JP2005337263A - Operation control device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably prevent a torque shock from occurring in an operation control device provided with a control mechanism for changing the valve opening/closing timing and the valve opening amount of an intake valve or an exhaust valve. <P>SOLUTION: The operation control device for an internal combustion engine includes a transmission 60 for controlling the gear ratio, and an intake valve control mechanism for controlling the valve opening/closing timing and the valve opening amount of the intake valve 3. When the gear ratio is changed by the transmission, a target value of at least one of the valve opening/closing timing and the valve opening amount of the intake valve is changed by the intake valve control mechanism. The change amount of the valve opening/closing timing or the valve opening amount of the intake valve to be changed by the intake valve control mechanism when the gear ratio is changed by the transmission, is corrected according to the state related to the intake valve control mechanism. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an operation control apparatus for an internal combustion engine.

  A transmission for shifting and outputting an input speed with a predetermined speed ratio, wherein the speed ratio can be varied substantially continuously in time between relatively different speed ratios. It is known. As such a transmission, there is an automatic transmission using a planetary gear. When this automatic transmission changes the gear ratio from a certain gear ratio to another small gear ratio that is relatively different from this, the torque output from this automatic transmission (hereinafter referred to as output torque) is abruptly and rapidly increased. A so-called torque shock increases. A technique for suppressing the occurrence of torque shock is disclosed in Patent Document 1. The internal combustion engine of Patent Document 1 includes an on-off valve timing changing mechanism that can advance or delay the on-off valve timing of the intake valve, and temporarily changes the speed ratio of the automatic transmission when the speed ratio is changed to a small speed ratio. The on / off valve timing change mechanism delays the on / off valve timing of the intake valve, thereby reducing the engine load (hereinafter referred to as output engine load) output from the internal combustion engine and thus suppressing the occurrence of torque shock. .

JP-A-4-303153

  Incidentally, in Patent Document 1, the on-off valve timing changing mechanism changes the on-off valve timing of the intake valve by a mechanism using hydraulic pressure. However, when the temperature of the internal combustion engine is relatively low, the viscosity of the hydraulic oil is large. In this way, when the hydraulic oil viscosity is high, a command signal is issued to change the opening / closing valve timing of the intake valve, and even if the hydraulic oil is caused to flow, the hydraulic oil does not flow as desired. Does not change immediately. For this reason, it takes time until the opening / closing valve timing of the intake valve is actually changed. That is, even if a command signal is issued to the opening / closing valve timing changing means to delay the opening / closing valve timing of the intake valve in order to reduce the output engine load when the gear ratio of the automatic transmission is changed, the opening / closing valve timing is not immediately delayed. Therefore, the occurrence of torque shock cannot be suppressed.

  Such a problem is generally provided with a control mechanism for controlling a certain amount of substance (especially intake air amount or exhaust air amount) that affects the output torque, and the control value of the control mechanism is set when the gear ratio is changed. The operation control device that controls the amount of the substance and decreases or increases the output torque by a predetermined amount and thus suppresses the occurrence of torque shock is a problem that occurs equally.

  Accordingly, an object of the present invention is to reliably suppress the occurrence of torque shock in an operation control apparatus having a control mechanism for changing the opening / closing valve timing and valve opening amount of an intake valve or an exhaust valve.

  In order to solve the above-mentioned problem, the first invention comprises a transmission for controlling the transmission gear ratio, and an intake valve control mechanism for controlling the opening / closing timing and opening amount of the intake valve, In the internal combustion engine operation control apparatus, wherein the target value of at least one of the opening / closing valve timing and the valve opening amount of the intake valve is changed by the intake valve control mechanism when the transmission ratio is changed by the transmission, A shift time correction process is executed to correct the change amount of the intake valve opening / closing valve timing or valve opening amount that is changed by the intake valve control mechanism when changing the gear ratio according to the state related to the intake valve control mechanism.

In the second invention, in the first invention, the shift correction process is executed, and the control amount of the control mechanism other than the intake valve control mechanism of the internal combustion engine is changed.
In a third aspect of the present invention, in order to solve the above-described problem, a transmission for controlling the gear ratio, and an exhaust valve control mechanism for controlling the opening / closing valve timing and the valve opening amount of the exhaust valve are provided. In the operation control device for an internal combustion engine in which at least one target value of the opening / closing valve timing and the valve opening amount of the exhaust valve is changed by the exhaust valve control mechanism when the transmission gear ratio is changed by the transmission, A shift correction process is performed to correct the opening / closing valve timing of the exhaust valve or the amount of change of the valve opening amount that is changed by the exhaust valve control mechanism when changing the gear ratio according to the state relating to the exhaust valve control mechanism.

