KR101234642B1 - Limp home controlling systen of hybrid vehicle - Google Patents

Abstract

The present invention discloses an apparatus and method for controlling a lymphatic groove of a hybrid vehicle in which an emergency operation is provided by temporarily forming a hydraulic pressure using a motor when a failure of an electric oil pump and a peripheral system occurs in the hybrid vehicle.
The present invention monitors the electric oil pump and its surrounding system and the operating state to determine whether the lymph groove control condition is satisfied; If the lymphatic home control condition is satisfied, entering the lymphatic home control mode and detecting a state of charge of the battery; Operating a mechanical oil pump by driving a motor in EV mode or HEV mode according to the state of charge of the battery; Combining the gear stages of three speeds or less with the pressure generated by the mechanical oil pump driven by the motor, the process includes maintaining restarting and running after stopping.

Description

LIMP HOME CONTROLLING SYSTEN OF HYBRID VEHICLE}

The present invention relates to a hybrid vehicle, and more particularly, a hybrid vehicle in which an emergency operation is provided by temporarily forming a hydraulic pressure using a motor when a failure of an electric oil pump (EOP) and a peripheral system occurs. To a lymphatic groove control device.

The demand for eco-friendly cars is increasing due to the continuous improvement of fuel efficiency for vehicles and the tightening of emission regulations in each country, and hybrid cars are provided as a realistic alternative.

The hybrid vehicle may have a narrow meaning and may be distinguished from a fuel cell vehicle and an electric vehicle. In the present specification, the hybrid vehicle encompasses a pure electric vehicle and a fuel cell vehicle, and includes one or more batteries, and energy stored in the battery Refers to a vehicle used as a driving force of the vehicle.

Hybrid cars have engines and motors as their power sources, and the engines and motors can be used depending on driving conditions to provide fuel efficiency and reduced emissions.

Hybrid vehicles can improve fuel efficiency by how the engine and the motor are operated in harmony in the course of running on two power sources consisting of an engine and a motor.

Hybrid cars are equipped with the HSG (Hybrid Stop and Go) function, which automatically turns on or off the engine depending on the driving situation. The HSG function causes the engine to stop while driving.

Then, the electric vehicle mode (EV mode) that runs on the power of the motor alone is executed, and the operation of the engine is stopped in this state.

As such, when the operation of the engine is stopped, the operation of the mechanical oil pump for supplying oil to the automatic transmission by the power of the engine is also stopped, so that the proper hydraulic pressure is not supplied to the automatic transmission and the wet engine clutch.

Therefore, normal line pressure is not generated in the automatic transmission, and the engagement of the friction elements (clutch and brake) that maintains the forward 1 speed in the planetary gear is released.

Hybrid cars are equipped with an additional electric oil pump in parallel with the mechanical oil pump in preparation for this phenomenon, and the electric oil pump can be operated separately from the engine.

The electric oil pump is operated when the engine is stopped or the EV mode is executed by the execution of the HSG function.In the state where the HSG function is executed, the line pressure of the transmission is not necessary so that it is controlled by the set low duty to maintain the line pressure. In addition, it is possible to provide the start response of the vehicle by shortening the time taken for the engine start to rise to the normal line pressure upon restart.

After that, when the mechanical oil pump mounted on the transmission reaches an idle speed that can generate sufficient pressure, the driving of the electric oil pump is stopped.

In case of such a failure of the electric oil pump, an oil pump controller for driving the electric oil pump, a short circuit or disconnection of the power and signal cables connected to the electric oil pump, and open fixing of the relay for operating the electric oil pump, the electric motor The operation of the oil pump will not work properly.

When the system constituting the electric oil pump is stopped due to the operation of the stagnant stagnation section or the traffic lights, the engine is turned off by the execution of the HSG function and the operation of the mechanical oil pump is stopped.

However, due to a failure of the system constituting the electric oil pump, it is impossible to generate line pressure in the transmission.

