Patents by Inventor Guoming G. Zhu

Guoming G. Zhu 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).

  • Patent number: 7021287
    Abstract: The individual cylinder air to fuel ratio of an internal combustion engine varies due to the fact that the intake manifold cannot distribute airflow into the individual cylinders evenly. This feature of the present invention utilizes minimum timing for best torque MBT timing criterion provided by the ionization signals or by the in-cylinder pressure signals to balance the air to fuel ratios of the individual cylinders. The control method of the present invention comprises: calculating a mean timing coefficient, calculating a timing coefficient error, integrating the minimum timing for best torque timing coefficient error, calculating a raw fuel trim coefficient, resealing the raw fuel trim coefficient, updating a feedforward look-up table based upon the current engine operating conditions, and calculating a final fueling command.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: April 4, 2006
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Chao F. Daniels
  • Patent number: 7013871
    Abstract: This feature of the present invention comprises a closed loop which uses estimated MBT timing criteria and ignition diagnostics (knock, partial-burn, and misfire) to control engine ignition. When the engine is not knock limited, it operates at its MBT timing. When the engine is knock limited, the engine runs at its inaudible knock limit. When the engine is misfire/partial-burn limited, the engine is maintained at its misfire/partial-burn limit. Three different embodiments of the closed loop MBT timing control architecture are disclosed: a cylinder-by-cylinder control, an average control and a mixed control.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: March 21, 2006
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Chao F. Daniels
  • Patent number: 7005855
    Abstract: The present invention is directed to a dual charge rate power supply circuit and method for ionization detection. The circuit includes a first diode, first and second capacitors, and first and second current paths. The first diode includes an anode operably connected to a first end of a primary winding. The first capacitor has a second end operably connected to ground and the second capacitor has a first end operably connected to the cathode of the first diode as well as a second end operably connected to ground. The first and second current paths are operably connected between the first and second capacitors and include a second diode, a parallel combination of a first resistor and a third diode, and a second resistor. The first diode is operably connected in parallel with the first capacitor.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: February 28, 2006
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Kevin D. Moran
  • Patent number: 6998846
    Abstract: The present feature of the invention is generally directed to a subsystem of an ignition diagnostics and feedback control system using ionization current feedback. It utilizes the ionization signal from an ionization detection circuit to monitor ignition parameters, such as primary charge timing, primary charge duration, ignition/spark timing, and ignition/spark duration for future “smart” ignition system control. In addition, the ionization signal is also used to detect spark plug carbon fouling, as well as plug insulator overheating. These parameters can be monitored for every cylinder of the engine for each engine cycle.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: February 14, 2006
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Chao F. Daniels, Guoming G. Zhu, Bruce Wang, Kenneth L. Gould
  • Patent number: 6980903
    Abstract: This feature of the present invention comprises a method and apparatus to reduce NOx emissions in an internal combustion engine. This feature of the present invention uses a closed loop control of the exhaust gas re-circulation to provide the engine with the either EGR MBT timing or a knock limited timing to yield the minimum NOx emission with maximum fuel economy benefits associated with exhaust gas re-circulation. When the exhaust gas re-circulation rate is not knock limited, the engine sets its exhaust gas re-circulation rate to an optimal rate at which the engine runs at the exhaust gas re-circulation minimum best time for best torque spark timing limit. When the exhaust gas re-circulation rate is knock limited, the engine sets its exhaust gas re-circulation rate to a knock limited rate at which the engine runs at a retarded MBT spark timing limit. The engine uses calibratable MBT timing criteria to determine the retarded MBT spark timing limit.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: December 27, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Chao F. Daniels, Guoming G. Zhu
  • Patent number: 6955157
    Abstract: The present invention provides a system and method for controlling the retard limit of an engine having one or more cylinders in which combustion occurs. A sensor is employed to detect the ionization of the combustion process in the cylinders. The ionization is related to a retard limit feedback, and the sensor further transmits a signal associated with the retard limit feedback. A controller relates the retard limit feedback signal to a metric, monitors the stochastic behavior of the metric, and adjusts the ignition timing of the engine in response to the stochastic behavior to operate the engine below a retard limit target.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: October 18, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Ibrahim Haskara, Guoming G. Zhu
  • Patent number: 6954074
