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公开(公告)号：US20210033036A1
公开(公告)日：2021-02-04
申请号：US17074698
申请日：2020-10-20
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy , Gerald J. LaMarr, JR. , George M. Pattullo
Abstract: A speed regulating circuit in communication with an ignition circuit having a primary coil coupled to an ignition member to cause an ignition event within an engine, the speed regulating circuit being arranged to selectively prevent energy from the primary coil from being discharged to the ignition member to selectively prevent an ignition event. In at least some implementations, the speed regulating circuit includes a bidirectional or bilateral triode thyristor having an anode coupled to the primary coil and an anode coupled to ground, and an input gate that may be selectively actuated to route to ground energy received at the triode thyristor from the primary coil to inhibit transfer of energy from the primary coil to the ignition member. The triode thyristor may be selectively actuated, for example, as a function of engine speed, such as an engine speed above a threshold speed.
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公开(公告)号：US20200269409A1
公开(公告)日：2020-08-27
申请号：US16647896
申请日：2018-09-28
Applicant: Walbro LLC
Inventor： Matthew A. Braun , Cyrus M. Healy , Robby L. Linton
Abstract: A power tool may include an engine, a tool driven for movement by the engine, a brake mechanism coupled to the tool, a charge forming device coupled to the engine and a transmission member operably coupled to the brake mechanism and a throttle valve of the charge forming device. The brake mechanism inhibits movement of the tool in an engaged position of the brake mechanism and permits movement of the tool in a disengaged position of the brake mechanism. The charge forming device is coupled to the engine to provide a combustible fuel and air mixture to the engine, and the throttle valve is movable between a first position and a second position. The transmission member is operably coupled to the brake mechanism and the throttle valve so that the throttle valve is moved away from the first position when the brake mechanism is moved to the engaged position.
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公开(公告)号：US20190078547A1
公开(公告)日：2019-03-14
申请号：US15743104
申请日：2016-07-21
Applicant: WALBRO LLC
Inventor： Martin N. Andersson , Cyrus M. Healy
Abstract: In at least some implementations, an auxiliary power supply in an ignition system for a light-duty combustion engine includes a first auxiliary winding and a second auxiliary winding coupled in parallel with the first auxiliary winding such that both windings are arranged to provide power to an auxiliary load. The first auxiliary winding may include a greater number of turns than the second auxiliary winding. A ratio of the number of turns in the first auxiliary winding to the number of turns in the second auxiliary winding may be between 1.5:1 and 10:1, the first auxiliary coil and the second auxiliary coil may have between 50 and 2,000 turns, and the first auxiliary coil and the second auxiliary coil are formed from wire between 25 and 45 gauge.
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公开(公告)号：US20210254593A1
公开(公告)日：2021-08-19
申请号：US17270976
申请日：2019-09-06
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy
Abstract: In at least some implementations, a method of operating an ignition system for a combustion engine includes charging an energy storage device during at least a portion of the time when the engine is operating, permitting the level of energy stored on the charge storage device to decrease over time after the engine ceases to operate, determining the energy level on the energy storage device when the engine is restarted after having ceased operating, and setting at least one engine operational parameter as a function of the determined energy level. In at least some implementations, the at least one engine operational parameter may include one or more of: richness of a fuel and air mixture to be delivered to the engine, ignition timing, desired engine idle speed.
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公开(公告)号：US10954911B2
公开(公告)日：2021-03-23
申请号：US16342838
申请日：2017-10-19
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy
IPC: F02P3/08 , F02B63/02 , F02P5/15 , F02P11/04 , H04B1/40 , F02D41/28 , F02P11/00 , F02D41/26 , F02P3/06 , F02D41/22 , F02P3/09
Abstract: —In at least some implementations, a control and communication system for a light-duty combustion engine includes a circuit card, an ignition circuit carried by the circuit card and configured to control an ignition timing of the engine, and a short range wireless communication circuit carried by the circuit card. The communication circuit may include a Bluetooth Low Energy antenna. The ignition circuit may include an ignition capacitor that when drained induces an ignition pulse adapted to fire a spark plug. The system may further include a microprocessor that is coupled to and controls the ignition and communication circuits, and/or a clocking circuit adapted to provide a clocking frequency associated with the timing of the ignition circuit and associated with the communication circuit via a short range wireless communication protocol. The clocking circuit may include a crystal oscillator.
