KR101091669B1 - Method for controlling HCU and engine ECU of Hybrid Vehicle - Google Patents

Abstract

The present invention relates to a cooperative control method between the main controller of the hybrid vehicle and the engine control device. More specifically, the engine torque control is performed only by the torque command of the vehicle controller when entering the hybrid mode, and the command of the vehicle controller is ignored when the vehicle is stopped. And a cooperative control method between the main controller of the hybrid vehicle and the engine control apparatus for controlling the engine speed by the internal map of the engine controller.

To this end, the present invention includes a first control step of controlling the engine torque only by the torque command of the engine torque or the speed control message 1 of the vehicle controller when entering the hybrid mode in which the engine and the motor are mixed; A second control step of performing engine speed control by an internal map of the engine controller in a state in which the command of the vehicle controller is ignored when the vehicle is stopped; It provides a cooperative control method between the main controller of the hybrid vehicle and the engine control device comprising a.

Hybrid, vehicle, vehicle controller, engine, engine controller, cooperative control, method, motor, torque

Description

Cooperative control method between main controller and engine controller of hybrid vehicle {Method for controlling HCU and engine ECU of Hybrid Vehicle}

The present invention relates to a cooperative control method between the main controller of the hybrid vehicle and the engine control device. More specifically, the engine torque control is performed only by the torque command of the vehicle controller when entering the hybrid mode, and the command of the vehicle controller is ignored when the vehicle is stopped. And a cooperative control method between the main controller of the hybrid vehicle and the engine control apparatus for controlling the engine speed by the internal map of the engine controller.

A hybrid electric vehicle is a vehicle using two or more power sources, generally a hybrid electric vehicle driven using an engine and an electric motor.

Since the efficiency of the engine is lower than the efficiency of the electric motor during the initial start of the hybrid electric vehicle, it is advantageous in terms of fuel efficiency of the vehicle to start the initial start of the vehicle using an efficient electric motor. It enters the hybrid mode in which the engine and the electric motor are mixed.

On the other hand, in the controller provided in the hybrid electric vehicle, a vehicle control unit (Hybrid Control Unit), which is the highest level controller in charge of the overall control of the vehicle, is mounted, and each controller constituting the system is provided with a controller.

For example, an engine control unit for controlling the overall operation of the engine, a motor control unit (MCU) for controlling the overall operation of the electric motor, a transmission control unit (TCU) for controlling the transmission, a battery The battery management system (Battery Management System, BMS) for controlling the operation of the air conditioning controller (Full Auto Temperature Controller, FATC) for controlling the room temperature is provided.

These controllers are connected to a high-speed CAN communication line (for example, 500kbps) around the vehicle controller, and the upper controller transmits commands to the lower controller while transmitting and receiving information between the controllers.

As described above, in the hybrid electric vehicle, a plurality of controllers including the vehicle controller as the upper controller perform cooperative control with each other.

That is, the vehicle controller exchanges information with each controller through CAN communication, and also controls subordinate controllers. The vehicle controller may control engine torque and engine speed information, start key information, Throttle / engine temperature (cooling water temperature) information, etc., and the vehicle controller sends the fuel injection command, engine stop command, fuel injection prohibition command, electric motor start information, idle stop information, etc. to the engine controller. It is meant to be delivered.

In addition, the vehicle controller substantially controls the driving of the electric motor through the MCU. At this time, the MCU controls the driving torque and the driving speed of the electric motor, which is the driving source, in accordance with a control signal applied from the vehicle controller, the upper controller, to maintain driving performance. Let's go.

As described above, cooperative control between controllers is very important in a hybrid electric vehicle. Such cooperative control between the controllers is performed in all cases from the start until the user turns off the ignition key.

In particular, there are a myriad of cooperative control ranges such as starting stability, idling stability, oscillation acceleration, deceleration, idle stop, restart, and so on.

As an example of such cooperative control, referring to FIG. 1 attached to the cooperative control that is conventionally performed in the engine controller and the vehicle control period, the following description will be made.

When the accelerator pedal is pressed, the accelerator pedal value is input as an analog signal from the engine controller 20, and is broadcasted as an EEC2 message, which is a kind of can communication, and the vehicle controller receives the engine and motor according to the accelerator pedal value. Torque is distributed to the engine controller and the MCU which is the motor controller to enter the hybrid mode in which the vehicle is mixed. Then, the engine controller and the MCU apply torque to the engine and the motor according to the torque distribution command.

