CN106050440B

CN106050440B - Control device and control method for internal combustion engine

Info

Publication number: CN106050440B
Application number: CN201610222078.7A
Authority: CN
Inventors: 野崎智裕; 山口正晃
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2015-04-13
Filing date: 2016-04-11
Publication date: 2018-10-12
Anticipated expiration: 2036-04-11
Also published as: JP6222210B2; JP2016200135A; CN106050440A

Abstract

The present invention provides the control devices and control method for internal combustion engine.The control device includes electronic control unit.The based on engine rotary speed of electronic control unit and stressor overlap the period to calculate the target phase angles of intake valve, the target phase angles of air bleeding valve and target.Electronic control unit is configured to be set as the target phase angles of air bleeding valve and intake valve in the case where the valve timing of intake valve and air bleeding valve shifts to an earlier date, when negative overlapping generation by the target phase angles of the target phase angles of intake valve and air bleeding valve.

Description

Control device and control method for internal combustion engine

Technical field

The present invention relates to the control devices and control method for internal combustion engine.

Background technology

Japanese Patent Application Publication No. 2007-32515 (JP 2007-32515 A) discloses the control dress for internal combustion engine It sets, which includes air inlet side vario valve timing (VVT) mechanism and exhaust side vvt mechanism.

In such internal combustion engine, change admission cam shaft and row using air inlet side vvt mechanism and exhaust side vvt mechanism Rotatable phase of the gas camshaft relative to bent axle.Therefore, the valve timing of intake valve and air bleeding valve is changed.In addition, according to internal combustion The mode of operation of machine controls the overlapping period of intake valve and air bleeding valve.Thus, it is possible to obtain the improvement of the output of internal combustion engine, combustion Expect the reduction of improvement and the exhaust gas discharge of efficiency.

In the control device for the internal combustion engine of JP 2007-32515 A, when operation is steady from accelerating operation to be transferred to When determining state, the valve timing of air bleeding valve is advanced by predetermined amount and the valve timing of intake valve is advanced by than from the pre- of following state Quantitative big amount, in this condition, the overlapping period of air bleeding valve and intake valve is zero.According to this, air bleeding valve is in in-cylinder pressure To be opened in the state of height, and it therefore can improve internal exhaust gas recirculation (EGR) amount.

Invention content

In the internal combustion engine including air inlet side variable valve timing mechanism and exhaust side variable valve timing mechanism, in original state Under (before starting the operation), the valve timing of air bleeding valve is set as most anticipated future position, and the valve timing of intake valve is set For most lag position.Therefore, under initial position, the period is overlapped with negative minimum, that is, the negative overlapping period is made to maximize.It is negative It is overlapping to indicate that period when wherein both intake valve and air bleeding valve are under closed state is present in being closed into from air bleeding valve In the period of the unlatching of intake valve.

In the control device for above-mentioned internal combustion engine.According to the base figure (base map) of the mode of operation according to internal combustion engine Target phase angles and target to calculate intake valve and air bleeding valve overlap the period.In addition, air inlet side variable valve timing mechanism and Exhaust side variable valve timing mechanism is controlled such that the deviation between calculated target phase angles and actual phase angle is eliminated.

The target phase angles of air bleeding valve are the target hysteretic amounts from the initial position (most anticipated future position) of air bleeding valve.Intake valve Target phase angles be target lead from the initial position (most lag position) of intake valve.(hereinafter also according to base figure It is referred to as " base map values ") calculated each desired value is used as optimized fuel efficient point corresponding with mode of operation.

Fig. 8 shows based on the target phase angles as optimized fuel efficient point the case where come control valve timing.For example, working as When the valve timing of intake valve and air bleeding valve shifts to an earlier date, as shown in figure 8, there are following situations：Due to in the behaviour for reducing overlapping side Make the subsequent delay of the air bleeding valve in direction, therefore the practical overlapping period is more than temporarily that target overlaps the period.

In order to solve this problem, when the valve timing of intake valve and air bleeding valve shifts to an earlier date, increasing it is conceivable that will have The target phase angles of the intake valve in the operation direction of overlapping side are set as the value less than base map values.As a result, it is conceivable that preventing The practical overlapping period is more than that target overlaps the period.However, when target phase angles are set to be less than base map values, the valve of intake valve Timing can spend the time to restrain to optimized fuel efficient point.

When the case where identical valve timing lag for controlling and being applied to intake valve and air bleeding valve, may exist valve timing The case where spending the time to be restrained to optimized fuel efficient point.

This disclosure provides the control device and control method for internal combustion engine, the control device and control method Can be more than that target promotes valve timing to be restrained to base map values while overlapping the period preventing the practical overlapping period.

The illustrative aspect of the present invention provides a kind of control device for internal combustion engine, and internal combustion engine includes intake valve, row Air valve, air inlet side variable valve timing mechanism and exhaust side variable valve timing mechanism.Air inlet side variable valve timing mechanism is configured At the first valve timing of change.First valve timing is the valve timing of intake valve.Exhaust side variable valve timing mechanism is configured to change Second valve timing.Second valve timing is the valve timing of air bleeding valve.Control device includes electronic control unit, the electronic control unit It is configured to：Rotary speed and stressor based on internal combustion engine calculate the first object phase angle of intake valve, air bleeding valve Second target phase angles and target overlap the period；When the first valve timing and the second valve timing shift to an earlier date, when being overlapped based on target Section and the second actual phase angle calculate third target phase angles, and the second actual phase angle is the actual phase angle of air bleeding valve, and And third target phase angles are the target phase angles of intake valve；When the first valve timing and the second valve timing shift to an earlier date, by the second mesh Mark phase angle is set as the target phase angles of air bleeding valve and third target phase angles is set as to the target phase angles of intake valve； And when the first valve timing and the second valve timing be in advance so that it is negative it is overlapping occur when, the second target phase angles are set as being vented The target phase angles of valve and the target phase angles that first object phase angle is set as to intake valve, it is following state to bear overlapping： It so that in the period from the unlatching for being closed into the intake valve of the air bleeding valve both intake valve and air bleeding valve are in Closed state.

Second target phase angles of air bleeding valve are the target hysteretic amounts from the initial position (most anticipated future position) of air bleeding valve.Into The first object phase angle of air valve is the target lead from the initial position (most lag position) of intake valve.The reality of air bleeding valve Phase angle is the actual phase angle of air bleeding valve (from the hysteresis of initial position).The overlapping period is wherein intake valve and air bleeding valve two Angular region (period) of the person all in open state.Target overlaps the desired value that the period is the overlapping period.Have when the overlapping period When positive value, there is both period that wherein intake valve and air bleeding valve are in open state.On the other hand, have when the overlapping period When negative value, there is both period that wherein intake valve and air bleeding valve are in closed state.

It, can be according to target phase angles (the base figure for calculating intake valve according to the base figure of mode of operation using the configuration Value), and calculate the target phase angles no more than base map values of intake valve.In the feelings that the valve timing of intake valve and air bleeding valve shifts to an earlier date Under condition, at the overlapping time, by the way that calculated value to be set as to the target phase angles of intake valve, it can prevent practical overlapping Period is more than that target overlaps the period.In the case where the valve timing of intake valve and air bleeding valve shifts to an earlier date, is bearing at the overlapping time, leading to The target phase angles that calculated value is set as to intake valve are crossed, convergence of the valve timing of intake valve to base map values can be promoted. Therefore, in the case where the valve timing of intake valve and air bleeding valve shifts to an earlier date, the practical overlapping period can prevented overlapping more than target The valve timing of intake valve is promoted to be restrained to base map values while period.

In control device, electronic control unit may be configured to the feelings shifted to an earlier date in the first valve timing and the second valve timing It is to determine the first valve timing and the second valve timing based on first object phase angle and the second actual phase angle of air bleeding valve under condition It is no to be set so that negative overlapping generation.

Using the configuration, can easily determine whether to establish negative overlapping.

