Method, device and control unit and machine-readable medium for valve closing time monitoring
A time monitoring, valve closing technology that can be used in measuring devices, machines/engines, fuel injection devices, etc. to solve problems such as valve closing time offset
Active Publication Date: 2021-12-21
ROBERT BOSCH GMBH
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- Application Information
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Problems solved by technology
[0005] However, there is currently no technology to let the user know that a vehicle's injectors have experienced a valve closing time offset
Method used
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Embodiment Construction
[0019] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0020] figure 1 A schematic architecture diagram of a system for monitoring valve closing time according to an embodiment of the present invention is shown. figure 1 The illustrated system 10 for valve closing time monitoring can detect whether the valve closing time of an injector IN for a large vehicle is shifted.
[0021] Such as figure 1 As shown, system 10 may include switch 20 , sensor 30 and control unit 40 . Both ends of the switch 20 are connected to the electromagnetic coil of the injector IN (that is, short-circuit the electromagnetic coil of the injector IN), so that when the switch 20 is closed, the electromagnetic coil of the injector IN is closed by the switch 20 circuit. The sensor 30 is used to measure the magnitude of the current flowing through the solenoid coil of the injector IN when the switch 20 is closed.
[0022] The...
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The present invention relates to a method, a device and a control unit for valve closing time monitoring, the method comprising: when the electromagnetic coil in the fuel injector is stopped supplying excitation current, controlling the switch for short-circuiting the electromagnetic coil to be closed to Enable the electromagnetic coil to generate an induced current by inducing the alternating magnetic field caused by the eddy current in the armature assembly of the injector; calculate the time from when the electromagnetic coil is stopped supplying the exciting current to when the electromagnetic coil flows through the electromagnetic coil The length of time between the moments when the induced current of the coil is the largest is taken as the actual valve closing time of the fuel injector; if the actual valve closing time is different from the reference valve closing time of the fuel injector, then determine the The valve closing time of the fuel injector deviates; and, sending a message indicating that the valve closing time of the fuel injector deviates to the server. With the method, the device and the control unit, it is possible to detect whether a valve closing time of a fuel injector for a vehicle is shifted.
Description
technical field [0001] The present invention relates to fuel injectors for vehicles, and more particularly to methods, devices and control units and machine-readable media for valve closing time monitoring. Background technique [0002] The engines of large vehicles, such as trucks or passenger cars, are usually equipped with fuel injectors for supplying fuel to the combustion chambers of the engine during engine operation. [0003] A fuel injector for a large vehicle includes at least a solenoid, an armature assembly, a needle valve, and a nozzle. When the fuel injector is required to supply fuel to the engine, the electromagnetic coil of the fuel injector is provided with excitation current to generate a magnetic field, which will lift the armature assembly of the fuel injector upwards to leave its original position, so that the high-pressure fuel can push the injector away. The needle valve of the oil injector can spray from the oil nozzle of the injector to the combusti...
Claims
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IPC IPC(8): F02M65/00
CPCF02M65/00
Inventor 冯帅李国宁唐仲基周斌
Owner ROBERT BOSCH GMBH