PDU relay adhesion detection circuit and method and automobile operation control method

Abstract

The invention relates to a PDU relay adhesion detection circuit and method and an automobile operation control method. The PDU relay adhesion detection circuit includes a battery box, a main relay, acapacitor, a precharge resistor, a first precharge relay and a second precharge relay, one end of the main relay is electrically connected to the anode end of the battery box, and the other end of themain relay is electrically connected to one end of the capacitor; the other end of the capacitor is electrically connected to the cathode end of the battery box, one end of the precharge resistor iselectrically connected to the common end of the battery box and the main relay, and the other end of the precharge resistor is electrically connected to one end of the first precharge relay; and the other end of the first precharge relay is electrically connected to one end of the second precharge relay, and the other end of the second precharge relay is electrically connected to the common end ofthe main relay and the capacitor. According to the PDU relay adhesion detection circuit and method and the automobile operation control method, the two precharge relays are used for being prechargedin series, the probability of simultaneous adhesion of the two precharge relays is low, and the effect of protecting the battery box can be achieved.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a PDU relay adhesion detection circuit, a detection method and a vehicle operation control method. Background technique [0002] PDU, also known as high-voltage distribution box, is the power distribution center of the high-voltage power system of electric vehicles. It mainly provides high voltage through the control relay. When the relay is stuck and there is no pre-charging circuit, the large current will cause damage to the system battery, electronic control, etc. Parts are damaged. Therefore, generally before the power is turned on to send a control signal to the pre-charging relay, the adhesion detection of the relay will be carried out, that is, the adhesion detection of the power-on, and the fault will be reported to the vehicle. However, this detection method has the following shortcomings: For example, the pre-charging road There is only one pre-charging relay...

AI Technical Summary

Problems solved by technology

[0002] PDU, also known as high-voltage distribution box, is the power distribution center of the high-voltage power system of electric vehicles. It mainly provides high voltage through the control relay. When the relay is stuck and there is no pre-charging circuit, the large current will cause damage to the system battery, electronic control, etc. damaged parts

Therefore, generally before the power is turned on to send a control signal to the pre-charging relay, the adhesion detection of the relay will be carried out, that is, the adhesion detection of the power-on, and the fault will be reported to the vehicle. However, this detection method has the following shortcomings: For example, the pre-charging road There is only one pre-charging relay. If the relay is stuck, when the battery box does not have a protective relay, even if the vehicle is powered off, the high voltage of the battery will discharge to the rear load through the pre-charging path.

Images