KR100610430B1 - Idle stop and go control method of 42V belt-driven IGS vehicle using steering angle sensor - Google Patents

Abstract

The present invention relates to an idle stop / high control method of an intermittent driving vehicle using a steering angle sensor, and to avoid a driver's accident such as rushing, approaching collision of another vehicle, or rolling of the vehicle while the vehicle is idle. When the steering wheel is suddenly rotated, the control unit is configured to detect the sudden rotation operation state of the steering wheel through the steering angle sensor to automatically release the engine's idle stop state (engine start), so that the driver suddenly The present invention relates to an idle stop / high control method for an intermittent driving vehicle using a steering angle sensor that enables the driver to cope with a sudden situation by operating the steering wheel after the idle stop state is automatically released by only steering wheel operation. .

Intermittent Operation, 42V, Belt Driven, IGS, Idle Stop, Steering Angle Sensor, Control Unit, Improved Safety, Dual Power System, Hybrid Vehicle

Description

Idle stop and go control method of 42V belt-driven IGS vehicle using steering angle sensor             

1 schematically shows a typical vehicle configuration employing a 42V belt driven IGS,

2 is a view schematically showing a steering angle sensor used in the present invention,

3 is a view showing the shape of a pulse signal output from the steering angle sensor of FIG.

4 is a view showing an example of comparing the output of the pulse signal according to the operating state of the steering wheel,

5 is a flowchart showing an idle stop / high control method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: steering wheel 2: steering shaft

10 engine 20 transmission

31: IGS 32: 36V Battery

33: BMS 34: Inverter

35: DC / DC converter 36: MCU

37: 12V battery 41: slit disk

LED: Light Emitting Diode TP: Phototransistor

The present invention relates to an idle stop / high control method of an intermittent driving vehicle using a steering angle sensor, and to avoid a driver's accident such as rushing, approaching collision of another vehicle, or rolling of the vehicle while the vehicle is idle. When the steering wheel is suddenly rotated, the control unit is configured to detect the sudden rotation operation state of the steering wheel through the steering angle sensor to automatically release the engine's idle stop state (engine start), so that the driver suddenly The present invention relates to an idle stop / high control method for an intermittent driving vehicle using a steering angle sensor that enables the driver to cope with a sudden situation by operating the steering wheel after the idle stop state is automatically released by only steering wheel operation. .

The electric device of the car can be compared to the nervous system of a person, and the electric device can be exerted in its excellent performance only when the electric device is normally operated.

Engine electric devices (starters, ignition devices, charging devices) and lighting devices are generally used as electric devices in automobiles. However, as the vehicle is more electronically controlled, most systems including chassis electric devices are becoming more electronic. .

On the other hand, various electric appliances such as lamps, audio, heaters, air conditioners, etc. installed in a vehicle are supplied with power from a battery when the vehicle is stopped and from a generator when the vehicle is stopped. Power generation capacity is being used.

However, in recent years, with the development of the information technology industry, various new technologies (motor-driven steering devices, the Internet, etc.) aiming at increasing the convenience of automobiles have been applied to vehicles. It is expected to continue.

Therefore, the existing 14V power supply system is unable to supply enough power to the vehicle to which the new technology is applied, and therefore, it is required to introduce a power supply system capable of supplying more power. System.

In other words, the power supply system of automobiles is doubled to 14V / 42V, and the power efficiency is increased by supplying the voltage of 42V to the clocks and motors requiring high power, and the low-power devices use the existing 14V power system. .

Referring to FIG. 1, a dual power supply system of an automobile includes an integrated generator starter (IGS) having a starter function and generating high power, and controlling the amount of power generation and the starter function of the IGS 31. A motor control unit (MCU) 36 that performs general control of driving IGS, etc., a 36V battery 32 that stores power generated from a power generation system of a 42V IGS 31, and controls the 36V battery 32. Battery management system (BMS) 33 to manage, various high-power devices (not shown) equipped with a 42V motor driven by the 36V battery 32, converts the voltage from the 36V battery 32 to DC / DC A bidirectional DC / DC converter 35, a 12V battery 37 that charges the voltage converted from the DC / DC converter 35, a low power device (not shown) driven by the 12V battery 37 voltage, and the like. It is made to include.

Among the various components of the dual power supply system, the IGS 31 replaces the existing alternator and starter, and as the starter, when the initial start-up receives a 42V power supplied from the 36V battery 32 under the control of the MCU 36. In operation, the engine operates as an alternator during normal operation of the engine.

