| 摘要 |
A method for controlling combustion in plasma ignition engine is provided. The method includes receiving a signal indicative of a cylinder pressure, determining a location of predefined MBF and COV of IMEP based on the cylinder pressure, and comparing the determined location of predefined MBF with a target location of predefined MBF and the determined COV of IMEP with a target COV of IMEP. When the determined location of predefined MBF has note reached the target location of predefined MBF and the determined COV of IMEP is not less than the target COV of IMEP, the method includes steps to either vary characteristics, such as number of pulses, input voltage, distance between two subsequent pulses, of a plasma shock wave or advance a plasma spark timing. The plasma shock wave is of an order of nanometer. |
| 主权项 |
1. A method for controlling combustion in a plasma ignition engine, the method comprising:
receiving, from a sensing unit, a signal indicative of a cylinder pressure, the sensing unit being disposed in the plasma ignition engine; determining, by a control unit, a location of predefined mass burnt fraction (MBF) and co-efficient of variance (COV) of indicated mean effective pressure (IMEP) based on the cylinder pressure; comparing, by the control unit, the determined location of predefined MBF with a target location of predefined MBF and the determined COV of IMEP with a target COV of IMEP; determining whether number of pulses in a plasma shock wave is greater than a threshold number of pulses, when the determined location of predefined MBF has not reached the target location of predefined MBF and the determined COV of IMEP is not less than the target COV of IMEP, wherein the plasma shock wave is of an order of nanometer; receiving, from the sensing unit, the cylinder pressure of a subsequent operation cycle, when the determined location of predefined MBF has reached the target location of predefined MBF and the determined COV of IMEP is less than the target COV of IMEP; determining whether an input voltage associated with the plasma shock wave is greater than a predefined minimum voltage, when the number of pulses in the plasma shock wave is greater than the threshold number of pulses; increasing the number of pulses in the plasma shock wave, when the number of pulses is less than the threshold number of pulses, to determine whether the location of predefined MBF has reached the target location of predefined MBF and the COV of IMEP is less than the target COV of IMEP; determining whether a distance between two subsequent pulses is less than a predefined minimum distance, when the input voltage associated with the plasma shock wave is greater than the predefined minimum voltage; increasing the input voltage associated with the plasma shock wave, when the input voltage is less than the predefined minimum voltage, to determine whether the location of predefined MBF has reached the target location of predefined MBF and the COV of IMEP is less than the target COV of IMEP; determining whether a plasma spark time is greater than a predefined maximum plasma spark time, when the distance between two subsequent pulses is less than the predefined minimum distance; reducing the distance between two subsequent pulses until the distance has reached the predefined minimum distance, when the distance between two subsequent pulses is not less than the predefined minimum distance, to determine whether the location of predefined MBF has reached the target location of predefined MBF and the COV of IMEP is less than the target COV of IMEP; and advancing the plasma spark time until the plasma spark time has reached the predefined maximum plasma spark time, to determine whether the location of predefined MBF has reached the target location of predefined MBF and the COV of IMEP is less than the target COV of IMEP, when the plasma spark time is not greater than the predefined maximum plasma spark time. |
