US 7,320,304 B2
Speed transient control methods for direct-injection engines with controlled auto-ignition combustion
Chen-Fang Chang, Troy, Mich. (US); Zongxuan Sun, Troy, Mich. (US); Jun-Mo Kang, Ann Arbor, Mich. (US); Tang-Wei Kuo, Troy, Mich. (US); James A. Eng, Troy, Mich. (US); Barry L. Brown, Lake Orion, Mich. (US); Paul M. Najt, Bloomfield Hills, Mich. (US); and Man-Feng Chang, Troy, Mich. (US)
Assigned to GM Global Technology OPerations, Inc., Detroit, Mich. (US)
Filed on Mar. 02, 2006, as Appl. No. 11/367,047.
Claims priority of provisional application 60/658290, filed on Mar. 03, 2005.
Prior Publication US 2006/0196468 A1, Sep. 07, 2006
Int. Cl. F02D 43/00 (2006.01)
U.S. Cl. 123—305  [123/436; 123/90.15; 123/568.14] 7 Claims
OG exemplary drawing
 
1. Method for control of a direct-injection engine operated with controlled auto-ignition during speed transient operations, the method comprising:
operating the engine at steady state, within a homogeneous charge compression-ignition (HCCI) load range, with fuel-air-diluent mixtures at predetermined conditions, for each speed and load, of fueling mass flow rate (fueling rate), injection timing (FI), spark timing (SI), throttle position, exhaust gas recirculation (EGR) valve setting, and exhaust recompression obtained by negative valve overlap (NVO) between closing of the exhaust valves and opening of the intake valves in each cylinder; and
controlling the engine during speed transients from a first steady state speed condition to a second steady state speed condition by synchronizing change rates of predetermined control inputs to the engine with the current engine speed change rate, the predetermined control inputs including at least three of FI, SI, throttle position, EGR valve setting and NVO.