KR20120059260A - Control system and method for hybrid vehicle - Google Patents

Abstract

PURPOSE: A control system and a method for hybrid vehicle are provided to stably manage a SOC(State Of Charge) of a battery by dividing torque. CONSTITUTION: A control system for hybrid vehicle comprises an angle of inclination detection unit(101), a battery supervisory controller, and a hybrid control unit. The angle of inclination detection unit provides inclination information of driving road to the hybrid control unit. The battery supervisory controller provides SOC information of a battery(106) to the hybrid control unit. If the information of the angle of inclination detection unit determines the road is inclined, the hybrid control unit detects the angle of inclination of the road and the SOC of battery. The hybrid control unit limits torque of the motor according to the SOC of the battery and angle of inclination.

Description

CONTROL SYSTEM AND METHOD FOR HYBRID VEHICLE}

The present invention relates to a hybrid vehicle, and more particularly, to control the SOC of the battery in the stable driving on a hill road, and to control the hybrid vehicle to provide an optimum response torque in the shifting operation by setting a preliminary range for shifting And to a method.

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.

The hybrid vehicle may provide the optimum output torque depending on how the engine and the motor are operated in harmony while driving with two power sources consisting of the engine and the motor.

The typical power train structure of a hybrid vehicle is a TMED (Transmission Mounted) type with one clutch. Unlike a FMED (Frywheel Mounted) type or a TMED type with two clutches, the drive side (engine / motor) and the dodge There is no clutch between the ipsilateral side (transmission).

The existing clutch between the driving side and the driven side generates a speed difference between the driving side and the driven side through heat through the clutch disk to absorb shocks applied to the transmission.

Therefore, in the TMED type hybrid vehicle having one clutch, the following two methods are applied to replace the role of the clutch existing between the driving side and the driven side.

One method is to control the wheel speed through the speed control of the motor, and the target speed of the motor is mounted on the output of the transmission and uses information of the vehicle speed sensor that detects the vehicle speed.

However, since the torque is used in the process of following the speed of the motor, if the SOC (State Of Charge) of the battery is insufficient, the amount of torque that follows the speed of the motor is limited and the time until the target speed is reached. ), A delay occurs, which causes a problem in that the output responsiveness is degraded.

As a result, a problem arises in that the shift is completed when the target speed is not reached.

Fixed torque time constant designed in consideration of system excitation has a problem that it cannot actively cope with the need for fast response speed according to shifting situation.

The other method is to absorb the speed difference through the synchronizer inside the transmission and generate heat as the clutch disk.

However, there is a limit to the shock absorption capacity due to the speed difference in the package structure inside the transmission, and when the shocks of the synchronizers overlap, it causes a problem of shortening the life of the transmission due to the reduced life of the synchronizer.

In addition, when the synchronizer is added or increased in order to increase the shock absorbing capacity, the entire transmission should be large in size, and the overall system length becomes long.

This problem causes additional problems in the shift situation of the hill road.

For example, when driving a hill road, the load of the motor is increased due to the inclination of the road surface, which causes a lot of battery consumption.

Therefore, when shifting is required while driving, there is a problem that the available torque amount of the motor may be limited by the lack of SOC of the battery.

In addition, the amount of inertia of the motor itself is also increased to reduce the acceleration amount of the motor generated at the same torque.

The present invention has been proposed to solve the above problems, an object of the present invention is to distribute the torque of the engine and the motor in accordance with the inclination angle and the SOC of the battery in the driving of the hill road to stably manage the SOC of the battery, thereby It is to provide a stable response to the estimation of the target speed through the driving of.

In addition, another object of the present invention is to set the preliminary range in preparation for the shift on the hill road, and when the vehicle speed reaches the preliminary range set, the engine torque is increased to control the preliminary step of the shift execution to add an offset to the available torque. It is applied to shorten the time to reach the target speed to provide fast response.

According to the present invention to achieve the above object, a hybrid vehicle having a first drive source and a second drive source, the inclination angle detection unit for providing the inclination angle information of the driving road to the hybrid controller; A battery management controller for providing SOC information of the battery to the hybrid controller; Hybrid information including a hybrid controller for detecting the inclination angle of the road and the SOC of the battery when the information on the inclination angle detection unit is determined to be driving on the hill, and limiting the torque of the motor according to the inclination angle and the SOC of the battery to redistribute and control the torque of the engine and the motor. A control device of is provided.

The hybrid controller may apply torque redistribution to increase the output torque of the engine through the engine controller, and reduce the output torque of the motor through the power controller to manage the SOC of the battery above a predetermined value.

