KR101765538B1 - Apparatus and method for controlling engin of hybrid vehicle - Google Patents

Abstract

An engine torque learning apparatus and method for a hybrid vehicle is disclosed. The present invention is characterized in that the learning value for the engine torque obtained by executing the learning of the engine torque in the idling mode when there is the engine torque learning value and the engine torque learning execution completion data at the time of idling when the engine startup request signal is received, The engine start is performed after storing the execution completion data, and the learning value for the engine torque is executed when the vehicle is temporarily stopped while the vehicle is running and the mode is switched to the idling mode, thereby updating the learned value for the previously stored engine torque, Learning of the engine torque at the time is executed, and the engine can be controlled at the ideal air-fuel ratio.

Description

[0001] APPARATUS AND METHOD FOR CONTROLLING ENGIN OF HYBRID VEHICLE [0002]

The present invention relates to an apparatus and method for learning an engine torque of a hybrid vehicle, and more particularly, to a hybrid vehicle for temporarily stopping engine driving at the time of a temporary stop during running, And stopping the operation of the engine with the idle torque learning value obtained by executing the idle torque learning value.

A hybrid car is a next-generation car that dramatically reduces fuel consumption and emissions compared to conventional vehicles, such as installing both an internal combustion engine and a motor engine, and minimizing air resistance by drastically reducing the weight of the vehicle body. In many cases, harmful gas emissions can be reduced by more than 90% compared to existing vehicles, which can improve the air and environment of large cities, and is also called echo-car because it fits well with traffic control and road planning.

The hybrid vehicle uses a motor having an excellent torque characteristic in comparison with an engine that is an internal combustion engine in a region where the engine speed is low and an engine having a torque characteristic that is superior to that of the motor engine in a relatively middle or high speed region, It is possible to improve the fuel efficiency by providing an efficient power according to the driving state of the vehicle and to reduce the emission of harmful components of the exhaust to a minimum because the engine is not used at the low speed operation have.

In the case of such a hybrid vehicle (or similar hybrid vehicle), it is necessary to start the engine operation in the engine cooling state to raise the temperature of the engine, or in the case where it is necessary to charge the battery to generate electricity by rotation of the engine, The idling mode is selected. However, learning can not be performed on the engine torque under the above-described condition, which is a relatively short time compared to the operation time, and the optimum engine condition can not be maintained when idling. Therefore, in the hybrid vehicle, a separate logic is required for learning about the engine torque when idling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object to be achieved by the present invention is to provide an engine torque control system, When the engine torque learning value obtained by executing the engine torque learning for a predetermined period at a predetermined period when the vehicle is temporarily stopped while the vehicle is running and is switched to the idling mode is decreased to a value lower than a predetermined judgment allowable value, And an engine torque learning apparatus and method for a hybrid vehicle capable of controlling an engine at an ideal air-fuel ratio by executing learning about engine torque at idling in a hybrid vehicle by storing engine torque learning completion information.

According to an aspect of the present invention, there is provided an apparatus for learning an engine torque of a hybrid vehicle,

And a hybrid control unit that provides the power of one of the engine and the motor as a speed change stage based on the engine speed, wherein the engine control unit controls the engine,

The engine control unit includes:

An engine start condition determining unit for determining whether a learning value for the engine torque and engine torque learning execution completion data are stored when the engine is requested to start,

An idling mode switching section for switching the engine to the idling mode after executing the engine starting if the learning value for the engine torque and the engine torque learning execution completion data do not exist in the engine starting condition determining section;

An engine torque executing section for performing learning on the engine torque at predetermined intervals for a predetermined period of time after the idling mode switching by the idling mode switching section and accumulating the engine torque control values for each predetermined period and setting the engine torque control value as an engine torque learning value,

A comparison unit for determining whether the engine torque learning value set in the engine torque execution unit is less than or equal to a predetermined threshold value,

And a storage unit for storing the engine torque learning execution completion data after setting the engine torque control value accumulated in the engine torque execution unit as the engine torque learning value based on the comparison result of the comparison unit.

Preferably, the engine control unit includes:

When the vehicle is temporarily stopped during driving, the mode is switched to the engine idling mode to perform learning on the engine torque, and to update the engine torque learning value previously stored in the obtained engine torque learning value.