In control device, electronic control unit may be configured to when the first valve timing and the second valve timing ratchet time-base Period and the first actual phase angle are overlapped to calculate the 4th target phase angles in target, and the 4th target phase angles are the mesh of air bleeding valve Phase angle is marked, and the first actual phase angle is the actual phase angle of intake valve.Electronic control unit may be configured to when the The 4th target phase angles are set as the target phase angles of air bleeding valve when one valve timing and the second valve timing lag and by first Target phase angles are set as the target phase angles of intake valve.Electronic control unit may be configured to when the first valve timing and second Valve timing lag for so that it is negative overlapping occur when the second target phase angles are set as the target phase angles of air bleeding valve and by the One target phase angles are set as the target phase angles of intake valve.The actual phase angle of intake valve is the initial position from intake valve The practical lead at (phase angle).

It, can be when preventing practical overlapping in the case of the valve timing of intake valve and air bleeding valve lag using the configuration Section is more than that the valve timing of air bleeding valve is promoted to be restrained to base map values while target overlaps the period.

In control device, electronic control unit may be configured to when the first valve timing and the second valve timing ratchet time-base Determine whether negative overlap occurs in the first actual phase angle of the second target phase angles and intake valve.

In control device, electronic control unit may be configured to the base when the first valve timing and the second valve timing shift to an earlier date Period, the second actual phase angle of air bleeding valve and valve variation angle are overlapped in target to calculate the 5th target phase of intake valve Angle.Valve variation angle is the angular range of the fluctuation of intake valve and air bleeding valve, and the fluctuation is due to intake valve and air bleeding valve Opened/closed operation and the cam reaction force that periodically increases or reduces and generate, and valve variation angle is for example Preset value.

Using the configuration, in the case where the valve timing of intake valve and air bleeding valve shifts to an earlier date, the practical overlapping period can be prevented Overlap the period more than target, in addition when intake valve and air bleeding valve are fluctuated due to cam reaction force it is also such.

In control device, electronic control unit may be configured to the base when the first valve timing and the second valve timing shift to an earlier date Change angle in first object phase angle, the second actual phase angle of air bleeding valve and valve to determine whether negative overlap occurs.

Using the configuration, can determine whether to establish in the case where considering that valve changes angle negative overlapping.

In control device, electronic control unit may be configured to when the first valve timing and the second valve timing ratchet time-base Period, the first actual phase angle of intake valve and valve variation angle are overlapped in target to calculate the 6th target phase of air bleeding valve Angle.Electronic control unit may be configured to set the 6th target phase angles when the first valve timing and the second valve timing lag For air bleeding valve target phase angles and first object phase angle is set as to the target phase angles of intake valve.Electronic control unit It may be configured to lag as so that setting first object phase angle when bearing overlapping generation when the first valve timing and the second valve timing It is set to the target phase angles of intake valve and the second target phase angles is set as to the target phase angles of air bleeding valve.

Using the configuration, in the case of the valve timing of intake valve and air bleeding valve lag, the practical overlapping period can be prevented Overlap the period more than target, in addition when intake valve and air bleeding valve are fluctuated due to cam reaction force it is also such.

In control device, electronic control unit may be configured to when the first valve timing and the second valve timing ratchet time-base Change angle in the second target phase angles, the first actual phase angle of intake valve and valve to determine whether negative overlap occurs.

The present invention another exemplary in terms of provide a kind of control device for internal combustion engine, internal combustion engine include intake valve, Air bleeding valve, air inlet side variable valve timing mechanism and exhaust side variable valve timing mechanism.Air inlet side variable valve timing mechanism by with It is set to and changes the first valve timing.First valve timing is the valve timing of intake valve.Exhaust side variable valve timing mechanism is configured to change Become the second valve timing.Second valve timing is the valve timing of air bleeding valve.Control device includes electronic control unit, the electronic control list Member is configured to：Rotary speed and stressor based on internal combustion engine calculate first object phase angle, the air bleeding valve of intake valve The second target phase angles and target overlap the period；It is overlapping based on target when the first valve timing and the second valve timing lag Period and the first actual phase angle calculate the 4th target phase angles, and the 4th target phase angles are the target phase angles of air bleeding valve, First actual phase angle is the actual phase angle of intake valve；When the first valve timing and the second valve timing lag, by the 4th target Phase angle is set as the target phase angles of air bleeding valve and first object phase angle is set as to the target phase angles of intake valve；With And when the first valve timing and the second valve timing lag for so that it is negative overlapping occur when, the second target phase angles are set as air bleeding valve Target phase angles and first object phase angle is set as to the target phase angles of intake valve.Negative overlap is following state：Its So that in the period from the unlatching for being closed into the intake valve of the air bleeding valve both intake valve and air bleeding valve are in and close Conjunction state.

A kind of control method for internal combustion engine is provided in terms of the another exemplary of the present invention, internal combustion engine includes air inlet Valve, air bleeding valve, air inlet side variable valve timing mechanism and exhaust side variable valve timing mechanism.Air inlet side variable valve timing mechanism quilt It is configured to change the first valve timing, the first valve timing is the valve timing of intake valve.Exhaust side variable valve timing mechanism is configured to Change the second valve timing, the second valve timing is the valve timing of air bleeding valve.Control method includes：Rotary speed based on internal combustion engine and Stressor overlaps the period to calculate the first object phase angle of intake valve, the second target phase angles of air bleeding valve and target； When the first valve timing and the second valve timing shift to an earlier date, period and the second actual phase angle are overlapped based on target to calculate third target Phase angle, the second actual phase angle is the actual phase angle of air bleeding valve, and third target phase angles are the target phases of intake valve Parallactic angle；When the first valve timing and the second valve timing shift to an earlier date, the second target phase angles are set as to the target phase angles of air bleeding valve And third target phase angles are set as to the target phase angles of intake valve；And when the first valve timing and the second valve timing shift to an earlier date When to make negative overlapping occur, the second target phase angles are set as the target phase angles of air bleeding valve and by first object phase Angle is set as the target phase angles of intake valve.Negative overlap is following state：It makes described from being closed into for the air bleeding valve In the period of the unlatching of intake valve both intake valve and air bleeding valve are in closed state.

According to above configured, can prevent the practical overlapping period be more than promote while target overlaps the period valve timing to Base map values restrain.

Description of the drawings

The feature, advantage of exemplary embodiments of the present invention is described below in reference to attached drawing and technology is anticipated with industry Justice, in the accompanying drawings, identical reference numeral indicate identical element, and wherein：

Fig. 1 is to show that the exemplary of engine controlled by electronic control unit (ECU) according to first embodiment is shown Meaning property configuration diagram；

Fig. 2 is the oil inlet side control valve (OCV) for air inlet side vvt mechanism and control air inlet side VVT in definition graph 1 Figure；

Fig. 3 is the block diagram of the configuration for the ECU for showing Fig. 1；

Fig. 4 is for illustrating that the target phase angles of the valve timing in first embodiment set the flow chart of control；

Fig. 5 is shown in the case that the valve timing of intake valve in the first embodiment and air bleeding valve shifts to an earlier date when overlapping Between opened/closed timing exemplary figure；

Fig. 6 is shown in the case that the valve timing of intake valve in the first embodiment and air bleeding valve shifts to an earlier date negative overlapping The exemplary figure of opened/closed timing at time；

Fig. 7 is for illustrating that the target phase angles of the valve timing in second embodiment set the flow chart of control；And

Fig. 8 is to show the opened/closed timing in the case where the valve timing of the relevant technologies intake valve and air bleeding valve shifts to an earlier date Exemplary figure.

Specific implementation mode

Hereinafter, embodiment will be described based on attached drawing.By controlling the engine installed on vehicle (internal combustion engine) 1 ECU 400 realizes following embodiments.

First, first embodiment will be described.As shown in Figure 1, engine 1 is such as port injection type four-cylinder gasoline hair Motivation, and piston 1c is arranged in cylinder block 1a.Piston 1c is coupled to bent axle 15 via connecting rod 16.Fig. 1 is illustrated only The configuration of one cylinder of engine 1.