According to a fourth aspect, in the third aspect, the shift correction process is executed and the control amount of a control mechanism other than the exhaust valve control mechanism of the internal combustion engine is changed.
In a fifth aspect of the present invention, in order to solve the above-described problem, a transmission for controlling the transmission, an intake valve control mechanism for controlling the opening / closing timing and opening amount of the intake valve, and opening / closing of the exhaust valve An exhaust valve control mechanism for controlling the valve timing and the valve opening amount, and when the transmission gear ratio is changed by the transmission, the opening / closing valve timing and valve opening amount of the intake valve, and the opening / closing valve timing of the exhaust valve; In an operation control device for an internal combustion engine, wherein at least one target value of the valve opening amount is changed by the intake valve control mechanism or the exhaust valve control mechanism, the intake valve control mechanism when the transmission gear ratio is changed by the transmission Alternatively, the intake valve on / off valve timing or valve opening amount or the exhaust valve on / off valve timing or valve opening change amount changed by the exhaust valve control mechanism can be changed. When the shift or the valve opening amount should be changed, the shift is corrected according to the state related to the intake valve control mechanism, and when the opening / closing valve timing or the valve opening amount of the exhaust valve should be changed, the correction is made according to the state related to the exhaust valve control mechanism. Execute correction processing.

In a sixth aspect, in the fifth aspect, the shift correction process is executed, and the control amount of a control mechanism other than the intake valve control mechanism and the exhaust valve control mechanism of the internal combustion engine is changed.
In a seventh aspect of the invention, in order to solve the above-described problem, a transmission for shifting and outputting an input speed with a predetermined gear ratio, an on-off valve timing and an opening amount of an intake valve using hydraulic pressure An intake valve characteristic changing mechanism for changing the transmission, the transmission can change its transmission ratio, and the engine load output from the internal combustion engine when the transmission transmission ratio is changed is In an internal combustion engine operation control device in which the opening / closing valve timing or valve opening amount is changed by the intake valve characteristic changing mechanism so as to decrease by a predetermined load, it is related to the value of the engine load output from the internal combustion engine. Operation changing means for changing the operation of the operating element mechanically, electrically or electronically, and even when the transmission gear ratio is changed, the temperature of the internal combustion engine is set in advance. Defined temperature When the engine cold shift is lower, the operation of the operating element is changed so that the engine load output from the internal combustion engine is reduced by the operation changing means without changing the opening / closing valve timing or valve opening amount. Like that. According to this, when the gear ratio of the transmission is changed when the temperature of the internal combustion engine is higher than a predetermined temperature, the opening / closing valve timing of the intake valve is changed using hydraulic pressure, and the temperature of the internal combustion engine is set in advance. When the temperature is lower than a predetermined temperature, when the transmission gear ratio is changed, the operation of the operation element whose operation is controlled mechanically, electrically, or electronically without using the hydraulic pressure is changed. The

According to an eighth aspect, in the seventh aspect, the operating element is an intake throttle valve, and the opening of the intake throttle valve is reduced by the operation changing means at the time of engine cold shift.
In the ninth aspect, in the eighth aspect, the transmission changes the transmission ratio between different transmission ratios that are greater than or equal to a predetermined value.

  The technical idea of the present invention includes a control mechanism for controlling a specific amount of substance that affects the output torque, and controls the amount of substance by setting a control value of the control mechanism when changing the gear ratio. The present invention is equally applicable to an operation control apparatus that reduces or increases the output torque by a predetermined amount, and thus suppresses the occurrence of torque shock when changing the gear ratio. The feature of the technical idea of the present invention is that in such an operation control device, the control value of the control mechanism at the time of changing the gear ratio is corrected in accordance with the factors involved in the operation characteristics of the control mechanism, and the output torque is ensured when the gear ratio is changed. In other words, the desired amount is reduced or increased, and thus the occurrence of torque shock at the time of changing the gear ratio is suppressed.

  Another technical feature of the present invention is that in the above-described operation control device, the control value of the control mechanism at the time of changing the gear ratio is corrected according to a factor related to the operating characteristics of the control mechanism, and a certain substance The control value of a control mechanism other than the control mechanism for controlling the amount is also corrected, and the output torque is decreased or increased by the desired amount, so that the torque shock when changing the gear ratio is changed. It is to suppress the occurrence of. This is because the influence of factors related to the operation characteristics of the control mechanism is extremely large. Therefore, if only the control value of the control mechanism is corrected in accordance with these factors, the output torque can be reduced or increased by the expected amount. It is especially effective when it is not possible. However, even when the influence of factors related to the operation characteristics of the control mechanism is not so great, the control value of another control mechanism may be corrected together as necessary.

