Electric vehicle sudden acceleration control system

Abstract

The present invention relates to a sudden acceleration control system for an electric vehicle, and the sudden acceleration control system for an electric vehicle includes: a sudden acceleration detection unit that detects the vehicle speed from an acceleration sensor, compares it with a preset speed, and determines that the vehicle is accelerating suddenly if the speed exceeds the preset speed; a battery module including a battery pack configured with a plurality of battery cells and a power relay that controls power supply to the battery pack or power supply from the battery pack to an external device; and a drive motor that receives power from the battery module and transmits drive force to wheels of the vehicle; and The device includes a contactor that connects or disconnects the battery module and the drive motor, and an emergency switch that operates the contactor, and when a user or the sudden acceleration detection unit detects a sudden acceleration, the user operates the emergency switch to turn off, cutting off power with the contactor and interrupting power supplied to the drive motor. When the driver directly presses the emergency control button during a sudden start, the high-voltage DC (Direct Current) contactor is released, controlling the AC drive motor to eliminate driving force while preventing sudden braking due to movement caused by remaining inertia, greatly improving safety and allowing the steering and braking devices other than the AC drive motor to operate normally. This results in extremely safe and efficient results during sudden starts. Furthermore, even if the steering and braking devices become inoperable due to the impact of an accident, it is possible to prevent major accidents such as the fear of the user caused by sudden acceleration due to sudden starts, a chain reaction of rear-end collisions, or crashing into nearby residents due to sudden acceleration, thereby improving safety.

Description

[Technical Field]

[0001] The present invention relates to a sudden acceleration control system for an electric vehicle, and more particularly to a sudden acceleration control system for an electric vehicle that allows a driver to control sudden acceleration when the electric vehicle suddenly accelerates. [Background technology]

[0002] In recent years, as the climate crisis caused by climate change has become more serious, interest in addressing environmental pollution and taking environmentally friendly measures has grown. As a result, countries around the world have tightened regulations on internal combustion engine vehicles, while interest in environmentally friendly vehicles has increased.

[0003] Environmentally friendly vehicles, such as hybrid cars and electric cars, are rapidly becoming popular, and the market for electric cars in particular is growing rapidly as they are supported by government policies as completely environmentally friendly vehicles.

[0004] The widespread use and rapid growth of electric vehicles has given rise to various problems, particularly accidents caused by sudden acceleration, which can result in personal and property damage.

[0005] Sudden acceleration of electric vehicles can be caused by a variety of factors, including driver error, unexplained vehicle defects, and sudden acceleration due to a collision.

[0006] However, due to the characteristics of the AC drive motors used in electric vehicles, when the vehicle accelerates suddenly, the speed increases rapidly and reaches its maximum speed, making it impossible to brake, steer, or turn off the power switch.Furthermore, once sudden acceleration has already occurred, the software is unable to control the sudden start, which can lead to accidents.

[0007] In addition, because electric vehicles suddenly accelerate, even if instantaneous danger is detected, it is not possible to respond. When a sudden acceleration occurs, it can result in numerous injuries and property damage. Furthermore, because it is difficult to identify the cause of the sudden acceleration, it is difficult to provide relief to the victims. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Republic of Korea Patent Publication No. 10-2021-0057895 Summary of the Invention [Problem to be solved by the invention]

[0009] The problem to be solved by the present invention is to provide a sudden start control system for an electric vehicle that can reduce human and property damage by controlling sudden starts even when rapid acceleration is occurring using a combination of physical means and software. [Means for solving the problem]

[0010] The present invention relates to a sudden acceleration control system for an electric vehicle, which includes: a sudden acceleration detection unit that detects the vehicle speed from an acceleration sensor, compares it with a preset speed, and determines that the vehicle is accelerating suddenly if the speed exceeds the set speed; a battery module including a battery pack composed of a plurality of battery cells and a power relay that controls power supply to the battery pack or power supply from the battery pack to the outside; a drive motor that receives power from the battery module and transmits driving force to the wheels of the vehicle; and sudden acceleration control means that includes a contactor that connects or disconnects the connection between the battery module and the drive motor, and an emergency switch that operates the contactor, and when a user or the sudden acceleration detection unit detects a sudden acceleration, the user operates the emergency switch to off, cutting off power at the contactor and stopping the power supplied to the drive motor.