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Patent Agency Ranking
公开(公告)号：US20200291881A1
公开(公告)日：2020-09-17
申请号：US16763092
申请日：2018-11-27
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy , Dale P. Kus
Abstract: In at least some implementations, a method of controlling a fuel-to-air ratio of a fuel and air mixture supplied to an engine, includes the steps of determining an engine deceleration event, determining the number of engine revolutions required for the engine speed to decrease from one speed threshold to another speed threshold, comparing the number of engine revolutions determined above against a revolution threshold, and making the fuel and air mixture richer if the number of engine revolutions determined above is greater than the revolution threshold. The method may also include determining if, before the engine stabilized at a stable engine speed (which may be an engine idle speed), the engine speed decreased below the stable engine speed as the engine decelerated to the stable engine speed from a speed above the stable engine speed, and making the fuel and air mixture leaner if the determination is affirmative.
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公开(公告)号：US10473042B2
公开(公告)日：2019-11-12
申请号：US15743857
申请日：2016-07-22
Applicant: WALBRO LLC
Inventor： Takashi Abei , Martin N. Andersson , Cyrus M. Healy
Abstract: At least some implementations of a method of distinguishing between two loads being driven by an engine, includes the steps of determining engine speed at defined intervals, comparing a second engine speed against a previously determined first engine speed, determining if the second engine speed fits an expected pattern of engine speeds, and counting either the number of incidents where the second engine speed does not fit the expected pattern, or the number of incidents where the second engine speed does fit the expected pattern, or some combination of these two. A method of determining if an engine is operating at least near a lean limit of its air to fuel ratio is also disclosed.
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公开(公告)号：US20180328333A1
公开(公告)日：2018-11-15
申请号：US16045803
申请日：2018-07-26
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy
CPC classification number: F02P3/04 , F02P1/086 , F02P3/0807 , F02P5/1502
Abstract: An ignition system for a light-duty combustion engine includes a charge winding, a microcontroller and a power supply sub-circuit. The sub-circuit is coupled to both the charge winding and the microcontroller and includes a first power supply switch, a power supply capacitor and a power supply zener. The sub-circuit is arranged to turn off the first power supply switch so that charging of the power supply capacitor stops when the charge on the power supply capacitor exceeds the breakdown voltage on the power supply zener. In at least some implementations, the power supply capacitor may power the microcontroller and the power supply sub-circuit may limit or reduce the amount of electrical energy taken from the induced AC voltage of the charge winding to a level that is still able to sufficiently power the microcontroller yet saves energy for use elsewhere in the system.
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公开(公告)号：US10066592B2
公开(公告)日：2018-09-04
申请号：US14786256
申请日：2014-05-02
Applicant: Walbro LLC
Inventor： Martin N. Andersson , Cyrus M. Healy
Abstract: In at least some implementations, an ignition system for a light-duty combustion engine includes a charge winding, a microcontroller and a power supply sub-circuit. The sub-circuit is coupled to both the charge winding and the microcontroller and includes a first power supply switch, a power supply capacitor and a power supply zener. The sub-circuit is arranged to turn off the first power supply switch so that charging of the power supply capacitor stops when the charge on the power supply capacitor exceeds the breakdown voltage on the power supply zener. In at least some implementations, the power supply capacitor may power the microcontroller and the power supply sub-circuit may limit or reduce the amount of electrical energy taken from the induced AC voltage of the charge winding to a level that is still able to sufficiently power the microcontroller yet saves energy for use elsewhere in the system.
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公开(公告)号：US20240100549A1
公开(公告)日：2024-03-28
申请号：US18373820
申请日：2023-09-27
Applicant: Walbro LLC
Inventor： Bradley J. Roche , Eric G. Zbytowski , Cyrus M. Healy , Benjermen L. Hill , Elizabeth M. VanSipe
CPC classification number: B05B7/0408 , B01F25/1051 , B08B3/026 , B08B13/00 , B01F2101/4505 , B08B2203/0217
Abstract: A mixing system for a power washer includes an electrically actuated valve communicated with a supply of a working fluid, and having a valve head that is movable between open and closed positions to control the flow rate of the working fluid through an outlet of the valve. The outlet of the valve is communicated with a fluid passage of the power washer to enable flow of the working fluid into a primary fluid and discharge of a mixture of the primary fluid and working fluid from the power washer when the valve is open, and to provide a flow of primary fluid from the power washer when the valve is closed.
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