JP4905427B2 - INTERNAL COMBUSTION ENGINE DEVICE, ITS CONTROL METHOD, AND VEHICLE - Google Patents

Description

  The present invention relates to an internal combustion engine device, a control method therefor, and a vehicle.

Conventionally, as this type of internal combustion engine device, one mounted on a vehicle that raises the intake air amount of the engine when a predetermined fuel cut condition is satisfied has been proposed (for example, see Patent Document 1). In this apparatus, when the predetermined fuel cut condition is satisfied and the catalyst bed temperature is high and the catalyst deterioration suppression control is requested, the engine speed is forcibly reduced by the motor without performing the fuel cut. By controlling the engine within the range of the intake air volume raised from the target air volume when the engine is running independently at the current engine speed so that the explosive fuel can continue, the catalyst of the purifier is exposed to the lean atmosphere. To suppress deterioration.
JP 2007-129881 A

  In an internal combustion engine device that can supply exhaust gas to the intake system by opening an EGR valve provided in a passage connecting the exhaust system and the intake system of the engine, the state of the intake system is changed during the fuel cut. Although it is conceivable to inspect the normal operation of the EGR valve based on the intake pressure when stabilized, such an inspection may not be performed properly. That is, if the intake air volume is increased for reasons such as preventing the engine lubricating oil from entering the combustion chamber during the fuel cut, the intake pressure fluctuates and the intake by the valve operation for inspection is changed. An erroneous determination occurs because the amount of fluctuation in atmospheric pressure cannot be detected correctly, or the amount of fluctuation in intake pressure due to valve operation for inspection becomes smaller because the intake pressure becomes smaller as a negative pressure.

  An internal combustion engine device, a control method therefor, and a vehicle according to the present invention are mainly intended to more properly inspect the normal operation of a valve of an exhaust supply unit when fuel injection to the internal combustion engine is stopped.

  The internal combustion engine apparatus, the control method thereof, and the vehicle of the present invention employ the following means in order to achieve at least the above-described main object.

The internal combustion engine device of the present invention is
An internal combustion engine device comprising an internal combustion engine,
An exhaust supply means having a passage connecting the exhaust system and the intake system of the internal combustion engine and a valve provided in the passage, and supplying the exhaust from the exhaust system to the intake system by opening the valve;
An intake pressure detecting means for detecting an intake pressure which is a pressure of intake air in the intake system;
When a predetermined time elapses while fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, normal operation of the valve of the exhaust supply means is detected by the detected suction. When the execution condition of the valve inspection for inspecting based on the atmospheric pressure is not satisfied, the internal combustion engine and the exhaust gas are set so that the throttle opening degree of the internal combustion engine becomes the first opening degree with the valve of the exhaust gas supply means closed. When the valve inspection execution condition is satisfied, the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening and the valve inspection is executed. Control means for controlling the internal combustion engine and the valve of the exhaust supply means,
It is a summary to provide.

  In this internal combustion engine device of the present invention, when a predetermined time has elapsed since the fuel injection to the internal combustion engine was stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, the valve of the exhaust supply means operates normally. The internal combustion engine and the exhaust supply means so that the throttle opening of the internal combustion engine becomes the first opening degree with the valve of the exhaust supply means closed when the execution condition of the valve inspection for inspecting the engine based on the intake pressure is not satisfied The internal combustion engine so that the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening and the valve inspection is executed when the valve inspection execution condition is satisfied. Control the valve of the exhaust supply means. Therefore, when the valve inspection execution condition is satisfied, the valve inspection is executed in a state where the fuel injection is stopped by reducing the intake pressure, that is, increasing the intake negative pressure, compared to when the valve inspection execution condition is not satisfied. be able to. As a result, when the valve inspection execution condition is satisfied, the amount of change in the intake air pressure due to the valve opening or closing operation of the exhaust supply means becomes larger than when the valve inspection execution condition is not satisfied. The normal operation of the valve of the supply means can be inspected more appropriately.

  In such an internal combustion engine apparatus of the present invention, the control means is configured such that the throttle opening of the internal combustion engine is the second opening degree with the valve of the exhaust supply means closed when fuel injection to the internal combustion engine is stopped. It may be a means for controlling the internal combustion engine and the valve of the exhaust gas supply means so as to have an opening degree. In this way, the intake negative pressure can be made larger before performing control based on whether or not the execution condition of the valve inspection is successful, so that the valve inspection by satisfying the execution condition of the valve inspection can be executed more appropriately. Can do.

