Electric steering and braking protection device and method for pure electric mine truck in case of high voltage drop

Abstract

The invention discloses an electric steering and braking protection device and method for a pure electric mine truck during high voltage falling, belongs to the technical field of electric mine trucks, and solves the problems that in the prior art, continuous operation of the mine truck cannot be met, the mine truck is not suitable for different working conditions, and the safety is low. The input end of the auxiliary power supply is connected with the vehicle-mounted power battery through the DC-DC inverter voltage reduction device, the output end of the auxiliary power supply is connected with the all-in-one DC / AC in parallel, the other output end of the auxiliary power supply is connected with the discharge relay, the discharge relay is connected with the vehicle control unit VCU, and the vehicle control unit VCU is connected with the all-in-one DC / AC through a communication bus. When the vehicle control unit detects that the all-in-one bus is under-voltage, namely the high-voltage falling condition occurs, the auxiliary power supply is started, so that it is guaranteed that the electric steering and braking can still work normally under the high-voltage falling condition, the situation that a mine truck is forced to be shut down and repaired due to high-voltage falling is avoided, and the running safety and continuity of the mine truck are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric mining trucks, and in particular, relates to an electric steering and braking protection device and method for a pure electric mining truck when high voltage is lost. Background Art

[0002] With the gradual acceleration of electrification of construction machinery, electric wide-body mining dump trucks (hereinafter referred to as electric mining trucks) have become increasingly common products in major mines and gravel aggregate yards. The application of electric mining trucks in mining areas is imperative. The popularization of pure electric battery-swap mining trucks can completely solve the problem of power supply for pure electric mining trucks. Electric mining trucks are equipped with a power steering system, which can provide steering assistance to electric mining trucks when the driver controls the steering of the electric mining truck. In pure electric mining trucks, electric steering pumps and air compressors are usually powered by an all-in-one auxiliary controller DC / AC. However, in actual use, if high voltage drops, although the original vehicle steering is equipped with an emergency accumulator and the brake is equipped with an air tank, due to the special actual working conditions of the mining truck, such as the large number of vehicles on the road, it is not allowed to stop on the roadside for maintenance, otherwise there will be great safety hazards. The existing safeguards are difficult to meet the safety requirements of continuous operation and non-stop operation of mining trucks. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide an electric steering and braking protection device and method for a pure electric mining truck when high voltage is lost, which can meet the needs of continuous operation of the mining truck, is suitable for different working conditions and has high safety.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the electric steering and braking protection device for pure electric mining trucks when high voltage is lost is as follows: The invention discloses an electric steering and braking protection device for a pure electric mining truck when high voltage is lost, comprising an on-board power battery, an auxiliary power supply, an all-in-one DC / AC, a discharge relay, and a vehicle controller VCU. The input end of the auxiliary power supply is connected to the on-board power battery via a DC-DC inverter step-down device, the output end of the auxiliary power supply is connected to the all-in-one DC / AC in parallel, the other output end of the auxiliary power supply is connected to the discharge relay, the discharge relay is connected to the vehicle controller VCU, the vehicle controller VCU and the all-in-one DC / AC are connected via a communication bus, the discharge relay is triggered by a control signal of the auxiliary power supply, the vehicle controller VCU is used to monitor the state of the discharger to understand the working condition of the auxiliary power supply, and the DC-DC inverter step-down device is used to convert the high-voltage direct current of the on-board power battery into the low-voltage direct current required by the auxiliary power supply.

[0005] Preferably, the output terminal of the auxiliary power supply is connected to the multi-in-one DC / AC via a cable and a connector, and a rectifier bridge is provided on the connection line between the auxiliary power supply and the multi-in-one DC / AC.

[0006] Preferably, the auxiliary power supply is connected to the discharge relay via a control line, and the discharge relay is connected to the vehicle controller VCU via a signal line.

[0007] Preferably, the communication bus includes the CAN bus communication protocol.

[0008] Preferably, a filter is also provided on the connection line between the vehicle controller VCU and the multi-in-one DC / AC.

