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Improvements of Exhaust Gas Emissions and Cold Startability of Heavy Duty Diesel Engines by New Injection-Rate-Control Pump
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Abstract
In order to investigate the effects of high injection pressure on engine performance and exhaust emissions, some experimental high injection pressure in-line pumps were made and tested.
Increasing fuel spray momentum by high injection pressure could reduce smoke emission, but excessive increase in injection pressure was found not so effective in further reducing smoke emission.
Accordingly, a high injection pressure should be accomplished within the low engine speed range a feature that has been very difficult to achieve for a conventional in-line pump.
An electronic controlled injection-rate-control pump with a variable prestroke mechanism can provide higher injection pressure in low engine speed range and advances injection timing in high engine speed range. This pump can improve fuel economy in low engine speed range and emissions (smoke and particulate) over transient FTP for HDE's. This pump with prestroke control sleeve directly driven by a solenoid is capable of achieving timing advance without delay even at engine cold starting and hence is effective in improving cold start-ability.
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Citation
Ishida, A., Kanamoto, T., and Kurihara, S., "Improvements of Exhaust Gas Emissions and Cold Startability of Heavy Duty Diesel Engines by New Injection-Rate-Control Pump," SAE Technical Paper 861236, 1986, https://doi.org/10.4271/861236.Also In
References
- Nakagawa Hiroshi Tateishi Mataji Sekino Masaaki “Application of Fuel Spray Theory to Exhaust Emission Control in D.i. Diesel Engine.” SAE paper No. 760214 1976
- Burman Paul G. et al “Fuel Injection Systems for Internal Combustion Engines” 37 1962
- Wakuri Yutaro Fujii Masaru Amitani Tatuo Tsuneya Reijiro “Studies on the Penetration of Fuel Spray in a Diesel Engine,” Bulletin of JASME 13 9 1960
- Tosa Youzo Shimoda Kunihiko Nagae Sadanori “Transient response Characteristics of Turbocharged Diesel Engines For Vehicles” MITSUBISHI JUKO GIHO 16 2 1979
- Schwartz R. “High-Pressure Injection Pumps with Electronic Control for Heavy-Duty Diesel Engines” SAE paper 850170 1985