The 42V power generated from the IGS 31 is stored in the 36V battery 32. The power of the 36V battery 32 is stored in the water pump, the electric air conditioner compressor, the fuel pump, and the radiator with the 42V motor applied under the control of the MCU 36. Drives high-power devices such as fans, wipers, condenser fans, and power windows.

Current 42V system vehicles can be classified into direct type with 42V IGS installed between the engine and transmission and belt driven type with 42V IGS connected to the engine and belt in the current alternator seat.

1 is a diagram schematically showing a typical vehicle configuration employing a 42V belt driven IGS.

On the other hand, 42V system vehicles that want to improve fuel efficiency through idle stops have the Idle Stop & Go function of hybrid vehicles.

Here, the idle stop / high function means that the engine is automatically stopped under a predetermined condition such as when the vehicle stop state is maintained for a predetermined time or more, and when a restart is requested by the driver's will and the vehicle's own condition. The function is to enable normal operation by automatically restarting the engine via the starter or IGS.

This feature prevents fuel consumption unrelated to driving wheels when the engine is idle, which provides about 15% fuel economy and reduced emissions during urban traffic congestion.

However, the following safety problems may occur in a 42V belt driven IGS vehicle having an idle stop / high function as described above.

In other words, when an accident occurs such as rushing, approaching collision or stopping of vehicle while stopping, the driver has to turn the steering wheel in a hurry to move the vehicle. That is, since steering assistance is impossible when the engine is off, the above-mentioned dangerous situation cannot be avoided even if the driver operates the steering wheel.

This problem can be solved by applying electronic power steering (EPS) which induces steering power to the motor. The price is expensive (the operation performance of the EPS and the HPS are almost similar, so that the consumer does not pay more), and the disadvantage is that it is not applicable to a large car.

Therefore, there is a demand for a method capable of solving the above safety problems in a 42V vehicle with an idle stop / high function equipped with a general hydraulic power steering device.

Therefore, the present invention has been invented to solve the above problems, the driver suddenly steer the steering wheel to avoid the sudden occurrence of situations such as rushing or approaching collision of other vehicles in the vehicle's idle stop state, the vehicle's sliding during the stop, etc. In the case of the rotation operation, the control unit is configured to detect the sudden rotation operation state of the steering wheel through the steering angle sensor to automatically release the idle stop state of the vehicle (engine start), so that in the emergency situation, It is an object of the present invention to provide an idle stop / high control method for an intermittent driving vehicle using a steering angle sensor that enables coping with a sudden situation by steering wheel operation after the stop state is automatically released.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention is directed to an idle stop / high control method for an intermittent driving vehicle,

A first step of driving the vehicle in a normal state of the system after starting; A second step of determining whether the vehicle state corresponds to an idle stop prohibition condition and, if the vehicle state does not correspond to an idle stop prohibition condition, determining whether the vehicle operation state and the vehicle state correspond to an idle stop entry condition; A third step of controlling the vehicle in an idle stop mode when the idle stop entry condition is met; A fourth step of determining whether an abrupt rotation operation state of a steering wheel is made from a signal of a steering angle sensor in an idle stop state; A fifth step of outputting a control signal for releasing an idle stop state of the vehicle when a sudden rotation operation state is detected; otherwise, maintaining an idle stop state; A sixth step of determining whether the vehicle operation state and the vehicle state correspond to an idle stop release condition in the idle stop holding state; And a seventh step of outputting a control signal for releasing the idle stop state in the case of the idle stop release condition.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to an idle stop / high control method of an intermittent driving vehicle using a steering angle sensor, wherein a driver steers to avoid a sudden occurrence such as a rush or approach collision of another vehicle or a vehicle push during a stop in the idle stop state. The main feature of the control is to automatically release the idle stop when the wheel is operated rapidly.

Conventionally, when the hydraulic power steering system (HPS) is applied to a 42V belt type vehicle having an idle stop & go function, the steering wheel when the engine is stopped for a while under the idle stop entry condition while the vehicle is driving. There was a safety problem that could not cope with the sudden situation because the steering of the vehicle is not made even if the sudden situation to turn sharply.

Therefore, in the 42V belt type vehicle to which the hydraulic power steering device is applied, not the electric power steering device, a new idle stop / high function control is required, and the present invention is to solve the above-mentioned problem, and in particular, the idle stop / high function The difference is that the output signal of the steering angle sensor (SAS) is used for control.

As the steering angle sensor, an encoder type steering angle sensor is known to detect a rotation angle of a steering wheel.