However, when the accelerator pedal is pressed, the engine responds itself according to the [Accel pedal value-torque map] stored in the engine controller, and at the same time, the vehicle controller sends a torque command to the engine according to the accelerator pedal value and the battery charge state (SOC). As a result, the engine received two torque commands, causing the vehicle to swing.

As a solution to this problem, as shown in the accompanying FIG. 2, a method of changing the [APS (acceleration position sensor) value-injection amount map] so as to follow the torque control command controlled by the vehicle controller is shown. Sought.

That is, by changing the engine fuel injection amount due to the accelerator pedal value to the idle injection amount in all the sections (hybrid driving mode), it is possible to prevent the vehicle from swinging by making it appear to execute a torque distribution command controlled by the vehicle controller. There is a problem in that the engine speed by the accelerator pedal cannot be controlled while the vehicle is stopped.

Therefore, although the vehicle controller reads the accelerator pedal value and controls the engine speed in proportion to the accelerator pedal value while the vehicle is stopped, there is a problem that the engine speed does not smoothly rise or fall, and the engine speed control is stopped when the vehicle stops. There is a problem that it is impossible to perform the idle up function of the engine in order to change the alternator load according to the load of the accessories (air conditioners, various electrical appliances).

The present invention has been made to solve the above problems, the engine torque or speed control message 1 (Torque and Speed Control 1) of the vehicle controller when entering the hybrid mode of driving the engine and the motor mixed according to the accelerator pedal value The engine torque is controlled only by the torque command, and when the vehicle is stopped, the engine speed is controlled by the internal map of the engine controller while the command of the vehicle controller is ignored. It is an object of the present invention to provide a cooperative control method between a main controller and an engine control apparatus of a hybrid vehicle in which engine rotation speed control is performed so that functions such as idle up can be easily performed.

The present invention for achieving the above object is a first control step of the engine torque control is performed only by the torque command of the engine torque or the speed control message 1 of the vehicle controller when entering the hybrid mode of driving the engine and the motor mixed; A second control step of performing engine speed control by an internal map of the engine controller in a state in which the command of the vehicle controller is ignored when the vehicle is stopped; It provides a cooperative control method between the main controller of the hybrid vehicle and the engine control device comprising a.

In the first control step, when the condition of the AND operator that becomes "hybrid entry flag = 1 (HEV_FLAG = 1)" by parameters input to the engine controller together with receiving the bit signal from the vehicle controller, Entering the hybrid mode, characterized in that the engine torque is applied by the override control mode by the engine torque or the speed control message-1 control of the vehicle controller, that is, the percentage torque according to the engine torque or the speed selection mode 1 or 2.

In the second control step, when the engine torque or the speed selection mode by the engine torque or the speed control message 1 control of the vehicle controller is set to 0 and the dummy data is transmitted from the vehicle controller to the engine controller, the engine controller The engine speed control is performed according to the fuel injection map embedded therein.

Through the above problem solving means, the present invention provides the following effects.

According to the present invention, the engine torque control is performed only by the engine torque of the vehicle controller or the torque command of the speed control message 1 when entering the hybrid mode in which the engine and the motor are mixed, and the vehicle controller ignores the command of the vehicle controller when the vehicle is stopped. By controlling the engine speed by the internal map of the engine controller, it is possible to prevent the vehicle from shaking, and at the same time, it is easy to control the engine speed in the stopped state, so that the engine idle-up function according to various accessory loads can be achieved. It offers the advantage of performing smoothly.

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

3 is a block diagram for the cooperative control method between the main controller and the engine control apparatus of the hybrid vehicle according to the present invention, FIG. 4 is a flowchart, and FIG. 5 is a control block diagram.

In the present invention, the engine torque is controlled only by the torque command of the engine torque of the vehicle controller or the speed control message 1 when the hybrid mode of the hybrid vehicle (particularly the bus) is used in a hybrid mode in which the engine and the motor are mixed. When the vehicle is stopped, the engine speed is controlled by the internal map of the engine controller while the command of the vehicle controller is ignored.

When the accelerator pedal value and various parameters for the engine operation are input to the engine controller, the hybrid entry flag (HEV_FLAG) is set with each parameter. If the hybrid entry, the hybrid entry flag = 1 (HEV_FLAG = 1), the hybrid me If it is an entry, then "hybrid entry flag = 0 (HEV_FLAG = 0)".

At the same time, the vehicle controller transmits a bit signal HEART SIGNAL to the engine controller at regular intervals.