[0011] The power supply also includes a junction box provided between the power relay and the drive motor, and an inverter provided between the junction box and the drive motor,

[0012] the contactor includes a first coil and a second coil that generate a magnetic force therein from externally supplied power, contact terminals connected to the first coil and the second coil, and a constant power supply unit that supplies power to the first coil and the second coil, and is configured as a bipolar contact type between the power relay and the junction box; A magnetic force is selectively generated in the first coil and the second coil depending on the on / off state of the emergency switch, and the first connection line connected to the power relay and the second connection line connected to the junction box can be energized and disconnected through the contact terminals, respectively.

[0013] The power supply may further include a regenerative braking means for supplying power to the power relay by causing the first coil and the second coil to contact the contact terminals when the emergency switch is in an on state, via the drive motor, the inverter, and the junction box, and then supplying power from the power relay to the battery module to charge the battery module.

[0014] The battery module may also include a rapid charger that rapidly charges the battery module when the emergency switch is in an on state by bringing the first coil and the second coil into contact with the contact terminal, and rapid charging means that supplies power to the power relay by passing it through the junction box and then supplies it from the power relay to the battery module, thereby charging the battery module.

[0015] The system may also include a slow charger that converts power into direct current (DC) when the emergency switch is in an on state by causing the first coil and the second coil to contact the contact terminal, a low voltage DC converter (LDC) that converts high voltage to low voltage, a slow charger relay (OBC relay) connected to the slow charger between the contactor and the junction box, and a slow charger means that passes power through the junction box to provide it to the power relay, and then supplies it from the power relay to the battery module to charge the battery module. [Effects of the Invention]

[0016] The present invention relates to a sudden acceleration control system for an electric vehicle, and can achieve the following effects.

[0017] First, according to the electric vehicle sudden acceleration control system of the present invention, when the driver presses the emergency control button during sudden acceleration, the high-voltage DC (Direct Current) contactor is released, causing a loss of driving force, but at the same time, the remaining inertial movement can prevent sudden braking, thereby significantly improving safety.

[0018] Secondly, according to the electric vehicle sudden acceleration control system of the present invention, the steering device and braking device of the AC drive motor operate normally, making it possible to steer during sudden acceleration, thereby improving safety and efficiency.

[0019] Thirdly, the electric vehicle sudden acceleration control system of the present invention has the effect of improving safety by preventing large-scale accidents such as sudden acceleration that can frighten the user or cause a chain reaction of rear-end collisions, or crashing into people nearby due to sudden acceleration, when the steering device and braking device become inoperable due to the impact of an accident.

[0020] The effects of the present invention are not limited to those described above, and other effects not mentioned can also be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic diagram showing an embodiment of a drive motor control system for an electric vehicle according to the present invention; [Figure 2] 1 is a block diagram showing an embodiment of a sudden acceleration control system for an electric vehicle according to the present invention; [Figure 3] FIG. 3 is an enlarged view of a part of FIG. 2. [Figure 4] FIG. 2 is a block diagram showing the operation during running (discharging) according to the present invention. [Figure 5] FIG. 10 is a block diagram showing the operation of the present invention in a state where the emergency switch is turned off during sudden start. [Figure 6] FIG. 2 is a block diagram showing the operation during braking according to the present invention. [Figure 7] FIG. 3 is a block diagram showing the operation during rapid charging according to the present invention. [Figure 8] FIG. 2 is a block diagram showing the operation during slow charging according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention can be realized in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted to clearly explain the present invention, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0023] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings.

[0024] In the present invention, "above" means being located above or below the target member, and does not necessarily mean being located at the top with respect to the direction of gravity.

[0025] Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by these terms. These terms are used only to distinguish one component from another.

[0026] For example, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component, without departing from the scope of the present invention. The term "and / or" means the inclusion of any combination of the associated listed items or any of the associated listed items.

[0027] When a component is described as being "coupled" or "connected" to another component, it should be understood that this includes not only when the component is directly coupled or connected to the other component, but also when there are other components in between.

[0028] On the other hand, when a component is described as being "directly coupled" or "directly connected" to another component, it should be understood to mean that there are no other components in between.

[0029] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. The singular expressions include the plural forms unless the context clearly indicates otherwise.

[0030] In this application, the terms "comprise" or "have" should be understood to specify the presence of a stated feature, value, step, operation, component, part, or combination thereof, but not to preclude the possibility that one or more other features, values, steps, operations, components, parts, or combinations thereof may be added.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0032] As with terms defined in commonly used dictionaries, terms herein should be interpreted in a manner consistent with the meaning used in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0033] Furthermore, throughout the specification, when a part is described as being "connected" to another part, this includes not only "directly connected" cases, but also "indirectly connected" cases with other components in between.