According to another aspect of the present invention, a hybrid vehicle having an engine and a motor, comprising: an inclination angle detector for providing inclination angle information of a driving road to a hybrid controller; A battery management controller for providing SOC information of the battery to the hybrid controller; If it is determined that the hill climbing is judged, the high speed is set to the shift reserve range in preparation for the shift speed of the flat driving condition.If the vehicle speed enters the shift reserve range, the engine torque is increased to the preliminary stage of shift execution to complete the shift. Provided is a control device for a hybrid vehicle, comprising a hybrid controller for inducing.

The hybrid controller may reduce and adjust the torque response time constant set value in the process of inducing the shift completion by controlling the increase of the engine torque to provide responsiveness of the shift completion.

According to another aspect of the present invention, a hybrid vehicle having an engine and a motor, comprising: an inclination angle detector for providing inclination angle information of a driving road to a hybrid controller; A battery management controller for providing SOC information of the battery to the hybrid controller; When it is determined that driving on the hill is determined, the torque limit value of the motor is adjusted according to the inclination angle of the road and the SOC of the battery. This provides a control device for a hybrid vehicle that includes a hybrid controller that raises engine torque to a preliminary stage of the shift run to induce a fast shift complete.

The hybrid controller may apply torque limit adjustment of the motor to raise the torque of the engine and execute torque redistribution to reduce the torque of the motor.

In addition, according to another feature of the invention, the process of determining whether the slope road entry by detecting the inclination angle of the driving road; Detecting the SOC of the battery and adjusting the torque limit value of the motor according to the inclination angle and the SOC when the hill is entered; And controlling the SOC of the battery by redistributing torque between the engine and the motor according to the adjusted torque limit value of the motor.

According to the torque redistribution of the engine and the motor, the torque of the engine may be increased and the torque of the motor may be reduced.

In addition, according to another feature of the invention, the process of determining whether the slope road entry by detecting the inclination angle of the driving road; Setting a higher speed as a shift reserve range in preparation for a flat shift speed when entering a hill road; When the vehicle speed enters the shift preliminary range, the hybrid vehicle includes raising the engine torque before shifting, applying the offset value to the available torque of the shift speed control, and adjusting the torque response time constant setting to induce rapid shift completion. A control method of is provided.

In addition, according to another feature of the invention, the process of determining whether the slope road entry by detecting the inclination angle of the driving road; Detecting the SOC of the battery and adjusting the torque limit value of the motor according to the inclination angle and the SOC when the hill is entered; Managing SOC of the battery by redistributing torque between the engine and the motor according to the adjusted torque limit value of the motor; Setting a high speed to a shift reserve range in preparation for the flat shift speed; When the vehicle speed enters the shift preliminary range, the hybrid vehicle includes raising the engine torque before shifting, applying the offset value to the available torque of the shift speed control, and adjusting the torque response time constant setting to induce rapid shift completion. A control method of is provided.

As described above, according to the exemplary embodiment of the present invention, the SOC management of the battery according to the inclination angle in the hill road driving of the hybrid vehicle may provide a fast response speed within the available torque amount when shifting.

In addition, the durability of the transmission may be improved by increasing the synchronizer life of the transmission, and the package size of the transmission may be reduced by reducing the capacity of the synchronizer to provide optimization of the layout of the vehicle.

In addition, by providing a stable speed synchronization between the drive shaft and the driven shaft to improve the ride comfort and optimize the reaction time to reach the target speed according to the shifting to improve the marketability.

1 is a view showing a control device of a hybrid vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a 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 showing a control device of a hybrid vehicle according to an embodiment of the present invention.

As can be seen in Figure 1, the control device of the hybrid vehicle according to an embodiment of the present invention, the tilt angle detection unit 101, ECU (Engine Control Unit: 102), HCU (Hybrid Control Unit: 103), CCU (Clutch) Control Unit: 104), PCU (Power Control Unit: 105), Battery 106, BMS (Battery Management System: 107), Engine 200, Engine Clutch 250, Motor 300, Transmission 400 Include.

The inclination angle detection unit 101 detects the road inclination angle of the driving area and provides information about the inclination angle to the HCU 103.

The ECU 102 controls the general operation of the engine 200 in cooperation with the HCU 103 connected to the network, and provides operation state information of the engine 200 to the HCU 103.

The HCU 103 is a top-level controller, which collectively controls the lower controllers connected to the network and collects and analyzes information of the lower controllers to control the overall behavior of the hybrid vehicle.

The HCU 103 detects the inclination angle when the information provided from the inclination angle detector 101 is determined to be climbing on a hill, and detects the SOC of the battery 106 provided by the BMS 107.