  Further, in the internal combustion engine device of the present invention, the control means uses the throttle opening of the internal combustion engine when the internal combustion engine is idling as the second opening, and as the rotational speed of the internal combustion engine increases. It is also possible to control the internal combustion engine using the throttle opening of the internal combustion engine that increases as the first opening.

  Further, in the internal combustion engine apparatus according to the present invention, the control means may reduce the detected intake pressure and the valve in a state in which the valve of the exhaust supply means is closed when the execution condition of the valve inspection is satisfied. The detected intake pressure when the first predetermined time has elapsed after the valve opening operation from the closed state and the second predetermined after the valve closing operation after the first predetermined time has elapsed. Based on the detected intake pressure when time elapses, the valve of the exhaust supply means is controlled so that the valve inspection is performed by determining whether or not the valve of the exhaust supply means operates normally. It can also be a means for controlling. In this way, the valve inspection can be executed more reliably.

  The vehicle of the present invention is the internal combustion engine device of the present invention according to any one of the above-described aspects, that is, basically an internal combustion engine device including the internal combustion engine, and connects an exhaust system and an intake system of the internal combustion engine. An exhaust gas supply means having a passage and a valve provided in the passage, and opening the valve to supply exhaust gas from the exhaust system to the intake system, and detecting an intake pressure that is a pressure of intake air in the intake system When the predetermined time elapses while the fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than the predetermined amount, the valve of the exhaust supply means is normal. When the execution condition of the valve inspection for inspecting the operation based on the detected intake pressure is not satisfied, the throttle opening of the internal combustion engine becomes the first opening with the valve of the exhaust supply means closed. Said Controlling the combustion engine and the valve of the exhaust supply means, and when the execution condition of the valve inspection is satisfied, the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening. An internal combustion engine device comprising: a control means for controlling the internal combustion engine and a valve of the exhaust gas supply means so that the valve inspection is performed; a generator for inputting / outputting power; and a drive shaft connected to an axle; Connected to three shafts of the output shaft of the internal combustion engine and the rotating shaft of the generator, and inputs / outputs power to / from the remaining shafts based on power input / output to / from any two of the three shafts 3 The gist of the invention is to include shaft-type power input / output means, an electric motor for inputting / outputting power to / from the drive shaft, and power storage means for exchanging electric power with the generator and the electric motor.

  Since the vehicle according to the present invention is equipped with the internal combustion engine device according to any one of the above-described aspects, the effect exhibited by the internal combustion engine device according to the present invention, for example, the normal operation of the valve of the exhaust supply means can be more appropriately inspected. The same effects as those that can be achieved can be achieved. In this case, the control means is configured so that when the fuel injection to the internal combustion engine is stopped, the internal combustion engine is motored at a predetermined number of revolutions, and the required braking force required for travel is output to travel. It may be a means for controlling the internal combustion engine, the generator, and the electric motor. Here, the “three-axis power input / output means” can be a single-pinion type or double-pinion type planetary gear mechanism, or can be a differential gear.

The control method of the internal combustion engine device of the present invention includes:
An internal combustion engine, a passage connecting the exhaust system and the intake system of the internal combustion engine, and a valve provided in the passage, and an exhaust supply means for opening the valve and supplying exhaust gas from the exhaust system to the intake system A control method for an internal combustion engine device comprising:
When a predetermined time elapses while fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, normal operation of the valve of the exhaust supply means is sucked into the intake system. When the execution condition of the valve inspection for inspecting based on the intake pressure, which is the air pressure, is not satisfied, the throttle opening of the internal combustion engine becomes the first opening with the valve of the exhaust supply means closed. The internal combustion engine and the valve of the exhaust supply means are controlled, and the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening when the execution condition of the valve inspection is satisfied. And controlling the internal combustion engine and the valve of the exhaust gas supply means so that the valve inspection is performed.
It is characterized by that.