When the bit controller receives the bit signal to the engine controller and the AND operator condition becomes "hybrid entry flag = 1 (HEV_FLAG = 1)" by the parameters input to the engine controller, the vehicle controller enters the hybrid mode. The engine is driven with an electric motor.

At this time, when the vehicle controller issues a torque command for driving the engine, the engine torque or speed control mode according to engine torque or speed control message-1 (T-function based Stream Cipher 1) control is set to 1. Or 2, to transmit different percentage torque values to the engine controller.
Here, the percent torque refers to 100% of the maximum torque that the engine can produce and means torque according to the ratio.
For example, if the engine's maximum power is 70 kgm, 100 percent is 70 kgm, so 20 percent torque is 14 kgm.

Accordingly, the engine controller torques the engine by the engine torque or the percent torque according to the override control mode 1 or 2 by the engine torque or T-function based Stream Cipher 1 control of the vehicle controller. Will be applied.

When entering the hybrid mode, when the engine torque or speed selection mode by the engine torque or speed control message-1 control of the vehicle controller is 1,2,3, the engine is in the driving state and the gear is D and R gears. In the neglected state of the internal map, the engine torque is controlled by the distribution torque by the engine torque or the speed selection mode according to the command of the vehicle controller.

As a result, engine torque control by the vehicle controller is executed (HEV_MODE = 1) while the [accelerator pedal value-torque map] built in the engine controller is ignored, and the engine selects engine torque or speed according to the command of the vehicle controller. The engine torque by mode is distributed.

Here, when the vehicle is stopped or the engine torque control is not required, the engine controller or the engine torque or speed selection mode according to the engine torque or speed control message 1 control of the vehicle controller is set to 0, and the dummy data is stored in the engine controller. Transmission to the engine mode (ENG = 0).

When the vehicle is stopped or when engine torque control is not required, that is, when the hybrid mode is not entered, the engine torque or speed selection mode by the engine torque or speed control message-1 control of the vehicle controller is 0, the engine is idle and the gear is neutral ( N gear), and the engine speed can be controlled by the internal map of the engine controller.

Accordingly, when the engine controller recognizes that the engine torque or speed selection mode of the vehicle controller is 0 and executes the engine mode (ENG = 0), the fuel injection amount of the engine is built in the engine controller [APS (acceleration position). Sensor) value-injection amount map].

Therefore, fuel is injected in accordance with the fuel injection map (APS (acceleration position sensor) value-injection amount map) built in the engine controller while the vehicle is stopped, so that functions such as idle-up according to the load of the accessory when the vehicle is stopped are easy. Can be performed.

As such, when the hybrid mode is entered, engine torque control is performed only by the vehicle controller, and when the vehicle is stopped, the fuel injection amount is determined by the internal map of the engine controller. The phenomenon can be easily prevented, and at the same time, the engine speed can be controlled even when the vehicle is stopped, so that the idle up function of the engine according to the load of the air conditioner (air conditioner, various electric appliances) can be smoothly performed. Can be done.

1 and 2 are schematic diagrams for explaining cooperative control that is conventionally performed in an engine controller and a vehicle control period;

3 is a block diagram for a cooperative control method between a main controller and an engine control apparatus of a hybrid vehicle according to the present invention.

4 is a flowchart illustrating a cooperative control method between a main controller and an engine control apparatus of a hybrid vehicle according to the present invention;

5 is a control block diagram of a cooperative control method between a main controller and an engine control apparatus of a hybrid vehicle according to the present invention;

Claims (3)

In the first control step in which the engine torque is controlled only by the engine torque of the vehicle controller or the torque command of the speed control message 1 when entering the hybrid mode in which the engine and the motor are mixed, and the vehicle controller ignores the command of the vehicle controller when the vehicle is stopped. A second control step of controlling engine speed by an internal map of the engine controller; In the first control step, the vehicle controller transmits a bit signal to the engine controller, and when the AND operator condition becomes " hybrid entry flag = 1 " according to parameters input to the engine controller, enters the hybrid mode. And the vehicle controller transmits different percentage torques to the engine controller by setting the engine torque or speed selection mode by the engine torque or speed control message-1 control to 1 or 2, wherein the engine torque or Transmits to the engine controller as a percentage torque according to speed selection mode 1 or 2, In the second control step, when the hybrid mode is not entered, when the engine torque or the speed selection mode by the engine torque or the speed control message 1 control of the vehicle controller is set to 0, and the dummy data is transmitted from the vehicle controller to the engine controller, And cooperative control method between the main controller of the hybrid vehicle and the engine controller according to a fuel injection map embedded in the engine controller. delete delete

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