KR100792892B1 - Method for detection and control engine full load of hev - Google Patents

Abstract

An engine full load detection control method of a hybrid vehicle is provided to satisfy the optimal demand torque of an engine by applying the same engine full load detection logic by an HCU(Hydraulic Control Unit) and an EMS(Engine Management System), if the HCU requires high demand torque. An engine full load detection control method of a hybrid vehicle comprises the steps of: controlling the engine full load detection of an HCU on the basis of detection value of an accelerator pedal sensor and vehicle speed sensors(S101,S102,S105); controlling the engine full load detection of an ECU(Engine Control Unit) receiving engine torque and engine speed by CAN-communicating with the HCU(S106,S108,S109); and selectively executing the controls of engine full load or part load after continuously executing the above two steps(S112,S113).

Description

Method for detection and control engine full load of HEV of hybrid vehicle

1 is a flowchart illustrating a method for controlling engine full load recognition of a hybrid vehicle according to the present invention;

2 is a system diagram for engine full load recognition control of a hybrid vehicle according to the present invention;

3 is a graph of a result of measuring an engine torque ratio, an engine speed, a vehicle speed, and the like after applying the engine full load recognition control method according to the present invention;

4 is a table and graph showing map data for a method for controlling engine full load recognition of a hybrid vehicle according to the present invention;

5 is a graph of a result of measuring an engine torque ratio, an engine speed, a vehicle speed, and the like before applying the engine full load recognition control method for a hybrid vehicle according to the present invention;

6 is a flowchart illustrating a method for controlling engine full load recognition of a gasoline vehicle;

7 is a system diagram for engine full load recognition control of a gasoline vehicle.

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

10: main controller 12: accelerator pedal sensor

14: vehicle speed sensor 20: engine controller

The present invention relates to an engine full load recognition control method for a hybrid vehicle, and more particularly, to a control method for detecting a full load state of an engine in a hard type hybrid vehicle.

In general, when the driving state of a vehicle is classified by load, it can be divided into idle state, part load state and full load state, and these load states are mixed with the engine. It is common to judge the opening angle of the throttle valve that controls the capacity.

That is, in the related art, when the driver depresses the accelerator pedal and the opening angle of the throttle valve becomes a predetermined angle (for example, 65 ° or more), the driver recognizes the full load. This condition is mainly applied to the rapid acceleration or overtaking of the vehicle. Applicable for high speed driving.

In the case of a conventional gasoline vehicle, a method of recognizing the full load of the engine is as shown in FIG. 7, when the accelerator pedal is above a predetermined angle by the detection of an accelerator pedal (APS). EMS) recognizes the engine as full load.

More specifically, the full load recognition control flow of the conventional gasoline vehicle is, as shown in the flow chart of Figure 6, the accelerator pedal operation step (S201); Inputting the angle detection value and the vehicle speed of the accelerator pedal sensor to the ECU (S202); Determining the opening degree of the accelerator pedal (S203); Recognizing the engine state as an engine full load state when the opening degree of the accelerator pedal is equal to or greater than the reference value (S204), and performing engine full load control (S205); When the opening degree of the accelerator pedal is equal to or less than the reference value, the engine state is recognized as the engine partial load state (S206), and the engine partial load control is performed (S207).

As such, in a gasoline vehicle, the accelerator pedal is connected to the engine's throttle valve (TPS) so that the throttle valve opens and closes linearly according to the angle thereof. It can be seen that.

Recently, a power source comprising an engine and a driving motor driven by a battery power source is provided, and a structure in which the above power source is properly applied to the front wheel is applied to the motor operated by the voltage of the battery when the vehicle starts or accelerates. Hybrid vehicles are being introduced that can lead to improved fuel economy with power assist.In the case of hard type hybrid vehicles, the accelerator pedal functions differently from gasoline vehicles.

That is, the accelerator pedal of the hybrid vehicle indicates the driver's will and is transmitted to each controller such as a motor and an engine in the form of a driving point (speed and torque) in the form of the required torque of the driver according to the vehicle speed.

Therefore, in the hybrid vehicle, the accelerator pedal and the throttle opening of the engine cannot be linear, but are controlled only in the required torque form.

Thus, the full load recognition of the engine in the hybrid vehicle can be seen through the driving point control of the engine.

Here, the overall control method of the hard type hybrid vehicle is as follows.

With the main controller (HCU: Hybrid Control Unit) as the center, it sends and receives speed and torque information through CAN communication for each detailed controller such as Motor Control Unit (MCU) and Engine Management System (EMS). To control.

More specifically, the main controller is an upper controller that controls the overall operation of the hybrid electric vehicle, and communicates with the motor controller, which is a lower controller, in a predetermined manner to control the torque, speed, and power generation torque of the motor as a driving source. In addition, it communicates with an engine control unit (ECU) that controls an engine generating power for voltage generation as an auxiliary power source and performs engine start-related relay control and fault diagnosis.

