KR20090062859A - Danger avoidance device of hybrid vehicle as starting off and method for using it - Google Patents

Abstract

An apparatus for avoiding the danger in case of stalling of the engine of a hybrid vehicle, and its method are provided to prevent the rear ender by warning the rear vehicles automatically. An apparatus for avoiding the danger in case of stalling of the engine of a hybrid vehicle is provided with a hybrid control unit which comprises a stalling determination part which receives the transmission ratio and the car speed data from a transmission control unit and an engine control unit by the CAN communication to calculate the engine rotation number model value by dividing the car speed with the transmission ratio, receives the engine rotation number, the throttle signal and the maximum car speed limit logic activation variable from the engine control unit by the CAN communication, and receives the gear stage data from the transmission control unit to determine whether it is stalled or not; a motor torque control part which receives the car speed signal from the engine control unit by the CAN communication and is inputted with the stalling activation bit from the stalling determination part to give an order to a motor control unit so as to control the torque of an electric motor; and an emergency light flickering control part which receives the stalling signal from the stalling determination part to give an emergency light flickering order to a vehicle control module in case of the turn-off of stalling.

Description

Danger avoidance device of hybrid vehicle as starting off and method for using it}

The present invention relates to a risk avoiding device and a method using the same when the start-up of the hybrid vehicle, more specifically, it is possible to prevent the safety accident by the torque assist and emergency light flashing by the motor torque control when the engine start-off occurs while driving the hybrid vehicle. The present invention relates to a risk avoiding device and a method of using the same.

In general, a hybrid vehicle is a combination of two or more driving sources, such as applying an electric vehicle motor to an existing internal combustion engine or using a mixture of an internal combustion engine and a fuel cell. The part is recognized as an improved car. In particular, a hybrid vehicle having a structure in which an electric motor and an engine are directly connected is called a parallel hybrid vehicle.

However, when the engine is suddenly turned off during driving due to various reasons such as failure of the CKP sensor (crankshaft position sensor), injector failure, spark plug failure, etc. This causes shock.

In this state, since the vehicle travels inertia without obtaining rotational force from the engine, the vehicle speed decreases momentarily, and a safety accident such as a collision with a rear vehicle is likely to occur.

Therefore, it is necessary to provide a method for the prevention of safety accidents caused by sudden start-off during driving.

Disclosure of Invention An object of the present invention is to provide a risk avoiding device and a method of using the same when the hybrid vehicle is turned off when the engine is turned off while the hybrid vehicle is driven, which can prevent a safety accident caused by a torque assist and an emergency flashing by the motor torque control.

In order to achieve the above object, the present invention provides a hybrid vehicle having a transmission control unit for controlling a transmission, an engine control unit for controlling an engine, and a hybrid control unit for controlling an entire hybrid vehicle. Calculates an engine speed model value, which is a value obtained by receiving transmission ratio and vehicle speed data by CAN communication from the transmission control unit and the engine control unit, respectively, and dividing the vehicle speed by the transmission ratio, and calculating the engine by CAN communication. A start-off determination unit configured to receive an engine speed, a throttle signal, a maximum vehicle speed limit logic activation variable from a control unit, and receive gear gear data from the transmission control unit and perform logic to determine start-up off; A motor torque control unit that receives a vehicle speed signal from the engine control unit through CAN communication and receives a start off enable bit from the start off determination unit to command a motor control unit to control torque of an electric motor. ; And an emergency light blinking controller configured to receive a start-off signal from the start-off determination unit to give an emergency light blinking command to the vehicle body control module when the vehicle is turned off. The hybrid control unit includes the electric motor when the vehicle is started off while the hybrid vehicle is driven. It provides a risk avoidance device when the start-up of the hybrid vehicle, characterized in that to assist the torque required for driving the vehicle, and to prevent the safety accident by flashing the emergency light to notify the rear driving vehicle.