2 is a view schematically illustrating a steering angle sensor, which describes a slit disk 41 having a plurality of slits formed concentrically and integrally coupled to the steering shaft 2 in the same direction and angle during steering. Two pairs of photo interrupts consisting of a light emitting diode (LED) and a port transistor (TP) are fixed to one side of the slit disk 41.

In this configuration, when the steering shaft 2 is rotated by the operating force of the steering wheel 1, in the photo interrupt, the slit disk 41 causes a specific specificity determined according to the transmission and blocking of light generated by the light emitting diodes (LEDs). Each steering angle (eg pulse cycle 8 °) generates an 'on / off' pulse.

FIG. 3 is a diagram showing the shape of the pulse signal output from the steering angle sensor. As shown in FIG. 3, two pulse signals of the A phase and the B phase are output, and the steering angle θ can be measured based on the change in the phase difference dT ( dT∝1 / dθ).

In addition, the rotational speed of the steering wheel can be measured from the phase difference dT between two pulse signals A-phase and B-phase output from the steering angle sensor. As shown in FIG. 4, the output of the pulse signal according to the operating state of the steering wheel is illustrated. It is shown by comparison, Table 1 shows a comparison of the steering speed according to the phase difference dT.

As shown in Table 1, it can be seen that the smaller the phase difference, the faster the rotational steering.

In addition, when the steering wheel is normally rotated by the driver, the phase difference dT between the two pulse signals is 25 msec or more, and the phase difference dT value is very small (15 msec or less). It becomes possible to judge.

Hereinafter, an idle stop / high control method for a 42V belt type intermittent driving vehicle according to the present invention will be described with reference to the accompanying FIG. 5.

First, when the driver starts the vehicle, the control unit includes a steering angle sensor and checks whether the vehicle is in a normal state as is normally performed for all systems of the vehicle such as a battery, a battery management system (BMS), an IGS, and an engine.

Next, when the vehicle is driven in the normal state of the system after starting, the control unit determines whether the steering wheel has been repeatedly operated by the driver from the output signal of the steering angle sensor.

At this time, it is determined that the steering wheel is repeatedly operated when the phase difference dT value between the two pulse signals of the phase A and B phases of the steering angle sensor is equal to or less than the first predetermined reference value.

As described above, in determining that the steering wheel is repeatedly operated, the first reference value may be set to 25 msec. The first reference value may be set to 25 msec. The phase difference dT between the two pulse signals measured from the output signal of the steering angle sensor is 25 msec or less. The steering wheel is judged to be repeatedly operated.

Here, if it is determined that the control unit is in a repetitive operation state from the signal of the steering angle sensor, it acts as one of the idle stop entry prohibition conditions and keeps the starting state on.

However, if it is determined that the vehicle is not in the repetitive operation state, it is first determined whether the current vehicle state corresponds to the Idle stop entry prohibition condition, and if it corresponds to the Idle stop entry prohibition condition, the driving state (start-up state) is maintained as usual. Done.

If the idle stop entry prohibition condition does not correspond, it is determined whether the current vehicle operation state and the vehicle state correspond to the idle stop entry condition.

Here, the driving unit maintains the driving state (start-up state) when it does not correspond to the idle stop entry condition, and the control unit controls the vehicle in the idle stop mode (engine off) when the idle stop entry condition is met.

As described above, in the control method of the present invention, unlike the conventional control method of controlling the vehicle in the idle stop mode when the vehicle enters the idle stop entering condition regardless of the steering wheel operation, the steering wheel becomes the idle stop entering condition without being repeatedly operated. In this case, the vehicle is controlled in the idle stop mode, which is to prevent frequent idle stops in the shift stage P or N stages.

That is, an idle stop prohibition condition called steering wheel repeat operation state is added. When the steering wheel is repeatedly operated by the driver with a dT value less than or equal to the first reference value, the idle stop is prohibited by applying this as an idle stop prohibition condition ( Startup on).

On the other hand, in the idle stop state of the vehicle, it is determined whether an abrupt rotation operation state is made from the output signal of the steering angle sensor.

At this time, when the phase difference dT between two pulse signals of phase A and phase B of the steering angle sensor is equal to or less than a second predetermined reference value, it is determined that the steering wheel is operated rapidly.

In determining the sudden operation state, the second reference value may be set to 15 mse, and it is determined that the steering wheel is operated abruptly while the phase difference dT value between the two pulse signals measured from the output signal of the steering angle sensor is 15 msec or less.