According to another aspect of the present invention, there is provided an engine torque learning method for a hybrid vehicle,

And transmitting the power of one of the engine or the motor generated through the engine control unit or the motor control unit to the transmission based on the engine revolution number in the hybrid control unit,

A first step of checking whether a learned value of the engine torque and engine torque learning execution completion data are stored in the idling mode when the engine start request signal is received;

If the learning value for the engine torque in the idling mode and the engine torque learning execution completion data are not stored in the first step, the engine is started according to the control of the hybrid control unit, the engine is switched to the idling mode, And a second step of executing the second step.

And a third step of storing the engine torque learning value and the engine torque learning execution completion data after setting the engine torque control value of the predetermined period obtained in the second step as a learning value for the engine torque and then starting the engine .

Preferably, the method further comprises:

In the third step, the engine torque learning value of the third stage is renewed with the engine torque learning value obtained by learning the engine torque after switching to the idling mode when the vehicle is temporarily stopped during running after the engine is started And a fourth step.

Preferably, the second step comprises:

Learning is performed on the engine torque received in a predetermined period for a predetermined time and accumulated when the engine torque control value of each predetermined period is equal to or greater than a predetermined reference value.

Preferably, in the third step,

And stores the engine torque learning value and the engine torque learning execution completion data after setting the engine torque control value accumulated when the engine torque control value is equal to or less than a predetermined judgment allowable value to the engine torque learning value.

As described above, an engine torque learning apparatus and method of a hybrid vehicle according to the present invention is characterized in that when an engine start request signal is received and an engine torque learning value at idling and engine torque learning execution completion data are present, The learning value for the engine torque obtained by executing the learning of the torque and the engine torque execution completion data are stored and then the engine start is executed and the learning value for the engine torque is executed when the vehicle is temporarily stopped during the running and is switched to the idling mode, By updating the learned value for the stored engine torque, the hybrid vehicle also learns about the engine torque when the engine is idling so as to control the engine at the ideal air-fuel ratio.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
1 is a view showing a configuration of a hybrid vehicle according to an embodiment of the present invention.
FIG. 2 is a detailed view showing the configuration of the engine control unit shown in FIG. 1. FIG.
3 is a flowchart illustrating an engine torque learning process of a hybrid vehicle according to another embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 1 is a view showing a configuration of a hybrid vehicle according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of the hybrid control unit shown in FIG. 1 in detail.

As shown in Figs. 1 and 2, the hybrid vehicle includes an engine control unit 10 for controlling the engine, a motor control unit 30 for controlling the motor, And a hybrid control unit 50 that provides one power to the speed change stage.

As shown in FIG. 2, the engine control unit 10 is switched to the idling mode when the engine is requested to start, and checks whether the learning value of the engine torque and the engine torque learning execution completion data are stored. Then, An engine starting condition judging section (11) for judging whether or not the engine torque learning execution completion data is satisfied, and an engine starting condition determining section (11) And an idle mode switching section (13) for switching the mode to the idle mode switching section. The idle mode switching section learns the engine torque at predetermined intervals for a predetermined period of time after switching to the idle mode and accumulates the engine torque control values An engine torque learning execution unit 15 that sets the engine torque learning value to an engine torque learning value, (17) for judging whether or not the engine torque learning value is less than or equal to a predetermined judgment allowable value, and an engine torque learning value stored in the engine torque executing section based on the comparison result of the comparing section (17) And a storage unit 19 for storing data.

In addition, the engine control unit 10 may be configured to switch to the engine idling mode to perform learning about the engine torque when the vehicle is temporarily stopped while driving.

That is, when the engine start request signal is received, the engine start condition determining unit 11 determines whether or not the engine torque learning value and the engine torque learning execution completion data exist at idling, and the determination result is provided to the idling mode switching unit 13 do.

The idling mode switching unit 13 switches the engine to the idling mode if the engine torque learning value at idling and the engine torque learning execution completion data do not exist.

That is, when the vehicle is stopped, the engine is switched to the idling mode, and the engine torque learning execution unit 15 of the engine control unit 10 performs learning about the engine torque during the idling while the engine is switched to the idling mode. At this time, the engine control unit 10 controls the ignition angle to adjust the output torque so that the engine speed is most stable with respect to the target engine speed under the current temperature and the engine load condition. In this case, the engine torque control value received for a predetermined period of time at predetermined intervals is added to or subtracted from the engine torque control value, and the engine is controlled so that the idling control is appropriately performed.

