增压稀燃天然气掺氢发动机稳态标定

以东风EQD210N—20天然气发动机为原型机,在燃用体积掺氢比为20%的HCNG燃料的条件下,根据某公司电控系统的相关资料,分析了电控系统内部的控制策略,结合HCNG燃料自身的特点,对HCNG发动机进行稳态工况标定。外特性和其他工况采用不同的空燃比控制策略以使标定后的电控系统可以同样适用于HC-NG发动机,并且标定后的HCNG发动机满足国Ⅲ排放标准,其动力性和经济性与原型机水平相当。

Steady Condition Calibration of Turbocharged Lean Burn HCNG Engine

Taking EQD210N—20 CNG prototype engine as an example, the internal control strategy of electronic control system was analyzed by referring to ECU relative materials of a certain company under the condition of burning the HCNG whose hydrogen volume fraction was 20 percent. Then ECU was calibrated under steady conditions combining with the characteristic of HCNG. The control strategy of different air-fuel ratios was used to calibrate the electronic control system under full load speed characteristic and other conditions. Finally, the calibrated HCNG engine could arrive to China Ⅲ stage emission standard and its power performance and fuel economy were equivalent to those of CNG prototype engine.