Of course, in the above operation control device, when a factor related to the operation characteristic of the control mechanism has a great influence on the operation characteristic of the control mechanism, the setting value of the control mechanism is not corrected without correcting the setting value of the control mechanism. Only the value may be corrected.
The factors involved in the operating characteristics of the control mechanism include, for example, the temperature of the internal combustion engine, the intake valve control when the control mechanism is an intake valve control mechanism capable of changing the opening / closing valve timing and the valve opening amount of the intake valve. Hydraulic oil temperature, intake valve control oil pressure, internal combustion engine lubricating oil temperature, internal combustion engine lubricating oil pressure, internal combustion engine cooling water temperature, internal combustion engine cooling water pressure, intake valve lift amount (and its changing speed) , Intake valve opening and closing valve timing (and its changing speed), temperature of the electromagnetic force generating coil when the intake valve is driven by electromagnetic force, and electrical characteristic values related to the coil (for example, coil Resistance, voltage supplied to the coil, and current).

  Further, when the control mechanism is an exhaust valve control mechanism capable of changing the opening / closing timing and opening amount of the exhaust valve, the various causes include, for example, the temperature of the internal combustion engine, the temperature of the hydraulic oil for controlling the exhaust valve , Oil pressure for exhaust valve control, lubricating oil temperature of internal combustion engine, lubricating oil pressure of internal combustion engine, cooling water temperature of internal combustion engine, cooling water pressure of internal combustion engine, lift amount of exhaust valve (and its changing speed), opening and closing of exhaust valve When the valve timing (and its speed of change) is driven by an electromagnetic force, the exhaust valve temperature, coil temperature for electromagnetic force generation, and electrical characteristics related to the coil (eg coil resistance, supply to the coil) Voltage, current).

  Further, a control mechanism different from the above control mechanism is, for example, an internal combustion engine in which an intake throttle valve (that is, an electronic intake throttle valve), a fuel injection valve, a spark plug, and exhaust gas are circulated from the engine exhaust passage to the engine intake passage. This is an exhaust gas circulation amount control valve for controlling the amount of exhaust gas to be circulated. The control value when the intake throttle valve is adopted is the opening degree, and the control value when the fuel injection valve is adopted is the fuel injection amount and The control value when the fuel injection timing and the spark plug are employed is the ignition timing, and the control value when the exhaust gas circulation control valve is employed is the opening degree. How to correct these control values can be appropriately determined according to the case where the output torque is reduced or the output torque is increased, which will be apparent to those skilled in the art and is not illustrated. To do.

  According to the first and third inventions, the intake valve control mechanism or the exhaust valve control mechanism at the time of changing the gear ratio according to the state of the intake valve control mechanism or the exhaust valve control mechanism for controlling the on-off valve timing and the valve opening amount By correcting the control value, it is possible to suppress the occurrence of torque shock when changing the gear ratio.

According to the fifth aspect of the invention, the control values of the intake valve control mechanism and the exhaust valve control mechanism when changing the gear ratio according to the states of the intake valve control mechanism and the exhaust valve control mechanism for controlling the on-off valve timing and the valve opening amount By correcting this, it is possible to suppress the occurrence of torque shock when changing the gear ratio.
According to the seventh invention, when the transmission gear ratio is changed when the temperature of the internal combustion engine is higher than a predetermined temperature, the opening / closing valve timing of the intake valve is changed using the hydraulic pressure, and the internal combustion engine Operation of an operating element whose operation is controlled mechanically, electrically, or electronically without using hydraulic pressure when the transmission gear ratio is changed when the temperature is lower than a predetermined temperature Is changed. When the temperature of the internal combustion engine is higher than a predetermined temperature, the viscosity of the hydraulic oil is relatively low, and when the transmission gear ratio is changed, the opening / closing valve timing of the intake valve is changed to reduce the output engine load. When the command signal is issued, the hydraulic fluid immediately flows, and the opening / closing valve timing of the intake valve can be changed. For this reason, generation | occurrence | production of the torque shock when the gear ratio of a transmission is changed is suppressed. On the other hand, when the temperature of the internal combustion engine is lower than the predetermined temperature, the viscosity of the hydraulic oil is relatively high, and the opening / closing timing of the intake valve is set in the same manner as when the temperature of the internal combustion engine is higher than the predetermined temperature. Even if a command signal for changing is issued, it is difficult for the hydraulic oil to flow, and the timing of the opening / closing valve of the intake valve cannot be changed immediately, but according to the present invention, the temperature of the internal combustion engine is set to a predetermined temperature. When the gear ratio is lower than the above, when the transmission gear ratio is changed, the operation of the operation element whose operation is controlled mechanically, electrically, or electronically without using the hydraulic pressure is changed. . For this reason, even when the temperature of the internal combustion engine is low, it is possible to suppress the occurrence of torque shock when the transmission gear ratio is changed.

