CAN bus based on-board on-line performance measuring device

A vehicle on-line performance testing device based on a CAN bus disclosed by the utility model comprises a control unit of an automotive engine, an automatic anti-lock and driving anti-skid control unit, an electric power-assisted steering control unit, an automatic gear shifting control unit, a CAN bus, a USB-to-CAN equipment and a computer. The control units and the USB-to-CAN equipment are connected with the CAN respectively; and the computer is connected with an output port of the USB-to-CAN equipment. The device adopts the CAN bus to prevent a plurality of complicated connections between the control units; networks measurement and control processes; and eliminates conditionality of traditional testing devices. The utility model makes it convenient that the computer obtains corresponding information from the bus quickly; conducts real-time synchronous test on a plurality of control units on real vehicles; the test data are accurate, the test efficiency is high; moreover, the utility model can be used in different environments and weather.