WO2019225179A1

WO2019225179A1 - Control device and control method

Info

Publication number: WO2019225179A1
Application number: PCT/JP2019/015248
Authority: WO
Inventors: 章広小森; 佐藤　真也; 勝洋星野
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2018-05-25
Filing date: 2019-04-08
Publication date: 2019-11-28
Also published as: JPWO2019225179A1; JP7026217B2; DE112019001382T5

Abstract

Provided is a control device capable of improving the accuracy of valve control by increasing opportunities for learning of valve operation during vehicle use. To achieve this, provided is a control device 70 for controlling the operation of a valve in a hybrid vehicle 100 comprising an internal combustion engine 10 having at least one valve (for example, a throttle valve 15 or an EGR valve 19), a motor 50 for driving the hybrid vehicle 100, and a generator 20 driven by the internal combustion engine 10, said control device 70 comprising: an internal combustion engine control unit 741 that controls the internal combustion engine 10 so that the operating point of the internal combustion engine 10 becomes a preset learning operating point in a motor drive mode in which the hybrid vehicle 100 is driven by the motor 50; and a valve operation learning unit 742 for learning the operation of the valve in a state in which the operating point of the internal combustion engine 10 is controlled by the internal combustion engine control unit 741 to be the learning operating point.

Description

Control apparatus and control method

The present invention relates to a control device and a control method.

In recent years, hybrid vehicles equipped with a motor and an internal combustion engine have become widespread. In such a hybrid vehicle, low fuel consumption and low exhaust performance can be realized by driving around a high-efficiency operation region of a motor or an internal combustion engine in accordance with the motion state of the vehicle.
On the other hand, in order to achieve further low fuel consumption and low exhaust performance of hybrid vehicles, improvement in thermal efficiency of the internal combustion engine is required, and as one of the technologies for that purpose, a part of the exhaust gas is transferred to the intake side through external piping. External EGR (Exhaust Gas Recirculation) for reflux is known. External EGR is further divided into high pressure EGR (High Pressure-EGR: HP-EGR) and low pressure EGR (Low Pressure-EGR: LP-EGR). Hereinafter, there is an advantage that it is also referred to as an EGR region).

This LP-EGR is provided with an EGR valve for adjusting the amount of exhaust gas recirculated to the intake side, and the amount of exhaust gas recirculated to the intake side is adjusted by controlling the opening of the EGR valve. Control is performed so that the EGR rate becomes the target EGR rate. As the control of the EGR valve, feed forward (FF) control and feedback (Feed Back: FB) control are used to improve the accuracy of the LP-EGR control. Further, in the feedback control of the EGR valve, the correction value of the opening degree of the EGR valve is stored as a learned value, and the control accuracy of the EGR valve can be improved by using the learned value stored in the next operation.

However, in this type of LP-EGR, since the path from the EGR valve to the cylinder on the intake side is long, the response delay of EGR during feedback control becomes large. Even if the EGR valve is controlled so as to eliminate the difference between the target EGR rate and the actual EGR rate by applying feedback control to LP-EGR, it takes time to eliminate the difference due to the response delay described above. The EGR valve operates excessively. As a result, in the control of the EGR valve, an overshoot or undershoot of the control amount may occur. In order to prevent such overshoot and undershoot of the control amount, a method of reducing the gain of feedback control can be considered. However, if the gain is reduced, the time until the feedback control converges becomes longer, and it is not suitable for feedback control or learning control during transient operation where the control amount changes abruptly. There is a risk of mislearning.

Patent Document 1 discloses a control device that can prevent misfiring and rotational fluctuations by preventing mislearning of the control amount of the EGR valve, and can suppress a decrease in fuel consumption. .

JP 2010-216436 A

In the control device disclosed in Patent Document 1, learning of the EGR valve is limited to be performed only during steady operation of the internal combustion engine in order to prevent erroneous learning, and it is provided in advance based on the rotational speed of the internal combustion engine and the accelerator opening. If the predetermined threshold value is exceeded, it is determined that the internal combustion engine is in a transient operation state, and learning of the EGR valve is prohibited (see FIG. 9).

However, there are few scenes where actual vehicle operation is performed in steady operation, and there is a problem that the opportunities for learning are limited. Moreover, the driving | operation area | region which can be learned is decided by the driver | operator's driving | operation method, There existed a problem that the learning in the driving | operation area | region where the improvement of the precision of EGR control is calculated | required may not necessarily be implemented. The same can be said for this problem not only for the EGR valve but also for other valves provided in the internal combustion engine.

Therefore, an object of the present invention is to provide a control device capable of improving the accuracy of valve control by increasing the learning opportunities for valve operation when the vehicle is used.

In order to solve the above problems, in a vehicle including an internal combustion engine having at least one valve, a motor for driving the vehicle, and a generator driven by the internal combustion engine, control for controlling the operation of the valve An internal combustion engine control unit that controls the internal combustion engine so that an operating point of the internal combustion engine becomes a preset operating point for learning in a motor drive mode in which the vehicle is driven by the motor; And a valve operation learning unit that learns the operation of the valve in a state in which the operation point of the internal combustion engine is controlled to be the learning operation point by the internal combustion engine control unit.

