Start and rectification device, range extender, electric vehicle and range extender detection method

Abstract

The invention provides a start and rectification device, a range extender, an electric vehicle and a range extender detection method. The start and rectification device comprises a starter, a rectifier, a current sensor, a hardware processing circuit and a digital processor, wherein the starter converts electric energy into alternating current and outputs the current within a current limit value,the rectifier converts the electric energy into direct current so as to supply power to a battery and a load, the current sensor detects bidirectional current on a direct current bus and outputs an analog signal, the hardware processing circuit conducts filtering and conditioning on the analog signal and then sends the analog signal to the digital processor, the digital processor sets the currentlimit value according to the demagnetization feature of an electric generator, the charge state of the battery and the temperature of a battery cell; according to the filtered and conditioned analog signal, the generated power is calculated, so that the opening degree of a throttle valve is controlled according to the generated power and the rotation speed of the electric generator, and then the output power of the engine is controlled. By the adoption of the start and rectification device, the current within the current limit value is output, the service life of the battery is prolonged, theelectric generator and the engine are protected, and overcurrent damage to the rectifier is avoided; and in this way, the electric generator and the engine operate in the high efficiency area, and theefficiency of a range extender system is improved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a starting rectifier, a range extender, an electric vehicle and a detection method for the range extender. Background technique [0002] In the field of modern automobiles, electric vehicles with energy-saving and environmental protection effects have gradually become the main direction of automobile development, and extended-range electric vehicles are currently one of the mainstream technical directions for the development of electric vehicles. Extended-range electric vehicles can solve the problem of large-scale industrialization of electric vehicles caused by low storage energy of power batteries, short driving range and long charging time, and meet the development needs of electric vehicles. [0003] The starting power of the engine of the extended-range electric vehicle is larger than that at normal temperature when it is started at low temperature, and the current absorbed...

AI Technical Summary

Problems solved by technology

Normally, the current flowing through the battery can be known, but the current flowing to the load cannot be known, which makes the generated current of the range extender unknown, and the power detection of the range extender is difficult, which causes the generator and engine not to work at high efficiency. area, the problem of low efficiency of the range extender system

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