B2 describes a device designed to detect the operational state of a fuel injector within an internal combustion engine. The device includes an injector that injects fuel into the engine's combustion chamber, a switch formed by the injector housing and nozzle needle, and an evaluation unit that determines the switch's state. The switch changes its state based on whether the injector is open or closed. The device features an input line for energy supply to an actuating element, which adjusts the injector nozzle needle, and an output line for energy conduction away from the actuating element. A signal filter composed solely of passive components is integrated to enhance the signal generated by the switch's operation, allowing for accurate state detection.
Additionally, the device may include an electronic control unit that manages the evaluation unit and is connected to both the input and output lines. This control unit can apply a higher voltage to the input line compared to the output line, with specified voltage differences of 12V, 24V, or 48V. The design allows for various configurations, including the use of resistors for switch contacts and a common housing for the injector and switch. The evaluation unit can perform signal measurements at either the input or output line, with the option to integrate the signal filter within the control unit or in the cabling. The injector can be a common-rail type, and the entire system is intended to enhance the reliability and efficiency of fuel injection in internal combustion engines.
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