According to the present invention, it is possible to provide a control device capable of improving the accuracy of valve control by increasing the learning opportunities of valve operation when the vehicle is used.

It is a schematic block diagram of the hybrid vehicle by which the control apparatus concerning 1st Embodiment is mounted. It is a schematic block diagram of an internal combustion engine. It is a block diagram explaining the hardware constitutions of a control apparatus. It is a figure explaining the operation point for learning in the operation region of an internal combustion engine. It is a figure explaining control of the opening degree of an EGR valve. It is a flowchart of the basic control by a control apparatus. It is a flowchart of the basic control by the control apparatus concerning 2nd Embodiment. It is a flowchart of the basic control by the control apparatus concerning 3rd Embodiment. It is a figure explaining the EGR control concerning a prior art example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment, a case where the control device 70 according to the present invention is applied to learning and control of the operation of the EGR valve 19 provided in the internal combustion engine 10 will be described as an example.
<Configuration of hybrid vehicle>
FIG. 1 is a schematic configuration diagram of a hybrid vehicle 100 equipped with a control device 70 according to the first embodiment.
As shown in FIG. 1, the hybrid vehicle 100 includes an internal combustion engine 10 and a generator 20 that is coaxially connected to the internal combustion engine 10. The generator 20 or the generator 20 is connected to the hybrid vehicle 100 by the internal combustion engine 10. Are selectively driven with different in-vehicle devices. As described above, a hybrid vehicle that uses the internal combustion engine 10 only for driving a generator 20 or a vehicle-mounted device different from the generator 20 and does not use it for direct driving of the vehicle may be called a series hybrid vehicle. A power converter 30 is connected to the generator 20, and the power converter 30 converts the three-phase AC power generated by the generator 20 into DC power. A battery 40 is connected to the power converter 30, and the DC power converted by the power converter 30 is stored in the battery 40. The hybrid vehicle 100 is equipped with a motor 50 for driving the hybrid vehicle 100, and the electric power stored in the battery 40 is supplied to the motor 50 via the power converter 30. The driving force of the motor 50 is transmitted to the axle 65 via the reduction gear 60, and the driving force is generated in the hybrid vehicle 100 when the tire 66 is rotated by the rotation of the axle 65. The internal combustion engine 10 is started when the remaining amount of the battery 40 is less than a predetermined threshold value, and drives the generator 20 to charge the battery 40. Further, a control device 70 (Electronic Control Unit: ECU) is connected to the internal combustion engine 10, and the control device 70 controls the opening operation of various valves provided in the internal combustion engine 10 and the opening operation of various valves. Learning is performed.

<Configuration of internal combustion engine>
Next, the configuration of the internal combustion engine 10 will be described.
FIG. 2 is a schematic configuration diagram of the internal combustion engine 10.
As shown in FIG. 2, the internal combustion engine 10 includes an air flow sensor 11 that measures the amount of air newly sucked from outside, a compressor 12 that performs supercharging to suck more intake gas, An intercooler 13 that cools the supplied suction gas and a throttle valve 15 that adjusts the amount of suction gas sucked into the cylinder 14 are provided. A throttle sensor 151 for detecting the throttle opening degree of the throttle valve 15 is provided in the vicinity of the throttle valve 15. A spark plug 141 that ignites the mixed gas in the cylinder 14 of each cylinder, a fuel injector 142 that injects fuel into the cylinder 14 of each cylinder, and a mixed gas of fuel and air that flows into the cylinder 14 is compressed. The piston 143 that adjusts, the intake valve 144 that adjusts the amount of mixed gas flowing into the cylinder 14, the exhaust valve 145 that discharges the exhaust gas after combustion, and the signal of the signal rotor 147 attached to the crankshaft 146 are detected. A crank angle sensor 148 and a water temperature sensor 149 for measuring the cooling water temperature of the internal combustion engine 10 are provided.

Further, the internal combustion engine 10 is provided with a turbine 16 that transmits the kinetic energy of the exhaust gas to the compressor 12 through a shaft, and a three-way catalyst 17 that purifies harmful substances in the exhaust gas. An A / F sensor 171 that detects the concentration of oxygen contained in the exhaust gas is provided in the vicinity of the three-way catalyst 17. Further, an exhaust passage downstream of the three-way catalyst 17 (turbine 16) and an intake passage upstream of the compressor 12 are connected to suck a part of exhaust gas (hereinafter also referred to as EGR gas) from the exhaust passage. A low-pressure EGR pipe 18 returning to the flow path and an EGR valve 19 for adjusting a return amount of EGR gas to the intake flow path provided in the low-pressure EGR pipe 18 are provided. Further, an EGR cooler 181 for cooling EGR gas flowing through the low pressure EGR pipe is provided on the upstream side of the EGR valve 19.

Output signals from various sensors such as the throttle sensor 151, the air flow sensor 11, the crank angle sensor 148, the water temperature sensor 149, the A / F sensor 171, and the accelerator sensor 80 (see FIG. 3) are input to the control device 70.