If a sudden operation state is detected, a control signal for automatically releasing the idle stop (Go), that is, a control signal for starting the engine through the IGS is automatically output.

Eventually, by the control signal output from the control unit, the MCU drives the IGS as a starter to start the engine, whereby the driver can detect an unexpected situation such as rushing, approaching collision, or pushing the vehicle while stopping. If the steering wheel is steered to avoid, steering of the vehicle is made at the driver's will. At this time, the vehicle can be urgently moved in a direction to avoid a sudden situation, thereby preventing a vehicle accident and minimizing damage.

On the other hand, in the state where the sudden operation state is not detected, the idle stop state is continuously maintained, and in this idle stop state, the control unit determines whether the steering wheel is repeatedly operated by the driver from the output signal of the steering angle sensor.

At this time, the determination condition of the steering wheel repeat operation state is the same as the determination condition of the repeat operation state made in the start-on state.

That is, it is determined that the steering wheel is repeatedly operated when the phase difference dT value between the two pulse signals of the phase A and B phases of the steering angle sensor is less than or equal to a predetermined first reference value (for example, 25 msec).

If it is determined that the vehicle is in a repetitive operation state, a control signal for releasing the idle stop is automatically output and the vehicle is started. If the steering wheel is not operated repeatedly, the idle stop is released as usual in the state of maintaining the idle stop. The vehicle is started according to the condition (Go).

Here, when the control unit receives the vehicle operation signal and the vehicle status signal corresponding to the idle release condition, the control unit outputs a control signal for releasing the idle stop, that is, a control signal for starting the engine through IGS. If the vehicle operation signal and the vehicle status signal corresponding to the idle release condition are not input, the vehicle continues to be in the idle stop state.

According to the experimental value of Table 1, the higher the speed is, the more the phase difference dT becomes 25 msec or less. In the present invention, the idle stop is released when the phase difference dT is 25 msec or less, which is the reference value for the repetitive operation determination, from the signal of the steering angle sensor.

In addition, it is determined that the emergency operation of the steering wheel for collision avoidance is less than or equal to the phase difference of 15 msec which is a sudden operation determination criterion from the signal of the steering angle sensor, and the control unit releases the idle stop.

Here, the repeat operation is a rotational speed with a relatively small margin, the sudden operation (urgent operation) is set on a more urgent time basis, the repeat operation state and the sudden operation state is slightly different from the rotation speed of the steering wheel As such, the above difference is made when setting the dT value that is the judgment standard.

In the idle stop / high control process of the present invention as described above, the determination of the idle stop prohibition condition, idle stop entry condition, idle stop release condition, etc. is basically performed in a 42V belt type vehicle having an idle stop / high function. In the normal determination process, the vehicle is controlled according to the determination result.

Examples of each condition are shown in the following Tables 2 to 4, and the control unit receives the detection signals of the vehicle operation state and the vehicle state from the corresponding detection unit installed in the vehicle, and determines whether the conditions correspond to the conditions of the following Tables 2 to 4 After that, the vehicle is controlled.

First, Table 2 shows an example of an idle stop entry prohibition condition, and the control unit determines that the idle stop entry prohibition condition is satisfied when only one of the conditions of 1 to 3 is satisfied.

In Table 2, there are various learning conditions, but it is limited to a control condition in which the engine is in a turbulent state.

In addition, in the canister purge condition, for example, 1 when the canister concentration is normal and 0.6 when it is insufficient, the canister purge amount control is performed to improve the concentration, thereby prohibiting the idle stop (to increase 0.4).

Next, Table 3 shows an example of an idle stop entry condition, and the control unit determines that the idle stop entry condition is satisfied when all of the conditions of 1 to 11 are satisfied or all of the conditions of 12 to 16 are satisfied.

In addition to the above conditions, for safety reasons, Etax, each unit ECU, etc., is to enter the idle stop when operating normally.

Next, Table 4 shows an example of an idle stop release condition, and the control unit determines that the idle stop release condition corresponds to any one of the conditions 1 to 4 only.

As such, in the idle stop / high control method of the 42V belt driven IGS vehicle according to the present invention, the driver may be used to avoid accidents such as rushing, approaching collision of another vehicle, and pushing of the vehicle while the vehicle is in the idle stop state of the vehicle. When the steering wheel is suddenly rotated, the control unit detects this sudden rotation operation state through the steering angle sensor so that the idle stop state of the vehicle is automatically released (engine starts). By only operating, the idle stop state can be released momentarily so that it can cope more effectively with a sudden situation.

