WO2011003311A1

WO2011003311A1 - Security monitoring system for electric vehicle and monitoring method thereof

Info

Publication number: WO2011003311A1
Application number: PCT/CN2010/073486
Authority: WO
Inventors: 杨上东
Original assignee: 芜湖普威技研有限公司
Priority date: 2009-07-08
Filing date: 2010-06-03
Publication date: 2011-01-13
Also published as: CN101596901A; CN101596901B

Abstract

A security monitoring system for an electric vehicle and a monitoring method thereof are provided. The security monitoring system comprises a security monitor (1). The security monitor (1) receives signals from an accelerator pedal position sensor (5), a motor rotational speed sensor (7), a motor bus voltage sensor (8) and a motor current sensor (6) of the vehicle and outputs control signals to the enable pin of a motor driver (3) and the control pin of a switching circuit (12) respectively. A switch controlled by the signal of the control pin is connected in series between the input pin and the output pin of said switching circuit (12), both of which are connected in series in the input circuit of a relay (4) for controlling the on/off of the power supply circuit for a power battery (11). The security monitor obtains the required torque or power of the vehicle and the actual output torque or power of the vehicle according to information such as accelerator pedal position, motor rotational speed, motor bus voltage and motor current. When the torque or power of the vehicle exceeds requirement, a driving motor is shut down and the power supply circuit for the power battery (11) is cut off, thus ensuring the security of the vehicle.

Description

Electric vehicle safety monitoring system and monitoring method thereof

The present invention relates to the field of electric vehicle control, and in particular to the technical field of electric vehicle safety, and more particularly to a safety monitoring system for an electric vehicle and a monitoring method thereof. Background technique

Energy crisis and environmental degradation have become important factors restricting global development. Studying energy-efficient and environmentally-friendly vehicles is one of the effective means to alleviate energy pressure and reduce environmental pollution. Compared with traditional diesel locomotives or hybrid vehicles, electric vehicles are electrically driven to reduce emissions and reduce energy consumption. Since electric vehicles use high-voltage batteries as all or part of the power source, there are some safety hazards, such as motor torque or power surge due to software errors, human error, electromagnetic interference, hardware damage, etc., far beyond the demand level, if not timely Exclusions may cause serious damage to the battery and even self-ignition of the motor and circuit. Summary of the invention

A first object of the present invention is to provide a safety monitoring system for an electric vehicle, which can monitor the required torque or power of the vehicle and the actual output torque or power of the vehicle in real time, and when the torque or power of the vehicle exceeds the demand. Turn off the motor and disconnect the power circuit of the power battery to prevent serious consequences.

To achieve the above object, the present invention provides a safety monitoring system for an electric vehicle, comprising a safety monitor that receives an accelerator pedal position sensor, a motor speed sensor, a motor bus voltage sensor, and a motor current sensor of the vehicle. a signal, and respectively outputting a control signal to an enable pin of the motor driver and a control pin of a switch circuit, wherein a switch controlled by the control pin signal is connected in series between the input pin and the output pin of the switch circuit, and the input of the switch circuit The foot and the output pin are connected in series to an input circuit of a relay that controls the power battery power circuit to be turned on and off.

The safety monitor derives the demand torque or power of the vehicle from the actual output torque or power of the vehicle based on the accelerator pedal position of the vehicle, the motor speed, the motor bus voltage and the motor current, and sends a signal to the motor when the torque or power exceeds the demand. The motor driver and the relay connected in series on the power battery power circuit, turn off the motor and disconnect the power circuit of the power battery by disconnecting the relay.

The safety monitor is connected to an enable pin of the motor driver and a control leg of the switch circuit through a collision switch, and the collision switch is controlled by a collision sensor. Collision sensor when a car collides Disconnect the collision switch, thus turning off the drive motor and disconnecting the power circuit of the power battery to avoid serious consequences. The above safety monitor can be a single chip microcomputer, which is small in size and low in cost.

A second object of the present invention is to provide a monitoring method for the above security monitoring system.

The first monitoring method includes the following steps: A: The safety monitor collects the signals of the accelerator pedal position sensor and the motor speed sensor, and obtains the driver's request torque by looking up the table; B: The safety monitor collects the motor drive current through the motor current sensor The motor bus voltage is collected by the motor bus voltage sensor, the motor speed is collected by the motor speed sensor, and the actual output torque of the drive motor is obtained according to the collected motor drive current, the motor bus voltage, and the motor speed; C: The safety monitor will drive The request torque of the member is compared with the actual output torque of the drive motor. When the actual output torque of the drive motor is greater than the requested torque of the driver, the safety monitor turns off the motor driver and disconnects the power circuit of the power battery.