<Control device>
Next, the hardware configuration of the control device 70 will be described.
FIG. 3 is a block diagram illustrating the hardware configuration of the control device 70.
As shown in FIG. 3, in the control device 70, output signals from the various sensors described above are input to the input circuit 71. After performing signal processing such as noise removal of output signals from various sensors in the input circuit 71, the signal processed signal is transmitted to the input / output port 72. The signal transmitted to the input / output port 72 is stored in the RAM 73.

The signal stored in the RAM 73 is processed by the CPU 74. A control program describing the contents of the arithmetic processing is written in advance in the ROM 75, and each function is implemented by the CPU 74 executing the control program written in the ROM 75, and predetermined arithmetic processing is performed by each of the implemented functions. Is done. A value representing the operation amount of each actuator calculated by the CPU 74 according to the control program is stored in the RAM 73 and then transmitted to the input / output port 72. For example, a drive signal for controlling the opening degree of various valves such as the EGR valve 19 is output via a valve drive circuit 76 to a motor (not shown) that drives the various valves. A drive signal for realizing the target opening degree of the throttle valve 15 is output via a throttle valve drive circuit 77 to a motor (not shown) that drives the throttle valve 15. The drive signal of the fuel injection device 142 is set to an ON / OFF signal that turns ON when the valve is opened and OFF when the valve is closed, and is amplified to a sufficient energy for the fuel injection device 142 to drive the fuel injection device 142. And supplied to the fuel injection device 142. The operation signal output to the spark plug 141 is set to an ON / OFF signal that is ON when current is supplied to a primary coil (not shown) provided in the ignition output circuit 79 and OFF when no current is supplied. Is done. The ignition timing of the spark plug 141 is the time when the current changes from ON to OFF. A signal supplied to the spark plug 141 set in the input / output port 72 is amplified to a sufficient energy necessary for ignition by the ignition output circuit 79 and then supplied to the spark plug 141. The control device 70 performs feedback control that sequentially corrects the fuel injection amount or the intake air amount using the output value of the A / F sensor 171 so that the purification efficiency of the three-way catalyst 17 is optimized.

In the present invention, when the CPU 74 of the control device 70 determines that it is necessary to learn the opening degree of the EGR valve 19, the internal combustion engine 10 is in the generator drive mode in which only the generator 20 is driven by the internal combustion engine 10. The internal combustion engine 10 is controlled so that the operating point becomes a learning operating point set according to the frequency of use of the EGR valve 19 (for example, high frequency usage), and feedback control is performed in a steady state at the learning operating point. Is performed, the correction value of the opening degree of the EGR valve 19 is learned.

As described above, in the hybrid (series hybrid) vehicle 100 that uses the output of the internal combustion engine 10 for driving the generator 20 and driving other vehicle-mounted devices, when the remaining amount of the battery 40 is equal to or less than a threshold value, The generator 20 is driven by the internal combustion engine 10 to start power generation.
When the internal combustion engine 10 is driving the generator 20 in order to charge the battery 40, the internal combustion engine 10 is driven in the driving | operation area | region used as optimal fuel consumption. In the embodiment, as shown in FIG. 4, when the CPU 74 determines that learning of the operation of the EGR valve 19 is necessary, the operating point of the internal combustion engine 10 in the internal combustion engine 10 driving the generator 20 is determined. The internal combustion engine 10 (engine speed and engine torque) is controlled so that becomes a learning operation point preset for learning (for example, learning operation points 310 to 340). FIG. 4 illustrates the case where four learning operation points 310, 320, 330, and 340 are set as learning operation points of the EGR valve 19, but the number of learning operation points set is limited to this. Instead, the number and position of the operating points can be determined arbitrarily. Here, the operating point of the internal combustion engine 10 means an operating state determined by the rotational speed and torque of the internal combustion engine 10.

As shown in FIG. 3, the CPU 74 has an internal combustion engine control unit 741 that controls the internal combustion engine 10 so that the operating points of the internal combustion engine 10 become preset operating points 310 to 340 (see FIG. 4). A valve operation learning unit 742 that learns the operation of the EGR valve 19 in a state where the operation point of the internal combustion engine 10 is controlled to be the learning operation points 310 to 340 by the internal combustion engine control unit 741; The processing in the internal combustion engine control unit 741 and the valve operation learning unit 742 is performed in a generator drive mode in which only the generator 20 is driven by the internal combustion engine 10 and a vehicle-mounted device (not shown) different from the generator 20 is not driven. Executed. In the state where only the generator 20 is driven by the internal combustion engine 10, the hybrid vehicle 100 is driven by the motor 50, and thus the above-described generator drive mode may be referred to as a motor drive mode. In this generator drive mode (or motor drive mode), the internal combustion engine 10 does not directly drive an in-vehicle device (not shown) other than the generator 20, so that the internal combustion engine 10 can be operated arbitrarily. You can drive at the spot.

