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公开(公告)号：US11795886B2
公开(公告)日：2023-10-24
申请号：US17549288
申请日：2021-12-13
申请人： Caterpillar Inc.
IPC分类号： F02D41/20
CPC分类号： F02D41/20 , F02D2041/2034 , F02D2041/2051 , F02D2200/0602 , F02D2200/0606 , F02D2200/101
摘要： Operating an engine system and fuel system includes energizing a solenoid actuator for a spill valve in a fuel injector in a first engine cycle via a standard waveform to inject a shot of fuel. Operating an engine system and fuel system further includes determining suitability for reduced energy operating of the fuel system, and energizing the solenoid actuator via a reduced energy waveform based on the determining suitability so as to inject one or more shots of fuel in a second engine cycle. The operating methodology and control logic can extend an engine speed range for multi-shot fuel injection in an engine.
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公开(公告)号：US11795887B1
公开(公告)日：2023-10-24
申请号：US17813516
申请日：2022-07-19
申请人： Caterpillar Inc.
CPC分类号： F02D41/20 , F02D41/221 , F02D41/401 , F02D2041/2041 , F02D2041/2055 , F02D2041/2058 , F02D2041/224
摘要： A fuel injection system includes a fuel injector, the fuel injector having an injection control valve, a solenoid that, when energized, is configured to modify a position of the injection control valve, and a controller. The controller is configured to generate a command for energizing the solenoid, identify variability in one or more injection events, and based on the identified variability, increase an amount of energy supplied to the solenoid.
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公开(公告)号：US20230184189A1
公开(公告)日：2023-06-15
申请号：US17549288
申请日：2021-12-13
申请人： Caterpillar Inc.
IPC分类号： F02D41/20
CPC分类号： F02D41/20 , F02D2041/2034 , F02D2041/2051 , F02D2200/0602 , F02D2200/0606 , F02D2200/101
摘要： Operating an engine system and fuel system includes energizing a solenoid actuator for a spill valve in a fuel injector in a first engine cycle via a standard waveform to inject a shot of fuel. Operating an engine system and fuel system further includes determining suitability for reduced energy operating of the fuel system, and energizing the solenoid actuator via a reduced energy waveform based on the determining suitability so as to inject one or more shots of fuel in a second engine cycle. The operating methodology and control logic can extend an engine speed range for multi-shot fuel injection in an engine.
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公开(公告)号：US11293370B1
公开(公告)日：2022-04-05
申请号：US16953841
申请日：2020-11-20
申请人： Caterpillar Inc.
摘要： A method for controlling a fuel injector of an engine system includes applying a pull-in current to close a spill valve of the fuel injector and detecting a timing at which the spill valve closes. The method also includes adjusting at least one of an amplitude of the pull-in current, a duration of the pull-in current, or a timing of a start of an application of the pull-in current based on the detected timing of the closing of the spill valve.
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公开(公告)号：US12116941B1
公开(公告)日：2024-10-15
申请号：US18228845
申请日：2023-08-01
申请人： Caterpillar Inc.
CPC分类号： F02D1/18 , F02D41/009
摘要： Operating a fuel system for an engine includes moving a plunger during a pumping cycle between an advanced position and a retracted position, and pulsing a solenoid actuator in an electrical circuit during at least one off cycle of the plunger where the plunger is neither advancing nor retracting with a plurality of current pulses of varied duration. An electrical property such as a freewheeling response in the electrical circuit induced by moving a valve in response to each respective current pulse is monitored, and a valve timing of the valve determined based on the monitored electrical property. The fuel system including a fuel injector may be electronically trimmed based on the determined valve timing. Related apparatus and control logic is also disclosed.
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公开(公告)号：US12110832B2
公开(公告)日：2024-10-08
申请号：US17817036
申请日：2022-08-03
申请人： Caterpillar Inc.
CPC分类号： F02D41/20 , F02D41/401 , F02D2041/2048 , F02D2041/2055 , F02D2041/2058
摘要： A fuel injection installation method includes detecting an actuation timing of a first valve of a fuel injector, detecting an actuation timing of a second valve of the fuel injector, detecting a return timing of the first valve of the fuel injector, and detecting a return timing of the second valve of the fuel injector. The method includes, for one or more fuel injection events, modifying at least one of: a maximum amplitude of solenoid current, an average amplitude of solenoid current, a start time of solenoid current, an end time of solenoid current, or a total time of solenoid current. The modification is based on the actuation timing of the first valve, the actuation timing of the second valve, the return timing of the first valve, and the return timing of the second valve, and may be performed for installation of the fuel injector.
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