Refitting method based on drive-by-wire chassis of new energy automobile

The invention discloses a modification method based on a drive-by-wire chassis of a new energy automobile, which is characterized in that a drive-by-wire system comprising mechanisms such as a controller, a steering system, a braking system and a sensing device is additionally arranged on the basis of an original automobile so as to realize linear control of steering and braking, open source of a communication protocol and external communication; according to the gear shifting function, signals of all gears of an original vehicle gear sensor are simulated and transmitted to an original vehicle VCU to achieve gear shifting, the original vehicle gear signals can be shielded in the signal simulation control process, and the two modes of original vehicle operation gear shifting and drive-by-wire control can be achieved; acceleration and deceleration control is achieved by simulating an original vehicle accelerator pedal signal and transmitting the original vehicle accelerator pedal signal to an original vehicle V