Further, the CPU 74 has an operating point setting unit 743 that sets a plurality of learning operating points within the operating range of the internal combustion engine 10. The operating point setting unit 743 is a learning operating point (for example, a diagram) based on the frequency that the operating point of the internal combustion engine 10 passes when the internal combustion engine 10 drives a vehicle-mounted device (not shown) different from the generator 20. Learning operation points 310 to 340) shown in FIG. For example, the operating point setting unit 743 passes relatively frequently (for example, a plurality of times or a predetermined number of times or more) compared to other operating points when driving the in-vehicle device (not shown) by the internal combustion engine 10. Set the operating point as the operating point for learning. Note that the fact that the operating point of the internal combustion engine 10 passes relatively frequently means that the EGR valve 19 is frequently used.

Further, the CPU 74 has a valve control unit 744 that controls the EGR valve 19 based on the operation of the EGR valve 19 learned by the valve operation learning unit 742. The valve control unit 744 outputs a drive signal based on the operation of the valve opening amount of the EGR valve 19 learned by the valve operation learning unit 742 to the valve drive circuit 76 when the operation state of the internal combustion engine 10 is an excessive state. As a result, a drive signal for driving the EGR valve 19 is output to a valve drive motor (not shown) via the valve drive circuit 76, and the drive of the EGR valve 19 is controlled.

As described above, based on the passing frequency of the operating point of the internal combustion engine 10, a plurality of learning operating points 310 to 340 for learning the operation of the EGR valve 19 are preset by the operating point setting unit 743. . In the hybrid vehicle 100, the internal combustion engine 10 mounted on the hybrid vehicle 100 starts power generation by driving the generator 20 after the internal combustion engine 10 is started when the remaining amount of the battery 40 is low. The CPU 74 of 70 can learn the opening correction value of the EGR valve 19. The internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operation points of the internal combustion engine 10 become preset learning operation points 310 to 340 in the generator drive mode. The valve operation learning unit 742 controls the engine speed and the engine torque of the internal combustion engine 10 by the internal combustion engine control unit 741 so that the operation point of the internal combustion engine 10 becomes the learning operation points 310 to 340 set in advance. In this state, feedback control is performed as shown in FIG. 5, and a correction value for the opening degree of the EGR valve 19 when the internal combustion engine 10 is in a steady state is stored in the RAM 73. The valve operation learning unit 742 stores the opening correction value of the EGR valve 19 in the steady state at all the learning operation points in the RAM 73, so that the opening correction value of the EGR valve 19 at each learning operation point ( Learning). The internal combustion engine controller 741 learns the operating point of the internal combustion engine 10 after learning of the opening correction values (operations) of the EGR valve 19 at all the learning operating points 310 to 340 set in advance. The engine speed and engine torque of the internal combustion engine 10 are controlled so as to return to the operating point at which optimum fuel consumption is achieved from the points 310 to 340.

<Control method>
Next, a control method of the learning control of the operation of the EGR valve 19 described above will be described with reference to FIG.
The valve operation learning unit 742 determines whether to start learning the correction value of the opening degree of the EGR valve 19 (step 110), and determines that it is the learning start timing (step 111: Yes), Proceed to step 112. On the other hand, when it is determined that it is not the learning start timing (step 111: No), the valve operation learning unit 742 returns to step 110 and waits until it is determined as the learning start timing.

When the valve operation learning unit 742 determines that there is a request to shift to the generator drive mode in which only the generator is driven by the internal combustion engine 10 (step 112: Yes), the in-vehicle device other than the generator 20 in the internal combustion engine 10 Since the opening correction value of the EGR valve 19 can be learned without driving the control, the process proceeds to step 113. On the other hand, when the valve operation learning unit 742 determines that there is no request for shifting to the generator drive mode (step S112: No), the internal combustion engine 10 is used to drive an in-vehicle device other than the generator 20, and EGR Since learning of the opening correction value of the valve 19 cannot be performed, the process waits until it is determined that there is a request to shift to the generator drive mode.

Then, the operating point setting unit 743 sets the operating point of the internal combustion engine 10 based on the frequency at which the operating point of the internal combustion engine 10 passes (for example, the learning operating point 310 shown in FIG. 4). ˜340), the engine speed and engine torque of the internal combustion engine 10 are controlled (step 113).

The valve operation learning unit 742 learns the correction value of the opening degree of the EGR valve 19 at each of the plurality of learning operation points 310 to 340 set by the operation point setting unit 743 (step 114).

After the learning of the opening correction value of the EGR valve 19 at a predetermined learning operation point (for example, the learning operation point 310) is completed, the valve operation learning unit 742 performs all other learning operations set in advance. It is determined whether or not learning of the opening correction value of the EGR valve 19 at the points (for example, the learning operation points 320 to 340) has been completed (step 115), and the EGR valve 19 is opened at all the learning operation points. When it is determined that the learning of the degree correction value has been completed (step 115: Yes), the process proceeds to step 116 and it is determined that the learning control is finished. Then, the internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operating point of the internal combustion engine 10 becomes an operating point at which the fuel efficiency is optimal (step 117). On the other hand, if the valve operation learning unit 742 determines that learning of the opening correction value of the EGR valve 19 at all learning operation points has not been completed (step 115: No), the valve operation learning unit 742 returns to step 112 and sets other preset values. Steps 112 to 115 are continued until it is determined that learning of the opening correction value of the EGR valve 19 at all the learning operation points (for example, the learning operation points 320 to 340) has been performed.