Therefore, when the restart is performed after the stop, the line pressure is not formed by the electric oil pump, and thus the start cannot be made or a serious start delay occurs.

In particular, if the start occurs after stopping during the climbing run, since the line pressure is not formed due to a failure of the electric oil pump, the climbing run is not performed and a serious risk of being pushed back occurs.

The present invention has been proposed to solve the above problems, and an object of the present invention is to form a line pressure temporarily using a motor when a failure of an electric oil pump and a peripheral system is detected, thereby reducing the operation of a lymph groove below 3 speeds. To be provided.

An object of the present invention is to calculate the slip amount of the friction element in the transmission to limit the torque input to the transmission when excessive slip is determined so that no burnout of the friction element occurs, so that the protection of the transmission can be provided. .

According to a feature of the present invention, in order to achieve the above object, in a hybrid vehicle to which an engine and a motor are applied, the hybrid vehicle is directly connected to an output shaft of the motor and driven by the motor in an EV mode and an engine start-off state, and the engine in a HEV mode. A mechanical oil pump driven by engine power transmitted through the clutch to generate hydraulic pressure in the transmission; An electric oil pump operated in the EV mode and the engine start-off state to generate hydraulic pressure in the transmission; When the failure of the electric oil pump is detected, the lymph groove control apparatus for a hybrid vehicle is provided, which includes a hybrid controller for entering hydraulic lymph pump control and operating a mechanical oil pump by driving a motor to generate hydraulic pressure.

The hybrid controller may provide emergency operation by maintaining a gear shift speed of 3 speeds or less in the lymph groove control.

The hybrid controller can provide sufficient line pressure for restart after stop by the operation of a mechanical oil pump using a motor in lymph groove control.

The hybrid controller may limit the slip of the friction element by limiting the torque input to the transmission when the slip exceeds the set reference slip amount by calculating the slip amount of the friction element in the transmission when it is restarted after stopping in the lymph groove control.

The hybrid controller may limit the output torque and the vehicle speed when the speed of the motor for driving the mechanical oil pump exceeds the set rotation speed in the lymph groove control.

The hybrid controller includes a failure of the electric oil pump, a short circuit or disconnection of a power cable connecting the electric oil pump, a failure of the oil pump controller, a short circuit or a disconnection of a cable that transmits a control signal of the oil pump controller, and an oil pump controller. Lymph groove control when any one or more of the open fastening faults of the relay that controls the control signal (PWM signal) is detected, and the displacement of the accelerator pedal meets the oscillation condition with the drive shift stage (D or R range) selected. You can enter

In addition, according to another feature of the invention, the process of determining whether to satisfy the lymph groove control conditions by monitoring the electric oil pump and its peripheral system and the operating state; If the lymphatic home control condition is satisfied, entering the lymphatic home control mode and detecting a state of charge of the battery; Operating a mechanical oil pump by driving a motor in EV mode or HEV mode according to the state of charge of the battery; Lymph groove control method of a hybrid vehicle including a process of maintaining a restart and running after stopping by combining a gear stage of three speeds or less by the pressure generated by the mechanical oil pump driven by the motor.

The rim groove control condition may include a failure of the electric oil pump, a short circuit or disconnection of a power cable connecting the electric oil pump, a failure of the oil pump controller, a short circuit or a disconnection of the cable that transmits a control signal of the oil pump controller, and an oil pump controller. Any one or more of the open fastening faults of the relay for controlling the control signal may be detected and set to a condition that satisfies the oscillation condition at the traveling shift stage.

In the lymphatic home control mode, when the state of charge of the battery exceeds the set reference state of charge, the motor operates in the EV mode to operate the mechanical oil pump, and in the case of the reference state of charge, the motor operates in the HEV mode to operate the mechanical oil pump. Can be.

In the lymph groove control mode, if the slip amount of the friction element in the transmission exceeds the set reference slip amount, the torque input to the transmission may be limited to limit the slip of the friction element.

