Patents by Inventor Yaang Zhao
Yaang Zhao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11572664Abstract: An asphalt density estimation system includes a measurement device configured to output a measurement signal; a time synchronization unit configured to sample the measurement signal to obtain a sampled measurement signal and identify periodic sampling points of the sampled measurement signal across a plurality of periods. The system also includes a time synchronous averaging unit configured to construct a modified measurement signal in the time domain by: for at least one sampling point within the period, averaging a plurality of the periodic sampling points across periods to obtain an average periodic data point for the at least one sampling point, and constructing the modified measurement signal using the average periodic data point for the at least one sampling point. The system further includes a density calculation unit configured to determine asphalt density values based on the modified measurement signal; and a display unit configured to display the determined asphalt density values.Type: GrantFiled: March 21, 2018Date of Patent: February 7, 2023Assignee: VOLVO CONSTRUCTION EQUIPMENT ABInventor: Yaang Zhao
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Publication number: 20210363706Abstract: An asphalt density estimation system includes a measurement device configured to output a measurement signal; a time synchronization unit configured to sample the measurement signal to obtain a sampled measurement signal and identify periodic sampling points of the sampled measurement signal across a plurality of periods. The system also includes a time synchronous averaging unit configured to construct a modified measurement signal in the time domain by: for at least one sampling point within the period, averaging a plurality of the periodic sampling points across periods to obtain an average periodic data point for the at least one sampling point, and constructing the modified measurement signal using the average periodic data point for the at least one sampling point. The system further includes a density calculation unit configured to determine asphalt density values based on the modified measurement signal; and a display unit configured to display the determined asphalt density values.Type: ApplicationFiled: March 21, 2018Publication date: November 25, 2021Applicant: VOLVO CONSTRUCTION EQUIPMENT ABInventor: Yaang ZHAO
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Patent number: 10985681Abstract: The present invention relates to a generator control system that includes a generator, a variable displacement pump, a generator speed sensor, and a generator speed controller. The generator speed sensor generates a measurement output signal that corresponds to the speed of the generator. The generator speed controller generates a control signal that controls the displacement of the displacement pump to limit generator speed surging. The generator speed controller applying default commanded event control gain values to the control signal when a commanded change in the load or speed of the engine or generator occurs, applying uncommantled event control gain values to the control signal in the absence of a commanded change in load or speed of the engine or gen erator, and reducing the uncommanded event control gain values as needed until the magnitude of generator speed surging is less than a threshold value or until a minimum uncommanded event control gain value threshold is reached.Type: GrantFiled: September 11, 2013Date of Patent: April 20, 2021Assignee: BLAW-KNOX CORPORATIONInventors: Yaang Zhao, Andrew Hidish
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Publication number: 20160204725Abstract: The present invention relates to a generator control system that includes a generator, a variable displacement pump, a generator speed sensor, and a generator speed controller. The generator speed sensor generates a measurement output signal that corresponds to the speed of the generator. The generator speed controller generates a control signal that controls the displacement of the displacement pump to limit generator speed surging. The generator speed controller applying default commanded event control gain values to the control signal when a commanded change in the load or speed of the engine or generator occurs, applying uncommantled event control gain values to the control signal in the absence of a commanded change in load or speed of the engine or gen erator, and reducing the uncommanded event control gain values as needed until the magnitude of generator speed surging is less than a threshold value or until a minimum uncommanded event control gain value threshold is reached.Type: ApplicationFiled: September 11, 2013Publication date: July 14, 2016Applicant: Volvo ConstructionEquipment ABInventors: Yaang ZHAO, Andrew HIDISH
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Patent number: 8571774Abstract: One disclosed embodiment relates to a propulsion system for a machine. The propulsion system may include a prime mover operatively connected through a continuously variable transmission to a propulsion device. The propulsion system may also include propulsion-system controls that control an operating parameter of the continuously variable transmission, which may include adjusting the operating parameter based on operator input. Controlling the operating parameter may also include determining an adjustment limit for the operating parameter based on one or more operating conditions and applying the adjustment limit to the operating parameter to modify at least one of acceleration and jerk of the machine based on the one or more operating conditions.Type: GrantFiled: November 26, 2012Date of Patent: October 29, 2013Assignee: Caterpillar Inc.Inventors: Kristofor Lee Dahl, Brian Douglas Hoff, Richard George Ingram, Michael Anthony Spielman, Jr., Benjamin B. Schmuck, Alberto Martinez, Jr., Yaang Zhao
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Patent number: 8352138Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has a first operator input device configured to transmit a first displacement signal corresponding to a displacement of the first operator input device. The continuously variable transmission further has a second operator input device configured to transmit a second displacement signal corresponding to a displacement of the second operator input device. In addition, the continuously variable transmission has a third operator input device configured to transmit a transmission operating mode request. Furthermore, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission.Type: GrantFiled: November 30, 2007Date of Patent: January 8, 2013Assignee: Caterpillar Inc.Inventors: Kristofor Lee Dahl, Richard George Ingram, Michael Anthony Spielman, Jr., Alberto Martinez, Jr., Yaang Zhao, Ellen Jean Hoffman