As described above, in the first embodiment,
(1) An internal combustion engine 10 having at least one valve (for example, a throttle valve 15 or an EGR valve 19), a motor 50 that drives the hybrid vehicle 100, and a generator 20 that is driven by the internal combustion engine 10 are provided. In the hybrid vehicle 100, a control device 70 for controlling the operation of the valve, in the motor drive mode in which the hybrid vehicle 100 is driven by the motor 50, the learning operation point (for example, the operation point of the internal combustion engine 10 is set in advance). The internal combustion engine control unit 741 that controls the internal combustion engine 10 so as to be the learning operation points 310 to 340), and the internal combustion engine control unit 741 controls the operation point of the internal combustion engine 10 to be the learning operation point. And a valve operation learning unit 742 that learns the operation of the valve in the state.

With this configuration, in the motor drive mode in which the internal combustion engine 10 drives only the generator 20 and the hybrid vehicle 100 is driven by the motor 50, the operating point can be freely changed within the operating range of the internal combustion engine 10. The valve operation can be learned even at an operating point where the internal combustion engine 10 passes in a transient state. Therefore, the valve operation learning unit 742 of the control device 70 can increase the valve operation learning opportunity when the vehicle is used, and can improve the control accuracy of the valve.

(2) Further, as described above, the operation point setting unit 743 that sets a plurality of learning operation points within the operation range of the internal combustion engine 10 is used.

With this configuration, the operation point setting unit 743 sets a plurality of learning operation points within the operation range of the internal combustion engine 10, so that the valve operation learning unit 742 has the internal combustion engine 10 as a plurality of learning operation points. The valve operation can be learned in such a controlled state. As a result, it is possible to appropriately learn the valve operation according to the operating state of the internal combustion engine 10 in which the hybrid vehicle 100 is traveling, and to improve the valve control accuracy.

(3) As described above, the internal combustion engine 10 is provided so as to be able to drive the generator 20 and a vehicle-mounted device (not shown) different from the generator 20, and the valve operation learning unit 742 After the engine 10 is switched to the generator drive mode in which only the generator 20 is driven, the operation of the valve is controlled in a state where the operation point of the internal combustion engine 10 is controlled to be the learning operation point by the internal combustion engine control unit 741. It was set as the structure which learns.

With this configuration, after the internal combustion engine 10 is switched to the generator drive mode for driving only the generator 20, the output of the internal combustion engine 10 does not affect the drive of the in-vehicle device (not shown). The engine control unit 741 can control the operating point of the internal combustion engine 10 to an arbitrary point within the operating range. Therefore, the valve operation learning unit 742 can learn the valve operation at an arbitrary learning operation point of the internal combustion engine 10 and can increase the valve operation learning opportunity.

(4) As described above, the operating point setting unit 743 sets the learning operating point based on the frequency at which the operating point of the internal combustion engine 10 passes when the internal combustion engine 10 drives the in-vehicle device (not shown). The configuration is set.

With this configuration, the valve operation learning unit 742 can appropriately learn the valve operation at the operation point where the valve is frequently used in the operation of the internal combustion engine 10. Therefore, the control accuracy of the valve can be effectively increased with minimal learning.

(5) As described above, the valve is the EGR valve 19 that adjusts the recirculation amount of the exhaust gas from the exhaust passage to the intake passage of the internal combustion engine 10, and the operating point setting unit 743 The learning operation point is set in the EGR region.

With this configuration, the operating point setting unit 743 can learn the opening correction value of the EGR valve 19 at the learning operating point set in the EGR region of the internal combustion engine 10. EGR control based on the learning result of the opening correction value can be performed with high accuracy. Therefore, as a result of accurate feedback control so that the actual EGR rate becomes the target EGR rate, the fuel consumption of the internal combustion engine 10 and the exhaust gas can be reduced. Here, the EGR rate means the ratio of the recirculated EGR gas to the total of the air newly sucked into the intake side and the recirculated EGR gas.

(6) As described above, the EGR valve 19 is an EGR valve that adjusts the recirculation amount of the exhaust gas to the exhaust passage downstream of the turbine 16 of the internal combustion engine 10 and the intake passage upstream of the compressor 12. Yes, the operating point setting unit 743 sets the learning operating point within the EGR region of the internal combustion engine 10.

With this configuration, since the EGR valve 19 is an EGR valve provided in the low pressure EGR system, the opening correction value of the EGR valve 19 in the low pressure EGR system in which the EGR region of the internal combustion engine 10 is wide is accurately learned. Can do. Therefore, also in the low pressure EGR system, it is possible to reduce the fuel consumption of the internal combustion engine 10 and reduce the exhaust gas.

(7) Further, as described above, the valve operation learning unit 742 has a valve control unit 744 that controls the EGR valve 19 based on the operation of the EGR valve 19 learned.

With this configuration, the valve control unit 744 can appropriately perform the valve opening control of the EGR valve 19 based on the opening correction value of the EGR valve 19 learned by the valve operation learning unit 742.