For example, if the change in the engine speed is large during idling, the engine torque control value increases the acceleration / deceleration torque, and if the engine speed changes little, the engine torque control value decreases / decreases the torque. The engine torque control value added / subtracted during idling is cumulatively stored as a learned value, and the stored learned value is taken into account as deviation and reflected in the engine torque control. Through this learning, the fluctuation range of the engine speed during idling constantly becomes smaller and stabilized, and the amount of change of the acceleration / deceleration torque becomes smaller as the learning is performed. If the amount of change in the increase / decrease torque that was large at the beginning of learning becomes smaller than the allowable value (<0.05 Nm) as learning progresses, it is determined that the learning has progressed sufficiently in the current condition and the engine torque learning value, which is the cumulative engine torque control value, The data is stored in the storage unit 19

The learning value for the engine torque and the engine torque learning execution completion data are present since the learning values for the engine torque at the time of idling are all reset while the engine control unit 10 is reset or initialized or the vehicle is checked at the vehicle production line The engine control unit 10 transmits an engine start request signal to the hybrid control unit 50 and the hybrid control unit 50 starts the engine at the request of the engine control unit 10. [

The engine control unit 10 executes the engine control after the engine start according to the engine start request of the hybrid control unit 50 to maintain the idle mode and then learns the engine torque. Learning about the engine torque during idling varies the target engine speed according to the coolant temperature, the engine oil temperature, or the ambient temperature, so the learning value for the engine torque also varies.

On the other hand, in the engine start determination condition section 11, when there is a learning value for the engine torque at the time of idling and data for executing the engine torque learning execution, the hybrid control section 50 causes the engine control section 10 to stop the engine And in response to the request, the engine control unit 10 switches the engine to the idling mode.

In addition, when the battery for driving the hybrid vehicle needs to be charged or the temperature of the exhaust system must be raised for air purification, or the idling mode switching condition is satisfied for some reason, the hybrid control unit 50 causes the engine control unit 10 to perform idling The engine control unit 10 executes the learning of the engine torque to update the learning value for the engine torque while performing such idling.

According to the embodiment of the present invention, when there is the engine torque learning value at the time of idling and the engine torque learning execution completion data when the engine start request signal is received, learning value of the engine torque obtained by executing learning of the engine torque in the idling mode And the engine torque execution completion data, and executes the engine start. When the vehicle is temporarily stopped while the vehicle is running and is switched to the idling mode, the learning value for the engine torque is executed to update the learned value for the previously stored engine torque, It is possible to control the engine at the abnormal air-fuel ratio by executing learning about the engine torque when idling in the vehicle.

 When the engine start request signal is received and the engine start condition including the learning value for the engine torque at the time of idling and the engine start condition including the engine torque learning execution completion data is not satisfied, a series of processes for executing the learning about the engine torque after switching the idle mode Will be described in more detail with reference to FIG.

FIG. 3 is a flowchart showing an engine torque learning process of the engine control unit of FIG. 2. Referring to FIGS. 1 to 3, an engine torque learning process of a hybrid vehicle according to another embodiment of the present invention will be described.

First, when an engine start request signal is received (step 101), the engine control unit 10 determines whether there is a learning value for the engine torque at idling and engine torque learning execution completion data, When it is determined that the learning value and the engine torque learning execution completion data do not exist (step 103), the hybrid control unit 50 requests the engine control unit 10 to start the engine through the step 105, The engine control unit 10 switches to the idling mode after starting the engine.

Next, the engine control unit 10 executes the learning of the engine torque at a predetermined cycle at step 107 to generate the engine torque control value.

At this time, it is determined in step 109 whether the engine torque control value is equal to or greater than the determination allowable value. If the engine torque control value is equal to or greater than the determination allowable value, the engine torque control value is accumulated with the engine torque control value in the previous cycle.

On the other hand, if it is determined in step 109 that the engine torque control value is not equal to or greater than the determination allowable value, the engine controller 10 proceeds to step 111 to set the accumulated engine torque control value to the engine torque learning value and then proceeds to step 113 do.

If it is determined in step 113 that the predetermined time has elapsed, the engine controller 10 determines the engine torque learning value and the engine torque learning execution completion data generated in step 111, (115).