[0034] FIG. 1 is a schematic diagram showing an embodiment of a drive motor control system for an electric vehicle according to the present invention, and FIG. 2 is a block diagram showing an embodiment of a sudden acceleration control system for an electric vehicle according to the present invention.

[0035] FIG. 3 is a partially enlarged view showing a part of FIG. 2, and FIG. 4 is a block diagram showing the operation during running (discharging) in the present invention.

[0036] FIG. 5 is a block diagram showing the operation of the present invention when the emergency switch is turned off during sudden acceleration, and FIG. 6 is a block diagram showing the operation of the present invention during braking.

[0037] FIG. 7 is a block diagram showing the operation of the present invention during fast charging, and FIG. 8 is a block diagram showing the operation of the present invention during slow charging.

[0038] Referring to FIGS. 1 to 3, an embodiment of the sudden acceleration control system for an electric vehicle according to the present invention will be described. The sudden acceleration control system for an electric vehicle includes a sudden acceleration detection unit (not assigned a drawing number) that detects the vehicle speed from an acceleration sensor, compares it with a preset speed, and determines that the vehicle is starting suddenly if the speed exceeds the set speed. A battery module (10) including a battery pack (11) composed of a plurality of battery cells and a power relay (12) that controls the supply of power to the battery pack (11) or the supply of power from the battery pack (11) to the outside. The vehicle includes a drive motor (20) that receives power from the battery module (10) and transmits driving force to tires (21) of the vehicle, a contactor (53) that connects or disconnects the battery module (10) and the drive motor (20), and an emergency switch (52) that activates the contactor (53), and includes a sudden acceleration control means that, when a user or a sudden acceleration detection unit detects a sudden acceleration, the user turns off the emergency switch (52) to cut off power with the contactor (53) and interrupt the power supplied to the drive motor (20).

[0039] In a vehicle control device, the steering and braking of an electric vehicle (vehicle) can be controlled by a vehicle control system.

[0040] The sudden acceleration detection unit compares the vehicle speed detected by the acceleration sensor with a preset speed, and determines that the vehicle is suddenly accelerating if the speed exceeds the preset speed. Such sudden acceleration detection units are already known technology, so detailed description thereof will be omitted.

[0041] The battery module (10) can include a battery pack (11) in which multiple high-voltage batteries are connected to each other, and a power relay (12) that stably supplies or cuts off battery power between the battery pack (11) and an inverter (40) described later.

[0042] The power relay (12) is a power relay assembly that is installed inside electric vehicles and hybrid vehicles that generate power using batteries. The power relay is located between the battery pack (11) and the inverter (40) and is a module consisting of relays, resistors, etc. It plays a role in stably supplying or cutting off battery power to the vehicle's power system and protecting the vehicle's power system when a fault current occurs.

[0043] The drive motor (20) is an AC drive motor and can be included in the drive means (20, 21) that receives power from the battery module (10) and transmits driving force to the vehicle's drive unit, i.e., tires (21), to drive the electric vehicle.

[0044] Here, the drive motor (20) is used in an electric vehicle to transmit the driving force of either a rear AC drive motor or a front AC drive motor, and in some cases, dual AC drive motors are used, and the capacity difference between the main AC drive motor and the secondary AC drive motor may be configured to be approximately one-fourth.

[0045] In addition, the drive motors may be arranged in the rear with the main AC drive motor at the front, or vice versa, with the same numerical values, stages, components, parts, or combinations thereof. The general operation of such drive motors is well known, and therefore will not be described in detail.

[0046] The junction box (30) is provided between the power relay (12) and the drive motor (20) to supply or cut off the power supplied from the battery module (10) to the vehicle, and is generally configured as a high-voltage compatible junction box.

[0047] The junction box (30) can supply high voltage power when the inverter (40) is required to operate, and can cut off the high voltage power when the inverter (40) is not in use.

[0048] The inverter (40) is provided between the junction box (30) and the drive motor (20), and converts the phase of the high-voltage power supplied from the battery module (10) to drive the drive motor (20).

[0049] The inverter (40) can include a DC link including a battery module and a plurality of series-connected resistor elements, and a plurality of series-connected power semiconductor pairs that switch and convert the DC power supplied from the battery module into AC power and transmit the converted AC power to the motor.