When the speed of the motor for driving the mechanical oil pump in the lymph groove control mode exceeds the set rotation speed, the output torque and the vehicle speed may be limited.

As described above, according to the exemplary embodiment of the present invention, when a failure of the electric oil pump occurs in a hybrid vehicle, it is possible to provide a stable restart and emergency operation to a repair shop through lymph groove control, thereby improving driving stability and improving the merchandise of the vehicle. Can improve.

In addition, when restarting after stopping in the state of failure of the electric oil pump, the amount of slip of the friction element in the transmission is calculated, and if excessive slip, the torque input to the transmission is limited to prevent excessive slip of the friction element. Can be protected stably.

In addition, when a failure of the electric oil pump occurs, the shift stage is maintained at three speeds or less by the control of the lymph groove, and the warning lamp is turned on so that quick repair and maintenance can be performed.

1 is a view schematically showing a lymphatic groove control apparatus of a hybrid vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a lymphatic groove control procedure of a hybrid vehicle according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the embodiments.

The present invention can be embodied in various different forms, and thus the present invention is not limited to the embodiments described herein.

1 is a view schematically showing a lymphatic groove control apparatus of a hybrid vehicle according to an embodiment of the present invention.

Referring to FIG. 1, an embodiment of the present invention includes an engine 100, an HSG 110, an engine clutch 130, a motor 200, a transmission 300, a mechanical oil pump 310, and an electric oil pump 400. ), A hybrid controller 410, an oil pump controller 420, an auxiliary battery 430, an inverter 440, and a main battery 450.

The engine 100 is operated as the first driving source in the hybrid vehicle, and the start is controlled on / off according to the driving mode and the driving situation.

The engine 100 is turned off in the EV mode, is turned on in the HEV mode, and controlled to be turned on and off as the HSG function is executed.

The HSG 110 executes starting on and off of the engine 100 according to the execution of the HSG function, and when the excess output is generated while the engine 100 maintains the starting on, the HSG 110 operates as a generator to regenerate the excess output. The voltage is recovered by energy to generate a voltage, and the generated voltage is charged in the main battery 450 through the inverter 440.

The engine clutch 130 is mounted between the engine 100 and the motor 200 to interrupt power transmission between the engine 100 and the motor 200, and is typically applied as a wet clutch to provide a mechanical oil pump 310 or It is operated by the hydraulic pressure supplied from the electric oil pump (400).

The motor 200 is operated as a second driving source in the hybrid vehicle, is driven by the three-phase AC current supplied from the inverter 440 to transfer the output torque to the transmission 300, and operates as a generator during deceleration to deliver regenerative energy. The voltage is recovered to generate voltage, and the generated voltage is charged to the main battery 450 through the inverter 400.

The transmission 300 may be applied to an automatic transmission or a continuously variable transmission, and the transmission ratio is adjusted according to the driving demand torque and the driving situation, and the output torque added through the engine clutch 130 according to the driving mode is applied to the adjusted transmission ratio. Outputs it to the driving wheels so that they can run.

The mechanical oil pump 310 is mounted on the transmission 300, and is directly connected to the output shaft of the motor 200, and when the failure of the electric oil pump 400 or the peripheral system is detected, the engine 100 is turned off. The hydraulic pressure is formed in the transmission 300 by driving the motor 200, and is operated by the power of the engine 100 transmitted through the engine clutch 130 in the HEV mode to form the hydraulic pressure in the transmission 300.

The electric oil pump 400 is operated in the state in which the start of the engine 100 is turned off or the vehicle is driven in the EV mode by the execution of the HSG function to form hydraulic pressure in the transmission 300 and the engine clutch 130.

Hybrid controller 410 is a top-level controller to control the overall operation according to the operation of the hybrid vehicle, when a failure of the electric oil pump 400 is detected, enters the lymph groove control and then the mechanical oil pump driven by the motor 200 Operating 310 creates a minimum pressure (approximately 10 BAR).

