介绍一种用于测量内燃机耗油的流量计,以实现对动力机械的燃油控制,达到节能减排的目的.采用椭圆齿轮的测量形式,开发了二次仪表.利用一台喷油泵试验台进行了系统性能验证实验,根据内燃机的实际工作状况,在内燃机三种工况下进行了实验,即最大扭矩转速、最大功率转速以及起动转速.实验结果表明,该测量系统工作稳定,在最大扭矩转速和最大功率转速下测量误差相对小,分别为0.9％和0.8％,但在起动转速工况下误差大,为32.3％.同时,进油管和回油管的表头均有一定的内泄漏,且随着内燃机转速的增大而减小.最后,通过分析测量数据,提出了从表头工艺参数和软件补偿两个方面提高测量精度.%A flowmeter specifically designed to measure fuel consumption of an internal combustion engine was introduced. According to features of the combustion engine, two elliptical gear sensors respectively connected to the inlet and outlet tubes of the engine were employed. Meanwhile, the secondary instrument was developed to display the measuring results. An injection pump test bench and a pump were used in the experiment to verify the effectiveness of the designed system. The experiments were tested in three working conditions of the engine including maximum power,maximum torque,and starting speed,and each condition in the experiment was repeated three times in order to get reliable data. The experimental results show that the flowmeter can work in a stable way, and the relative errors are 0. 8% in the working condition of maximum power,0. 9% in the maximum torque, and 32. 3% at the starting speed separately. However, both the two sensors have internal leakage to some degree, and the leakage decreases with increasing the speed of the pump. Finally, the experimental data helps to improve the measurement accuracy of the system in the following two aspects: designing suitable parameters of sensors including suitable end and tip clearance, and the size of measuring room which should match the engine's power correctly; compensating the error with software, this method is simple but a lot of experiments should be done to get accurately fitted compensation curve.
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