  Examples of the present invention will be described below. The embodiment described below adopts an intake valve control mechanism that can change the opening / closing valve timing and the valve opening amount of the intake valve as a control mechanism, and controls the intake air amount as a control mechanism different from this. In an operation control device that adopts an intake throttle valve that can reduce the output torque by correcting the control value of the intake valve control mechanism when the gear ratio is changed, and suppresses the occurrence of torque shock. This example employs an example in which the control value of the intake throttle valve is corrected when the influence of factors relating to the operation characteristics of the intake valve control mechanism is extremely large.

  FIG. 1 shows an internal combustion engine provided with the operation control device of this embodiment. The internal combustion engine shown in FIG. 1 is a so-called four-cycle gasoline engine. In FIG. 1, 1 is an engine body, 2 is an intake port, 3 is an intake valve, 4 is an exhaust port, 5 is an exhaust valve, 6 is a combustion chamber, and 7 is a spark plug. A piston 8 is disposed in the combustion chamber 6. The intake valve 3 is driven to open and close by an intake valve operating characteristic changing mechanism. The intake valve operating characteristic changing mechanism will be described in detail later. A water temperature sensor 61 for detecting the temperature of cooling water for cooling the engine body 1 is attached to the engine body 1. In this embodiment, the temperature of the internal combustion engine is estimated from the cooling water temperature detected by the water temperature sensor 61.

  The intake port 2 is connected to the intake manifold 9. The intake manifold 9 is connected to an intake passage 11 via a surge tank 10. A mass flow rate detector 12 for detecting a mass flow rate of air sucked into the engine body 1 (hereinafter referred to as an intake air amount) is disposed in the intake passage 11. An air cleaner 13 is connected to the intake passage 5 on the upstream side of the mass flow detector 12. On the other hand, an intake throttle valve (throttle valve) 15 that is normally fully opened is disposed in the intake passage 5 on the downstream side of the mass flow detector 12. The intake throttle valve 15 is an operating element that is electronically operated via a step motor (not shown) or the like. A fuel injection valve 16 is attached to the intake manifold 9 on the downstream side of the intake throttle valve 15 and in the vicinity of the intake port 2. The fuel injection valve 16 is connected to a fuel tank 18 via a fuel supply passage 17. A fuel pump 19 having a variable discharge amount is disposed in the fuel supply passage 17. The exhaust port 4 is connected to the exhaust manifold 20. The exhaust manifold 20 is connected to the exhaust passage 21.

An ignition distributor 25 is attached to the engine body 1. Two crank angle sensors 26 and 27 are attached to the ignition distributor 25. In this embodiment, the engine speed is calculated based on the pulse signals output from the crank angle sensors 26 and 27.
The internal combustion engine includes an electronic control unit 50. The electronic control unit 50 is composed of a digital computer and is connected to each other by a bidirectional bus 51. A ROM (read only memory) 52, a RAM (random access memory) 53, a CPU (microprocessor) 54, an input port 55, and an output port. 56. The mass flow detector 12 is connected to the input port 55 via a corresponding AD converter 57. The crank angle sensors 26 and 27 are directly connected to the input port 55. The spark plug 7, the fuel injection valve 16, the fuel pump 19, and the water temperature sensor 61 are connected to the output port 56 via a corresponding drive circuit 58. A load sensor 28 is connected to the accelerator pedal 14. The load sensor 28 detects an engine load required for the internal combustion engine (hereinafter referred to as a required engine load). The load sensor 28 is connected to the input port 55 via a corresponding AD converter 57.

  Next, the intake valve operating characteristic changing mechanism will be briefly described with reference to FIGS. FIG. 2 is an overall view of the intake valve operating characteristic changing mechanism. The intake valve operating characteristic changing mechanism mainly includes a mechanism for changing the valve closing timing of the intake valve 3 (hereinafter referred to as a valve closing timing changing mechanism) and a mechanism for changing the valve opening amount of the intake valve 3 (hereinafter referred to as opening). Valve amount changing mechanism). The valve closing timing changing mechanism is shown in detail in FIG. 3, and the valve opening amount changing mechanism is shown in detail in FIG. A valve opening timing changing mechanism for changing the valve opening timing of the intake valve 3 may be employed instead of the valve closing timing changing mechanism.