[0009] A method for protecting electric steering and braking when a pure electric mining truck loses high voltage includes the following steps: S1 When the multi-in-one DC / AC is working normally, the auxiliary power supply is in a standby state and has no power output; when the vehicle controller VCU detects a fault or loss of high voltage in the multi-in-one DC / AC, it records the undervoltage event and issues an alarm signal. S2 The vehicle controller VCU judges the state of the auxiliary power supply. If the auxiliary power supply is in a standby state, it triggers the start of the auxiliary power supply. If the auxiliary power supply is already in a working state, there is no need to start it again. S3 The vehicle controller VCU sends a start command to the auxiliary power supply via the CAN bus or the control line. After receiving the start command, the auxiliary power supply performs self-check and initialization operations to ensure that it is in a normal working state. The auxiliary power supply starts and sends a start success signal to the vehicle controller VCU. The vehicle controller VCU incorporates the auxiliary power supply into the management of the vehicle system, closes the discharge relay, and connects the auxiliary power supply to the vehicle circuit.

[0010] Preferably, in step S1, the vehicle controller VCU periodically reads the output signal of the voltage sensor to real-time monitor the bus voltage of the multi-in-one DC / AC. When the bus voltage is lower than 80% or 90% of the set undervoltage threshold, the vehicle controller VCU determines that the multi-in-one DC / AC bus is undervoltage.

[0011] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, when the vehicle controller detects that the multi-in-one bus is undervoltage, that is, when there is a loss of high voltage, it starts the auxiliary power supply to ensure that the electric steering and braking can still work normally under the condition of loss of high voltage, avoiding the forced shutdown and repair of the mining truck due to loss of high voltage, and improving the safety and continuity of the operation of the mining truck; the vehicle controller and the auxiliary power supply are connected via the CAN bus or the control line, avoiding electrical connection when the communication condition is unstable, ensuring that the entire device can monitor the state of the auxiliary power supply in time, and ensuring the safe operation of the entire system. Description of the Drawings

[0012] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The invention is further described below in conjunction with the accompanying drawings and specific embodiments: like Figure 1 As shown, a pure electric mining truck electric steering and braking protection device when high voltage is lost includes a vehicle-mounted power battery, an auxiliary power supply, an all-in-one DC / AC, a discharge relay, and a vehicle controller VCU. The input end of the auxiliary power supply is connected to the vehicle-mounted power battery via a DC-DC inverter step-down device, the output end of the auxiliary power supply is connected in parallel with the all-in-one DC / AC, and the other output end of the auxiliary power supply is connected to the discharge relay, and the discharge relay is connected to the vehicle controller VCU. The vehicle controller VCU is connected to the all-in-one DC / AC via a communication bus, and a filter is also provided on the connection line between the vehicle controller VCU and the all-in-one DC / AC. By setting a filter protection element, the anti-interference ability of communication is improved, the discharge relay is triggered by the control signal of the auxiliary power supply, the vehicle controller VCU is used to monitor the state of the discharger and understand the working condition of the auxiliary power supply, and the DC-DC inverter step-down device is used to convert the high-voltage direct current of the vehicle-mounted power battery into the low-voltage direct current required by the auxiliary power supply. Among them, the specification of the auxiliary power supply is 10KWh. The on-board power battery and the auxiliary power supply are connected by a high-quality cable. The cable has sufficient current carrying capacity to meet the needs of charging and discharging, ensuring safe and reliable power transmission. The on-board power battery and the auxiliary power supply can be connected to the vehicle controller VCU through the CAN bus to achieve information sharing and collaborative control. The battery status information, such as voltage, current, remaining power, etc., is sent to the vehicle's central controller through the CAN bus. The auxiliary power supply can also send its own status information to the central controller through the CAN bus. The central controller can adjust the vehicle's operating mode and charging strategy based on this information to achieve optimal energy management. The CAN bus provides information to the VCU, and the VCU regulates the on-board power battery to charge the auxiliary power supply. The auxiliary power supply supplies power to other electrical appliances in the vehicle, such as vehicle starting, lighting, audio, air conditioning, etc.

[0014] In the present invention, the output end of the auxiliary power supply is connected to the all-in-one DC / AC via a cable and a connector, and a rectifier bridge is provided on the connection line between the auxiliary power supply and the all-in-one DC / AC. The rectifier bridge is provided to protect the components and prevent the current from flowing in reverse.

[0015] In the present invention, the auxiliary power supply is connected to the discharge relay via a control line, and the discharge relay is connected to the vehicle controller VCU via a signal line. The control line has good insulation and anti-interference performance to ensure accurate transmission of the control signal, and the signal line has good anti-interference ability and reliability to ensure that the vehicle VCU obtains the status information of the discharge relay.

[0016] In the present invention, the communication bus includes a CAN bus communication protocol. The vehicle controller VCU obtains the working status information of the all-in-one DC / AC, such as bus voltage, current, etc., through the communication and sensor bus.