Cylinder head 1b is mounted to the upper end of cylinder block 1a and combustion chamber 1d be formed on cylinder head 1b and piston 1c it Between.Spark plug 3 is arranged in the combustion chamber 1d of engine 1.The ignition timing of spark plug 3 is adjusted by igniter 4.

Food tray 18 is arranged on the lower part of the cylinder block 1a of engine 1.Lubricant is stored in food tray 18 in engine 1 It is pumped via oil filter 20 (referring to Fig. 2) by oil pump 19 during operation, and for lubricating and cooling down each in engine 1 Part.In addition, lubricant is also used as the air inlet side vvt mechanism 100in for then describing and exhaust side vvt mechanism 100ex Hydraulic oil.The mechanical pump that oil pump 19 is the rotation of the bent axle 15 for example by engine 1 to drive.

Signal rotor 17 is mounted to bent axle 15, and crank position sensor 37 is arranged on the attached of signal rotor 17 Closely.Crank position sensor 37 is arranged to the rotation position of detection bent axle 15.In addition, the cooling of the temperature of detection coolant Agent temperature sensor 31 is arranged in the cylinder block 1a of engine 1.

Inlet channel 11 and exhaust passage 12 are connected to the combustion chamber 1d of engine 1.In inlet channel 11, setting is free Air cleaner 7, measure air inflow air flow meter 32, measure intake air temperature intake air temperature sensor 33, for adjust into Electronically controlled throttle valve 5 of tolerance etc..Throttle valve 5 is driven by solar term motor 6.It is examined by throttle valve turn on sensor 36 Survey the unlatching of throttle valve 5.In exhaust passage 12, it is provided with the O of the oxygen concentration in detection exhaust₂Sensor 34 and catalysis turn Parallel operation (ternary catalyzing unit) 8.

Intake valve 13 is arranged between inlet channel 11 and combustion chamber 1d, and air bleeding valve 14 is arranged on exhaust passage Between 12 and combustion chamber 1d.Using the rotation of each camshaft in admission cam shaft 21 and exhaust cam shaft 22 come realize into The opened/closed of air valve 13 and air bleeding valve 14 drives, wherein the rotation of bent axle 15 is transferred to admission cam via timing belt etc. Axis 21 and exhaust cam shaft 22.The air inlet side vvt mechanism 100in for changing the valve timing of intake valve 13 is arranged on admission cam shaft 21 end, and the exhaust side vvt mechanism 100ex for changing the valve timing of air bleeding valve 14 is arranged on the end of exhaust cam shaft 22 Portion.Details in each of will then be described air inlet side vvt mechanism 100in and exhaust side vvt mechanism 100ex.

Air inlet side cam-position sensor 38 is arranged near admission cam shaft 21.Exhaust side cam position sensor 39 are arranged near exhaust cam shaft 22.Air inlet side cam-position sensor 38 is arranged to detection admission cam shaft 21 Rotation position.Exhaust side cam position sensor 39 is arranged to the rotation position of detection exhaust cam shaft 22.

Injector (fuel injection valve) 2 for fuel injection is arranged in inlet channel 11.It is sprayed from injector 2 Fuel mixes to become air-fuel mixture with air inlet, and air-fuel mixture is introduced into the 1d of combustion chamber.Drawn The air-fuel mixture entered in the 1d of combustion chamber is lighted a fire by spark plug 3, and is burned and is erupted.Piston 1c by means of The burning and eruption of air-fuel mixture piston 1c and move back and forth, and bent axle 15 rotates whereby.

Next, air inlet side vvt mechanism 100in will be described and controls the oil inlet side control valve of air inlet side vvt mechanism 100in (OCV)200in.Note that exhaust side vvt mechanism 100ex and oil extraction side control valve 200ex be configured to substantially with air inlet side Vvt mechanism 100in is similar with oil inlet side control valve 200in, therefore is controlled omitting to exhaust side vvt mechanism 100ex and oil extraction side The description of valve 200ex processed.

As shown in Fig. 2, air inlet side vvt mechanism 100in includes the shell of blade rotor 101 and accommodating blade rotor 101 102.Blade rotor 101 is coupled to admission cam shaft 21 (referring to Fig. 1).Timing pulley 102a is arranged in shell 102, and And timing pulley 102a is coupled to bent axle 15 via the timing belt having been not shown (referring to Fig. 1).In shell 102, it is formed with By the blade 101a of blade rotor 101 advance hydraulic chambers 111 divided and lag hydraulic pressure chamber 112.

In air inlet side vvt mechanism 100in, according in the hydraulic pressure and lag hydraulic pressure chamber 112 in advance hydraulic chamber 111 Hydraulic pressure, blade rotor 101 relative to shell 102 rotate.Also that is, the hydraulic pressure in advance hydraulic chamber 111 is set When being set to higher than hydraulic pressure in lag hydraulic pressure chamber 112, the rotation of the rotatable phase of admission cam shaft 21 relative to bent axle 15 Phase (shifts to an earlier date) in advance.On the contrary, when the hydraulic pressure in lag hydraulic pressure chamber 112 is set to higher than in advance hydraulic chamber 111 Hydraulic pressure when, the rotatable phase of admission cam shaft 21 lags (lag) relative to the rotatable phase of bent axle 15.Therefore, pass through Adjust the valve timing that admission cam shaft 21 changes intake valve 13 relative to the rotatable phase of bent axle 15.

Oil inlet side control to being supplied to the pressure of the hydraulic oil of advance hydraulic chamber 111 and lag hydraulic pressure chamber 112 to be controlled Valve OCV 200in processed are connected to air inlet side vvt mechanism 100in.

Lubricant (the liquid pumped from food tray 18 by oil pump 19 is supplied to oil inlet side control valve 200in via oil supply gallery 131 Pressure oil).Oil inlet side control valve 200in is connected to advance hydraulic chamber 111 via channel 121 in advance, and also via lag channel 122 are connected to lag hydraulic pressure chamber 112.In addition, two oil drain passages 132 and 133 are connected to oil inlet side control valve 200in.Row Oily side control valve 200in is the flow control valve of electromagnetic drive, and oil inlet side control valve 200in is controlled by ECU 400 (referring to Fig. 3) System.

Oil inlet side control valve 200in include be arranged in shell 201 with can move back and forth spool 202, by spool 202 are biased to the compression helical spring 203 of side and for being moved to spool 202 relative to the inclined of compression helical spring 203 The electromagnetic solenoid 204 of the other side of pressure.

In the control valve 200in of oil inlet side, changed to channel 121 in advance and lag hydraulic pressure using the movement of spool 202 Supply/discharge rate of the hydraulic oil of room 112, it is possible thereby to adjust each of advance hydraulic chamber 111 and lag hydraulic pressure chamber 112 In hydraulic pressure.

Next, by the ECU 400 of description control engine 1.

As shown in figure 3, ECU 400 includes central processing unit (CPU) 401, read-only memory (ROM) 402, arbitrary access Memory (RAM) 403, backup RAM 404, input interface 405, output interface 406 and these elements are linked together Bus 407.In ECU 400, CPU 401 executes the program being stored in ROM 402, and thus executes each control.

CPU 401 executes algorithm process based on the various control programs and mapping that are stored in ROM 402.In ROM In 402, it is stored in various control programs and is performed the various control programs being queried and mapping.RAM 403 is temporarily to store Pass through the memory of the testing result of the operating result and various sensors of CPU 401.Backup RAM 404 is closed in igniting When the data to be saved nonvolatile memory.

Coolant temperature sensor 31, air flow meter 32, intake air temperature sensor 33, O₂Sensor 34, detection accelerate Accelerator pressing quantity sensor 35, throttle valve turn on sensor 36, crank position sensor 37, the air inlet side cam of device pressing quantity The vehicle speed sensor 30 of position sensor 38, exhaust side cam position sensor 39 and detection car speed is connected to Input interface 405.

Injector 2, igniter 4, throttle motor 6, oil inlet side control valve 200in and oil extraction side control valve 200ex It is connected to output interface 406.

