車輛工程專業(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(編輯修改稿)
2025-06-25 15:56 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 (=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 of the items have to be changed accordingly. 4. Driving force control The THS requires controls not necessary for conventional or electric vehicles in order to control the engine, motor and generator cooperatively. Fig. 4 outlines the control system. Fig. 4. Control diagram of the THS. Inputs of control system are accelerator position, vehicle speed (motor speed), generator speed and available battery power. Outputs are the enginerequired power, generator torque and motor torque. First, drive torque demanded by the driver (converted to the motor axis) is calculated from the accelerator position and the vehicle speed. The necessary drive power is calculated from this torque and the motor speed. Required power for the system is the total of the required drive power, the required power to charge the battery and the power loss in the system. If this total required power exceeds the prescribed value, it bees required engine power. If
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