Fig. 1. The photograph of the exhaust layout installation in engine test bench
Fig. 2. Schematic diagram of Urea-SCR system in engine bench test
Fig. 3. The photograph of the canning zeolite based Cu-ZSM-5 catalysts and Cu-CHA catalysts
Fig. 4. The schematic diagram showing how the NH3/NOx ratio is controlled by modulating the urea injection duration
Fig. 5. The sample experiment and curve fit used to determine the NH3/NOx ratio with respect to injection duration which is used to predetermine the injection quantity
Fig. 6. Variation of (a) NOx concentration and (b) NOx reduction rate for LT-catalyst and HTcatalyst for the Urea-SCR system in Dual-Loop EGR CRDI engine. The operating conditions were as follows: engine speed was 1,500rpm, bmep was 4bars, and the coolant temperature was 85±2°C
Fig. 7. Variation of (a) NOx concentration and (b) NOx reduction rate for LT-catalyst and HTcatalyst for the Urea-SCR system in Dual-Loop EGR CRDI engine. The operating conditions were as follows: engine speed was 1,500rpm, bmep was 8bars, and the coolant temperature was 85±2°C
Fig. 8. Variation of (a) NOx concentration and (b) NOx reduction rate for LT-catalyst and HTcatalyst for the Urea-SCR system in Dual-Loop EGR CRDI engine. The operating conditions were as follows: engine speed was 2,000rpm, bmep was 4 bars, and the coolant temperature was 85±2°C
Fig. 9. Variation of (a) NOx concentration and (b) NOx reduction rate for LT-catalyst and HTcatalyst for the Urea-SCR system in Dual-Loop EGR CRDI engine. The operating conditions were as follows: engine speed was 2,000rpm, bmep was 8bars, and the coolant temperature was 85±2°C
Table 1. Specification of the 2.2l Common Rail Direct Injection(CRDI) engine
Table 2. Specification of catalysts
Table 3. Specifications of the eddy current dynamometer
Table 4. The experimental condition
Table 5. Specifications of the urea aqueous solution
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