<Second Embodiment>
Next, a second embodiment according to the present invention will be described with reference to FIG.
In the second embodiment, the operating point setting unit 743 stores operating points that frequently pass during the transient operation of the internal combustion engine 10 in a storage device such as the RAM 73. Then, the valve operation learning unit 742 controls the internal combustion engine 10 so as to shift the operation point of the internal combustion engine 10 to the operation point read from the RAM 73 based on the operation point stored in the RAM 73 or the like, and then the EGR valve 19. The point of learning the opening correction value is different from the embodiment described above.

First, the operating point setting unit 743 sets a plurality of operating points that are set in advance based on the frequency at which the operating point of the internal combustion engine 10 passes in an operating state such as a steady state or a transient state of the internal combustion engine 10 such as the RAM 73. Store in advance in the storage device (step 120). For example, the operating point setting unit 743 stores, in the RAM 73, operating points that pass more than other operating points of the internal combustion engine 10 in an operating state such as a steady state or a transient state.

The valve operation learning unit 742 determines whether to start learning the opening correction value of the EGR valve 19 (step 121), and when it is determined that the learning start timing is reached (step 122: Yes), the step Proceed to 123. On the other hand, when it is determined that it is not the learning start timing (step 122: No), the valve operation learning unit 742 returns to step 120 and waits until it is determined as the learning start timing.

When the valve operation learning unit 742 determines that there is a request to shift to the generator drive mode in which only the generator is driven by the internal combustion engine 10 (step 123: Yes), the in-vehicle device other than the generator 20 in the internal combustion engine 10 Since it is possible to learn the opening correction value of the EGR valve 19 without driving, the process proceeds to step 124. On the other hand, when the valve operation learning unit 742 determines that there is no request for shifting to the generator drive mode (step S123: No), the internal combustion engine 10 is used to drive an in-vehicle device other than the generator 20, and EGR Since learning of the opening correction value of the valve 19 cannot be performed, the process waits until it is determined that there is a request to shift to the generator drive mode.

The operation point setting unit 743 reads the operation point stored in the RAM 73 or the like in step 120, and sets the read operation point as a learning operation point. Then, the internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operation point of the internal combustion engine 10 becomes the learning operation point read from the RAM 73 (step 124).

The valve operation learning unit 742 learns the opening correction value of the EGR valve 19 at each of the plurality of learning operation points set by the operation point setting unit 743 (step 125).

After learning of the opening correction value of the EGR valve 19 at a predetermined learning operation point, the valve operation learning unit 742 opens the opening of the EGR valve 19 at all other preset learning operation points. It is determined whether or not learning of the correction value has been completed (step 126), and when it is determined that learning of the opening correction value of the EGR valve 19 at all learning operation points has been completed (step 126: Yes), step 127 is performed. It is determined that the learning control is finished by proceeding to. Then, the internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operating point of the internal combustion engine 10 becomes an operating point at which the fuel efficiency is optimal (step 128). On the other hand, when the valve operation learning unit 742 determines that learning of the opening correction value of the EGR valve 19 at all learning operation points has not been completed (step 126: No), the valve operation learning unit 742 returns to step 123 and sets other preset values. Steps 123 to 126 are continued until it is determined that learning of the opening correction value of the EGR valve 19 at all the learning operation points is performed.

As described above, in the second embodiment, the operating point setting unit 743 has a plurality of operating points set according to the frequency with which the operating point of the internal combustion engine 10 passes (for example, the number of times that the operating point passes within a predetermined time is different). Are stored in the RAM 73 in advance, and the internal combustion engine controller 741 determines that the operating point of the internal combustion engine 10 is the operating point (learning operating point) stored in the RAM 73. The internal combustion engine 10 is controlled. Therefore, the valve operation learning unit 742 can learn the opening correction value of the EGR valve 19 based on the operation point (learning operation point) that has been frequently passed in the operation of the internal combustion engine 10 in the past. The 19 learnings can be appropriately performed based on the past results.

<Third Embodiment>
Next, a third embodiment according to the present invention will be described with reference to FIG.
In the third embodiment, the valve operation learning unit 742 of the CPU 74 learns the opening correction value of the EGR valve 19 when the difference between the target EGR rate and the actual EGR rate is equal to or greater than a predetermined threshold. This is a difference from the first embodiment and the second embodiment described above.

First, the operating point setting unit 743 sets a plurality of operating points that are set in advance based on the frequency at which the operating point of the internal combustion engine 10 passes in an operating state such as a steady state or a transient state of the internal combustion engine 10 such as the RAM 73. Pre-stored in the storage device (step 130). For example, the operating point setting unit 743 stores, in the RAM 73, operating points that pass more than other operating points of the internal combustion engine 10 in an operating state such as a steady state or a transient state.

The valve operation learning unit 742 determines whether or not to start learning the opening correction value of the EGR valve 19 (step 131). The valve operation learning unit 742 acquires from the hybrid vehicle 100 the target EGR rate at the operation point that is preset according to the frequency (for example, predetermined) that the operation point of the internal combustion engine 10 passes and stored in the RAM 73 or the like. The difference with the actual EGR rate in the current operation is compared (step 132). If it is determined that the difference is equal to or greater than a certain threshold value (step 133: Yes), it is determined that learning is necessary and the process proceeds to step S134. If it is determined that the difference is less than a certain threshold (step S133: No), the difference between the target EGR rate and the actual EGR rate is small, so that it is determined that there is no need for learning, and the process is terminated.