    Abstract: A circuit for measuring ionization current in a combustion chamber of an internal combustion engine including an ignition coil, having a primary winding and a secondary winding, and an ignition plug. The ignition plug ignites an air/fuel mixture in the combustion chamber and produces an ignition current in response to ignition voltage from the ignition coil. A capacitor, charged by the ignition coil, provides a bias voltage producing an ionization current after ignition of the air/fuel mixture in the combustion chamber. A current mirror circuit produces an isolated current signal proportional to the ionization current. In the present invention, the ignition current and the ionization current flow in the same direction through the secondary winding of the ignition coil. The charged capacitor operates as a power source and, thus, the ignition current flows from the charged capacitor through the current mirror circuit and the ignition coil to the ignition plug.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: October 11, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Bruce Wang, Kenneth L. Gould
  • Patent number: 6951201
    Abstract: In a first preferred embodiment, the present feature of the invention multiplexes both the ionization and driver current feedback signals into one signal, thus reducing cost and making coil packaging easier. The multiplexed signal first outputs the ionization detection signal and then replaces the ionization signal with the charge current feedback signal when the charge command Vin is enabled. In other words, the multiplexed feedback signal outputs the ionization feedback signal and switches to the charge current feedback signal when the charge command Vin is active. In a second preferred embodiment, the present feature of the invention comprises a method and apparatus to multiplex the ignition driver gate signal with both the ignition coil charge current feedback signal and the ionization signal, thus reducing the package pin count by two.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: October 4, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Michael T. Nation, Bruce Wang, Kenneth L. Gould, Kevin D. Moran, Garlan J. Huberts
  • Patent number: 6945229
    Abstract: The present invention provides a system for controlling knock in an engine having one or more cylinders in which combustion occurs. The system includes a sensor that detects the ionization of the combustion process in the cylinders. The ionization is related to the knock intensity occurring in the cylinders, and the sensor further transmits a signal associated with the knock intensity. The system further includes a controller that monitors the stochastic behavior of the ionization signal and adjusts the ignition timing of the engine to operate the engine with an actual knock intensity that is below a knock borderline limit that defines a desired knock intensity.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: September 20, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Ibrahim Haskara
  • Patent number: 6922628
    Abstract: The present invention includes an engine diagnostic method and routine, wherein a method of using an ionization signal to perform an engine diagnostic routine includes the steps of detecting the ionization signal; integrating the ionization signal over a first sampling window to generate a first integration ionization value; detecting a peak of the ionization signal over said first sampling window to generate a first peak ionization value; integrating the ionization over a second sampling window to generate a second integration ionization value; detecting a peak of the ionization signal over a second sampling window to generate a second peak ionization value; and diagnosing the engine using said ionization signal.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: July 26, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Chao Daniels
  • Patent number: 6922057
    Abstract: A charge pump is used to supply current to the ionization detection circuit. To detect in-cylinder ions generated during the combustion process, a DC bias voltage needs to be applied. There are two ways to generate the DC bias: conventional DC power supply (large electronics) and capacitor charges by primary or secondary flyback voltage (high voltage capacitor). Typically, flyback voltage is used to charge the capacitor which supplies current to the ionization detection circuit. This necessitates the use of high voltage capacitors. Generally, ceramic capacitors are used. However, as temperature fluctuates, the board that the capacitor is mounted on can flex, causing the ceramic capacitor to crack. This invention proposes to use a high voltage charge pump to provide enough DC bias voltage for measuring ionization current. In a preferred embodiment, a model number M1C4827 EL driver is used in the charge pump circuit.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: July 26, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Guoming G. Zhu, Michael T. Nation, Bruce Wang, Kenneth L. Gould, Garlan J. Huberts, Kevin D. Moran
  • Patent number: 6883509
    Abstract: Internal combustion engine (ICE) on-plug ignition coils with transistor drivers located in powertrain control modules (PCM) or other remote locations are prone to high electrical and magnetic interference (EMI) emissions and are subject to interference from other components due to long connecting wires. Ionization detection circuits have even greater sensitivity to EMI because of their very low signal current levels (mioroampere). The present feature of the invention integrates both the coil driver transistor and ionization detection circuits into the on-plug ignition coil. By placing the circuit on top or on the side of the coil, the connection distance from the circuit to the secondary winding is minimized. Thus, the circuit is less susceptible to electrical and electromagnetic noise.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: April 26, 2005
    Assignee: Visteon Global Technologies, Inc.