A method of avoiding danger when the hybrid vehicle is turned off by using the hazard avoiding device when starting the hybrid vehicle of claim 1, wherein the hybrid control unit comprises: receiving a gear ratio and a gear number from the transmission control unit; Receiving a vehicle speed, an engine speed, a throttle signal, and a maximum vehicle speed limit logic activation state from the engine control unit; Calculating the engine speed model value; Throttle opening angle θ P _{throttle with throttle} value Determining if greater than a value; θ _throttle value is P _throttle Determining whether the shift stage is the D stage if the value is larger than the value; Determining whether the maximum vehicle speed limit logic is in an inactive state when the shift stage is a D stage; And if the maximum vehicle speed limitation logic is in an inactive state, determining whether the current vehicle _speed is greater than the P _vehicle speed, which is a set value, and determining that the start-up is turned off under the condition that all of the above conditions are satisfied.

The hybrid control unit may include: calculating an engine speed aberration value that is a value obtained by subtracting a current engine speed value from the engine speed model value; Determining whether the _{engine speed} aberration value is greater than a P _{engine speed} value that is a set value; Storing the current vehicle speed when the engine speed difference value is greater than the P _{engine speed} value; Inputting a vehicle speed change amount within a set time that is a value obtained by subtracting the vehicle speed after T seconds from the current vehicle speed; Calculating the vehicle speed change amount; Determining whether the _{vehicle speed change amount} is greater than a P _{vehicle speed change amount} value; And if the vehicle speed change _amount is greater than the P _{vehicle speed change amount} value, determining that the _vehicle is turned off by generating a start-off state activation signal by determining that the vehicle is turned off and giving a control command to the motor control unit and the vehicle body control module.

The hybrid control unit may include the maximum to distinguish the engine torque cutoff phenomenon caused by the fuel cutoff according to the maximum vehicle speed limitation logic of the engine control unit during the driving of the hybrid vehicle and the engine torque cutoff phenomenon caused by the start-off during driving. It is characterized by receiving the vehicle speed limit logic activation variable.

As described above, the risk avoiding device and the method using the same according to an embodiment of the present invention, even if the engine start-off occurs while driving the hybrid vehicle, the engine speed model value and the measured engine speed By comparing and determining the torque of the electric motor, it is possible to safely move by generating the driving force to prevent the risk of accidents caused by shock and inertia driving caused by the low output of the engine torque.

At the same time, it can automatically flash the emergency light to warn the vehicle behind, preventing rear collision.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the risk avoiding device and the method using the same when the start-up of the hybrid vehicle according to an embodiment of the present invention.

1 is a schematic diagram illustrating a system for avoiding risk of starting a hybrid vehicle according to the present invention and a method using the same, and FIG. 2 is a device for avoiding risk of starting a hybrid vehicle according to the present invention and a method using the same. Is a flowchart illustrating control logic according to the above.

As shown in FIG. 1, the risk avoiding device and the method using the same when the hybrid vehicle is turned off are implemented according to logic in a hybrid control unit (HCU) 100 that controls the overall torque of the hybrid vehicle. In terms of torque control, the engine control unit (Engine Control Unit, ECU, not shown) that controls the engine torque, the Transmission Control Unit (TCU, not shown), which controls the transmission ratio of the transmission, and the electric motor A motor control unit (Motor Control Unit, MCU, 200) for controlling torque and a body control module (BCM, 300) for flashing an emergency light are provided and operated according to a control command of the hybrid control unit 100. .

The hybrid control unit 100 receives transmission ratio and gear stage data from the transmission control unit by CAN communication, and the vehicle speed, engine speed, throttle signal, and maximum vehicle speed from the engine control unit by CAN communication. The start-off determination unit 110 is provided to calculate the engine speed model value and receive the start-off determination logic by receiving the limit logic activation variable.

In addition, the hybrid control unit 100 receives a vehicle speed signal and a start-off activation bit transmitted from the start-off determination unit 110 to give a control command to the motor control unit 200 to control the torque of the electric motor. The motor torque control unit 120 and the emergency light blinking control unit 130 which receives the start off signal from the start off determination unit 110 and gives an emergency light blinking command to the vehicle body control module 300 are provided.

Signals are transmitted between the engine control unit and the transmission control unit and the hybrid control unit 100 as well as the motor control unit 200 and the vehicle body control module 300 by CAN communication with each other.