In the above B step, the actual output torque of the drive motor is obtained as follows: The safety monitor first calculates the value of the motor drive current X motor bus voltage X motor efficiency, and then according to the product and the motor speed, the corresponding table is obtained by looking up the table. The actual output torque of the drive motor, wherein the motor efficiency is obtained by looking up the table.

In addition, when the collision sensor detects a collision of the car, the control collision switch is turned off, thereby turning off the motor driver and disconnecting the power circuit of the power battery.

The second monitoring method includes the following steps: A: The safety monitor collects the signal of the accelerator pedal position sensor and the motor speed, and obtains the driver's request power by looking up the table; B: The safety monitor collects the motor drive through the motor current sensor Current, the motor bus voltage is collected by the motor bus voltage sensor, the motor speed is collected by the motor speed sensor, and the actual output power of the drive motor is obtained according to the collected motor drive current, the motor bus voltage, and the motor speed; C: The safety monitor will The driver's request power is compared with the actual output power of the drive motor. When the actual output power of the drive motor is greater than the driver's requested power, the safety monitor turns off the motor driver and disconnects the power circuit of the power battery.

In the above B step, the actual output power of the drive motor = motor drive current X motor bus voltage X motor efficiency, where the motor efficiency is obtained by looking up the table.

The invention provides a safety monitoring system for an electric vehicle and a monitoring method thereof. The safety monitor can effectively prevent the sudden increase of the power or torque of the motor and exceed the demand by monitoring the key components such as the accelerator pedal and the driving motor of the automobile. The potential safety hazards have also increased the insurance measures for car collisions, ensuring the safety of electric vehicles. DRAWINGS

1 is a structural view of a safety monitoring system of an electric vehicle according to Embodiment 1;

Figure 2 is a schematic view showing the connection of the switch circuit and the relay of Figure 1. detailed description

The invention will be described in detail below with reference to specific embodiments and drawings.

Example 1

As shown in FIG. 1, the safety monitoring system of the electric vehicle of the present embodiment includes a safety monitor 1, which receives the accelerator pedal position sensor 5 of the automobile, the motor speed sensor 7, the motor bus voltage sensor 8, and the motor. The signal of the current sensor 6 outputs a control signal to the enable pin of the motor driver 3 and the control pin of a switch circuit 12 through a collision switch 2, and the crash switch 2 is connected to the collision sensor 10 and controlled by the collision sensor 10. . The input pin and the output pin of the switch circuit 12 are connected in series to the input circuit of the relay 4 that controls the power circuit 11 to turn on and off (the thick solid line in the figure indicates the power supply circuit of the power battery). The motor speed sensor 7, the motor bus voltage sensor 8, the motor current sensor 6, and the motor driver 3 are respectively connected to the drive motor 9.

As shown in FIG. 2, the switch circuit 12 includes a relay RL1. One input terminal (ie, pin 1) of the relay RL1 serves as a control pin of the switch circuit 12, and is connected to the collision switch through the resistor R1, and the other input terminal (ie, the foot) 2) Grounding, so when the collision switch inputs a high level, a current flows through the resistor R1, causing the relay RL1 to pull in, wherein the resistor R1 acts as a current limiting. One output terminal of relay RL1 (ie, foot 4) is connected as an input circuit of switch circuit 12 to an input circuit of relay 4 (ie, RL2), and the other output terminal (ie, foot 3) is used as an output pin of switch circuit 12 and relay 4 One input (ie, foot 2) is connected, the other input of relay 4 (ie, foot 1) is connected to the input circuit, and the two outputs of relay 4 (ie, feet 3, 4) are connected in series with the power circuit of the power battery. Only when the relay RL1 is pulled in, the input circuit of the relay 4 can be turned on. At this time, if there is current in the input circuit, the relay 4 is sucked; when the relay RL1 is turned off, no current flows through the input circuit of the relay 4. , Relay 4 is also disconnected.

