汽车额定功率参数的选择及测试-------外文翻译.doc
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汽车额定功率参数的选择及测试-------外文翻译,hyundai motor starters all the electricity used, the function of starter is quickly and reliably start the engine, so that the normal work of the engine. theref...
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Hyundai Motor starters all the electricity used, the function of starter is quickly and reliably start the engine, so that the normal work of the engine. Therefore, in the choice of engines, must be compatible with the identified good starter; Of course, must choose a good starter with the engine and the transmission ratio of the best fit of the battery charge level. In order to make the engine can be quickly and reliably, the starter must have sufficient power, otherwise it may not start the engine, or an increase in the number of repeat start, start-up time, the burning of starter, the fuel consumption of too many negative impact.1 starter choice of rated power parameters 1.1 engine starter drive minimum speed
Starter must be launched to make the engine work a minimum speed, the rated speed is the starter, and starter of the rated power P determined by the minimum start-up engine speed n_f (unit: r / min) and huge start-up resistance M_f (unit: Nm), that is: P ≥ (M_f × n_f) / 9549.3KW.The engine is determined, start the engine torque and minimum speed start-up will have been identified. In accordance with the conditions of vaporization of gasoline engines in the 0 ~ 20 degrees starting at the minimum speed is generally 35 r / min ~ 40 r / min, at a lower temperature in order to guarantee the start-up reliability and wear and tear to consider in order to in paragraph 1 times after detonation engine can work, generally take the lowest gasoline engine start-up speed for the 50r / min ~ 70 r / min; diesel engines rely on compression ignition, the minimum start-up speed is higher. Because the speed is low, as a result of compression time, heat dissipation, increased leakage, it will cause the end of compression stroke to
现代汽车全部采用电力起动机，起动机的功能就是迅速、可靠地起动发动机，使发动机正常工作。所以在选择发动机，必须确定好与之配套的起动机；当然还必须选择好起动机与发动机的最佳传动比及适配的蓄电池的电荷量等。为了使发动机能迅速、可靠地起，起动机必须具有足够的功率，否则就有可能起动不了发动机，或出现重复起动的次数增多，起动时间延长，烧毁起动机，消耗过多的燃料等不利的影响。
1.起动机额定功率参数的选择
1.1 起动机驱动发动机的最低工作转速。
起动机必须具有使发动机发动的最低工作转速，即为起动机的额定转速，而起动机的额定功率P决定于发动机的最低起动转速（单位：r/min）和起动阻力钜(单位：Nm),即：P≥(×)/9549.3KW。
发动机一经确定，发动机的启动阻力矩和最低起动转速也就已经确定。根据汽化条件，汽油发动机在0~20度时的最低起动转速一般为35 r/ min～40 r/ min ,为了在更低的温度下保证起动的可靠性及考虑各种损耗 ,以便在第 1 次爆震后能使发动机正常工作 ,一般取汽油发动机的最低起动转速为50r/ min～70 r/ min ; 柴油发动机靠压缩点火 ,最低的起动转速要高一些。因为转速低时,由于压缩时间长 , 散热、漏气增加 ,就会使压缩行程终了时空气温度降低，使燃料不易点燃 ,所以柴油机的最低起动转速比汽油机要高,其值随发动机形式的不同而不同, 一般为 100 r/ min ～200 r/ min , 再根据选择好的起动机驱动齿轮与发动机的齿环的最佳传动比i (如奥迪轿车的最佳传动比为 1511) ,即可计算出起动机驱动发动机的最低驱动转速 。即:
i = / = /
Starter must be launched to make the engine work a minimum speed, the rated speed is the starter, and starter of the rated power P determined by the minimum start-up engine speed n_f (unit: r / min) and huge start-up resistance M_f (unit: Nm), that is: P ≥ (M_f × n_f) / 9549.3KW.The engine is determined, start the engine torque and minimum speed start-up will have been identified. In accordance with the conditions of vaporization of gasoline engines in the 0 ~ 20 degrees starting at the minimum speed is generally 35 r / min ~ 40 r / min, at a lower temperature in order to guarantee the start-up reliability and wear and tear to consider in order to in paragraph 1 times after detonation engine can work, generally take the lowest gasoline engine start-up speed for the 50r / min ~ 70 r / min; diesel engines rely on compression ignition, the minimum start-up speed is higher. Because the speed is low, as a result of compression time, heat dissipation, increased leakage, it will cause the end of compression stroke to
现代汽车全部采用电力起动机，起动机的功能就是迅速、可靠地起动发动机，使发动机正常工作。所以在选择发动机，必须确定好与之配套的起动机；当然还必须选择好起动机与发动机的最佳传动比及适配的蓄电池的电荷量等。为了使发动机能迅速、可靠地起，起动机必须具有足够的功率，否则就有可能起动不了发动机，或出现重复起动的次数增多，起动时间延长，烧毁起动机，消耗过多的燃料等不利的影响。
1.起动机额定功率参数的选择
1.1 起动机驱动发动机的最低工作转速。
起动机必须具有使发动机发动的最低工作转速，即为起动机的额定转速，而起动机的额定功率P决定于发动机的最低起动转速（单位：r/min）和起动阻力钜(单位：Nm),即：P≥(×)/9549.3KW。
发动机一经确定，发动机的启动阻力矩和最低起动转速也就已经确定。根据汽化条件，汽油发动机在0~20度时的最低起动转速一般为35 r/ min～40 r/ min ,为了在更低的温度下保证起动的可靠性及考虑各种损耗 ,以便在第 1 次爆震后能使发动机正常工作 ,一般取汽油发动机的最低起动转速为50r/ min～70 r/ min ; 柴油发动机靠压缩点火 ,最低的起动转速要高一些。因为转速低时,由于压缩时间长 , 散热、漏气增加 ,就会使压缩行程终了时空气温度降低，使燃料不易点燃 ,所以柴油机的最低起动转速比汽油机要高,其值随发动机形式的不同而不同, 一般为 100 r/ min ～200 r/ min , 再根据选择好的起动机驱动齿轮与发动机的齿环的最佳传动比i (如奥迪轿车的最佳传动比为 1511) ,即可计算出起动机驱动发动机的最低驱动转速 。即:
i = / = /