ECU 400 executes the various controls operation of engine 1 based on the output signal of various sensors, engine 1 Various control operations include the drive control (throttle valve opens control) of throttle motor 6, the fuel injection control of injector 2 And the ignition timing control of spark plug 3.

ECU 400 controls air inlet side vvt mechanism 100in and exhaust side vvt mechanism according to the mode of operation of engine 1 100ex.Specifically, ECU 400 sets mesh in each of intake valve 13 and air bleeding valve 14 based on the mode of operation of engine 1 Phase angle is marked, and controls oil inlet side control valve 200in and oil extraction side control valve 200ex makes target phase angles and actual phase Deviation between angle (true phase angle) is eliminated.

In engine 1, (before starting the operation) when engine 1 is in original state, just by the valve of air bleeding valve 14 When be set as position most in advance, and the valve timing of intake valve 13 being set as the position most lagged.Therefore, in original state Under, the period is overlapped with minimum negative value, that is, the negative overlapping period is made to maximize.Note that negative overlapping expression wherein intake valve and row Both period that air valve is brought to closed state was present in from the period of the unlatching for being closed into intake valve of air bleeding valve.

Note that the target phase angles of air bleeding valve 14 are the target hysteretics from the initial position (most anticipated future position) of air bleeding valve 14 Amount, and the target phase angles of intake valve 13 are the target leads from the initial position (most lag position) of intake valve 13.

Next, with reference to Fig. 4, description is set into control by the target phase angles to valve timing that ECU 400 is executed.Note Following below scheme is repeatedly carried out with predetermined time interval by ECU 400 in meaning.

First, in the step ST1 of Fig. 4, wide range of information projects is obtained.In the acquisition to wide range of information projects, for example, Air inflow is obtained from air flow meter 32, and the rotation of engine 1 is calculated based on the testing result of crank position sensor 37 Rotary speed (revolution number per unit time).In addition, being based on crank position sensor 37 and air inlet side cam-position sensor 38 Testing result calculate actual phase angle (example at the first actual phase angle) InFPA of intake valve 13, and be based on crank The testing result of position sensor 37 and exhaust side cam position sensor 39 calculates the actual phase angle (second of air bleeding valve 14 The example at actual phase angle) ExFPA.

Next, in step ST2, according to the mesh for calculating intake valve 13 according to the base figure of the mode of operation of engine 1 Mark phase angle (example at first object phase angle), the target phase angles of air bleeding valve 14 (examples of the second target phase angles) and Target overlaps the period.Specifically, according to wherein by the rotary speed of engine 1 and stressor the first base figure as parameter come Calculate target phase angles (base map values) InTPA of intake valve 13, and according to wherein by the rotary speed of engine 1 and load because Second base figure of the son as parameter overlaps period TOPA to calculate target.Then, air bleeding valve is calculated according to following formula (1) 14 target phase angles (base map values) ExTPA.Also that is, the base map values ExTPA of air bleeding valve 14 is the base by using intake valve 13 Map values InTPA and target overlap period TOPA and calculated calculated value.

ExTPA=TOPA- (InTPA+IOPA) ... (1)

In expression formula (1), IOPA is the overlapping period (angular range) in the initial state, and has negative value.This Outside, in the initial state overlapping interval I OPA and the first base figure and the second base figure is stored in such as ROM 402.Load The factor is the ratio between the full admission amount of the air inflow and engine 1 under current operation status, and stressor is to be based on example Being calculated such as the air inflow of engine 1 and rotary speed.

Calculated each desired value (the base map values InTPA of intake valve 13, the base map values of air bleeding valve 14 in step ST2 ExTPA and target overlap period TOPA) it is used as the value of optimized fuel efficient point corresponding with mode of operation.

Next, in step ST3, determine whether air inlet side vvt mechanism 100in is transferred to side in advance.Note that determine into Whether gas side vvt mechanism 100in, which is transferred to side in advance, is executed based on the target phase angles of intake valve 13 and actual phase angle 's.Also that is, by step ST1 the actual phase angle InFPA of calculated intake valve 13 in step ST2 it is calculated into The target phase angles InTPA of air valve 13 is compared, and is more than the feelings of actual phase angle InFPA in target phase angles InTPA Under condition, determine that air inlet side vvt mechanism 100in is transferred to side in advance.Then, it is transferred to side in advance in air inlet side vvt mechanism 100in In the case of, flow is moved to step ST4.On the other hand, side in advance is not transferred in air inlet side vvt mechanism 100in (to be transferred to Lag side) in the case of, flow is moved to step ST5.

Next, in step ST4, determine whether exhaust side vvt mechanism 100ex is transferred to side in advance.Note that the row of determination Whether gas side vvt mechanism 100ex, which is transferred to side in advance, is executed based on the target phase angles of air bleeding valve 14 and actual phase angle 's.Also that is, by the actual phase angle ExFPA of calculated air bleeding valve 14 in step ST1 and the calculated row in step ST2 The target phase angles ExTPA of air valve 14 is compared, and is less than the feelings of actual phase angle ExFPA in target phase angles ExTPA Under condition, determine that exhaust side vvt mechanism 100ex is transferred to side in advance.Then, it is transferred to side in advance in exhaust side vvt mechanism 100ex In the case of, flow is moved to step ST6.On the other hand, side in advance is not transferred in exhaust side vvt mechanism 100ex (to be transferred to Lag side) in the case of, flow is moved to step ST9.

In addition, in step ST5, determine whether exhaust side vvt mechanism 100ex is transferred to side in advance.Note that determining exhaust Whether side vvt mechanism 100ex, which is transferred to side in advance, is executed by method identical with the method in step ST4.Then, exist In the case that exhaust side vvt mechanism 100ex is transferred to side in advance, flow is moved to step ST9.On the other hand, in exhaust side VVT In the case that mechanism 100ex is not transferred to side (being transferred to lag side) in advance, flow is moved to step ST10.

Then, in the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date (in step ST3 and step ST4 It is), the target phase angles of intake valve 13 are recalculated in step ST6.This is because when base map values InTPA is used as increasing When the target phase angles of the intake valve 13 of the side overlapped greatly, there is a possibility that following：Due in the air bleeding valve for reducing overlapping side 14 subsequent delay, practical overlapping period FOPA are more than that target overlaps period TOPA.Also that is, as will be then described, Practical overlapping period FOPA is more than that target overlaps period TOPA in order to prevent, is recalculated in the intake valve 13 for increasing overlapping side Target phase angles.The target phase angles of intake valve 13 are calculated by following formula (2).

InTPA2=TOPA- (ExFPA+IOPA) ... (2)

In expression formula (2), InTPA2 is the target phase angles of the intake valve 13 recalculated.As shown in figure 5, target Phase angle InTPA2 (examples of third target phase angles) is no more than the value of base map values InTPA.

In expression formula (2), for example, reaching target phase angles (base map values) in the actual phase angle InFPA of intake valve 13 In the case that practical overlapping period FOPA has reached target overlapping period TOPA before InTPA, the practical phase of air bleeding valve 14 is waited for The variation of parallactic angle ExFPA, and target phase angles InTPA2 is with actual phase angle ExFPA variations and close to base map values InTPA. Then, when the actual phase angle ExFPA of air bleeding valve 14 becomes equal to target phase angles (base map values) ExTPA, intake valve 13 Target phase angles InTPA2 becomes equal to base map values InTPA.Also that is, the target phase angles InTPA2 recalculated is for row The desired value of the intake valve 13 that can be allowed in following range of the actual phase angle ExFPA of air valve 14, in the range Interior, practical overlapping period FOPA is no more than target and overlaps period TOPA.

Hereafter, in step ST7, it is determined whether establish negative overlapping.Specifically, it is determined that whether meeting following formula (3), in the case where being unsatisfactory for expression formula (3), each of the valve timing of intake valve 13 and the valve timing of air bleeding valve 14 are determined It is set so that negative overlapping generation.Then, overlapping generation is born, flow is moved to step ST9.On the other hand, it is overlapped not negative In the case of generation (overlapping to occur), flow is moved to step ST8.