In addition, the main controller detects the temperature, voltage, current, state of charge (SOC), etc. of the battery as the main power source, and communicates with a battery management system (BMS) that manages the overall state of the battery and according to the state of the SOC. It controls torque and speed, and communicates with the Transmission Control Unit (TCU) which determines and controls the transmission ratio according to the vehicle speed and the driving demand of the driver so that the vehicle speed required by the driver is maintained.

At this time, the communication between the main controller and the lower controller, which is the upper controller, is performed through CAN communication to exchange information and transmit and receive control signals with each other.

On the other hand, the accelerator pedal of the hybrid vehicle uses an electronic pedal control (ETC) type, and its position is controlled wirelessly, and when the driver presses the accelerator pedal, it is converted into a driver's demand torque, and according to the speed of the vehicle, The torque is determined.

That is, the driver demand torque is set to the detection value of the accelerator pedal sensor and the mapping value for the vehicle speed, and the driving points of the motor, generator, and engine are determined according to the determined requested torque.

Therefore, the hybrid vehicle requires an engine full load control method different from the existing gasoline engine.

The present invention has been made in view of the above, and in the hard type hybrid vehicle, when there is a high demand torque from the main controller (HCU), the engine should enter the full load state, so the main controller and the engine controller By applying the same engine full load recognition logic (EMS) to recognize and enter the full load state of the engine, it is possible to satisfy the optimum required torque of the engine required by the vehicle, and to recognize the signal of the accelerator pedal sensor to the full load of the engine. An object of the present invention is to provide a method for controlling engine full load recognition of a hybrid vehicle that can be logically recognized by using an engine driving point when it cannot be used.

The present invention for achieving the above object is the engine full load recognition control step of the main controller (HCU) based on the detection value of the accelerator pedal sensor and the vehicle speed sensor; Hybrid after the engine full load recognition control step of the engine controller received the engine torque and the engine speed in the can communication with the main controller continuously proceeds, so that the engine full load or partial load control can be selectively performed An engine full load recognition control method of a vehicle is provided.

In a preferred embodiment, the engine full load recognition control step of the main controller comprises: inputting a detection value of the accelerator pedal sensor and a vehicle speed sensor together with the operation of the accelerator pedal to the main controller (HCU); Calculating a driver's required torque at the main controller; Calculating a driver's demand torque in the main controller to determine whether the engine torque corresponding thereto is the engine full load torque; Determining the full load engine operating point by the main controller if the engine torque is equal to or greater than the engine full load torque based on mapping data previously stored in the main controller; Transmitting, at the main controller, the engine torque and the engine speed for the full-load engine driving point control to the engine controller through can communication; If the engine torque is less than an engine full load torque based on mapping data previously stored in the main controller, determining a partial load engine operating point by the main controller; And transmitting, at the main controller, the engine torque and the engine speed for the partial load engine driving point control to the engine controller through can communication.

In another preferred embodiment, the engine full load recognition control step of the engine controller comprises: if the engine torque is equal to or greater than the engine full load torque based on mapping data previously stored in the engine controller, the engine state is changed to the engine full load state. Recognizing, and performing engine full load control by the engine controller; If the engine torque is less than the engine full load torque based on the mapping data stored in the engine controller, the engine state is recognized as the engine partial load condition, and the engine partial load control by the engine controller is performed. It is done.

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

1 is a flowchart illustrating a method for controlling engine full load recognition of a hybrid vehicle according to the present invention, and FIG. 2 is a system diagram for engine full load recognition control of a hybrid vehicle according to the present invention.

As described above, the hybrid controller unit (HCU) of the hybrid vehicle is an upper controller that collectively controls the overall operation, and communicates with the motor controller, which is a lower controller, in a predetermined manner so that torque, speed, and power generation of the motor as a driving source are controlled. It controls the amount of torque and communicates with an engine control unit (ECU) that controls an engine generating power for voltage generation as an auxiliary power source, and performs engine start-related relay control and fault diagnosis.

In addition, the main controller transmits and receives speed and torque information through CAN communication to each detailed controller such as an engine management system (EMS) and controls the vehicle.

At this time, the driver's demand torque is set to the detection value of the accelerator pedal sensor, the mapping value for the vehicle speed, and the operating point of the motor, generator, and engine is determined according to the determined required torque. The main point is that the engine full load recognition control by the engine controller proceeds continuously or simultaneously to satisfy the optimum required torque of the engine required by the vehicle.

That is, the engine full load recognition control step of the main controller (HCU) based on the detection values of the accelerator pedal sensor and the vehicle speed sensor, and the engine full load recognition of the engine controller received the engine torque and the engine speed through the can communication with the main controller. It is characterized in that the engine full load or partial load control can be selectively carried out after the control steps are continuously performed.

