The effects of engine thermal conditions on performance, emissions and fuel consumption

Research output: Contribution to conferencePaper

  • 7 Citations

Abstract

Engine thermal management systems (TMS) are gaining importance in engine development and calibration to achieve low fuel consumption and meet future emissions standards. To benefit from their full potential, a thorough understanding of the effects on engine behavior is necessary. Steady state tests were performed on a 2.0L direct injection diesel engine at different load points. A design of experiments (DoE) approach was used to conduct exhaust gas recirculation (EGR) and injection timing swings at different coolant temperatures. The effect of the standard engine controller and calibration was observed during these tests. The injection timing strategy included a significant dependency on coolant temperature, retarding injection by about 3°crank angle between coolant temperatures of 70°C and 86°C. In contrast, EGR strategy was essentially independent of coolant temperature, though physical interactions were present due in part to the EGR cooler. Of the three mechanisms investigated, EGR had the largest effect on Nitrous oxides (NO ) and fuel consumption and also had the largest potential for NO reduction over the stable engine operating range. Despite this, a reduction in coolant temperature from 86°C to 50°C reduced NO by 4.5% at high load condition. However, coolant temperature adjustments offer similar or better trade-offs than the other calibration parameters. For example, coolant temperature offers 10% improvement NO per percentage increase in fuel consumption, compared to 4% for injection timing and 13% for EGR. Higher coolant temperatures reduce ignition delay and premix burn during combustion, but this effect is more pronounced at lower engine loads. Analysis of mean effective pressures (MEP) showed friction MEP (FMEP) and pumping MEP (PMEP) reduce with higher operating temperatures, which yielded lower gross indicated MEP (IMEP). FMEP was slightly higher at higher load, with a 1.5% to 5.4% increase depending on operating temperature. This increase was expected to be due to the increased loading between parts within the engine, but would be offset by potentially higher local oil temperatures.

Conference

ConferenceSAE 2010 World Congress and Exhibition
CountryUK United Kingdom
CityDetroit, MI
Period13/04/1013/04/10

Fingerprint

Fuel consumption
Coolants
Engines
Exhaust gas recirculation
Temperature
Oxides
Calibration
Hot Temperature
Friction
Direct injection
Temperature control
Design of experiments
Ignition
Diesel engines
Controllers

Cite this

Burke, R., & Brace, C. (2010). The effects of engine thermal conditions on performance, emissions and fuel consumption. Paper presented at SAE 2010 World Congress and Exhibition, Detroit, MI, UK United Kingdom.DOI: 10.4271/2010-01-0802

The effects of engine thermal conditions on performance, emissions and fuel consumption. / Burke, R.; Brace, C.

2010. Paper presented at SAE 2010 World Congress and Exhibition, Detroit, MI, UK United Kingdom.

Research output: Contribution to conferencePaper

Burke, R & Brace, C 2010, 'The effects of engine thermal conditions on performance, emissions and fuel consumption' Paper presented at SAE 2010 World Congress and Exhibition, Detroit, MI, UK United Kingdom, 13/04/10 - 13/04/10, . DOI: 10.4271/2010-01-0802
Burke R, Brace C. The effects of engine thermal conditions on performance, emissions and fuel consumption. 2010. Paper presented at SAE 2010 World Congress and Exhibition, Detroit, MI, UK United Kingdom. Available from, DOI: 10.4271/2010-01-0802
Burke, R. ; Brace, C./ The effects of engine thermal conditions on performance, emissions and fuel consumption. Paper presented at SAE 2010 World Congress and Exhibition, Detroit, MI, UK United Kingdom.
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abstract = "Engine thermal management systems (TMS) are gaining importance in engine development and calibration to achieve low fuel consumption and meet future emissions standards. To benefit from their full potential, a thorough understanding of the effects on engine behavior is necessary. Steady state tests were performed on a 2.0L direct injection diesel engine at different load points. A design of experiments (DoE) approach was used to conduct exhaust gas recirculation (EGR) and injection timing swings at different coolant temperatures. The effect of the standard engine controller and calibration was observed during these tests. The injection timing strategy included a significant dependency on coolant temperature, retarding injection by about 3°crank angle between coolant temperatures of 70°C and 86°C. In contrast, EGR strategy was essentially independent of coolant temperature, though physical interactions were present due in part to the EGR cooler. Of the three mechanisms investigated, EGR had the largest effect on Nitrous oxides (NO ) and fuel consumption and also had the largest potential for NO reduction over the stable engine operating range. Despite this, a reduction in coolant temperature from 86°C to 50°C reduced NO by 4.5{\%} at high load condition. However, coolant temperature adjustments offer similar or better trade-offs than the other calibration parameters. For example, coolant temperature offers 10{\%} improvement NO per percentage increase in fuel consumption, compared to 4{\%} for injection timing and 13{\%} for EGR. Higher coolant temperatures reduce ignition delay and premix burn during combustion, but this effect is more pronounced at lower engine loads. Analysis of mean effective pressures (MEP) showed friction MEP (FMEP) and pumping MEP (PMEP) reduce with higher operating temperatures, which yielded lower gross indicated MEP (IMEP). FMEP was slightly higher at higher load, with a 1.5{\%} to 5.4{\%} increase depending on operating temperature. This increase was expected to be due to the increased loading between parts within the engine, but would be offset by potentially higher local oil temperatures.",
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