After the engine is started, the vehicle is driven according to the driver's request.

If it is determined in step 103 that there is data on the engine torque during idling and engine torque learning execution completion data, the engine is judged whether the engine has been switched to the idling mode (step 117) , And if the engine is in the idling mode, the learning of the engine torque described above is performed, and the engine torque learning value stored in step 111 is updated with the obtained engine torque learning (step 119)

According to the embodiment of the present invention, when there is the engine torque learning value at the time of idling and the engine torque learning execution completion data when the engine start request signal is received, learning value of the engine torque obtained by executing learning of the engine torque in the idling mode And the engine torque execution completion data, and executes the engine start. When the vehicle is temporarily stopped while the vehicle is running and is switched to the idling mode, the learning value for the engine torque is executed to update the learned value for the previously stored engine torque, It is possible to control the engine at the abnormal air-fuel ratio by executing learning about the engine torque when idling in the vehicle.

When there is an engine torque learning value and engine torque learning execution completion data at idling when an engine start request signal is received, learning value of engine torque obtained by executing learning of engine torque in idling mode and engine torque execution completion data The learning value for the engine torque is executed to update the learning value for the previously stored engine torque, so that the hybrid vehicle is able to perform the engine torque control for the idling engine torque And the engine can be controlled at an ideal air-fuel ratio by executing learning of the engine torque and the reliability of the engine torque learning apparatus and method of the hybrid vehicle. Further, Or the possibility of sales is not only sufficient but also This is an invention that is industrially applicable because it can be practiced.

Claims (6)

And a hybrid control unit that provides the power of one of the engine and the motor as a speed change stage based on the engine speed, wherein the engine control unit controls the engine,
The engine control unit includes:
An engine start condition determining unit for determining whether a learning value for the engine torque and engine torque learning execution completion data are stored when the engine is requested to start,
An idling mode switching section for switching the engine to the idling mode after executing the engine starting if the learning value for the engine torque and the engine torque learning execution completion data do not exist in the engine starting condition determining section;
An engine torque learning executing section for performing learning on the engine torque at predetermined intervals for a predetermined period of time after the idling mode switching by the idling mode switching section and accumulating the engine torque control values of each predetermined period as the engine torque learning value ,
A comparison unit for determining whether the engine torque learning value set in the engine torque learning execution unit is equal to or less than a predetermined threshold value,
And a storage unit for storing the engine torque learning execution completion data after setting the engine torque control value accumulated in the engine torque learning execution unit as an engine torque learning value based on the comparison result of the comparison unit. Learning device. The engine control system according to claim 1,
And when the vehicle is temporarily stopped while the vehicle is running, the mode is switched to the engine idling mode to perform learning on the engine torque, and to update the engine torque learning value previously stored in the obtained engine torque learning value Device. And transmitting the power of one of the engine or the motor generated through the engine control unit or the motor control unit to the transmission based on the engine revolution number in the hybrid control unit,
A first step of checking whether a learned value of the engine torque and engine torque learning execution completion data are stored in the idling mode when the engine start request signal is received,
If the learning value for the engine torque in the idling mode and the engine torque learning execution completion data are not stored in the first step, the engine is started according to the control of the hybrid control unit, the engine is switched to the idling mode, A second step of executing the second step,
And a third step of storing the engine torque learning value and the engine torque learning execution completion data after setting the engine torque control value of the predetermined period obtained in the second step as a learning value for the engine torque and then starting the engine Wherein the engine torque is calculated based on the engine torque. 4. The method of claim 3,
In the third step, the engine torque learning value of the third stage is renewed with the engine torque learning value obtained by learning the engine torque after switching to the idling mode when the vehicle is temporarily stopped during running after the engine is started And a fourth step of estimating the engine torque of the hybrid vehicle. 5. The method according to claim 4,
Wherein learning is performed on an engine torque received in a predetermined period during a predetermined time and accumulated when the engine torque control value of each predetermined period is equal to or greater than a predetermined reference value. 6. The method according to claim 5,
And storing the set engine torque learning value and the engine torque learning execution completion data after setting the accumulated engine torque control value to the engine torque learning value when the engine torque control value is equal to or less than a predetermined judgment allowable value. A method of learning an engine torque of a vehicle.

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