InTPA≥-IOPA-ExFPA...(3)

In expression formula (3), as shown in fig. 6, determining whether the target phase angles InTPA of intake valve 13 is located at by that will arrange The actual phase angle ExFPA of air valve 14 is subtracted from the range of negative overlapping interval I OPA in the initial state and the region that obtains In, in the case where target phase angles InTPA is located in the region, it is unsatisfactory for expression formula (3), and determine negative overlapping hair It is raw.

Then, as shown in figure 5, (no in step ST7) will be in step in step ST8 at the overlapping time The target phase angles InTPA2 recalculated in ST6 is set as the target phase angles in the intake valve 13 for increasing overlapping side, And by step ST2 calculated base map values ExTPA be set as the target phase in the air bleeding valve 14 for reducing overlapping side Angle.Also that is, in the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date, at the overlapping time, base figure will be not more than When the target phase angles that the target phase angles InTPA2 of value InTPA recalculated is set as intake valve 13 make practical overlapping Section FOPA is no more than target and overlaps period TOPA.

Note that at the overlapping time ,-IOPA-ExFPA is set as to the lower limit protection of the target phase angles of intake valve 13 Value, to prevent target phase angles that there is unnecessary low value.Also that is, the intake valve 13 recalculated target phase angles In the case that InTPA2 is less than lower limit protective value (- IOPA-ExFPA), lower limit protective value is set as to the target phase of intake valve 13 Parallactic angle.Note that IOPA is the overlapping period in the initial state, and ExFPA is the actual phase angle of air bleeding valve 14.

It on the other hand, as shown in fig. 6, when negative overlapping occur (in step ST7 be), will be in step in step ST9 Calculated base map values InTPA is set as the target phase angles of intake valve 13 in rapid ST2, and will be calculated in step ST2 Base map values ExTPA be set as the target phase angles of air bleeding valve 14.Also that is, the valve timing in intake valve 13 and air bleeding valve 14 shifts to an earlier date In the case of, when negative overlapping generation, it is not necessary to limit the target phase angles of intake valve 13, and therefore set base map values InTPA It is set to the target phase angles of intake valve 13.

In the case of the valve timing of intake valve 13 and air bleeding valve 14 lag (no in step ST3 and step ST5), in step The target phase angles of air bleeding valve 14 are recalculated in rapid ST10.This is because when base map values ExTPA be used as increase it is overlapping When the target phase angles of the air bleeding valve 14 of side, there are following situations：Due to reducing the subsequent of the intake valve 13 of overlapping side Delay, practical overlapping period FOPA are more than that target overlaps period TOPA.Also real in order to prevent that is, as will be then described Border overlaps period FOPA more than target overlapping period TOPA, recalculates the target phase in the air bleeding valve 14 for increasing overlapping side Angle.The target phase angles of air bleeding valve 14 are calculated by following formula (4).

ExTPA2=TOPA- (InFPA+IOPA) ... (4)

In expression formula (4), ExTPA2 is the target phase angles of the air bleeding valve 14 recalculated.Target phase angles ExTPA2 (examples of the 4th target phase angles) is no more than the value of base map values ExTPA.

In expression formula (4), for example, reaching target phase angles (base map values) in the actual phase angle ExFPA of air bleeding valve 14 In the case that practical overlapping period FOPA has reached target overlapping period TOPA before ExTPA, the practical phase of intake valve 13 is waited for The variation of parallactic angle InFPA, and target phase angles ExTPA2 is with actual phase angle InFPA variations and close to base map values ExTPA. Then, when the actual phase angle InFPA of intake valve 13 becomes equal to target phase angles (base map values) InTPA, in air bleeding valve 14 Target phase angles ExTPA2 become equal to base map values ExTPA.Also that is, the target phase angles ExTPA2 recalculated is to be directed to The desired value of the air bleeding valve 14 that can be allowed in following range of the actual phase angle InFPA of intake valve 13, in the model In enclosing, practical overlapping period FOPA is no more than target and overlaps period TOPA.

Hereafter, in step ST11, determine whether negative overlap occurs.Specifically, it is determined that whether meeting following formula (5), and in the case where being unsatisfactory for expression formula (5), determination will be in the valve timing of intake valve 13 and the valve timing of air bleeding valve 14 Each of be set so that negative overlapping occur.Then, in the case of negative overlapping generation, flow is moved to step ST9.Another party Face, it is negative overlapping (overlapping to occur) does not occur in the case of, flow is moved to step ST12.

ExTPA≥-IOPA-InFPA...(5)

In expression formula (5), determine whether the target phase angles ExTPA of air bleeding valve 14 is located at by by the reality of intake valve 13 Border phase angle InFPA from subtracted in the range of negative overlapping interval I OPA in the initial state and in the region that obtains, in target In the case that phase angle ExTPA is located in the region, be unsatisfactory for expression formula (5), and determine intake valve 13 valve timing and Each of valve timing of air bleeding valve 14 is set so that negative overlapping generation.

(no in step ST11) will be recalculated in step ST12 in step ST10 at the overlapping time The target phase angles ExTPA2 gone out is set as the target phase angles in the air bleeding valve 14 for increasing overlapping side, and will be in step Calculated base map values InTPA is set as the target phase angles in the intake valve 13 for reducing overlapping side in ST2.Also that is, into It, will again no more than base map values ExTPA at the overlapping time in the case of the valve timing lag of air valve 13 and air bleeding valve 14 The target phase angles that calculated target phase angles ExTPA2 is set as air bleeding valve 14 make practical overlapping period FOPA be no more than Target overlaps period TOPA.

Note that at the overlapping time ,-IOPA-InFPA is set as to the lower limit protection of the target phase angles of air bleeding valve 14 Value, to prevent target phase angles that there is unnecessary low value.Also that is, the air bleeding valve 14 recalculated target phase angles In the case that ExTPA2 is less than lower limit protective value, lower limit protective value is set as to the target phase angles of air bleeding valve 14.Note that IOPA It it is the overlapping period in the initial state, and InFPA is the actual phase angle of intake valve 13.

On the other hand, when negative overlapping occur (in step ST11 be), in step ST9, will fall into a trap in step ST2 The base map values InTPA of calculating is set as the target phase angles of intake valve 13, and will in step ST2 calculated base map values ExTPA is set as the target phase angles of air bleeding valve 14.Also that is, the case where the valve timing of intake valve 13 and air bleeding valve 14 lags Under, when negative overlapping generation, it is not necessary to limit the target phase angles of air bleeding valve 14, and therefore be set as arranging by base map values ExTPA The target phase angles of air valve 14.

In the case where the valve timing of intake valve 13 shifts to an earlier date and the valve timing of air bleeding valve 14 lags (in step ST3, It is no in step ST4), the valve timing of intake valve 13 and air bleeding valve 14 is transferred to the side for increasing and overlapping the period, and therefore, real Border overlaps period FOPA no more than target overlapping period TOPA.Therefore, in step ST9, will in step ST2 calculated base Map values InTPA is set as the target phase angles of intake valve 13, and will the calculated base map values ExTPA settings in step ST2 For the target phase angles of air bleeding valve 14.

In the case where the valve timing of the valve timing lag of intake valve 13 and air bleeding valve 14 shifts to an earlier date (it is no in step ST3, In step ST5 is), the valve timing of intake valve 13 and air bleeding valve 14 is transferred to the side for reducing and overlapping the period, and therefore, In step ST9, by step ST2 calculated base map values InTPA be set as the target phase angles of intake valve 13, and will be Calculated base map values ExTPA is set as the target phase angles of air bleeding valve 14 in step ST2.

In the first embodiment, as described above, according to according to mode of operation (for example, the rotary speed of engine 1 and negative The lotus factor) base figure to calculate target phase angles (base map values) InTPA, and carried in the valve timing of intake valve 13 and air bleeding valve 14 Before in the case of, it is to be transferred to increase to hand over that the target phase angles InTPA2 no more than base map values InTPA, which is calculated (recalculating), The target phase angles of the intake valve 13 of the side of folded period.