The specific control method can be set as follows: The collision switch 2 is a normally closed switch, and only when the car collides, the collision sensor 10 controls the collision switch 2 to be disconnected; in addition, the safety monitor 1 passes through the collision switch 2 under normal conditions. The enable pin of the motor driver 3 and the control pin of the switch circuit 12 emit a preset level signal, for example, a high level signal of 5V, so that the relay RL1 is pulled in, and the input circuit of the relay 4 is turned on, so that the relay 4 can be sucked under the control of the vehicle controller, the drive motor 9 can work normally under the control of the vehicle controller; when an unexpected situation occurs, the safety monitor 1 passes the collision switch 2 to the motor driver 3 and The relay 4 emits a low level signal (for example, a signal of 0V), or the collision switch 2 is turned off, so that the enable pin of the motor driver 3 and the control pin of the switch circuit 12 can no longer receive a preset high level signal. The motor driver 3 turns off the drive motor 9, while the relay RL1 is turned off, and the input circuit of the relay 4 is turned off, so that the relay 4 is also turned off, thereby disconnecting the power supply circuit of the power battery 11.

The monitoring method of the safety monitoring system of the above electric vehicle includes the following steps:

A: The safety monitor 1 collects signals of the accelerator pedal position sensor 5 and the motor speed sensor 7, and obtains the driver's requested torque by checking the <accelerator pedal position-motor tachometer-vehicle torque> table, the above <accelerator pedal position- The motor tachometer-automotive torque> table is a table that the technicians pre-existing according to the test and pre-existing in the safety monitor 1 to reflect the relationship between the motor speed, the accelerator pedal position and the vehicle torque. Generally, the vehicle torque and the motor speed The distance that the accelerator pedal is pressed is approximately proportional;

B: Safety monitor 1 collects motor drive current through motor current sensor 6, collects motor bus voltage through motor bus voltage sensor 8, collects motor speed through motor speed sensor 7, and according to collected motor drive current, motor bus voltage, motor The rotational speed gives the actual output torque of the drive motor 9;

C: The safety monitor 1 compares the driver's requested torque with the actual output torque of the drive motor 9, and when the driver's requested torque is less than the actual output torque of the drive motor 9, the safety monitor 1 turns off the motor drive 3, thereby closing The motor 9 is driven, and the relay 4 is controlled to be turned off, thereby disconnecting the power supply circuit of the power battery 11.

In the above B step, the actual output torque of the drive motor is obtained as follows: The safety monitor 1 first calculates the value of the motor drive current X motor bus voltage X motor efficiency, and then passes the < motor output power-motor according to the product and the motor speed. The speed-motor output torque> table gives the actual output torque of the corresponding drive motor 9 at this time. The above-mentioned <motor output power-motor speed-motor output torque> is the pre-existing safety monitoring of the technicians according to the test before leaving the factory. The table reflecting the relationship between the motor speed, the output power and the motor output torque in the device 1 is generally proportional to the motor output torque and the output speed of the motor; the motor efficiency is checked by the <motor speed-motor efficiency> table. The above-mentioned <motor speed-motor efficiency> table is a table which is obtained by the technicians before leaving the factory and is pre-existing in the safety monitor 1 to reflect the relationship between the motor speed and the motor efficiency. The relationship between the motor speed and the motor efficiency is due to the motor. Different and different.

Further, when the collision sensor 10 detects that the vehicle has collided, the control collision switch 2 is turned off, the motor driver 3 is turned off, thereby turning off the drive motor 9; and the relay 4 is turned off, thereby turning off the power supply circuit of the power battery 11. Example 2:

Different from the above embodiment, the monitoring method of this embodiment includes the following steps:

A: The safety monitor 1 collects the signal of the accelerator pedal position sensor 5 and the motor speed, and obtains the driver's request power by checking the <accelerator pedal position-motor speed-motor power> table. The above <accelerator pedal position-motor speed- The motor power> table is a table based on the test and pre-existing in the safety monitor 1 to reflect the relationship between the accelerator pedal position, the motor speed and the motor power. Generally speaking, the distance between the accelerator pedal and the motor speed The product of the product is approximately proportional to the power of the motor;

B: Safety monitor 1 collects motor drive current through motor current sensor 6, collects motor bus voltage through motor bus voltage sensor 8, collects motor speed through motor speed sensor 7, and according to collected motor drive current, motor bus voltage, motor The rotational speed gives the actual output power of the drive motor;

C: The safety monitor 1 compares the driver's requested power with the actual output power of the drive motor 9, and when the driver's requested power is less than the actual output power of the drive motor 9, the safety monitor 1 turns off the motor driver 3, thereby closing The motor 9 is driven, and the relay 4 is controlled to be turned off, thereby disconnecting the power supply circuit of the power battery 11.

