MBT Timing Detection and its Closed-Loop Control Using In-Cylinder Ionization Signal Visteon Corporation

Format:

Conference/Event

Author/Creator:

Zhu, Guoming G., author.

Conference Name:

2004 Powertrain & Fluid Systems Conference & Exhibition (2004-10-25 : Tampa, Florida, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2004

Summary:

Maximum Brake Torque (MBT) timing for an internal combustion engine is the minimum advance of spark timing for best torque. Traditionally, MBT timing is an open loop feedforward control whose values are experimentally determined by conducting spark sweeps at different speed, load points and at different environmental operating conditions. Almost every calibration point needs a spark sweep to see if the engine can be operated at the MBT timing condition. If not, a certain degree of safety margin is needed to avoid pre-ignition or knock during engine operation. Open-loop spark mapping usually requires a tremendous amount of effort and time to achieve a satisfactory calibration. This paper shows that MBT timing can be achieved by regulating a composite feedback measure derived from the in-cylinder ionization signal referenced to a top dead center crank angle position. A PI (proportional and integral) controller is used to illustrate closed-loop control of MBT timing. The test results show that the control, using the ionization current based feedback signal, not only maintains the engine average ignition timing at its MBT timing but also reduces the cycle-to-cycle variations

Notes:

Vendor supplied data

Publisher Number:

2004-01-2976

Access Restriction:

Restricted for use by site license