Using the configuration, in the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date, at the overlapping time, lead to The target phase angles that the target phase angles InTPA2 that will be recalculated is set as intake valve 13 are crossed, when can prevent practical overlapping Section FOPA is more than that target overlaps period TOPA.In addition, in the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date, when negative When overlapping generation, by the way that base map values InTPA to be set as to the target phase angles of intake valve 13, the valve of intake valve 13 can promoted just The InTPA convergences of Shi Xiangji map values.Also that is, it is different when from overlapping generation, when negative overlapping generation, it is not necessary to limit the mesh of intake valve 13 Phase angle is marked, and base map values InTPA is therefore set as target phase angles.Therefore, in the valve of intake valve 13 and air bleeding valve 14 Can be more than that target promotes air inlet while overlapping period TOPA preventing practical overlapping period FOPA in the case that timing shifts to an earlier date The valve timing of valve 13 is restrained to base map values InTPA.As a result, the improvement of fuel efficiency can be obtained.

In addition, in the first embodiment, according to according to mode of operation (for example, the rotary speed of engine 1 and load because Son) base figure calculate target phase angles (base map values) ExTPA of air bleeding valve 14, and in the valve of intake valve 13 and air bleeding valve 14 In the case that timing lags, it is to be transferred to that the target phase angles ExTPA2 no more than base map values ExTPA, which is calculated (recalculating), Increase the target phase angles of the air bleeding valve 14 for the side for overlapping the period.

At the overlapping time, led in the case of the valve timing of intake valve 13 and air bleeding valve 14 lag using the configuration The target phase angles that the target phase angles ExTPA2 that will be recalculated is set as air bleeding valve 14 are crossed, when can prevent practical overlapping Section FOPA is more than that target overlaps period TOPA.In addition, in the case of the valve timing of intake valve 13 and air bleeding valve 14 lag, when negative When overlapping generation, by the way that base map values ExTPA to be set as to the target phase angles of air bleeding valve 14, the valve of air bleeding valve 14 can promoted just The ExTPA convergences of Shi Xiangji map values.Also that is, it is different when from overlapping generation, when negative overlapping generation, it is not necessary to limit the mesh of air bleeding valve 14 Phase angle is marked, and base map values ExTPA is therefore set as target phase angles.Therefore, in the valve of intake valve 13 and air bleeding valve 14 Can be more than that target promotes to be vented while overlapping period TOPA preventing practical overlapping period FOPA in the case that timing lags The valve timing of valve 14 is restrained to base map values ExTPA.As a result, the reduction of exhaust gas discharge can be obtained.

In addition, in the first embodiment, meet expression formula recited above (3) by determining whether, it can be easily Determine whether negative overlap occurs.Similarly, it by determining whether to meet expression formula recited above (5), can readily determine that Whether negative overlap occurs.

Next, the target phase angles of the valve timing by description second embodiment of the invention set control.Note Meaning, engine 1 and control engine 1 ECU 400 be configured to substantially in first embodiment engine 1 and control The ECU 400 of engine 1 is similar, and therefore, will omit the description to overlapping part.

When 21 closure or openness intake valve 13 of admission cam shaft, cam reaction force (from valve spring receive power) with The opened/closed of intake valve 13 operates and the cam reaction force acts that periodically increase or reduce, and increase or reduce On air inlet side vvt mechanism 100in.Similarly, when 22 closure or openness air bleeding valve 14 of exhaust cam shaft, cam reaction force The cam reaction force for periodically increasing or reducing with the opened/closed operation of air bleeding valve 14, and increasing or reducing It acts on exhaust side vvt mechanism 100ex.

When the cam reaction force acts increased or reduced are on air inlet side vvt mechanism 100in, there are intake valves 13 to exist Fluctuation in predetermined angular region (actual phase angle relative to target phase angles variation there is a situation where).In addition, when increasing or subtracting Small cam reaction force acts are fluctuated there are air bleeding valve 14 in predetermined angular region when on exhaust side vvt mechanism 100ex Situation.Therefore, actual phase angle has occurred relative to target in each of valve timing in intake valve 13 and air bleeding valve 14 When the variation at phase angle, there is a possibility that the practical overlapping period is more than target overlapping period and internal egr amount and becomes excessive.

In order to solve this problem, in this second embodiment, at the valve variation angle for considering to generate due to cam reaction force In the case of, or even when intake valve 13 and air bleeding valve 14 are fluctuated due to cam reaction force, by setting target phase angles It is more than that target overlaps the period to prevent the practical overlapping period.

Next, with reference to Fig. 7, description is set into control according to the target phase angles of the valve timing of second embodiment.Note The flow in Fig. 7 is repeatedly carried out with predetermined time interval by ECU 400 in meaning.In addition, step ST1 to ST5 and first is implemented Step ST1 to ST5 in mode is identical, and therefore, will omit the description to step ST1 to ST5.

In the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date (in step ST3 and step ST4 be), The target phase angles of intake valve 13 are recalculated in step ST6a.In this second embodiment, it calculates and is considering since cam is anti- The target phase angles of the intake valve 13 obtained in the case of the valve variation angle that active force generates.By following formula (6) come Calculate the target phase angles of intake valve 13.

InTPA3=TOPA- (ExFPA+ (IOPA+OSPA)) ... (6)

In expression formula (6), InTPA3 is the target phase angles of the intake valve 13 recalculated.Target phase angles InTPA3 (examples of the 5th target phase angles) is no more than the value of base map values InTPA.TOPA is calculated in step ST2 Target overlaps the period, and IOPA is the overlapping period in the initial state.ExFPA is the calculated exhaust in step ST1 The actual phase angle of valve 14.

OSPA is valve variation angle, and OSPA is the variation of the intake valve 13 by will be generated due to cam reaction force The value that the variation angle of angle (fluctuation angular region) and the air bleeding valve 14 generated due to cam reaction force is added together and obtains. Note that changing in the OSPA of angle in valve, predetermined allowance can be added to the variation angle of intake valve 13 and the variation angle of air bleeding valve 14 Total value.Valve variation angle OSPA is for example and to be stored in ROM 402 with the specification of engine 1 accordingly preset value In.

By the calculated target phase angles InTPA3 of expression formula (6) than being calculated by expression formula (2) described above The corresponding angles of the small variation angle OSPA with valve of target phase angles InTPA2 of first embodiment.Also that is, recalculating Target phase angles InTPA3 is following values, which is set so that practical overlapping period FOPA is no more than target and overlaps the period TOPA, in addition when (fluctuation) has been changed in intake valve 13 and air bleeding valve 14 due to cam reaction force it is also such.

Then, in step ST7a, determine whether negative overlap occurs.Specifically, it is determined that whether meeting following formula (7), and in the case where being unsatisfactory for expression formula (7), the valve timing of the valve timing and air bleeding valve 14 that determine intake valve 13 is set It is set to so that negative overlapping generation.Then, when negative overlapping generation, flow is moved to step ST9a.On the other hand, it is overlapped not when negative When (overlapping to occur) occurs, flow is moved to step ST8a.

InTPA≥-(IOPA+OSPA)-ExFPA...(7)

In expression formula (7), InTPA is the target phase angles (base map values) of the calculated intake valve 13 in step ST2. In step ST7a, the case where overlapping is established there is a possibility that variation (fluctuation) due to intake valve 13 and air bleeding valve 14 Under, determine that foundation is overlapping, wherein the variation (fluctuation) of intake valve 13 and air bleeding valve 14 is generated due to cam reaction force 's.

(no in step ST7a) will be recalculated in step ST8a in step ST6a at the overlapping time The target phase angles InTPA3 gone out is set as the target phase angles in the intake valve 13 for increasing overlapping side, and will be in step Calculated base map values ExTPA is set as the target phase angles in the air bleeding valve 14 for reducing overlapping side in ST2.

Note that at the overlapping time ,-IOPA-ExFPA is set as to the lower limit protection of the target phase angles of intake valve 13 Value, to prevent target phase angles that there is unnecessary low value.Also that is, the intake valve 13 recalculated target phase angles In the case that InTPA3 is less than lower limit protective value (- IOPA-ExFPA), lower limit protective value is set as to the target phase of intake valve 13 Parallactic angle.