  The valve closing timing changing mechanism has a rotor 43 and a housing 44 as shown in FIG. The rotor 43 is accommodated in the housing 44 so as to be rotatable within a certain range. The rotor 43 is attached to the camshaft 34 so as not to rotate. Further, as shown in FIG. 3, the rotor 43 has four blades 45 extending radially outward from the outer peripheral wall surface thereof. On the other hand, the housing 44 has four partition walls 46 extending radially inward from the inner peripheral wall surface thereof. When the rotor 43 is accommodated in the housing 44, eight compartments 47 a and 47 b are formed between the blades 45 and the partition wall 46. A hydraulic pump 49 is connected to these compartments via a switching valve 48. When the hydraulic oil in the hydraulic oil tank 41 is supplied to the compartment 47a, the valve closing timing is advanced. On the other hand, when hydraulic oil is supplied to the compartment 47b, the valve closing timing is delayed. Thus, the valve closing timing of the intake valve 3 can be changed by changing the compartment to which the hydraulic oil is supplied. The housing 44 is a gear, and engages with a gear 60 that is rotated by the output of the internal combustion engine as shown in FIG.

  On the other hand, the valve opening amount changing mechanism includes three cams 32a, 32b, and 32c and three lift arms 33a, 33b, and 33c corresponding to these cams as shown in FIG. The amount by which each cam lifts the intake valve 3, that is, the valve opening amount is different. As shown in FIG. 4, one through hole 36 is formed at the end of the central lift arm 33a. Hydraulic chambers 37b and 37c are formed at the ends of the remaining two lift arms 33b and 33c, respectively. Corresponding pins 38b and 38c are slidably accommodated in the hydraulic chambers 37b and 37c, respectively. These hydraulic chambers 37 b and 37 c are connected to a hydraulic pump 49 through a switching valve 40. When the hydraulic oil in the hydraulic oil tank 41 is not supplied to any of the hydraulic chambers 37b and 37c, the intake valve 3 is driven to open by the cam 33a. At this time, the valve opening amount of the intake valve 3 is the smallest amount. When the hydraulic oil is supplied to the hydraulic chamber 37b, the intake valve 3 is driven to open by the cam 33b. At this time, the opening amount of the intake valve 3 is a medium amount. Further, when hydraulic oil is supplied to the hydraulic chamber 37c, the intake valve 3 is driven to open by the cam 33c. The opening amount of the intake valve 3 at this time is the largest amount. Thus, by changing the hydraulic chamber to which hydraulic oil is supplied, the valve opening amount of the intake valve 3 can be changed, and the intake air amount supplied into the combustion chamber 6 can be controlled.

Thus, both the valve closing timing changing mechanism and the valve opening amount changing mechanism of the present embodiment are driven using hydraulic pressure.
Now, the internal combustion engine of the present embodiment includes a transmission 60 for shifting and outputting an input speed with a predetermined gear ratio. The transmission 60 sets an optimum gear ratio according to the engine speed and the required engine load, and automatically changes the current gear ratio to the newly set gear ratio. Thus, the plurality of gear ratios set according to the engine speed and the required engine load are gear ratios different from each other by a relatively large value. The transmission 60 changes the gear ratio substantially continuously in time. For example, the transmission 60 is an automatic transmission that uses planetary gears. The transmission 60 is connected to the output port 56 via the drive circuit 58. Examples of the transmission to which the present invention can be applied include a stepped automatic transmission, a continuously variable transmission, and a continuously variable transmission capable of manual transmission. Furthermore, the transmission is disposed between the internal combustion engine and the drive wheel of the vehicle so that the power of the internal combustion engine can be transmitted to the drive wheel of the vehicle. The present invention can also be applied to a so-called parallel hybrid vehicle that includes an internal combustion engine and an electric motor, and is driven by a combination of power from the internal combustion engine and the electric motor.

  Next, operation control of the internal combustion engine of the present embodiment will be described. The engine operation control of the present embodiment has three types of control according to the engine operation state, that is, when the gear ratio of the transmission 60 is changed in a state where the temperature of the internal combustion engine is relatively high, the gear ratio of the transmission 60 is particularly Engine operation control after warm-up executed when the gear ratio is changed to a smaller gear ratio, and when the gear ratio of the gear ratio 60 is changed in a state where the temperature of the internal combustion engine is relatively low, especially the gear shift of the transmission 60. Cold engine operation control executed when the ratio is changed to a smaller gear ratio, and normal engine operation executed in engine operation states other than these warm-up engine operation control and cold engine operation control Divided into control.