As a first step of the engine full load recognition control according to the present invention, the detected value of the accelerator pedal sensor 12 and the detected value of the vehicle speed sensor 14 together with the operation of the accelerator pedal S101 are transmitted to the main controller 10 (HCU). The input step S102 is performed.

Next, the step S103 of calculating the driver's requested torque in the main controller 10 proceeds.

The driver's requested torque is calculated through the required torque map according to the detected values of the vehicle speed and the accelerator pedal sensors 12 and 14 in the main controller 10, wherein the required torque map is data determined through mapping.

Subsequently, the main controller 10 calculates the driver's required torque and determines whether the engine torque corresponding thereto is the engine full load torque (S104).

At this time, if the engine torque is equal to or greater than the engine full load torque based on the mapping data pre-stored in the main controller 10, step S105 is performed in which the full load engine driving point is determined by the main controller.

In addition, the main controller 10 transmits the engine torque and the engine speed for the full-load engine driving point control to the engine controller 20 through can communication (S106).

On the other hand, if the engine torque is less than the engine full load torque based on the mapping data pre-stored in the main controller 10, step S110 in which the partial load engine operating point is determined by the main controller 10 is performed. .

In addition, the main controller 10 transmits the engine torque and the engine speed for the partial load engine driving point control to the engine controller 20 through can communication (S111).

At this time, as shown in Figure 4, the engine full load torque is a map according to the engine speed, the mapped data, and is shared with each other and stored in the main controller 10 and the engine controller 20.

After the engine full load recognition control by the main controller as described above, the engine full load recognition control by the engine controller is performed as follows.

The engine full load recognition control by the engine controller 20 is performed using data mapped with the engine full load torque as in the main controller 10 described above.

When the engine torque is equal to or greater than the engine full load torque based on the mapping data previously stored in the engine controller 20, the engine state is recognized as the engine full load state (SS108), and the engine power by the engine controller 20 is changed. Step S109 is performed in which load control is performed, whereas if the engine torque is smaller than the engine full load torque based on mapping data previously stored in the engine controller 20, the engine state is changed to the engine partial load state. Recognizing (S112), the step (S113) of the engine part load control by the engine controller 20 is carried out.

FIG. 3 is a graph of the results of measuring engine torque ratio, engine speed, vehicle speed, and the like before applying the engine full load recognition control method of the hybrid vehicle according to the present invention.

As shown in the graph of Figure 5, before applying the engine full load recognition control method according to the present invention, it was found that the vehicle speed is slowly increased despite the full load state by unrecognizing the engine full load.

On the other hand, as shown in the graph of Figure 3, applying the engine full load recognition control method according to the present invention, it was found that the engine speed is rapidly recognized by easily recognize the engine full load state.

As described above, as the main controller and the engine controller of the hybrid vehicle recognize and control the engine full load state, the control of the optimum torque required by the vehicle is provided.

As described above, according to the engine full load recognition control method of the hybrid vehicle according to the present invention, when there is a high demand torque from the main controller (HCU) in the hard type hybrid vehicle, the engine is not allowed to enter the full load state. Since the main controller and the engine controller (EMS) apply the same engine full load recognition logic to recognize and enter the full load state of the engine, it is possible to satisfy the optimum required torque of the engine required by the vehicle.

Claims (3)

An engine full load recognition control step of the main controller (HCU) based on the detected values of the accelerator pedal sensor and the vehicle speed sensor; An engine full load recognition control step of the engine controller which has received engine torque and engine speed in can communication with the main controller; The engine full load recognition control method for a hybrid vehicle, characterized in that the engine full load or partial load control can be selectively performed after. The method of claim 1, wherein the engine full load recognition control step of the main controller: Inputting the detected value of the accelerator pedal sensor and the detected value of the vehicle speed sensor to the main controller (HCU) together with the operation of the accelerator pedal; Calculating a driver's required torque at the main controller; Calculating a driver's demand torque in the main controller to determine whether the engine torque corresponding thereto is the engine full load torque; Determining the full load engine operating point by the main controller if the engine torque is equal to or greater than the engine full load torque pre-stored in the main controller; Transmitting, at the main controller, the engine torque and the engine speed for the full-load engine driving point control to the engine controller through can communication; Determining the partial load engine operating point by the main controller if the engine torque is less than the engine full load torque previously stored in the main controller; Transmitting, at the main controller, the engine torque and the engine speed for the partial load engine operating point control to the engine controller in a can communication; Engine full load recognition control method of a hybrid vehicle, characterized in that consisting of. The method according to claim 1 or 2, The engine full load recognition control step of the engine controller is: If the engine torque is equal to or greater than the full load torque pre-stored in the engine controller, recognizing the engine state as the engine full load state, and performing engine full load control by the engine controller; If the engine torque is less than the full load torque previously stored in the engine controller, recognizing an engine state as an engine partial load state and performing engine partial load control by an engine controller; Engine full load recognition control method of a hybrid vehicle, characterized in that consisting of.

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