It on the other hand, at the negative overlapping time occurred (in step ST7a be), will be in step in step ST9a Calculated base map values InTPA is set as the target phase angles of intake valve 13 in ST2, and will be calculated in step ST2 Base map values ExTPA is set as the target phase angles of air bleeding valve 14.

In the case of the valve timing of intake valve 13 and air bleeding valve 14 lag (no in step ST3 and step ST5), in step The target phase angles of air bleeding valve 14 are recalculated in rapid ST10a.In this second embodiment, it calculates and is considering to make since cam is counter The target phase angles of the air bleeding valve 14 obtained in the case of the valve variation angle firmly generated.By following formula (8) come Calculate the target phase angles of air bleeding valve 14.

ExTPA3=TOPA- (InFPA+ (IOPA+OSPA)) ... (8)

In expression formula (8), ExTPA3 is the target phase angles of the air bleeding valve 14 recalculated.Target phase angles ExTPA3 (examples of the 6th target phase angles) is no more than the value of base map values ExTPA.InFPA is calculated in step ST1 Intake valve 13 actual phase angle.

It is calculated by expression formula recited above (4) by the calculated target phase angles ExTPA3 ratios of expression formula (8) The corresponding angles the small variation angle OSPA with valve of target phase angles ExTPA2 of first embodiment.Also that is, the mesh recalculated It is following values to mark phase angle ExTPA3, which is set so that practical overlapping period FOPA is no more than target and overlaps the period TOPA, in addition when (fluctuation) has been changed in intake valve 13 and air bleeding valve 14 due to cam reaction force it is also such.

Hereafter, in step ST11a, it is determined whether establish negative overlapping.Specifically, it is determined that whether meeting following formula (9), and in the case where being unsatisfactory for expression formula (9), determination will be in the valve timing of intake valve 13 and the valve timing of air bleeding valve 14 Each of be set so that negative overlapping occur.Then, in the case of negative overlapping generation, flow is moved to step ST9a.It is another Aspect, it is negative overlapping (overlapping to occur) does not occur in the case of, flow is moved to step ST12a.

ExTPA≥-(IOPA+OSPA)-InFPA...(9)

In expression formula (9), ExTPA is the target phase angles (base map values) of the calculated air bleeding valve 14 in step ST2. In step ST11a, overlapping feelings are established there is a possibility that variation (fluctuation) due to intake valve 13 and air bleeding valve 14 Under condition, determine that foundation is overlapping, wherein the variation (fluctuation) of intake valve 13 and air bleeding valve 14 is generated due to cam reaction force 's.

Then, (no in step ST11a) will be in step ST10a in step ST12a at the overlapping time The target phase angles ExTPA3 recalculated is set as the target phase angles in the air bleeding valve 14 for increasing overlapping side, and will Calculated base map values InTPA is set as the target phase angles in the intake valve 13 for reducing overlapping side in step ST2.

At the overlapping time ,-IOPA-InFPA is set as to the lower limit protective value of the target phase angles of air bleeding valve 14, from And prevent target phase angles that there is unnecessary low value.Also that is, the air bleeding valve 14 recalculated target phase angles In the case that ExTPA3 is less than lower limit protective value (- IOPA-InFPA), lower limit protective value is set as to the target phase of air bleeding valve 14 Parallactic angle.

It on the other hand, when negative overlapping occur (in step ST11a be), will be in step ST2 in step ST9a Calculated base map values InTPA is set as the target phase angles of intake valve 13, and will in step ST2 calculated base map values ExTPA is set as the target phase angles of air bleeding valve 14.

In the case where the valve timing of intake valve 13 shifts to an earlier date and the valve timing of air bleeding valve 14 lags (in step ST3, It is no in step ST4), the valve timing of intake valve 13 and air bleeding valve 14 is transferred to the side for increasing and overlapping the period, and therefore, real Border overlaps period FOPA no more than target overlapping period TOPA.It therefore, will be calculated in step ST2 in step ST9a Base map values InTPA is set as the target phase angles of intake valve 13, and calculated base map values ExTPA will be set in step ST2 It is set to the target phase angles of air bleeding valve 14.

In the case where the valve timing of the valve timing lag of intake valve 13 and air bleeding valve 14 shifts to an earlier date (it is no in step ST3, In step ST5 is), the valve timing of intake valve 13 and air bleeding valve 14 is transferred to the side for reducing and overlapping the period, and therefore, In step ST9a, by step ST2 calculated base map values InTPA be set as the target phase angles of intake valve 13, and will Calculated base map values ExTPA is set as the target phase angles of air bleeding valve 14 in step ST2.

As described above, in this second embodiment, in the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date, leading to Also change angle OSPA using valve to count in addition to crossing using period TOPA and actual phase angle ExTPA is overlapped except the target of air bleeding valve 14 It calculates (recalculating) and is transferred to the target phase angles InTPA3 for increasing the intake valve 13 for overlapping period side.In addition, in intake valve 13 In the case that valve timing with air bleeding valve 14 shifts to an earlier date, at the overlapping time, the target phase angles InTPA3 that will recalculate It is set as the target phase angles of intake valve 13.

Using the configuration, by set it is smaller than the target phase angles in first embodiment be directed to increasing for intake valve 13 The target phase angles InTPA3 at the corresponding angles valve variation angle OSPA of overlapping side greatly, can prevent practical overlapping period FOPA super Cross target and overlap period TOPA, in addition intake valve 13 and air bleeding valve 14 due to cam reaction force fluctuates when it is also such.Therefore, It can prevent internal egr amount from becoming excessive.

In addition, in this second embodiment, in the case of the valve timing of intake valve 13 and air bleeding valve 14 lag, by making Also change angle OSPA using valve to calculate in addition to overlapping period TOPA and actual phase angle InFPA except the target of intake valve 13 (recalculating) is transferred to the target phase angles ExTPA3 for increasing the air bleeding valve 14 for overlapping period side.In addition, in 13 He of intake valve In the case of the valve timing lag of air bleeding valve 14, at the overlapping time, the target phase angles ExTPA3 recalculated is set It is set to the target phase angles of air bleeding valve 14.

Using the configuration, by set it is smaller than the target phase angles in first embodiment be directed to increasing for air bleeding valve 14 The target phase angles ExTPA3 at the corresponding angles valve variation angle OSPA of overlapping side greatly, can prevent practical overlapping period FOPA super Cross target and overlap period TOPA, in addition intake valve 13 and air bleeding valve 14 due to cam reaction force fluctuates when it is also such.Therefore, It can prevent internal egr amount from becoming excessive.

In addition, in this second embodiment, by determining, in the case where considering that valve changes angle OSPA, whether negative overlap is sent out It is raw, it may be determined that be handed in the case where there is a possibility that the variation (fluctuation) due to intake valve 13 and air bleeding valve 14 overlaps generation It is folded to occur, wherein the variation (fluctuation) of intake valve 13 and air bleeding valve 14 is generated due to cam reaction force.

Note that other effects of second embodiment are identical as other effects of first embodiment.

It should be noted that embodiments disclosed herein is illustrative at each aspect, and any restrictions are not formed Property understand basis.Therefore, technical scope of the invention should not understand using only embodiment, and should be wanted based on right It asks to limit.In addition, the technical scope of the present invention includes any modification in the meaning and range being equal with claim.

For example, following examples have been described in first embodiment：Shift to an earlier date in the valve timing of intake valve 13 and air bleeding valve 14 In the case of, when negative overlapping generation, base map values InTPA is set as to the target phase angles of intake valve 13, and in intake valve 13 In the case that valve timing with air bleeding valve 14 lags, when negative overlapping generation, base map values ExTPA is set as to the mesh of air bleeding valve 14 Mark phase angle, however, the present invention is not limited thereto.In the case where the valve timing of intake valve 13 and air bleeding valve 14 shifts to an earlier date, when negative overlapping It, can be in intake valve 13 and air bleeding valve when base map values InTPA being set as the target phase angles of intake valve 13 in the case of generation In the case of 14 valve timing lag, when negative overlapping generation, the target phase angles ExTPA2 recalculated is set as arranging The target phase angles of air valve 14.Similarly, in the case of the valve timing of intake valve 13 and air bleeding valve 14 lag, when negative overlapping It, can be in intake valve 13 and air bleeding valve when base map values ExTPA being set as the target phase angles of air bleeding valve 14 in the case of generation In the case that 14 valve timing shifts to an earlier date, when negative overlapping occur, by the target phase angles InTPA2 recalculated be set as into The target phase angles of air valve 13.