[0050] The sudden start control means (50) can cut off power using the contactor (53) by the user turning off the emergency switch (52), thereby interrupting the supply of power to the drive motor (20). The sudden start control means can include a constant power supply unit (51), the emergency switch (52), and the contactor (53).

[0051] The continuous power supply unit 51 is composed of a 12V battery and can supply power to the contactor 53. An emergency switch 52 can be provided between the continuous power supply unit 51 and the contactor 53 to connect or disconnect the power supply.

[0052] The emergency switch (52) is provided inside the vehicle, and can be turned on / off by a user to energize or cut off the current supplied from the constant power supply unit (51) to the contactor (53).

[0053] The emergency switch (52) is in an on state under normal circumstances, i.e., circumstances other than sudden acceleration, and can pass power supplied from the constant power supply unit (51) to the contactor (53).

[0054] The emergency switch (52) may include an energizing terminal (523) for energizing and deenergizing between a first contact point (521) connected to the constant power supply unit (51) and a second contact point (522) connected to a first coil (531) of the contactor (53).

[0055] The continuous power supply unit (51) is connected to the first contact point (521) and also to the second coil (532), and when the emergency switch (52) brings the current-carrying terminal (523) into contact with the first contact point (521) and the second contact point (522), the power in the continuous power supply unit (51) can be supplied to the contactor (53).

[0056] Conversely, if the user recognizes that a sudden start has occurred, or if the sudden start detection unit detects and notifies the user, the user can turn off the emergency switch (52) and cut off the power supplied from the constant power supply unit (51), thereby cutting off the power supplied to the contactor (53).

[0057] The contactor (53) includes a first coil (531) and a second coil (532) that generate magnetic force internally using power supplied from the outside, and contact terminals (535) connected to the first coil (531) and the second coil (532), and power can be constantly supplied to the first coil (531) and the second coil (532) from the power supply unit (51).

[0058] The contactor (53) selectively generates a magnetic force in the first coil (531) and the second coil (532) depending on the on / off state of the emergency switch (52), and the first connection line (533) connected to the power relay (12) and the second connection line (534) connected to the junction box (30) can be energized and disconnected via the contact terminals (535), respectively.

[0059] The contactor 53 may be configured as a bipolar contact type between the power relay 12 and the junction box 30. The contactor 53 is a high-voltage DC contactor with a rated voltage of 1,000 VDC and a rated current of 250 A to 300 A, which is advantageous for fast charging and can prevent damage to high-voltage cables and high-voltage equipment, thereby improving safety.

[0060] For example, referring to FIG. 4, the electric vehicle according to the present invention is shown in a normal running state. In the normal running state, the emergency switch (52) is in an on state, and power is supplied from the constant power supply unit (51) to the contactor (53).

[0061] When power is supplied to the first coil (531) and the second coil (532) inside the contactor (53), a magnetic force is generated in the first coil (531) and the second coil (532), and the contact terminal (535) is brought into contact with the first connection line (533) and the second connection line (534). As a result, power can be supplied from the battery pack (11) to the driving means (20, 21) through the junction box (30) by the contactor (53).

[0062] In this case, during normal driving, the power of the battery pack (11) passes through the power relay (12), and the stabilized power passes through the contactor (53) and is sent to the junction box (30) and the inverter (40).

[0063] Then, when the power converted from direct current (DC) to three-phase alternating current (AC) by the inverter (40) is transmitted to the driving means (20, 21), i.e., the driving motor (20), the power is converted into kinetic energy in the driving motor (20) and can be supplied to the tires (21).

[0064] This allows all functions to be performed smoothly during the basic driving state of the electric vehicle, and the bipolar contact design of the contactor (53) allows discharging (driving) and charging even when charging while driving using regenerative braking.

[0065] Meanwhile, referring to FIG. 5, the emergency control for sudden acceleration in the electric vehicle sudden acceleration control system of the present invention will be described. When a sudden acceleration occurs during normal driving or when starting off after stopping, the user can manually turn off the emergency switch (52) to activate the contactor (53).

[0066] When the user turns off the emergency switch (52), the power supplied from the constant power supply unit (51) to the contactor (53) is no longer supplied between the first contact point (521) and the second contact point (522) as the current-carrying terminal (523) is released from contact.