Therefore, it provides stable starting from restarting after stopping, and provides emergency operation to the repair shop by maintaining a gear shift speed of 3 speeds or less.

In addition, the hybrid controller 410 calculates the slip amount of the friction element in the transmission 300 when it is restarted after stopping in the state where the failure of the electric oil pump 400 is generated is input to the transmission 300 if excessive slip By limiting the torque to avoid excessive slip of the friction element, the friction element is prevented from being burned out.

In addition, the hybrid controller 410 detects the speed of the motor 200 driving the mechanical oil pump 310 and limits the torque when the set speed exceeds the set rotation speed.

The hybrid controller 410 is a failure of the electric oil pump 400, a short circuit or disconnection of the power cable connecting the electric oil pump 400, the failure of the oil pump controller 420, the control of the oil pump controller 420 A short circuit or disconnection of a cable that transmits a signal, or one or more of the open fastening failure of the relay that controls the control signal (PWM signal) of the oil pump controller 420 is detected, and the shift shift stage D Or R range) is selected, and if the displacement of the accelerator pedal meets the oscillation condition (more than 5%), it enters the lymph groove control.

The oil pump controller 420 operates the electric oil pump 400 under the control of the hybrid controller 410 to form a line pressure in the transmission 300.

The auxiliary battery 430 is responsible for electric load in the hybrid vehicle, and supplies power required for the operation of each controller.

The inverter 440 adjusts the driving torque and the driving speed of the motor 200 by converting the DC voltage supplied from the main battery 450 into a three-phase AC voltage according to a control signal applied from the hybrid controller 410.

The inverter 440 charges the main battery 450 by supplying a voltage recovered as regenerative energy when the motor 200 is operated as a generator.

The main battery 450 supplies power to the motor 200 in order to assist the output of the engine 100 in the HEV mode, and charges the generated voltage of the motor 200.

In the hybrid vehicle according to the present invention including the functions as described above, a typical operation is performed in the same or similar manner as a general hybrid vehicle, and thus a detailed description thereof will be omitted.

Since the present invention executes the lymph groove control when a failure of the electric oil pump or the peripheral system applied to the hybrid vehicle occurs, only the operation thereof will be described in detail.

2 is a flowchart illustrating a lymphatic groove control procedure of a hybrid vehicle according to an exemplary embodiment of the present invention.

In the hybrid vehicle to which the present invention is applied, the hybrid controller 410 monitors the state of the electric oil pump (EOP: 400) and the oil pump controller (OPU: 420) (S101), and detects the displacement of the accelerator pedal and the inhibitor switch. The operation state including the position and the like is monitored by the shift lever (S102), and it is determined whether the condition for entering the limp home control due to the failure of the electric oil pump 400 or its peripheral system is satisfied (S103).

The conditions for entering the lymph groove control include a failure of the electric oil pump 400, a short circuit or disconnection of a power cable connecting the electric oil pump 400, a failure of the oil pump controller 420, and the control of the oil pump controller 420. A short circuit or disconnection of a cable that transmits a signal, or one or more of the open fastening failure of the relay that controls the control signal (PWM signal) of the oil pump controller 420 is detected, and the shift shift stage D Or R range), the displacement of the accelerator pedal is set to a condition that satisfies the oscillation condition (5% or more).

In the determination of S103, if the hybrid controller 410 satisfies the lymph groove control entry condition due to the failure of the electric oil pump 400 or the peripheral system thereof, the hybrid controller 410 enters the lymph groove mode (S104).

In addition, since restarting is required in the stopped state, the state of charge (SOC) of the main battery 450 is detected to determine whether the reference charging state (for example, SOC> 40%) is exceeded. (S106).

In operation S106, the hybrid controller 410 drives the motor 200 in the EV mode through the phase change of the inverter 440 when the state of charge of the main battery 450 exceeds the set reference state of charge. By operating a mechanical oil pump (MOP: 310) mounted on the transmission 300 to form a minimum pressure that can be formed in the line pressure (S107) (S109).