In addition, first embodiment has been described by oil inlet side control valve 200in control air inlet side vvt mechanisms 100in's Example, however, the present invention is not limited thereto, and air inlet side vvt mechanism can also be electronics air inlet side vvt mechanism.Note that equally applicable In exhaust side vvt mechanism 100ex.

In addition, first embodiment has been described that the operating angle of intake valve 13 and air bleeding valve 14 is the example of constant, but this Invent without being limited thereto, and the operating angle of intake valve and air bleeding valve can also be variable.

In addition, first embodiment has been described to calculate base map values based on the rotary speed of engine 1 and stressor Example, however, the present invention is not limited thereto, and can also consider its other than the rotary speed of engine and stressor The case where his parameter, gets off to calculate base map values.

In addition, first embodiment has been described to determine negative hand over after the target phase angles for recalculating intake valve 13 The folded example whether occurred, however, the present invention is not limited thereto.It can determine whether negative overlap occurs, and negative overlapping nonevent In the case of, the target phase angles of intake valve can also be recalculated.Also that is, the flow chart of Fig. 4 is merely exemplary and it is of the invention It is not limited to the process of the flow chart of Fig. 4.

In addition, first embodiment has been described that engine 1 is the example of four-cylinder gasoline engine, but the present invention is not limited to This, and engine can be that the quantity of diesel engine and cylinder and the type (V-type or pancake) of engine can be with It is any quantity and any types.

In addition, first embodiment has been described that oil pump 19 is the example of mechanical oil pump, and however, the present invention is not limited thereto, and it is oily Pump can also be electronic oil pump.

In addition, first embodiment has been described that base map values InTPA and target based on intake valve 13 overlap period TOPA Come calculate air bleeding valve 14 base map values ExTPA example, however, the present invention is not limited thereto, and can also be from mapping vented exhaust valve Base map values.Alternatively, the period can also be overlapped from the target phase angles and target of mapping vented exhaust valve, and can also made The target phase angles of intake valve are calculated with the result.

Note that the modification described above to first embodiment can be adapted for second embodiment.

Second embodiment has been described that valve variation angle OSPA is the example of preset value, however, the present invention is not limited thereto, and valve Variation angle can also be the calculated calculated value of mode of operation according to engine.

Claims

1. a kind of control device for internal combustion engine,

The internal combustion engine includes intake valve, air bleeding valve, air inlet side variable valve timing mechanism and exhaust side variable valve timing mechanism,

The air inlet side variable valve timing mechanism is configured to change the first valve timing, and the first valve timing is the intake valve Valve timing,

The exhaust side variable valve timing mechanism is configured to change the second valve timing, and the second valve timing is the air bleeding valve Valve timing,

The control device includes：

Electronic control unit, the electronic control unit are configured to：

The first object phase angle of the intake valve, the row are calculated based on the rotary speed of the internal combustion engine and stressor The second target phase angles and target of air valve overlap the period；

When the first valve timing and the second valve timing shift to an earlier date, period and the second actual phase are overlapped based on the target Angle calculates third target phase angles, and second actual phase angle is the actual phase angle of the air bleeding valve, and described Three target phase angles are the target phase angles of the intake valve；

When the first valve timing and the second valve timing shift to an earlier date, second target phase angles are set as the exhaust The target phase angles of valve and the target phase angles that the third target phase angles are set as to the intake valve；And

When the first valve timing and the second valve timing are so that bearing overlapping occur in advance, by second target phase Angle is set as the target phase angles of the air bleeding valve and the first object phase angle is set as to the target of the intake valve Phase angle,

Negative overlap is following state：It made in the period from the unlatching for being closed into the intake valve of the air bleeding valve Both the intake valve and the air bleeding valve are in closed state.

2. control device according to claim 1, wherein

The electronic control unit is configured to be based in the case where the first valve timing and the second valve timing shift to an earlier date The first object phase angle and second actual phase angle of the air bleeding valve determine the first valve timing and described Whether the second valve timing is set so that the negative overlapping generation.

3. control device according to claim 1 or 2, wherein

The electronic control unit is configured to work as the first valve timing and the second valve timing ratchet time-base in the mesh Mark overlaps period and the first actual phase angle to calculate the 4th target phase angles,

4th target phase angles are the target phase angles of the air bleeding valve, and first actual phase angle be it is described into The actual phase angle of air valve,

The electronic control unit is configured to the described 4th when the first valve timing and the second valve timing lag Target phase angles are set as the target phase angles of the air bleeding valve and the first object phase angle are set as the air inlet The target phase angles of valve, and

The electronic control unit is configured to when the first valve timing and the second valve timing lag are described negative to make It is overlapping second target phase angles to be set as the target phase angles of the air bleeding valve when occurring and by the first object Phase angle is set as the target phase angles of the intake valve.

4. control device according to claim 3, wherein

The electronic control unit is configured to when the first valve timing and the second valve timing ratchet time-base are in described the First actual phase angle of two target phase angles and the intake valve determines described negative overlapping whether occur.

5. control device according to claim 1, wherein

The electronic control unit is configured to be based on the mesh when the first valve timing and the second valve timing shift to an earlier date Mark overlaps period, second actual phase angle of the air bleeding valve and valve variation angle to calculate the 5th mesh of the intake valve Mark phase angle, valve variation angle is the angular range of the fluctuation of the intake valve and the air bleeding valve, the fluctuation be due to With the opened/closed of the intake valve and the air bleeding valve operate and the cam reaction force that periodically increases or reduces and It generates.

6. control device according to claim 5, wherein

The electronic control unit is configured to when the first valve timing and the second valve timing shift to an earlier date based on described the One target phase angles, second actual phase angle of the air bleeding valve and valve variation angle are to determine negative overlap No generation.

7. control device according to claim 5 or 6, wherein

The electronic control unit is configured to work as the first valve timing and the second valve timing ratchet time-base in the mesh Mark overlaps period, the first actual phase angle of the intake valve and valve variation angle to calculate the 6th mesh of the air bleeding valve Phase angle is marked,

The electronic control unit is configured to the described 6th when the first valve timing and the second valve timing lag Target phase angles are set as the target phase angles of the air bleeding valve and the first object phase angle are set as the air inlet The target phase angles of valve, and

The electronic control unit is configured to when the first valve timing and the second valve timing lag are described negative to make It is overlapping the first object phase angle to be set as the target phase angles of the intake valve when occurring and by second target Phase angle is set as the target phase angles of the air bleeding valve.

8. control device according to claim 7, wherein

The electronic control unit is configured to when the first valve timing and the second valve timing ratchet time-base are in described the Two target phase angles, first actual phase angle of the intake valve and valve variation angle are to determine negative overlap No generation.

9. a kind of control device for internal combustion engine,

The control device includes：

Electronic control unit, the electronic control unit are configured to：

When the first valve timing and the second valve timing lag, period and the first actual phase are overlapped based on the target Angle calculates the 4th target phase angles, and the 4th target phase angles are the target phase angles of the air bleeding valve, and described first is real Border phase angle is the actual phase angle of the intake valve；

When the first valve timing and the second valve timing lag, the 4th target phase angles are set as the exhaust The target phase angles of valve and the target phase angles that the first object phase angle is set as to the intake valve；And

When the first valve timing and the second valve timing lag is so that bear overlapping occur, by second target phase Angle is set as the target phase angles of the air bleeding valve and the first object phase angle is set as to the target of the intake valve Phase angle,

10. a kind of control method for internal combustion engine,

The control method includes：