  First, for convenience of explanation, normal engine operation control will be described. In the normal engine operation control, as shown in FIG. 5, in the present embodiment, the operation parameters of three operation elements, that is, the closing of the intake valve 3, according to the required intake air amount Ga that changes substantially in proportion to the required engine load L. The valve timing IT, the valve opening amount IA of the intake valve 3 and the valve opening amount TA of the intake throttle valve 15 are determined and their operations are controlled. In this embodiment, the operating parameters of each operating element are directly controlled based on the required intake air amount Ga. However, as a result, the operating parameters of each operating element are controlled based on the required engine load L. It will also be.

  More specifically, the base valve closing timing BIT of the intake valve 3 is determined earlier as the required intake air amount Ga increases. The base valve opening amount BIA of the intake valve 3 is determined to be a low amount a when the required intake amount Ga is smaller than the first threshold value Ga1, and is medium when it is larger than the first threshold value Ga1 and smaller than the second threshold value Ga2. The position amount b is determined, and when it is larger than the second threshold Ga2, it is determined as the high amount c. Here, the low amount a is a parameter for opening and closing the intake valve 3 by the cam 33a, the intake amount actually sucked is the smallest, and the intermediate amount b is a parameter for opening and closing the intake valve 3 by the cam 33b. The intake amount actually sucked is medium, and the high amount c is a parameter for opening and closing the intake valve 3 by the cam 33c, and the actually sucked intake amount is the largest. Further, the base valve opening amount TA of the intake throttle valve 15 is determined to be zero when the required intake amount Ga is zero, and increases as the required intake amount Ga increases when the required intake amount Ga is in a region very close to zero. It is determined, and when it is in the other region, it is determined to be fully open.

  In normal engine operation control, the base valve closing timing BIT of the intake valve 3, the base valve opening amount BIA of the intake valve 3, and the base valve opening amount of the intake throttle valve 15 determined according to the required intake air amount Ga as described above. BTA is set as it is as the set valve closing timing SIT of the intake valve 3, the set valve opening amount SIA of the intake valve 3, and the set valve opening amount STA of the intake throttle valve 15. Each operation element, that is, the valve closing timing changing mechanism, the valve opening amount changing mechanism, and the intake throttle valve 15 is controlled according to the control parameters thus set.

  In engine operation control after warm-up, correction is performed by adding a correction coefficient K1 to the determined base valve closing timing of the intake valve 3 in order to suppress the occurrence of torque shock when the gear ratio is changed. The closing timing is delayed until the closing timing at which the amount becomes smaller than the intake amount when the intake valve 3 is closed at the determined closing timing, and this is set as the set closing timing SIT of the intake valve 3. To do. This reduces the output engine load when the gear ratio is changed. For this reason, when the transmission ratio of the transmission 60 is changed, it is possible to suppress the occurrence of a so-called torque shock in which the output torque output from the transmission 60 increases rapidly. In the engine operation control after warm-up in this embodiment, control parameters other than the closing timing of the intake valve 3 are not corrected, but the closing timing of the intake valve 3 is used for purposes other than the purpose of reducing the output engine load. Other control parameters may be changed.

  In the cold engine operation control, correction is performed by subtracting the correction coefficient K2 from the determined base valve opening amount BTA of the intake valve 3 in order to suppress the occurrence of torque shock when the gear ratio is changed, This is set as the set valve opening amount STA of the intake throttle valve 15. According to this, since the valve opening amount of the intake throttle valve 15 is reduced, the output engine load is reduced when the gear ratio is changed. For this reason, generation | occurrence | production of the torque shock when the gear ratio of the transmission 60 is changed can be suppressed. When the temperature of the internal combustion engine is low, the temperature of the hydraulic oil is low and its viscosity is high. For this reason, when the temperature of the internal combustion engine is low, a command signal is issued to delay the closing timing of the intake valve 3 in accordance with the engine operation control after warming up, and the hydraulic oil flows as desired even if the hydraulic oil flows. do not do. For this reason, the valve closing timing of the intake valve 3 is not immediately delayed, and therefore the occurrence of torque shock cannot be suppressed. On the other hand, since the operation of the intake throttle valve 15 is electronically controlled, it responds immediately to the command signal even if the temperature of the internal combustion engine is low. For this reason, according to this embodiment, even when the temperature of the internal combustion engine is low, the output engine load can be immediately reduced when the gear ratio is changed, so that the occurrence of torque shock can be satisfactorily suppressed. it can. In the cold engine operation control of the present embodiment, control parameters other than the opening amount of the intake throttle valve 15 are not corrected, but the intake valve 3 is closed for the purpose other than the purpose of reducing the output engine load. Control parameters other than timing may be changed.