The HCU 103 redistributes the torque of the engine 200 and the motor 300 to change the torque limit value of the motor 300 according to the inclination angle of the hilltop driving and the SOC of the battery 106. .

Accordingly, by applying the torques of the redistributed engine 200 and the motor 300, the output torque of the engine 200 is increased through the ECU 102, and the output torque of the motor 300 is increased through the PCU 105. By reducing, the SOC of the battery 106 is stably managed.

In addition, when the information provided from the inclination angle detector 101 is determined to be climbing on a hill road, the HCU 103 may change a higher speed (lower speed shift situation) in preparation for a shift speed of a flat driving condition. Set to).

Then, when the vehicle speed enters the preset speed change range, the torque of the engine 200 is increased through the ECU 102 as a preliminary step of shift execution, and the offset is added to the available torque during speed control, and at the same time, the torque response time constant By reducing and adjusting the set value of, the response time of the speed change can be provided, thereby shortening the arrival time of the target speed.

The CCU 104 controls the actuators provided in the transmission 400 under the control of the HCU 103 connected to the network to control the engagement of the target shift stage, and controls the pressure of the fluid supplied to the engine clutch 250. By engaging and disengaging the engine clutch 250, the power transmission of the engine 200 is interrupted.

The PCU 105 includes an inverter and a protection circuit composed of a motor control unit (MCU) and a plurality of power switching elements, and the DCU 105 supplies a DC voltage supplied from the battery 106 according to a control signal applied from the HCU 103. The motor 300 is controlled by converting into a three-phase AC voltage.

The power switching element included in the PCU 105 may be configured of any one of an Insulated Gate Bipolar Transistor (IGBT), a MOSFET, a transistor, and a relay.

In addition, the protection circuit included in the PCU 105 monitors the flow of the driving power, and distributes or blocks the driving power when overvoltage and overcurrent flow into the driving power due to various causes such as a collision, a collision, a lightning strike, and the like of the vehicle. It protects all systems provided in the hybrid vehicle and stably protects the occupants from high pressure.

The battery 106 supplies power to the motor 300 to assist the output of the engine 200 in the HEV mode, and charges the voltage generated by the motor 300.

In addition, power is supplied to the motor 300 in the EV mode, and the regenerative braking control charges the voltage generated by the motor 300 operated as a generator.

The BMS 107 comprehensively detects information such as voltage, current, and temperature of the battery 106 to manage the SOC from being over-discharged below the threshold voltage or overcharged above the threshold voltage, and managing the SOC information of the battery 106. Provided at 103.

The engine 200 is driven and controlled to an optimal driving point according to the control of the ECU 102.

The ISG 210 executes idle stops and restarts of the engine 200 according to driving conditions of the vehicle.

The engine clutch 250 is disposed between the engine 200 and the motor 300, and is operated under the control of the CCU 104 to control power transmission between the engine 200 and the motor 300.

The motor 300 is driven by a three-phase AC voltage supplied through the PCU 105 under the control of the HCU 103 to support the output torque of the engine 200, and has excess torque at the output of the engine 200. It is operated by generator in case or braking.

The transmission 400 adjusts the transmission ratio according to the control of the CCU 104, and distributes the output torques applied through the clutch 250 according to the driving mode to the transmission wheels so that the vehicle can be driven. do.

The transmission 400 may be applied to an automatic transmission or a continuously variable transmission.

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

Since the present invention manages the SOC of the battery by adjusting the torque limit value of the motor according to the inclination angle and the SOC of the battery when entering a hill driving, and controls the stable shift by setting the shift spare range, only the operation thereof is specifically described. Explain.

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

In the state in which the hybrid vehicle to which the present invention is applied is operated (S101), the HCU 103 detects the inclination angle of the road in the driving region from the inclination angle detection unit 101 (S102) and determines whether the hill road is entered (S103).

When the HCU 103 determines to enter the hill road in S103, the HCU 103 detects the inclination angle provided by the inclination angle detector 101, and detects the SOC of the battery 106 provided in the BMS 107 (S104).

In addition, the HCU 103 adjusts the torque limit value of the motor 300 according to the inclination angle according to the hill climbing and the SOC of the battery 106 (S105), and applies the adjusted torque limit value of the motor 300. The torque between the engine 200 and the motor 300 is redistributed (S106).

Thereafter, the HCU 103 increases the output torque of the engine 200 through the ECU 102 by applying the torques of the redistributed engine 200 and the motor 300, and the motor 300 through the PCU 105. The SOC of the battery 106 is stably managed by reducing the output torque of (S107).