[0017] A method for electric steering and braking protection when a pure electric mining truck loses high voltage comprises the following steps: S1 When the all-in-one DC / AC is working normally, the auxiliary power supply is in standby state and has no power output; when the vehicle controller VCU detects that the all-in-one DC / AC has a fault or drops high voltage, the vehicle controller VCU periodically reads the output signal of the voltage sensor and monitors the bus voltage of the all-in-one DC / AC in real time. When the bus voltage is lower than the set undervoltage threshold of 80% or 90%, the vehicle controller VCU determines that the all-in-one DC / AC bus is undervoltage, records the undervoltage event, and sends an alarm signal; S2 The vehicle controller VCU determines the state of the auxiliary power supply. If the auxiliary power supply is in standby state, the auxiliary power supply is triggered to start. If the auxiliary power supply is already in working state, there is no need to start it again. S3 The vehicle controller VCU sends a start command to the auxiliary power supply via the CAN bus or control line. After receiving the start command, the auxiliary power supply performs self-check and initialization operations to ensure that it is in normal working condition. The auxiliary power supply starts and sends a start success signal to the vehicle controller VCU. The vehicle controller VCU incorporates the auxiliary power supply into the management of the vehicle system, closes the discharge relay, and connects the auxiliary power supply to the vehicle circuit.

[0018] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in the shape, structure, characteristics and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric steering and braking protection device for a pure electric mining truck when high voltage is lost, characterized in that: It includes a vehicle-mounted power battery, an auxiliary power supply, an all-in-one DC / AC, a discharge relay, and a vehicle controller VCU. The input end of the auxiliary power supply is connected to the vehicle-mounted power battery via a DC-DC inverter step-down device, the output end of the auxiliary power supply is connected in parallel with the all-in-one DC / AC, the other output end of the auxiliary power supply is connected to the discharge relay, the discharge relay is connected to the vehicle controller VCU, the vehicle controller VCU and the all-in-one DC / AC are connected via a communication bus, the discharge relay is triggered by a control signal of the auxiliary power supply, the vehicle controller VCU is used to monitor the state of the discharger to understand the working condition of the auxiliary power supply, and the DC-DC inverter step-down device is used to convert the high-voltage direct current of the vehicle-mounted power battery into the low-voltage direct current required by the auxiliary power supply.

2. The electric steering and braking protection device for pure electric mining trucks when high voltage is lost according to claim 1, characterized in that: The output end of the auxiliary power supply is connected to the all-in-one DC / AC via a cable and a connector, and a rectifier bridge is provided on the connection line between the auxiliary power supply and the all-in-one DC / AC.

3. The electric steering and braking protection device for pure electric mining trucks when high voltage is lost according to claim 1, characterized in that: The auxiliary power supply is connected to the discharge relay via a control line, and the discharge relay is connected to the vehicle controller VCU via a signal line.

4. The electric steering and braking protection device for pure electric mining trucks when high voltage is lost according to claim 1, characterized in that: The communication bus includes a CAN bus communication protocol.

5. The electric steering and braking protection device for pure electric mining trucks when high voltage is lost according to claim 1, characterized in that: The vehicle controller VCU and the all-in-one DC / AC connection line are also provided with filters.

6. A method for electric steering and braking protection when a pure electric mining truck loses high voltage, comprising the following steps: S1 When the all-in-one DC / AC is working normally, the auxiliary power supply is in standby state and has no power output; when the vehicle controller VCU detects that the all-in-one DC / AC fails or drops high voltage, it records the undervoltage event and sends an alarm signal S2 The vehicle controller VCU determines the state of the auxiliary power supply. If the auxiliary power supply is in standby state, the auxiliary power supply is triggered to start. If the auxiliary power supply is already in working state, there is no need to start it again. S3 The vehicle controller VCU sends a start command to the auxiliary power supply via the CAN bus or control line. After receiving the start command, the auxiliary power supply performs self-check and initialization operations to ensure that it is in normal working condition. The auxiliary power supply starts and sends a start success signal to the vehicle controller VCU. The vehicle controller VCU incorporates the auxiliary power supply into the management of the vehicle system, closes the discharge relay, and connects the auxiliary power supply to the vehicle circuit.

7. The electric steering and braking protection method for pure electric mining trucks when high voltage is lost according to claim 6, characterized in that: In step S1, the vehicle controller VCU periodically reads the output signal of the voltage sensor and monitors the bus voltage of the all-in-one DC / AC in real time. When the bus voltage is lower than the set undervoltage threshold of 80% or 90%, the vehicle controller VCU determines that the all-in-one DC / AC bus is undervoltage.

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