As described above, according to the method for controlling the idle stop / high of the intermittent driving vehicle using the steering angle sensor according to the present invention, an accident such as rushing, approaching collision of another vehicle, or pushing of the vehicle while stopping is performed in the idle stop state of the vehicle. When the driver sharply rotates the steering wheel to avoid the situation when the situation occurs, the control unit is configured to detect the sudden rotation operation state of the steering wheel through the steering angle sensor to automatically release the engine idle state (engine start), In a hurry, the driver's steering wheel can be released immediately by manipulating the driver's steering wheel to more effectively cope with an unexpected situation, and thus improve the safety of the vehicle.

The control method of the present invention can secure the idle stop release control function by the driver's will in case of an emergency in a 42V belt type vehicle in which a hydraulic power steering device is applied, in particular, by adding logic.

In addition, when the steering wheel is repeatedly operated, the idle stop control is added to prevent the idle stop control from becoming more frequent than necessary.

Claims (7)

delete delete It is determined whether the vehicle is driven in the normal state of the system after starting, and whether the vehicle state corresponds to the idle stop prohibition condition. If the vehicle operation state does not correspond to the idle stop prohibition condition, the vehicle operation state and the vehicle state are in the idle stop entry condition. A second step of determining whether it is applicable; a third step of controlling the vehicle in an idle stop mode if the idle stop entry condition; and a determination of whether a steer wheel operation is suddenly made from the signal of the steering angle sensor in the idle stop state. And a fourth step of outputting a control signal for releasing the idle stop state of the vehicle when a sudden rotation operation state is detected, otherwise maintaining the idle stop state, and then operating the vehicle in the idle stop maintenance state. And whether the vehicle state corresponds to the idle stop release condition It is in the sixth step and the idle stop releasing condition if one idle stop / and the control of the intermittent operation method using a vehicle steering angle sensor including a seventh step of outputting a control signal for releasing the idle stop state, After the first step, the driver determines whether the steering wheel has been repeatedly operated by the driver from the signal of the steering angle sensor, and if it is determined that the steering wheel has been repeatedly operated, the vehicle is kept in the ignition on state. Idle stop / high control method for an intermittent driving vehicle using a steering angle sensor, characterized in that it further comprises the step of making the step. The method according to claim 3, Intermittent using the steering angle sensor, characterized in that it is determined that the steering wheel is repeatedly operated when the phase difference dT between two pulse signals A-phase and B-phase output from the steering angle sensor is less than or equal to a preset reference value 2 in the determination of the repetitive operation of the steering wheel. How to control idle stop / high of driving vehicle. It is determined whether the vehicle is driven in the normal state of the system after starting, and whether the vehicle state corresponds to the idle stop prohibition condition. If the vehicle operation state does not correspond to the idle stop prohibition condition, the vehicle operation state and the vehicle state are in the idle stop entry condition. A second step of determining whether it is applicable; a third step of controlling the vehicle in an idle stop mode if the idle stop entry condition; and a determination of whether a steer wheel operation is suddenly made from the signal of the steering angle sensor in the idle stop state. And a fourth step of outputting a control signal for releasing the idle stop state of the vehicle when a sudden rotation operation state is detected, otherwise maintaining the idle stop state, and then operating the vehicle in the idle stop maintenance state. And whether the vehicle state corresponds to the idle stop release condition It is in the sixth step and the idle stop releasing condition if one idle stop / and the control of the intermittent operation method using a vehicle steering angle sensor including a seventh step of outputting a control signal for releasing the idle stop state, After maintaining the idle stop of the fifth step, if it is determined that the steering wheel is repeatedly operated by the driver from the signal of the steering angle sensor, a control signal for releasing the idle stop state of the vehicle is output; otherwise, the idle stop state is outputted. Idle stop / high control method for an intermittent driving vehicle using a steering angle sensor, characterized in that it further comprises the step of maintaining. The method according to claim 5, Intermittent using the steering angle sensor, characterized in that it is determined that the steering wheel is repeatedly operated when the phase difference dT between the two pulse signals A-phase and B-phase output from the steering angle sensor in the repetitive operation determination of the steering wheel is less than or equal to a predetermined reference value 3. How to control idle stop / high of driving vehicle. The method according to claim 4 or 6, An idle stop / high control method for an intermittent driving vehicle using a steering angle sensor, characterized in that the reference value 1 is set to 15 msec, and both the reference value 2 and the reference value 3 are set to 25 msec.

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