In addition, in the determination of S106, if the state of charge of the main battery 450 is less than the reference state of charge, the hybrid controller 410 drives the motor 200 in the HEV mode through the phase change of the inverter 440 to the transmission 300. By operating the mechanical oil pump 310 mounted on the transmission 300 to form a minimum pressure that can be formed in the line pressure (S108) (S109).

When the mechanical oil pump 310 is operated by the driving of the motor 200 as described above, and the minimum pressure at which the line pressure can be formed in the transmission 300 is formed, the hybrid controller 410 performs three speeds of the transmission 300. By providing the driving in the lymph groove mode by combining to the following shift stage, to provide a stable sense of oscillation at restart, and to provide a stable running to the repair shop for repair replacement (S110).

As described above, the hybrid controller 410 calculates a slip amount of a friction element of the transmission 300, for example, an under brake, in the process of running the lymph groove mode as described above (S111), and the slip amount exceeds the set reference slip amount. It is determined whether (S112).

If the slip amount of the friction element does not exceed the set reference slip amount in the determination of S112, the speed of the motor 200 is detected (S113) and it is determined whether the set speed limit is exceeded (S114).

If the speed of the motor 200 does not exceed the speed limit in the determination of S114, the process returns to step S105 to repeat the above-described operation, and if the speed of the motor 200 exceeds the speed limit, the output torque and the vehicle speed are limited. By protecting the motor 200 (S115).

Thereafter, the warning lamp for notifying the failure of the electric oil pump 400 is turned on to induce a quick repair replacement (S116).

When the slip amount of the friction element exceeds the set reference slip amount in the determination of S112, the torque input to the transmission 300 is controlled to '0' so that the slip of the friction element does not occur, thereby causing burnout of the transmission 300. To prevent (S117).

Then, by limiting the output torque and the vehicle speed to protect the motor 200 (S115) by turning on a warning lamp for notifying the failure of the electric oil pump 400 to induce a quick repair replacement (S116).

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, , Additions, deletions, and so on, other embodiments may be easily suggested, but this is also included in the spirit of the present invention.

100: engine 200: motor
300: transmission 310: mechanical oil pump
400: electric oil pump 410: hybrid controller
420: oil pump controller 440: inverter

Claims (11)

In a hybrid vehicle to which an engine and a motor are applied,
A mechanical oil pump which is directly connected to an output shaft of the motor and driven by engine power transmitted through the engine clutch in the HEV mode to generate hydraulic pressure in the transmission;
An electric oil pump operated in the EV mode and the engine start-off state to generate hydraulic pressure in the transmission;
A hybrid controller configured to enter a lymph groove control when a failure of the electric oil pump is detected, and then generate a hydraulic pressure by operating a mechanical oil pump by driving a motor;
It includes;
The hybrid controller includes a failure of the electric oil pump, a short circuit or disconnection of a power cable connecting the electric oil pump, a failure of the oil pump controller, a short circuit or a disconnection of a cable that transmits a control signal of the oil pump controller, and an oil pump controller. Lymph groove control when any one or more of the open fastening faults of the relay that controls the control signal (PWM signal) is detected, and the displacement of the accelerator pedal meets the oscillation condition with the drive shift stage (D or R range) selected. Into,
Hybrid vehicle characterized in that the slip limit of the friction element by limiting the torque input to the transmission if the slip exceeds the set reference slip amount by calculating the slip amount of the friction element in the transmission in case of restarting after stopping in the lymph groove control Lymphatic groove control. delete The method of claim 1,
The hybrid controller is a lymphatic groove control device for a hybrid vehicle, characterized in that the operation of the mechanical oil pump using a motor in the lymph groove control provides sufficient line pressure for restarting after stopping. delete The method of claim 1,
And said hybrid controller limits the output torque and the vehicle speed when the speed of the motor for driving the mechanical oil pump in the lymph groove control exceeds a set number of revolutions. delete delete delete delete delete delete

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