Autel Intelligent Technology Corp., Ltd.

Haibo Pang

Kai Liu

Yong Chen

Huaming Chen

Honghua Lu

Yuanping Luo

Fengji Bi

The present invention relates to the field of automobile diagnosis, and provides an isolation circuit, an automobile diagnosis device and an automobile diagnosis system. The isolation circuit comprises: a first switch circuit electrically connected between an OBD connector of an automobile to be diagnosed and a diagnostic device of the automobile diagnosis device, wherein the OBD connector is further electrically connected to an automobile power supply of the automobile to be diagnosed; and a switch control circuit electrically connected to the OBD connector and the first switch circuit respectively, wherein the switch control circuit does not operate when it is detected that the OBD connector outputs a power supply positive electrode signal and it is not detected that the OBD connector outputs a power supply negative electrode signal, so that the first switch circuit operates in an off state to ensure that the diagnostic device is not powered on; and the switch control circuit outputs a control signal when it is detected that the OBD connector outputs a power supply positive electrode signal and that the OBD connector outputs a power supply negative electrode signal, so that the first switch circuit operates in an on state so as to enable the automobile power supply to supply power to the diagnostic device. Embodiments of the present invention can avoid poor grounding and improve the reliability of automobile diagnosis device.

Isolation circuit, automobile diagnosis device, and automobile diagnosis system

Disclosed are an automobile diagnosis device, system and method. The automobile diagnosis device includes: an automatic diagnosis circuit for acquiring vehicle identification information of an automobile to be diagnosed; a standard communication bus circuit electrically connected to the automatic diagnosis circuit; several diagnostic communication bus circuits including at least one of a 24V CAN bus circuit, an FDCAN bus circuit, a PLC bus circuit and a DoIP bus circuit; a communication module; and a controller. The controller is electrically connected to the automatic diagnosis circuit, the standard communication bus circuit, each diagnostic communication bus circuit and the communication module respectively. The controller is configured to select a target communication bus circuit according to the vehicle identification information and communicate with the automobile to be diagnosed.

Automobile diagnosis device, system and method

Disclosed are an automobile diagnosis device, system and method. The automobile diagnosis device includes: a diagnosis protocol transceiver configured to fault code data of an automobile to be diagnosed; a communication module; a master controller electrically connected to the diagnosis protocol transceiver and the communication module; a multimeter circuit electrically connected to the master controller and configured to send multimeter data to the master controller; an oscilloscope circuit electrically connected to the communication module and configured to send oscilloscope data to the host computer by means of the communication module; a signal generating circuit electrically connected to the master controller and configured to generate an analog waveform signal in response to a driving signal of the master controller. The adaptability of the automobile diagnosis device is improved.

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Guangdong, China

Haibo Pang