When the valve operation learning unit 742 determines that there is a request to shift to the generator drive mode in which only the generator is driven by the internal combustion engine 10 (step 134: Yes), the in-vehicle device other than the generator 20 in the internal combustion engine 10 Since it is possible to learn the opening correction value of the EGR valve 19 without driving the valve, the routine proceeds to step 135. On the other hand, when the valve operation learning unit 742 determines that there is no request for shifting to the generator drive mode (step S134: No), the internal combustion engine 10 is used to drive an in-vehicle device other than the generator 20, and EGR Since learning of the opening correction value of the valve 19 cannot be performed, the process waits until it is determined that there is a request to shift to the generator drive mode.

The operation point setting unit 743 reads the operation point stored in the RAM 73 or the like in step 130, and sets the read operation point as a learning operation point. Then, the internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operation point of the internal combustion engine 10 becomes the learning operation point read from the RAM 73 (step 135).

The valve operation learning unit 742 learns the opening correction value of the EGR valve 19 at each of a plurality of learning operation points (for example, the learning operation points 310 to 340) set by the operation point setting unit 743 (step 136).

After learning of the opening correction value of the EGR valve 19 at a predetermined learning operation point, the valve operation learning unit 742 opens the opening of the EGR valve 19 at all other preset learning operation points. It is determined whether or not learning of the correction value has been completed (step 137), and if it is determined that learning of the opening correction value of the EGR valve 19 at all learning operation points has been completed (step 137: Yes), step 138 is completed. It is determined that the learning control is finished by proceeding to. Then, the internal combustion engine control unit 741 controls the engine speed and the engine torque of the internal combustion engine 10 so that the operating point of the internal combustion engine 10 becomes an operating point at which the fuel efficiency is optimal (step 139). On the other hand, when the valve operation learning unit 742 determines that learning of the opening correction value of the EGR valve 19 at all learning operation points has not been completed (step 137: No), the valve operation learning unit 742 returns to step 134 and sets other preset values. Steps 134 to 137 are continued until it is determined that learning of the opening correction value of the EGR valve 19 at all the learning operation points is performed.

(8) As described above, the valve operation learning unit 742 of the CPU 74 sets the target EGR rate set in advance according to the operation state of the internal combustion engine 10 and the actual actual EGR rate in the same operation state of the internal combustion engine 10. When it is determined that the difference is greater than or equal to the threshold value, it is determined that learning of the operation of the EGR valve 19 is necessary.

With this configuration, the valve operation learning unit 742 does not need to learn the opening correction value of the EGR valve 19 when the difference between the target EGR rate and the actual EGR rate does not deviate more than a predetermined threshold. By determining, it is possible to prevent the internal combustion engine control unit 741 from performing unnecessary control of the operating point of the internal combustion engine 10 as the learning operating point, and to reduce the fuel consumption of the internal combustion engine 10. Further, since the valve operation learning unit 742 compares the target EGR rate and the actual EGR rate in real time at a predetermined cycle and determines the necessity of learning of the EGR valve 19, it is necessary to learn the EGR valve 19. Can be done efficiently with timing.

In the above-described embodiment, the control device 70 according to the present invention is applied to a series hybrid vehicle in which the internal combustion engine 10 drives the generator 20 and another vehicle-mounted device different from the generator 20 and does not directly drive the hybrid vehicle 100. However, the control device 70 may be applied to control other types of hybrid vehicles. For example, the control device 70 according to the present invention may be applied to a control device for a parallel hybrid vehicle in which the vehicle is driven by either the motor 50 or the internal combustion engine 10. Specifically, the internal combustion engine 10 is provided so that the generator 20 and the hybrid vehicle 100 can be driven, and the valve operation learning unit 742 is in a generator drive mode in which only the generator 20 is driven by the internal combustion engine 10. After switching, the operation of the EGR valve 19 may be learned in a state in which the operation point of the internal combustion engine 10 is controlled by the internal combustion engine control unit 741 to be the learning operation point. With this configuration, in the generator drive mode in which only the generator 20 is driven by the internal combustion engine 10 and is not involved in the direct drive of the hybrid vehicle 100, the operating point of the internal combustion engine 10 is determined as the operating state (steady state) of the parallel hybrid vehicle. And an operation point for learning that frequently passes in a transient state). Therefore, since the valve operation learning unit 742 can learn the EGR valve 19 not only in the steady state but also in the transient state, it is possible to increase the valve learning opportunities. As a result, the control device 70 can appropriately learn the operation of the EGR valve 19 and can improve the accuracy of EGR control by performing feedback control.

In the above-described embodiment, the case where the learning control of the EGR valve 19 is performed has been described as an example. However, the embodiment is not limited to the EGR valve 19 as long as it is a valve provided in the internal combustion engine 10. A throttle valve 15 or the like may be used. Further, a valve other than that provided in the internal combustion engine 10 may be used.

