CNG公交客车燃料消耗量计算方法

闫晟煜; 肖润谋; 李腾飞; 邓群

CNG公交客车燃料消耗量计算方法

1.
长安大学汽车学院, 陕西西安 710064
2.
四川交通职业技术学院汽车工程系, 四川成都 611130
3.
一汽大众汽车有限公司, 吉林长春 130013

基金项目:

国家自然科学基金项目 21607014

中央高校基本科研业务费专项资金项目 310822161011

详细信息

作者简介:
闫晟煜(1987-), 男, 黑龙江绥化人, 长安大学讲师, 工学博士, 从事客车性能测试研究

中图分类号: U471.23
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出版历程
- 收稿日期: 2017-08-11
- 刊出日期: 2017-12-25

Calculation method of fuel consumption on CNG bus

1.
School of Automobile, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Department of Automotive Engineering, Sichuan Vocational and Technology College of Communications, Chengdu 611130, Sichuan, China
3.
Faw-Volkswagen Automobile Co., Ltd., Changchun 130013, Jilin, China

More Information

Author Bio:
YAN Sheng-yu(1987-), male, lecturer, PhD, leo9574@163.com

摘要

摘要: 分析了CNG公交客车的燃料消耗量测试参数, 确定了流量计的安装位置; 基于安装位置的固定气压范围, 考虑到驾驶节能技术水平与乘坐人数的影响, 提出了CNG质量流量的计算方法; 通过场地测试, 验证了CNG质量流量与燃料温度、燃料压力之间的非线性关系, 以及与环境温度、气瓶出口端压力的关系; 通过运营测试, 分析了CNG质量流量修正前后的差异, 并验证了测试方案的可行性。研究结果表明: 受测试气压的限制, 流量计唯一的串接位置是减压阀的出口端与低压燃气滤清器之间, CNG经过减压阀后的出口压力基本稳定在0.80~0.95 MPa之间; 在运营测试结果修正中, 驾驶节能技术的影响最大, 最大偏差可达4%, 受测公交线路的驾驶节能技术水平有87.6%的相对值介于0.9~1.1, 离散度较低; 当环境温度升速为4.0~4.3℃·h^-1时, 燃料温度的变化速度基本波动于±0.61℃·h^-1之间, 证明了燃料温度对环境温度的变化不敏感; 气瓶出口端压力与燃料压力没有必然联系, 其数值的减小不会影响CNG质量流量的变化; 在0.80~0.95 MPa的燃料压力下, 测试位置的CNG当量密度基本稳定在6.1kg·m^-3, 连续测试30km后, CNG质量流量计算值与实测值误差小于5%;经对CNG质量流量修正后, 3辆测试车CNG质量流量的变化幅度分别为1.88%、-4.04%和1.71%, 因此, 采用CNG质量流量计算CNG消耗量更为精确。
- 汽车工程 /
- CNG公交客车 /
- CNG流量计 /
- 燃料消耗量 /
- 影响参数 /
- 计算方法修正
Abstract: The test parameters of fuel consumption of CNG bus were analyzed, and the suitable installation location of CNG flowmeter was determinated.Based on a fixed pressure range of CNG at installation location, the influence of driving energy saving technology level and passenger number was considered, and a calculation method of CNG mass flow was put forward.Field test was carried out to verify the nonlinear relationship among the mass flow, temperature and pressure of CNG, in addition, the relationship among the mass flow, the ambient temperature and the outlet pressure of cylinder.Based on the operational test, the difference of CNG mass flows before and after correction was analyzed, and the feasibility of testing method was verified.Research result shows that because of the limit of tested CNG pressure, the unique position ofCNG flowmeter is fixed between the outlet of pressure reducing valve and hypobaric gas filter, and CNG pressure decompresses to 0.80-0.95 MPa by pressure reducing valve.In the process of modifying operation test result, the driving energy saving technology level has greatest impact on the final test result of CNG mass flow, and the maximum tolerance may reach 4%.87.6% of the relative values for the driving factor are between 0.9 and 1.1, which reflects lower dispersion.When the rising speed of ambient temperature is between 4.0 ℃ ·h^-1 and 4.3 ℃ ·h^-1, the variance ratio of CNG temperature ranges from-0.61 ℃·h^-1 to 0.61 ℃·h^-1, which verifies that the CNG temperature is insensitive to the ambient temperature.Precisely speaking, there is no necessary connection between CNG pressure and cylinder outlet pressure, and the decrease of cylinder outlet pressure does not interfere with CNG mass flow.Under the CNG pressure of0.80-0.95 MPa, the CNG equivalent density at the testing position is stable at 6.1 kg·m^-3.After continuous testing about 30 km, the deviations are less than 5% between the test result and computation result of CNG mass flow.After modifying CNG mass flow, the variations of CNG mass flows of 3 buses are 1.88%, -4.04% and 1.71%, respectively, so CNG mass flow can be used to accurately compute CNG consumption.
- vehicle engineering /
- CNG bus /
- CNG flowmeter /
- fuel consumption /
- influencing parameters /
- modified calculation method

HTML全文

图 1 测试车辆

Figure 1. Test bus

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图 2 CNG流量计

Figure 2. CNG flowmeter

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图 3 CNG流量计串接位置

Figure 3. Concatenated position of CNG flowmeter

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图 4 L_j的相对效果

Figure 4. Relative effect of L_j

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图 5 场地测试方案

Figure 5. Planning of test field

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图 6 CNG压力与温度

Figure 6. CNG pressures and temperatures

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图 7 CNG温度和环境温度

Figure 7. CNG temperatures and environment temperatures

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图 8 气瓶出口端压力与CNG压力

Figure 8. Cylinder's outlet pressures and CNG pressures

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图 9 CNG质量流量

Figure 9. CNG mass flows

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图 10 CNG实耗体积

Figure 10. CNG consumption volumes

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表 1 CNG流量计参数

Table 1. Parameters of CNG flowmeter

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表 2 测试车辆的CNG实耗水平

Table 2. CNG consumption levels of test buses

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表 3 线路运营参数

Table 3. Operating parameters of line

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表 4 CNG参数

Table 4. CNG parameters

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表 5 修正因子计算结果

Table 5. Calculation results of modified factors

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