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公开(公告)号：US20190120156A1
公开(公告)日：2019-04-25
申请号：US16092791
申请日：2017-02-22
发明人： Vincent Dian , Matthias Scheid
CPC分类号： F02D41/2096 , F02D41/2467 , F02D2041/2051 , F02D2041/2055 , F02M51/0603
摘要： Various embodiments include a method for operating an internal combustion engine with a fuel injection system including a piezo actuator comprising: stopping the discharge phase of the actuator during an injection cycle; measuring a voltage profile at the actuator; comparing a feedback signal at the actuator with a setpoint value; varying the discharge time of the actuator in successive injection cycles until the feedback signal corresponds to the setpoint value; defining a servo valve closing time as a defined offset with respect to the optimized discharge time; and using the defined servo valve closing time to set an injection quantity of fuel for future injection cycles.
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公开(公告)号：US10746120B2
公开(公告)日：2020-08-18
申请号：US16094273
申请日：2017-03-09
发明人： Vincent Dian , Matthias Scheid
摘要： Various embodiments may include a method for operating a diesel-common-rail piezo-operated servo injector comprising: partially charging the piezo-actuator from a non-charged state at 0 V (method a); partially discharging the piezo-actuator from an already charged state to a remaining limited charge (method b); measuring the piezo-voltage with both methods and comparing the results; when the comparison demonstrates correspondence within a predefined threshold, using method b in ranges in which method a cannot be carried out; and when the comparison does not demonstrate correspondence within the predefined threshold, using method a without using method b.
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公开(公告)号：US20190128201A1
公开(公告)日：2019-05-02
申请号：US16094273
申请日：2017-03-09
发明人： Vincent Dian , Matthias Scheid
CPC分类号： F02D41/2096 , F02D41/2467 , F02D41/3827 , F02D2041/2051 , F02D2041/389 , F02M51/0603 , F02M57/005 , F02M63/023 , F02M2200/21
摘要： Various embodiments may include a method for operating a diesel-common-rail piezo-operated servo injector comprising: partially charging the piezo-actuator from a non-charged state at 0 V (method a); partially discharging the piezo-actuator from an already charged state to a remaining limited charge (method b); measuring the piezo-voltage with both methods and comparing the results; when the comparison demonstrates correspondence within a predefined threshold, using method b in ranges in which method a cannot be carried out; and when the comparison does not demonstrate correspondence within the predefined threshold, using method a without using method b.
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公开(公告)号：US10557432B2
公开(公告)日：2020-02-11
申请号：US16092791
申请日：2017-02-22
发明人： Vincent Dian , Matthias Scheid
摘要： Various embodiments include a method for operating an internal combustion engine with a fuel injection system including a piezo actuator comprising: stopping the discharge phase of the actuator during an injection cycle; measuring a voltage profile at the actuator; comparing a feedback signal at the actuator with a setpoint value; varying the discharge time of the actuator in successive injection cycles until the feedback signal corresponds to the setpoint value; defining a servo valve closing time as a defined offset with respect to the optimized discharge time; and using the defined servo valve closing time to set an injection quantity of fuel for future injection cycles.
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公开(公告)号：US09856813B2
公开(公告)日：2018-01-02
申请号：US15038563
申请日：2014-09-30
发明人： Vincent Dian
CPC分类号： F02D41/2096 , F02D41/2467 , F02D2041/2055 , F02D2200/0618 , F02M51/0603 , F02M63/0026
摘要： A method for determining the opening for piezo servo-driven injectors may include measuring a voltage and a charge at an end of a charging process of the piezo actuator; determining a provisional scaling factor by calculating Q/U; determining the maximum of CVORL and using the instant at which the maximum occurs as an approximation value of the valve opening instant; measuring the charge and voltage at the approximation of the valve opening instant; solving the equation: 1.25×F2/E×C=(U×C−Q)2 Where F=force acting on the piezo actuator, E=electrical parameter of the piezo actuator; determining a new scaling factor from the solution of the equation; calculating the difference (U×C−Q) and determining a maximum of said value; and using the instant at which said maximum occurs as valve opening instant.
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