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Patent number: 8321105Abstract: One disclosed embodiment relates to a propulsion system for a machine. The propulsion system may include a prime mover operatively connected through a continuously variable transmission to a propulsion device. The propulsion system may also include propulsion-system controls that control an operating parameter of the continuously variable transmission, which may include adjusting the operating parameter based on operator input. Controlling the operating parameter may also include determining an adjustment limit for the operating parameter based on one or more operating conditions and applying the adjustment limit to the operating parameter to modify at least one of acceleration and jerk of the machine based on the one or more operating conditions.Type: GrantFiled: October 31, 2007Date of Patent: November 27, 2012Assignee: Caterpillar Inc.Inventors: Kristofor Lee Dahl, Brian Douglas Hoff, Richard George Ingram, Michael Anthony Spielman, Jr., Benjamin B. Schmuck, Alberto Martinez, Jr., Yaang Zhao
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Patent number: 8216109Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has at least one operator input device configured to transmit a transmission operating mode request and at least one other operator input device configured to transmit a driven element output request. In addition, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission. The continuously variable transmission further has a controller configured to regulate an output of the driven element in response to the operating mode request, the driven element output request, and the at least one sensed parameter indicative of an operating condition of the transmission.Type: GrantFiled: September 28, 2007Date of Patent: July 10, 2012Assignee: Caterpillar Inc.Inventors: Kristofor Lee Dahl, Brian Douglas Hoff, Richard George Ingram, Michael Anthony Spielman, Jr., Benjamin B. Schmuck, Alberto Martinez, Jr., Yaang Zhao
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Publication number: 20090143948Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has a first operator input device configured to transmit a first displacement signal corresponding to a displacement of the first operator input device. The continuously variable transmission further has a second operator input device configured to transmit a second displacement signal corresponding to a displacement of the second operator input device. In addition, the continuously variable transmission has a third operator input device configured to transmit a transmission operating mode request. Furthermore, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission.Type: ApplicationFiled: November 30, 2007Publication date: June 4, 2009Inventors: Kristofor Lee Dahl, Richard George Ingram, Michael Anthony Spielman, JR., Alberto Martinez, JR., Yaang Zhao, Ellen Jean Hoffman
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Publication number: 20090112424Abstract: One disclosed embodiment relates to a propulsion system for a machine. The propulsion system may include a prime mover operatively connected through a continuously variable transmission to a propulsion device. The propulsion system may also include propulsion-system controls that control an operating parameter of the continuously variable transmission, which may include adjusting the operating parameter based on operator input. Controlling the operating parameter may also include determining an adjustment limit for the operating parameter based on one or more operating conditions and applying the adjustment limit to the operating parameter to modify at least one of acceleration and jerk of the machine based on the one or more operating conditions.Type: ApplicationFiled: October 31, 2007Publication date: April 30, 2009Inventors: Kristofor Lee Dahl, Brian Douglas Hoff, Richard George Ingram, Michael Anthony Spielman, JR., Benjamin B. Schmuck, Alberto Martinez, JR., Yaang Zhao
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Publication number: 20090088295Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has at least one operator input device configured to transmit a transmission operating mode request and at least one other operator input device configured to transmit a driven element output request. In addition, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission. The continuously variable transmission further has a controller configured to regulate an output of the driven element in response to the operating mode request, the driven element output request, and the at least one sensed parameter indicative of an operating condition of the transmission.Type: ApplicationFiled: September 28, 2007Publication date: April 2, 2009Inventors: Kristofor Lee Dahl, Brian Douglas Hoff, Richard George Ingram, Michael Anthony Spielman, JR., Benjamin B. Schmuck, Alberto Martinez, JR., Yaang Zhao
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Patent number: 6809501Abstract: A fuel economy control method includes estimating a temperature of a battery, measuring a current of the battery, and measuring a voltage of the battery. A nominal optimum charging voltage is determined as a function of a state of charge (SOC) of the battery and the estimated temperature. The nominal optimum charging voltage is reduced to a fuel economy minimum charging voltage if the SOC is above a predetermined level and the current is within a predetermined range.Type: GrantFiled: March 11, 2003Date of Patent: October 26, 2004Assignee: General Motors CorporationInventors: Nick S. Kapsokavathis, Yaang Zhao, David W. Walters
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Publication number: 20040189254Abstract: A fuel economy control method includes estimating a temperature of a battery, measuring a current of the battery, and measuring a voltage of the battery. A nominal optimum charging voltage is determined as a function of a state of charge (SOC) of the battery and the estimated temperature. The nominal optimum charging voltage is reduced to a fuel economy minimum charging voltage if the SOC is above a predetermined level and the current is within a predetermined range.Type: ApplicationFiled: March 11, 2003Publication date: September 30, 2004Inventors: Nick S. Kapsokavathis, Yaang Zhao, David W. Walters