Electro-mechanic mixed driving system of automobile

Abstract

The invention relates to a kind of automobile electrical-mechanical mixed driving system . It includes engine , starter motor , driving motor , battery , an inverter that provides alternating current to the starter motor and the driving motor , a controlling device that can judge the needed speed gear of the car and calculate the driving torsion or speed needing amount of the car , meanwhile give the corresponding speed gear and the power supply frequency of the electrical machinery or controlling signal of phase place , according to the rotational speed signal of the engine and the driving motor and the driving signal . Among them , the starter motor and the driving motor can adopts multi-speed multi-phase alternating current reaction electrical machinery , or the starter motor adopts single-speed multi-phase alternating current electrical machinery and the driving motor adopts multi-speed multi-phase alternating current electrical reaction machinery , or the starter motor adopts multi-speed multi-phase alternating current electrical reaction machinery and the driving motor adopts single-speed multi-phase alternating current electrical machinery . The characteristic of the invention is that it saves the mechanical gearbox , using an inverter supply alternating current for two electrical machineries , reduce fabrication cost o the system , and improves the motor utilization ratio of energy .

Description

technical field [0001] The invention relates to an automobile driving system, in particular, it is an automobile electromechanical hybrid driving system, which can be used for large and small passenger cars, off-road vehicles and light trucks. Background technique [0002] The driving of the existing ordinary automobile is to convert the chemical energy of the fuel into mechanical energy by the engine, and then transmit it to the wheel shaft through the transmission mechanism, thereby turning the wheels to drive the vehicle. The power demand of the vehicle during driving is very uneven. For example, when accelerating and climbing a slope, the power demand is large, but when driving at a constant speed on flat ground, the power demand is small. Generally speaking, the high power demand lasts The time is short, and the low power lasts a long time. In order to meet the vehicle's demand for high power when accelerating and climbing, ordinary cars must be equipped with high-powe...

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Problems solved by technology

However, this system does not take into account the high cost of the inverter. Not only is the cost of the inverter high, but its cost also increases with the increase of its power.

The system not only uses two inverters, but also the power of the second inverter is particularly large (this is because the drive motor relies on a single second inverter to provide it with AC power, and the drive motor is used to meet the needs of the vehicle. When accelerating at low and medium speeds, a relatively large driving torque must be selected), so the cost of the second inverter B is higher

In addition, this system also has a shortcoming that when the vehicle is accelerating at low or medium speeds, the alternating current generated by the starter motor must be converted several times by the first inverter A, the battery, and the second inverter B before it can be sent to the inverter. Drive the motor, which will undoubtedly cause energy loss and reduce the energy utilization rate of the engine

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