In addition, since the information provided from the inclination angle detection unit 101 is determined to be climbing on a hill road, the HCU 103 changes a higher speed (lower speed shift situation) in preparation for a shift speed of a flat driving condition. range) (S108).

Thereafter, the HCU 103 detects the current traveling vehicle speed and determines whether the traveling vehicle speed reaches the set shift reserve range (S109).

In step S109, the HCU 103 repeats the vehicle speed detection when the traveling vehicle speed does not reach the set shift reserve range, and reaches the set shift reserve range when the engine speed is changed through the ECU 102 as a preliminary step of shift execution. The torque is increased to add an offset to the available torque during speed control (S110), and the set value of the torque response time constant is reduced and adjusted (S111).

Therefore, when the shift execution occurs on the hill road, stable shift completion is provided to provide stable response to output torques of the engine 200 and the motor 300, thereby shortening the arrival time of the target speed.

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.

101: tilt angle detection unit 102: ECU
103: HCU 105: PCU
106: battery 107: BMS
250: clutch 300: motor

Claims (10)

In a hybrid vehicle having a first drive source and a second drive source,
An inclination angle detector for providing inclination angle information of the driving road to the hybrid controller;
A battery management controller for providing SOC information of the battery to the hybrid controller;
A hybrid controller detecting the inclination angle of the road and the SOC of the battery when the information of the inclination angle detection unit is determined to be driving on the hill, and limiting the torque of the motor according to the inclination angle and the SOC of the battery to redistribute and control the torque of the engine and the motor;
Hybrid vehicle control device comprising a. The method of claim 1,
The hybrid controller applies a torque redistribution to increase the output torque of the engine through the engine controller, and reduces the output torque of the motor through the power controller to manage the SOC of the battery above a predetermined value. . In a hybrid vehicle having an engine and a motor,
An inclination angle detector for providing inclination angle information of the driving road to the hybrid controller;
A battery management controller for providing SOC information of the battery to the hybrid controller;
If it is determined that the hill climbing is judged, the high speed is set to the shift spare range in preparation for the shift speed of the flat driving condition.If the vehicle speed enters the shift reserve range, the engine torque is increased to the preliminary stage of shift execution to complete the shift. Inducing hybrid controller;
Hybrid vehicle control apparatus comprising a. The method of claim 3,
And said hybrid controller reduces and adjusts the torque response time constant set value in the process of inducing shift completion by controlling the increase of engine torque, thereby providing response of completion of shift. In a hybrid vehicle having an engine and a motor,
An inclination angle detector for providing inclination angle information of the driving road to the hybrid controller;
A battery management controller for providing SOC information of the battery to the hybrid controller;
When it is determined that driving on the hill is determined, the torque limit value of the motor is adjusted according to the inclination angle of the road and the SOC of the battery. A hybrid controller which raises the engine torque to a preliminary stage of the shift execution to induce a fast shift completion;
Hybrid vehicle control device comprising a. The method of claim 5,
And the hybrid controller applies torque limit value adjustment of the motor to increase torque of the engine and execute torque redistribution to reduce torque of the motor. Determining whether the vehicle is on a hill road by detecting an inclination angle of the driving road;
Detecting the SOC of the battery and adjusting the torque limit value of the motor according to the inclination angle and the SOC when the hill is entered;
Managing SOC of the battery by redistributing torque between the engine and the motor according to the adjusted torque limit value of the motor;
Hybrid vehicle control method comprising a. The method of claim 7, wherein
And controlling the torque of the engine in accordance with the torque redistribution of the engine and the motor and reducing the torque of the motor. Determining whether the vehicle is on a hill road by detecting an inclination angle of the driving road;
Setting a higher speed as a shift reserve range in preparation for a flat shift speed when entering a hill road;
When the vehicle speed enters the shift preliminary range, increasing the engine torque before shifting, applying the offset to the available torque of the shift speed control, and adjusting the torque response time constant setting value to induce rapid shift completion;
Hybrid vehicle control method comprising a. Determining whether the vehicle is on a hill road by detecting an inclination angle of the driving road;
Detecting the SOC of the battery and adjusting the torque limit value of the motor according to the inclination angle and the SOC when the hill is entered;
Managing SOC of the battery by redistributing torque between the engine and the motor according to the adjusted torque limit value of the motor;
Setting a high speed to a shift reserve range in preparation for the flat shift speed;
When the vehicle speed enters the shift preliminary range, increasing the engine torque before shifting, applying the offset to the available torque of the shift speed control, and adjusting the torque response time constant setting value to induce rapid shift completion;
Hybrid vehicle control method comprising a.

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