  A flowchart for executing the engine operation control including the three controls described above is shown in FIG. First, at step 10, the required engine load L is read, and the required intake air amount Ga is estimated based on the required engine load L. Next, at step 11, the base valve closing timing BIT of the intake valve 3, the base valve opening amount BIA of the intake valve 3, and the base valve opening amount BTA of the intake throttle valve 15 are determined based on the required intake air amount Ga.

  Next, at step 12, it is judged if the gear ratio is being changed. When it is determined in step 12 that the gear ratio is not being changed, normal engine operation is executed. That is, the routine proceeds to step 16 where the base valve closing timing BIT of the intake valve 3 is set as the set valve closing timing SIT, the base valve opening amount BIA of the intake valve 3 is set as the set valve opening amount SIA, and the base of the intake throttle valve 15 is set. The valve opening amount BTA is set as the set valve opening amount STA. Next, the routine proceeds to step 15 where each operation element (the valve closing timing changing mechanism, the valve opening amount changing mechanism, and the intake throttle valve) is controlled according to each operation parameter set at step 16.

  On the other hand, when it is determined in step 12 that the gear ratio is being changed, the routine proceeds to step 13 where the temperature T of the cooling water detected by the water temperature sensor 61 is equal to or higher than a predetermined temperature Tth (T ≧ Tth). ) Is determined. When it is determined in step 13 that T ≧ Tth, engine operation control after warm-up is executed. That is, the routine proceeds to step 14, where the value obtained by adding the correction coefficient K1 to the base valve closing timing BIT of the intake valve 3 is set as the set valve closing timing SIT, and the base valve opening amount BIT of the intake valve 3 is set as the set valve opening amount SIA. Then, the base valve opening amount BTA of the intake throttle valve 15 is set as the set valve opening amount STA. Next, the routine proceeds to step 15 where each operation element is controlled according to each operation parameter set at step 14.

  On the other hand, when it is determined in step 13 that T <Tth, cold engine operation control is executed. That is, the routine proceeds to step 17 where the base valve closing timing BIT of the intake valve 3 is set as the set valve closing timing SIT, the base valve opening amount BIT of the intake valve 3 is set as the set valve opening amount SIA, and the base of the intake throttle valve 15 is set. A value obtained by subtracting the correction coefficient K2 from the valve opening amount BTA is set as the set valve opening amount STA. Next, the routine proceeds to step 15 where each operation element is controlled according to each operation parameter set at step 17.

  In the above-described embodiment, the valve opening amount of the intake throttle valve is selected as an operation parameter to be corrected in the cold engine operation control, but the operation element is related to the output engine load, and its operation is mechanically, Alternatively, the operating parameter of the operating element that is controlled electrically or electronically may be selected. That is, if an operation parameter relating to an operation element other than an operation element whose operation is controlled by hydraulic pressure is corrected, the occurrence of torque shock during the change of the gear ratio can be suppressed.

  In the above-described embodiment, only the closing timing of the intake valve is corrected in the engine operation control after warm-up, and only the opening amount of the intake throttle valve is corrected in the cold engine operation control. Correction may be executed as described above. That is, in the engine operation control after warm-up, the output engine load is reduced by correcting the closing timing of the intake valve and the opening amount of the intake throttle valve, but the output engine load is mainly reduced by correcting the closing timing of the intake valve. Is reduced to the target correction engine load, and the output engine load is made closer to the target correction engine load by auxiliary correction of the valve opening amount of the intake throttle valve, while the intake valve closing is also performed in the cold engine operation control. The output engine load is reduced by correcting the valve timing and the opening amount of the intake throttle valve, but the output engine load is mainly reduced to the target correction engine load by correcting the opening amount of the intake throttle valve. Alternatively, the output engine load may be brought closer to the target correction engine load by correcting the closing timing of the intake valve.

  Of course, the target to be corrected when the gear ratio is changed may be other than the combination of the closing timing of the intake valve and the opening amount of the intake throttle valve. In the engine operation control after warm-up, the target to be corrected is to reduce the output engine load mainly by correcting the closing timing of the intake valve, and to correct other control parameters to adjust the output engine load. In the cold engine operation control, the output engine load is reduced mainly by correcting the control parameters other than the intake valve closing timing, and the correction of the intake valve closing timing is output. What is necessary is just to determine from a viewpoint of using it auxiliaryly for adjustment of an engine load.