[0067] Furthermore, since power, i.e., power supply, is no longer supplied to the contactor (53), magnetic force is no longer generated in the first coil (531) and the second coil (532) inside the contactor (53), and the contact terminal (535) is no longer in contact with (disconnected from) the first connection line (533) and the second connection line (534). As a result, the power supplied from the power relay (12) to the junction box (30) can be cut off before it reaches the junction box (30).

[0068] Furthermore, since the power source that had been supplied to the drive motor (20) is lost, the drive motor (20) no longer generates a driving force.

[0069] As a result, the power supplied as direct current (DC) is cut off before it is converted into three-phase alternating current (AC), thereby preventing failures in the inverter (40) and drive motor (20) and improving their durability.

[0070] Furthermore, since the drive motor 20 loses its driving force and the vehicle moves forward only by inertia due to acceleration, sudden acceleration due to sudden start can be prevented, improving safety. In this case, the brake and steering devices can be used, allowing the user to safely stop the vehicle and brake, further improving safety.

[0071] Here, the emergency switch (52) can be provided so as to be usable from the driver's seat inside the vehicle, and by installing it on the left side of the steering wheel together with a protective cover, it is possible to prevent erroneous operation in daily life and to improve safety by enabling it to be used quickly in the event of sudden acceleration.

[0072] The quick charger (60) is a device for quickly charging the battery module, providing externally supplied power to the junction box (30), and quickly charging the electric vehicle with high efficiency using a voltage of 800V, which is the voltage level required for the battery module (10).

[0073] The slow charger (70) is an environmentally friendly charger installed inside a vehicle, which converts power supplied from a commercial alternating current (AC) power system into direct current (DC) and can control charging according to the characteristics of the battery (300).

[0074] The slow charger (70) is a device that receives power (e.g., AC power) from an electric vehicle supply equipment (EVSE) and charges the high-voltage battery through a portable charging cable (ICCB, In-Cable Control Box).

[0075] The slow charger (70) is connected between the contactor (53) and the junction box (30) and can supply externally supplied power to the battery module (10). The slow charger 70 performs charging after its output terminals are connected to the battery module 10. When the slow charger 70 does not perform charging, the slow charger 70 cuts off the high voltage using a relay for the safety of the user.

[0076] Meanwhile, the output terminal protection method of the slow charger (70) is such that the output terminal protection device of the slow charger (OBC, On Board Charger) compares the voltage difference between the output voltage of the slow charger (70) and the voltage of the battery with a threshold value, and if the voltage difference is equal to or less than the threshold value, the slow charger relay (OBC Relay) is activated to connect the slow charger (70) and the battery module (10).

[0077] After the slow charger (70) and the battery module (10) are connected, the slow charger (70) can charge the battery module (10).

[0078] In addition, the slow charger 70 may be equipped with a low DC-DC converter (LDC) that converts high voltage into low voltage of 12V and supplies power to the low voltage battery and various electronic components of the vehicle.

[0079] The LDC and slow charger relay are arranged between the contactor 53 and the junction box 30 to connect the slow charger 70, and can be configured as a voltage protection means 80 for protecting the power supplied to the battery module 10 through the slow charger 70.

[0080] Meanwhile, referring to FIG. 6, the regenerative braking means of the present invention will be described. When the emergency switch (52) is turned on, the first coil (531) and the second coil (532) contact the contact terminal (535) to provide power to the power relay (12) via the drive motor (20), inverter (40), and junction box (30), and the power is then supplied from the power relay (12) to the battery pack (11) to charge the battery pack.

[0081] On the other hand, the regenerative braking means using the contactor (53) has a bipolar contact design, which has the effect of enabling discharging (driving) and charging during charging while driving.

[0082] Meanwhile, referring to FIG. 7, the quick charging means of the present invention will be described. When the emergency switch (52) is turned on, the first coil (531) and the second coil (532) come into contact with the contact terminal (535), and power is supplied to the power relay (12) through the quick charger (60) and the junction box (30) to be supplied to the power relay (12). Power is then supplied from the power relay (12) to the battery pack (11), thereby quick charging the battery pack (11).

[0083] At this time, a high voltage may flow during rapid charging, for example, a voltage of 800 VDC may flow after being boosted from 400 VDC. As a result, the contactor (53) has a rated voltage of 1,000 VDC and a rated current of 250 A to 300 A, which prevents damage or breakdown of high-voltage cables and high-voltage devices, thereby further improving safety.