Further, in the above-described generator driving mode, if the hybrid vehicle 100 is driven by the motor 50, not only the state in which the internal combustion engine 10 drives the generator 20, but also the generator 20 is driven. Including a low load state. Therefore, the internal combustion engine 10 can arbitrarily change the operating point in a steady state or a transient operating state, and in this state, the valve operation learning unit 742 causes the internal combustion engine 10 to be an arbitrary learning operating point. In a controlled state, valve learning can be performed appropriately.

In the above, an example of the embodiment of the present invention has been described. However, the present invention may combine all of the above-described embodiments, and may arbitrarily combine any two or more embodiments.

Further, the present invention is not limited to the one having all the configurations of the above-described embodiment, and a part of the configuration of the above-described embodiment is replaced with the configuration of another embodiment. In addition, the configuration of the above-described embodiment may be replaced with the configuration of another embodiment.

Further, a part of the configuration of the above-described embodiment may be added to, deleted from, or replaced with the configuration of another embodiment.

10: Hybrid vehicle, 11: Air flow sensor, 12: Compressor, 13: Intercooler, 14: Cylinder, 141: Spark plug, 142: Fuel injection device, 143: Piston, 144: Intake valve, 145: Exhaust valve, 146: Crankshaft, 147: Signal rotor, 148: Crank angle sensor, 149: Water temperature sensor, 15: Throttle valve, 151: Throttle sensor, 16: Turbine, 17: Three-way catalyst, 171: A / F sensor, 18: EGR flow Road, 181: EGR cooler, 19: EGR valve, 20: generator, 30: power converter, 40: battery, 50: motor, 60: reduction gear, 65: axle, 66: tire, 70: control device, 71 : Input circuit, 72: input / output port, 73: RAM, 74: CPU, 741: internal combustion engine system , 742: valve operation learning unit, 743: operation point setting unit, 744: valve control unit, 75: ROM, 76: valve drive circuit, 77: throttle valve drive circuit, 78: fuel injection device drive circuit, 79: ignition Output circuit, 100: hybrid vehicle

Claims

In a vehicle comprising an internal combustion engine having at least one valve, a motor for driving the vehicle, and a generator driven by the internal combustion engine, a control device for controlling the operation of the valve,
In a motor drive mode in which the vehicle is driven by the motor,
An internal combustion engine controller that controls the internal combustion engine so that the operating point of the internal combustion engine is a preset operating point for learning;
And a valve operation learning unit that learns the operation of the valve in a state in which the operation point of the internal combustion engine is controlled to be the learning operation point by the internal combustion engine control unit.
The control device according to claim 1, further comprising an operating point setting unit that sets a plurality of operating points for learning within an operating range of the internal combustion engine.
The internal combustion engine is provided so as to be able to drive the generator and a vehicle-mounted device different from the generator.
After the valve operation learning unit is switched to the generator drive mode in which only the generator is driven by the internal combustion engine, the operation point of the internal combustion engine becomes the learning operation point by the internal combustion engine control unit. The control device according to claim 2, wherein learning of the operation of the valve is performed in a controlled state.
The internal combustion engine is provided to be able to drive the generator and the vehicle,
After the valve operation learning unit is switched to the generator drive mode in which only the generator is driven by the internal combustion engine, the operation point of the internal combustion engine becomes the learning operation point by the internal combustion engine control unit. The control device according to claim 2, wherein learning of the operation of the valve is performed in a controlled state.
The control device according to claim 3, wherein the operating point setting unit sets the learning operating point based on a frequency with which the operating point of the internal combustion engine passes when the internal combustion engine drives the on-vehicle device.
The control device according to claim 4, wherein the operating point setting unit sets the learning operating point based on a frequency at which the operating point of the internal combustion engine passes when the internal combustion engine drives the vehicle.
The valve is an EGR valve that adjusts a recirculation amount of exhaust gas from an exhaust passage of the internal combustion engine to an intake passage,
The control device according to claim 5, wherein the operating point setting unit sets the learning operating point within an EGR region of the internal combustion engine.
The valve is an EGR valve that adjusts an exhaust gas recirculation amount to an exhaust passage downstream of the turbine of the internal combustion engine and an intake passage upstream of the compressor,
The control device according to claim 7, wherein the operating point setting unit sets the learning operating point within an EGR region of the internal combustion engine.
The valve operation learning unit determines that a difference between a target EGR rate set in advance according to an operation state of the internal combustion engine and an actual actual EGR rate in the same operation state of the internal combustion engine is equal to or greater than a threshold value. The control device according to claim 8, wherein if it is determined that learning of the operation of the EGR valve is necessary.
The control device according to claim 1, further comprising a valve control unit that controls the valve based on the operation of the valve learned by the valve operation learning unit.
A control method for controlling the operation of the valve in a vehicle comprising an internal combustion engine having at least one valve, a motor for driving the vehicle, and a generator driven by the internal combustion engine,
Determining whether or not it is a motor drive mode for driving the vehicle by the motor;
Controlling the internal combustion engine so that the operating point of the internal combustion engine becomes a preset operating point for learning when it is determined that the motor driving mode is set;
And a step of learning the valve operation in a state in which the operation point of the internal combustion engine is controlled to be the learning operation point by the step of controlling the internal combustion engine.