In the above B step, the actual output power of the drive motor 9 = motor drive current X motor bus voltage X motor efficiency, wherein the motor efficiency is obtained by checking the <motor speed - motor efficiency> table, the above <motor speed - motor efficiency> table According to the test, the technicians before the factory leave the pre-existing table in the safety monitor 1 reflecting the relationship between the motor speed and the motor efficiency. The relationship between the motor speed and the motor efficiency varies from motor to motor.

Further, when the collision sensor 10 detects a collision of the vehicle, the control collision switch 2 is turned off, the motor driver 3 is turned off, thereby turning off the drive motor 9; and the relay 4 is turned off, thereby disconnecting the power supply circuit of the power battery 11.

It should be noted that the above embodiments are only intended to illustrate the invention and are not to be construed as limiting the scope of the invention. The spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

Claim

What is claimed is: 1. A safety monitoring system for an electric vehicle, comprising: a safety monitor, wherein the safety monitor receives signals of an accelerator pedal position sensor, a motor speed sensor, a motor bus voltage sensor, and a motor current sensor of the vehicle, and The control signal is respectively output to the enable pin of the motor driver and the control pin of a switch circuit, and a switch controlled by the control pin signal is connected in series between the input pin and the output pin of the switch circuit, and the input pin and the output of the switch circuit are respectively connected. The foot string is connected to an input circuit of a relay that controls the power battery power circuit to be turned on and off.

2. The safety monitoring system for an electric vehicle according to claim 1, wherein said safety monitor is connected to an enabling leg of said motor driver and a control leg of said switching circuit via a collision switch, said collision The switch is controlled by a collision sensor.

3. A method for monitoring an electric vehicle safety monitoring system, comprising the steps of:

A: The safety monitor collects the signals of the accelerator pedal position sensor and the motor speed sensor, and obtains the driver's request torque by looking up the table;

B: The safety monitor collects the motor drive current through the motor current sensor, collects the motor bus voltage through the motor bus voltage sensor, collects the motor speed through the motor speed sensor, and obtains the motor drive current, the motor bus voltage, and the motor speed according to the motor. The actual output torque of the drive motor;

C: The safety monitor compares the driver's request torque with the actual output torque of the drive motor. When the actual output torque of the drive motor is greater than the driver's requested torque, the safety monitor closes the motor drive and disconnects the power circuit of the power battery. .

4. The monitoring method of the electric vehicle safety monitoring system according to claim 3, wherein in the step B, the actual output torque of the driving motor is obtained as follows: the safety monitor first calculates the motor driving current X motor bus. The value of the voltage X motor efficiency, and then according to the product and the motor speed through the look-up table to obtain the actual output torque of the corresponding drive motor at this time, wherein the motor efficiency is obtained by looking up the table.

The method for monitoring an electric vehicle safety monitoring system according to claim 3 or 4, wherein when the collision sensor detects a collision of the vehicle, the control collision switch is turned off, thereby closing the motor driver and disconnecting the power source of the power battery. Circuit.

6. A method for monitoring an electric vehicle safety monitoring system, comprising the steps of:

A: The safety monitor collects the signal of the accelerator pedal position sensor and the motor speed, and obtains the driver's request power by looking up the table;

B: Safety monitor collects motor drive current through motor current sensor, through motor bus voltage sensing Collecting the bus voltage of the motor, collecting the motor speed through the motor speed sensor, and obtaining the actual output power of the driving motor according to the motor driving current, the motor bus voltage and the motor speed collected by the motor;

C: The safety monitor compares the driver's request power with the actual output power of the drive motor. When the actual output power of the drive motor is greater than the driver's request power, the safety monitor turns off the motor driver and disconnects the power circuit of the power battery. .

7. The method of monitoring an electric vehicle safety monitoring system according to claim 6, wherein in the step B, the actual output power of the driving motor=motor driving current X motor bus voltage X motor efficiency, wherein the motor efficiency is passed Look up the table.

8. The method of monitoring an electric vehicle safety monitoring system according to claim 6 or 7, wherein when the collision sensor detects a collision of the vehicle, the control collision switch is turned off, thereby closing the motor driver and disconnecting the power source of the power battery. Circuit.