[0084] Next, referring to FIG. 8, the slow charging means of the present invention will be described. When the first coil (531) and the second coil (532) contact the contact terminals (535) when the emergency switch (52) is in an on state, the slow charging means supplies power to the power relay (12) via the slow charger (70), a low voltage DC-DC converter (LDC) that reduces the output voltage, an on-board slow charger (OBC) that is built into the vehicle while the vehicle is running or parked and receives power from an external power source to charge the battery, and a junction box (30). The power relay (12) supplies power to the battery pack (11) to charge the battery pack (11).

[0085] Such on-board slow chargers can be used to reduce charging times for electric vehicles, improving convenience and improving vehicle performance and efficiency.

[0086] According to the electric vehicle sudden start control assist device and control method of the present invention, when the driver directly presses the emergency control button during sudden start, the high-voltage DC (direct current) contactor is switched off. As a result, the AC drive motor loses its driving force, and sudden braking due to the remaining inertia can be prevented, greatly improving safety. Furthermore, the steering and braking devices other than the AC drive motor can operate normally. Therefore, very safe and efficient results can be obtained during sudden start.

[0087] Furthermore, even if the impact of an accident causes the steering and braking devices to become inoperable, it is possible to prevent large-scale accidents such as the fear of the user caused by sudden acceleration due to a sudden start, a chain reaction of rear-end collisions, or crashing into nearby residents due to sudden acceleration, thereby improving safety.

[0088] The above description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not limiting. For example, each component described in a single form can be implemented in a distributed form, and similarly, each component described in a distributed form can be implemented in a combined form.

[0089] The scope of the present invention is defined by the claims that follow, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

[0090] Although the above-mentioned preferred embodiments of the present invention have been described, the present invention is not limited thereto, and various modifications can be made within the scope of the claims, the detailed description of the invention, and the accompanying drawings, and it is of course understood that these modifications also fall within the scope of the present invention. [Explanation of symbols]

[0091] 10: Battery module 20: Drive motor 30: Junction box 40: Inverter 50: Emergency stop means 60: Quick charger 70: Slow charger

Claims

1. a sudden start detection unit that detects the vehicle speed from an acceleration sensor, compares it with a preset speed, and determines that the vehicle is starting suddenly if the speed exceeds the preset speed; and a battery module including a battery pack configured with a plurality of battery cells and a power relay that controls power supply to the battery pack or power supply from the battery pack to an external device; and a drive motor that receives power from the battery module and transmits driving force to wheels of the vehicle; and a contactor that connects or disconnects the battery module and the drive motor, and an emergency switch that operates the contactor; wherein, when a user or the sudden start detection unit detects a sudden start, the user operates the emergency switch to turn off, causing the contactor to cut off power and interrupt the power supplied to the drive motor; a junction box provided between the power relay and the drive motor; and an inverter provided between the junction box and the drive motor; the contactor includes a first coil and a second coil that generate a magnetic force therein by power supplied from an external source, contact terminals connected to the first coil and the second coil, and a constant power supply unit that supplies power to the first coil and the second coil, and is configured as a bipolar contact type between the power relay and the junction box; a first connection line connected to the power relay and a second connection line connected to the junction box can be energized and disconnected via the contact terminals, respectively.

2. 2. The electric vehicle sudden acceleration control system according to claim 1, further comprising: regenerative braking means for supplying power to the power relay through the drive motor, the inverter, and the junction box when the emergency switch is in an on state, causing the first coil and the second coil to contact the contact terminals, and supplying power from the power relay to the battery module to charge the battery module.

3. 2. The electric vehicle sudden acceleration control system according to claim 1, further comprising: a rapid charger that rapidly charges the battery module when the emergency switch is in an on state, with the first coil and the second coil contacting the contact terminal; and rapid charging means that supplies power through the junction box to the power relay, and supplies power from the power relay to the battery module, thereby charging the battery module.

4. 2. The electric vehicle sudden acceleration control system according to claim 1, further comprising: a slow charger that converts power into direct current (DC) when the emergency switch is in an on state, by causing the first coil and the second coil to come into contact with the contact terminal; a low voltage DC converter (LDC) that converts high voltage to a low voltage of 12 V and supplies power to a low voltage battery and various electronic components of the vehicle; a slow charger relay (OBC relay) connected between the contactor and the junction box; and slow charging means that supplies power through the junction box to the power relay, and then supplies power from the power relay to the battery module to charge the battery module.

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