1 is an overall view of an internal combustion engine to which an operation control device of the present invention is applied. FIG. 2 is a view showing an intake valve operation characteristic control mechanism of the internal combustion engine shown in FIG. 1. FIG. 3 is a diagram showing in detail an intake valve operation characteristic control mechanism shown in FIG. 2. FIG. 3 is a diagram showing in detail an intake valve operation characteristic control mechanism shown in FIG. 2. It is a figure for demonstrating the setting of each control parameter of this invention. It is a flowchart for performing engine operation control of the present invention.

Explanation of symbols

1 Engine body 3 Intake valve 15 Intake throttle valve

Claims (9)

  A transmission for controlling the transmission ratio, and an intake valve control mechanism for controlling the opening and closing timing and the opening amount of the intake valve, and when the transmission ratio is changed by the transmission, the intake valve In the operation control device for an internal combustion engine in which at least one target value of the on-off valve timing and the valve opening amount is changed by the intake valve control mechanism, the intake valve control mechanism changes the speed ratio by the transmission. An operation control device for an internal combustion engine, characterized in that a shift correction process is performed to correct a change amount of an opening / closing valve timing or an opening amount of an intake valve to be changed according to a state related to the intake valve control mechanism. .   2. The operation control apparatus for an internal combustion engine according to claim 1, wherein the shift correction processing is executed and a control amount of a control mechanism other than the intake valve control mechanism of the internal combustion engine is changed.   A transmission for controlling the gear ratio, and an exhaust valve control mechanism for controlling the opening / closing timing and opening amount of the exhaust valve, and when changing the gear ratio by the transmission, In the operation control device for an internal combustion engine in which at least one target value of the on-off valve timing and the valve opening amount is changed by the exhaust valve control mechanism, the exhaust valve control mechanism changes the speed ratio by the transmission. An operation control device for an internal combustion engine, characterized in that a shift correction process is executed to correct a change amount of an opening / closing valve timing or an opening amount of an exhaust valve to be changed according to a state relating to the exhaust valve control mechanism. .   4. The operation control device for an internal combustion engine according to claim 3, wherein the shift correction processing is executed and a control amount of a control mechanism other than the exhaust valve control mechanism of the internal combustion engine is changed.   A transmission for controlling the transmission, an intake valve control mechanism for controlling the opening / closing valve timing and opening amount of the intake valve, and an exhaust for controlling the opening / closing valve timing and opening amount of the exhaust valve An intake valve opening / closing valve timing and valve opening amount, and an exhaust valve opening / closing valve timing and valve opening amount at least one target value when the transmission gear ratio is changed by the transmission. In an internal combustion engine operation control device that is changed by a control mechanism or an exhaust valve control mechanism, the intake valve opening and closing that is changed by the intake valve control mechanism or the exhaust valve control mechanism when the transmission gear ratio is changed by the transmission When the valve timing or valve opening amount of the intake valve should be changed, the valve timing or valve opening amount or the valve opening or closing valve timing of the exhaust valve should be changed. When the opening / closing valve timing or the valve opening amount of the exhaust valve should be changed according to the state related to the air valve control mechanism, a shift correction process is performed to correct according to the state related to the exhaust valve control mechanism. An operation control device for an internal combustion engine.   6. The operation control of the internal combustion engine according to claim 5, wherein the shift correction processing is executed and a control amount of a control mechanism other than the intake valve control mechanism and the exhaust valve control mechanism of the internal combustion engine is changed. apparatus.   A transmission for shifting and outputting an input speed with a predetermined gear ratio, and an intake valve characteristic changing mechanism for changing the opening / closing timing and opening amount of the intake valve using hydraulic pressure The transmission valve can change the transmission ratio, and the intake valve is configured so that the engine load output from the internal combustion engine is reduced by a predetermined load when the transmission ratio of the transmission is changed. In an operation control device for an internal combustion engine in which the valve timing or valve opening amount is changed by a characteristic changing mechanism, the operation of the operating element related to the value of the engine load output from the internal combustion engine is mechanically or electrically Or an operation change means for changing electronically, and even when the gear ratio of the transmission is changed, the internal combustion engine temperature is lower than a predetermined temperature during a cold engine shift. Is an open / close valve The operation of the internal combustion engine is characterized in that the operation of the operation element is changed so that the engine load output from the internal combustion engine is reduced by the operation change means without performing the imming or the valve opening amount change. Control device.   8. The operation control of the internal combustion engine according to claim 7, wherein the operating element is an intake throttle valve, and the opening degree of the intake throttle valve is reduced by the operation changing means at the time of engine cold shift. apparatus.   9. The operation control apparatus for an internal combustion engine according to claim 8, wherein the transmission changes the transmission ratio between different transmission ratios greater than or equal to a predetermined value.

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