The hybrid control unit 100 determines the starting of the vehicle by the following logic.

As shown in FIG. 2, the transmission ratio and the gear stage are input from the transmission control unit (S100), and the vehicle speed, the engine speed, the throttle signal, and the maximum vehicle speed limit logic activation variable are input from the engine control unit (S110). The rotation speed model value is calculated (S120).

The engine speed model value is obtained by dividing the vehicle speed by the gear ratio, and the reason for receiving the maximum vehicle speed limit logic activation variable is that in the case of a hybrid vehicle, when the vehicle speed reaches the maximum vehicle speed by the maximum vehicle speed limit logic in the engine control unit, the fuel is forcibly This is because there is a function to cut off the engine torque by cutting off. Therefore, the maximum vehicle speed limit logic activation state is input to distinguish whether the engine torque is blocked by the maximum vehicle speed limit logic or the engine torque is blocked due to a sudden start-off during driving.

When the vehicle is running, the engine speed and the vehicle speed have the following correlation in consideration of the transmission ratio of the transmission.

(1) Vehicle speed = engine speed × speed ratio × K

(K is fixed value except transmission ratio from crankshaft to wheel)

That is, since the transmission is fastened and is expressed as a ratio proportional to the speed ratio between the vehicle speed and the engine speed, this is summarized as follows from the engine speed.

(2) Engine speed = vehicle speed ÷ (speed ratio × K)

Therefore, the start-off determination unit 110 calculates the engine speed model value using equation (2).

The throttle opening angle θ _throttle value is then set to P _throttle Determine whether the value is greater than the value (S130), the θ _throttle value is P _throttle If greater than the value, it is determined whether the shift stage is the D stage (S140). If the shift stage is the D stage, it is determined whether the maximum vehicle speed limit logic is in an inactive state (S150). It is determined whether the _{vehicle speed} is greater than the P _vehicle speed which is a set value (S160).

The hybrid control unit 100 determines that the start-up is turned off under the condition that all of these conditions are basically satisfied. First, the engine speed aberration value, which is a value obtained by subtracting the current engine speed value from the engine speed model value, is calculated ( S170).

Then, it is determined whether the engine speed aberration value is greater than the P _{engine speed} value which is a set value (S180), and when the engine speed aberration value is larger than the P _{engine speed} value, the current vehicle speed is stored (S190). The value of P _{engine speed} , which is a set value, is to arbitrarily set the speed at which the risk of an accident occurs during sudden start-off during the operation of a hybrid vehicle, _{so it} is _suitable for the driving conditions of the vehicle such as a highway or a city road. Adjustable

Next, the vehicle speed change amount is input within the set time which is the value obtained by subtracting the vehicle speed after T seconds from the current vehicle speed (S200), and the vehicle speed change amount is calculated (S210), and it is determined whether the vehicle speed change _amount is greater than the set value of the P _{vehicle speed change amount} (S220). When the vehicle speed change _amount is greater than the P _{vehicle speed change amount} , it is determined that the start-up is off and generates a start-off state activation signal (S230).

When the start-up is determined to fail safety is performed in two ways.

The start off activation bit signal generated by the start off determination unit 110 is transmitted to the motor torque control unit 120, and the motor torque control unit 120 commands the motor control unit 200 to generate the torque. .

By driving an electric motor directly connected to the engine to assist the torque member of the engine, the speed of the vehicle is not drastically reduced or stopped so that an emergency driving force is generated for the driver to move away from the roadway to a safe place.

That is, the hybrid control unit 100 calculates a motor torque demand amount for the current vehicle speed in the engine start-off situation and commands the motor control unit 200, and the required motor torque value for the vehicle speed is expressed as a linear function ( Motor torque command = f (vehicle speed)).

In addition, the start-off activation signal is transmitted to the emergency light flashing control unit 130 to be commanded to the vehicle body control module 300 so that the emergency light flashes, and can send a warning to the vehicle running behind by the automatic lighting of the emergency light. A collision accident by a vehicle can be prevented.

Meanwhile, the present invention is not limited to the above-described embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention as claimed in the claims. Of course, such changes will fall within the scope of the claims set forth.