    Inventors: David L. Porter, Garlan J. Huberts, Constantine Panagos, Guoming G. Zhu, Michael T. Nation, Bruce Wang, Kenneth L. Gould, Kevin D. Moran
  • Publication number: 20040084019
    Abstract: This feature of the present invention comprises a closed loop which uses estimated MBT timing criteria and ignition diagnostics (knock, partial-burn, and misfire) to control engine ignition. When the engine is not knock limited, it operates at its MBT timing. When the engine is knock limited, the engine runs at its inaudible knock limit. When the engine is misfire/partial-burn limited, the engine is maintained at its misfire/partial-burn limit. Three different embodiments of the closed loop MBT timing control architecture are disclosed: a cylinder-by-cylinder control, an average control and a mixed control.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Guoming G. Zhu, Chao F. Daniels
  • Publication number: 20040084020
    Abstract: This feature of the present invention is a robust multi-criteria minimum timing for the best torque (MBT) timing estimation method and apparatus utilizing different ionization signal waveforms that are generated under different engine operating conditions. This feature of the present invention determines and combines multiple MBT timing criteria to increase the reliability and robustness of MBT timing estimation based upon spark plug ionization signal waveforms. In a preferred embodiment, the present invention combines MBT timing estimation criteria comprising a maximum flame acceleration location, a 50% burn location, and a second peak location.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Chao F. Daniels, Guoming G. Zhu
  • Publication number: 20040084034
    Abstract: This feature of the present invention comprises two embodiments of an integrated ionization detection circuit and ignition coil driver according to the present invention, an ASIC and a single electronic package. The apparatuses reduce the cost and complexity of an in-cylinder ionization detection system by combining like functionality into one ASIC or electronic module easing packaging constraints. In both embodiments, a current sink is used. The current sink removes noise in the form of voltage spikes. The voltage spikes are high voltage, but of short duration. The current sink prevents these spikes from turning on the IGBT. However, the current sink allows the IGBT command signal to pass. This feature of the present invention also comprises a switch whereby ionization current and coil primary current are multiplexed.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Garlan J. Huberts, Michael T. Nation, Guoming G. Zhu, Kevin D. Moran, Bruce Wang, Kenneth L. Gould
  • Publication number: 20040084021
    Abstract: In a first preferred embodiment, the present feature of the invention multiplexes both the ionization and driver current feedback signals into one signal, thus reducing cost and making coil packaging easier. The multiplexed signal first outputs the ionization detection signal and then replaces the ionization signal with the charge current feedback signal when the charge command Vin is enabled. In other words, the multiplexed feedback signal outputs the ionization feedback signal and switches to the charge current feedback signal when the charge command Vin is active. In a second preferred embodiment, the present feature of the invention comprises a method and apparatus to multiplex the ignition driver gate signal with both the ignition coil charge current feedback signal and the ionization signal, thus reducing the package pin count by two.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Guoming G. Zhu, Michael T. Nation, Bruce Wang, Kenneth L. Gould, Kevin D. Moran, Garlan J. Huberts
  • Publication number: 20040083794
    Abstract: The present feature of the invention comprises a method and apparatus for determining cylinder ID. When a cylinder is compressed, the resistance increases across the spark plug gap. Thus, if a spark coil is only partially charged before activation of the spark, the air gap is not broken down and no ignition occurs in the cylinder in compression. The failure of a spark plug to spark is reflected in the ionization signal. In a preferred embodiment, the dwell time is selected so that the spark plug located in a cylinder that is not in compression will spark, while a spark plug in a cylinder that is in compression will not. The cylinder in compression will output an ionization signal with a shorter duration than a cylinder not in compression. In a preferred embodiment, two methods are used to calculate the duration of the spark, edge detection and integration.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Chao F. Daniels, Guoming G. Zhu, Mathew Breton, Michael T. Nation
  • Publication number: 20040084018
    Abstract: This feature of the present invention comprises an ignition diagnostics and feedback control system based upon detected ionization current in an individual cylinder. The system is divided into two subsystems: an ignition diagnostics subsystem and an ignition feedback control system subsystem. The ignition diagnostics subsystem comprises an ignition system diagnostics, a misfire detector, a knock detector, and a robust multi-criteria minimum timing for best torque MBT timing estimator. The ionization feedback control subsystem comprises five main subsystems: a closed loop cold start retard spark control using ionization feedback, a closed loop MBT timing control using ionization feedback, a closed-loop individual cylinder air to fuel ratio balancing control system, an optimal wide open throttle air/fuel ratio control, and an exhaust gas control using a spark plug ionization signal.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Guoming G. Zhu, Chao F. Daniels
  • Publication number: 20040088102
    Abstract: This feature of the present invention comprises a method and apparatus to reduce NOx emissions in an internal combustion engine. This feature of the present invention uses a closed loop control of the exhaust gas re-circulation to provide the engine with the either EGR MBT timing or a knock limited timing to yield the minimum NOx emission with maximum fuel economy benefits associated with exhaust gas re-circulation. When the exhaust gas re-circulation rate is not knock limited, the engine sets its exhaust gas re-circulation rate to an optimal rate at which the engine runs at the exhaust gas re-circulation minimum best time for best torque spark timing limit. When the exhaust gas re-circulation rate is knock limited, the engine sets its exhaust gas re-circulation rate to a knock limited rate at which the engine runs at a retarded MBT spark timing limit. The engine uses calibratable MBT timing criteria to determine the retarded MBT spark timing limit.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Chao F. Daniels, Guoming G. Zhu
  • Publication number: 20040085068
    Abstract: In this feature of the present invention a charge pump is used to supply current to the ionization detection circuit. To detect in-cylinder ions generated during the combustion process, a DC bias voltage needs to be applied. There are two ways to generate the DC bias: conventional DC power supply (large electronics) and capacitor charges by primary or secondary flyback voltage (high voltage capacitor). Typically, flyback voltage is used to charge the capacitor which supplies current to the ionization detection circuit. This necessitates the use of high voltage capacitors. Generally, ceramic capacitors are used. However, as temperature fluctuates, the board that the capacitor is mounted on can flex, causing the ceramic capacitor to crack. This invention proposes to use a high voltage charge pump to provide enough DC bias voltage for measuring ionization current. In a preferred embodiment, a model number MIC4827 EL driver is used in the charge pump circuit.
    Type: Application
    Filed: June 11, 2003
    Publication date: May 6, 2004
    Inventors: Guoming G. Zhu, Michael T. Nation, Bruce Wang, Kenneth L. Gould, Garlan J. Huberts, Kevin D. Moran