Investigation of Robustness Control for Practical Use of Gasoline HCCI Engine Hitachi,Ltd

Format:

Conference/Event

Author/Creator:

Ogata, Ogata, author.

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

The purpose of this study was to develop a method for detectingcombustion fluctuation and noise to improve homogeneous chargecompression ignition (HCCI) engine system robustness.In the present study, the maximum rate of pressure rise(dp/dθmax) was used as an indexof noise and the standard deviation of indicated mean effectivepressure (σIMEP) was used as an index of HCCI combustionfluctuation. A knock sensor and crank angle sensor, which areequipped with a conventional spark ignition (SI) engine system,were used as combustion noise and fluctuation detection sensors.For acquiring knock sensor signals, the time series of data wereanalyzed using fast Fourier transformation (FFT). The integralvalue of the power spectrum shows the vibration intensity of theengine. For acquiring crank angle sensor signals, the time seriesof data were analyzed using the average calculation of crankshaftrevolution.As a result of having performed a basic simulation, thefrequency range was preferably set to between 5 - 7 kHz because thecombustion temperature of HCCI was lower than that of SIcombustion. The beginning of rotational fluctuation detection waspreferably set to 20 deg. ATDC CA and the ending period was set to180 deg. ATDC CA.A prototype control logic, which was incorporated into theanalysis results mentioned above was validated on a test bench. Asdp/dθmax increased by increasingthe period of the negative valve overlap and the period ofinjection, the vibration intensity increased. Likewise, as σIMEPincreased by decreasing the period of the negative valve overlap,the rotational fluctuation increased. The coefficient ofdetermination of the detection parameters for noise and fluctuationindices was higher than 0.9. Therefore, the following detectionmethods were used to estimate the noise and fluctuation levels ofHCCI combustion. Feedback control based on these methods wasconducted on a test bench. As a result, the stability of HCCIcombustion was improved

Notes:

Vendor supplied data

Publisher Number:

2013-01-0323

Access Restriction:

Restricted for use by site license