1 is a schematic diagram showing a system configuration according to the risk avoiding device and the method using the same when the start-up of the hybrid vehicle of the present invention.

Figure 2 is a flow chart illustrating a control logic according to the risk avoiding device and the method using the same when the start-up of the hybrid vehicle of the present invention.

* Explanation of symbols for the main parts of the drawings

100: hybrid control unit (HCU) 110: start-off determination unit

120: motor torque control unit 130: emergency light flashing control unit

200: motor control unit (MCU) 300: body control module (BCM)

Claims (4)

In a hybrid vehicle provided with a transmission control unit for controlling a transmission, an engine control unit for controlling an engine, and a hybrid control unit 100 for controlling the entire hybrid vehicle, The hybrid control unit 100, The engine speed model value, which is the value obtained by dividing the vehicle speed by the transmission ratio, is received by transmission of the gear ratio and vehicle speed data from the transmission control unit and the engine control unit by CAN communication, respectively, and the engine control unit by CAN communication. A start-off determination unit 110 configured to receive an engine speed, a throttle signal, a maximum vehicle speed limit logic activation variable, and receive a gear stage data from the transmission control unit to perform logic for determining start-off; The CAN control unit 200 receives a vehicle speed signal from the engine control unit through CAN communication, receives a start-off activation bit from the start-off determination unit 110, and controls the torque of the electric motor. A motor torque control unit 120 for giving a command; And Receiving the start off signal from the start off determination unit 110 is configured to include an emergency light flashing control unit 130 to give an emergency light flashing command to the vehicle body control module 300 when the start off, The hybrid control unit 100 operates the electric motor when the vehicle is turned off during driving of the hybrid vehicle to assist torque required for driving the vehicle, and flashes an emergency light to notify the rear driving vehicle to prevent a safety accident. Device for avoiding danger when the hybrid vehicle is turned off. As a risk avoidance method for starting off of a hybrid vehicle using the risk avoiding device when starting the hybrid vehicle of claim 1, The hybrid control unit 100, Receiving a gear ratio and a gear stage from the transmission control unit (S100); Receiving an input of a vehicle speed, an engine speed, a throttle signal, and a maximum vehicle speed limit logic activation state from the engine control unit (S110); Calculating the engine speed model value (S120); Throttle opening angle θ P _{throttle with throttle} value Determining whether the value is greater than the value (S130); θ _throttle value is P _throttle Determining whether the shift stage is the D stage if it is greater than the value (S140); Determining whether the maximum vehicle speed limit logic is in an inactive state when the shift stage is the D stage (S150); And When the maximum vehicle speed limit logic is in an inactive state, a step of determining whether the current vehicle _speed is greater than the set value P _{vehicle speed} (S160) is performed. Risk avoidance The method of claim 2, The hybrid control unit 100, Calculating an engine speed aberration value that is a value obtained by subtracting a current engine speed value from the engine speed model value (S170); Determining whether the _{engine speed} aberration value is greater than a P _{engine speed} value that is a set value (S180); Storing the current vehicle speed when the engine speed difference value is greater than the P _{engine speed} value (S190); Inputting a vehicle speed change amount within a set time which is a value obtained by subtracting the vehicle speed after the elapse of T seconds from the current vehicle speed (S200); Calculating the vehicle speed change amount (S210); Determining whether the _{vehicle speed change amount} is greater than a P _{vehicle speed change amount} value (S220); And When the vehicle speed change _amount is greater than the P _{vehicle speed change amount} value, it is determined that the start-up is turned off and the start-off state activation signal is generated (S230). A risk avoidance method for starting a hybrid car, characterized by issuing commands. The method of claim 1, The hybrid control unit 100 distinguishes between an engine torque cutoff phenomenon caused by fuel cutoff according to a maximum vehicle speed limitation logic of an engine control unit during driving of the hybrid vehicle, and an engine torque cutoff phenomenon caused by a start-off while driving. To avoid the risk of starting the hybrid vehicle, characterized in that receiving the maximum vehicle speed limit logic activation variable.

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