車(chē)輛工程專(zhuān)業(yè)畢業(yè)論文外文翻譯---混合動(dòng)力系統(tǒng)驅(qū)動(dòng)力的串并聯(lián)控制(文件)
【正文】 power performance needed in Japan. . Plaary gear ratioρ The plaary gear ratio (ρ ) has almost no effect on fuel economy and/or emissions. This is because the required engine power (. engine condition) depends on vehicle speed, driving force and battery condition, and not on the plaary gear ratio. Conversely, it is largely limited by the degree of installability in the vehicle and manufacturing aspects, leaving little room for design. In the currently developed THS, ρ =. . Maximum engine power Since the battery cannot be used for cruising due to its limited power storage capacity, most driving is reliant on engine power only. Fig. 2 shows the power required by a vehicle equipped with the THS, based on its driving resistance. Accordingly, the power that is required for cruising on a level road at 140 km/h or climbing a 5% slope at 105 km/h will be 32 kW. If the transmission loss is taken into account, the engine requires 40 kW (=Pe max) of power. The THS uses an engine with maximum power of 43 kW in order to get good vehicle performance while maintaining good fuel economy. . Maximum generator torque As described in Section 2, the maximum engine speed is 4000 rpm (=Ne max). To attain maximum torque at this speed, maximum engine torque is obtained as follows: From Eq. (3), the maximum torque on the generator axis will be as follows: This is the torque at which the generator can operate without being driven to over speed. Actually, higher torque is required because of acceleration/deceleration of generator speed and dispersion of engine and/or generator torque. By adding 40% torque margin to the generator, the necessary torque is calculated as follows: . Maximum motor torque From Fig. 3, it can be seen that the motor axis needs to have a torque of 304 Nm to acquire the 30% slope climbing performance. This torque merely balances the vehicle on the slope. To obtain enough starting and accelerating performance, it is necessary to have additional torque of about 70 Nm, or about 370 Nm in total. From Eq. (2), the transmitted torque from the engine is obtained as follows: Consequently, a motor torque of 300 Nm (=Tm max) is necessary. . Maximum battery power As Fig. 2 shows, driving power of 49 kW is needed for climbing on a 5%slope at 130 km/h. Thus, the necessary battery power is obtained by subtracting the enginegenerated power from this. As already discussed, if an engine having the minimum required power is installed, it can only provide 32 kW of power, so the required battery power will be 17 kW. If the possible loss that occurs when the battery supplies power to the motor is taken into account, battery power of 20 kW will be needed. Thus, it is necessary to determine the battery capacity by targeting this output on an actual slope. Table 2 lists the required battery specifications. Table 3 summarizes the specifications actually adopted by the THS and the requirements determined by the above discussion. The required items represent an example when minimum engine power is selected. In other words, if the engine is changed, each o
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