  In this control method for an internal combustion engine device according to the present invention, when a predetermined time elapses after the fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, the valve of the exhaust supply means When the execution condition of the valve inspection for inspecting the normal operation of the engine based on the intake pressure is not satisfied, the throttle opening of the internal combustion engine is set to the first opening with the valve of the exhaust supply means closed. The valve of the exhaust gas supply means is controlled, and when the conditions for executing the valve inspection are satisfied, the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening and the valve inspection is executed. The internal combustion engine and the exhaust supply valve are controlled. Therefore, when the valve inspection execution condition is satisfied, the valve inspection is executed in a state where the fuel injection is stopped by reducing the intake pressure, that is, increasing the intake negative pressure, compared to when the valve inspection execution condition is not satisfied. be able to. As a result, when the valve inspection execution condition is satisfied, the amount of change in the intake air pressure due to the valve opening or closing operation of the exhaust supply means becomes larger than when the valve inspection execution condition is not satisfied. The normal operation of the valve of the supply means can be inspected more appropriately.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with an internal combustion engine device according to an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a three-shaft power distribution / integration mechanism 30 connected to a crankshaft 26 as an output shaft of the engine 22 via a damper 28, and power distribution / integration. A motor MG1 capable of generating electricity connected to the mechanism 30, a reduction gear 35 attached to a ring gear shaft 32a as a drive shaft connected to the power distribution and integration mechanism 30, a motor MG2 connected to the reduction gear 35, And a hybrid electronic control unit 70 for controlling the entire vehicle.

  The engine 22 is configured as an internal combustion engine capable of outputting power using a hydrocarbon-based fuel such as gasoline or light oil, and the air purified by an air cleaner 122 is passed through a throttle valve 124 as shown in FIG. Inhalation and gasoline are injected from the fuel injection valve 126 to mix the sucked air and gasoline, and this mixture is sucked into the combustion chamber through the intake valve 128 and explosively burned by an electric spark from the spark plug 130. Thus, the reciprocating motion of the piston 132 pushed down by the energy is converted into the rotational motion of the crankshaft 26. The exhaust from the engine 22 is purified by having a purification catalyst (three-way catalyst) 134a that purifies harmful components such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) by opening an exhaust valve 129. The air is discharged to the outside air via the device 134 and supplied to the intake side via an EGR (Exhaust Gas Recirculation) system 160. The EGR system 160 includes an EGR pipe 162 that is connected to the rear stage of the purification device 134 and supplies exhaust gas to a surge tank on the intake side, and an EGR valve 164 that is disposed in the EGR pipe 162 and is driven by a stepping motor 163. Then, by adjusting the opening degree of the EGR valve 164, the supply amount of exhaust gas as non-combustion gas is adjusted and supplied to the intake side. In this way, the engine 22 can suck a mixture of air, exhaust, and gasoline into the combustion chamber. Lubricating oil is supplied to a sliding portion such as a bearing between the piston 132 and the cylinder of the engine 22 and the intake / exhaust valves 128 and 129 by an oil pump (not shown) driven by rotation of the crankshaft 26.

  The engine 22 is controlled by an engine electronic control unit (hereinafter referred to as an engine ECU) 24. The engine ECU 24 is configured as a microprocessor centered on the CPU 24a, and includes a ROM 24b that stores a processing program, a RAM 24c that temporarily stores data, an input / output port and a communication port (not shown), in addition to the CPU 24a. . The engine ECU 24 receives signals from various sensors that detect the state of the engine 22, for example, a crank position from the crank position sensor 140 that detects the rotational position of the crankshaft 26, and a water temperature that detects the temperature of cooling water in the engine 22. Cooling water temperature Tw from sensor 142, in-cylinder pressure from a pressure sensor (not shown) installed in the combustion chamber, and a cam that detects the rotational position of a camshaft that opens and closes intake valve 128 and intake valve 129 for intake and exhaust to the combustion chamber A cam position from the position sensor 144; a throttle position from the throttle valve position sensor 146 that detects the position of the throttle valve 124; an intake air amount GA from an air flow meter 148 that is attached to the intake pipe and detects the mass flow rate of the intake air; the same The intake air temperature from the temperature sensor 149 attached to the intake pipe, the intake pressure Pin from the intake pressure sensor 158 that detects the pressure in the intake pipe, the air-fuel ratio from the air-fuel ratio sensor 135a, the oxygen signal from the oxygen sensor 135b, etc. are input. Is entered through the port. The engine ECU 24 also integrates various control signals for driving the engine 22, such as a drive signal to the fuel injection valve 126, a drive signal to the throttle motor 136 that adjusts the position of the throttle valve 124, and an igniter. The control signal to the ignition coil 138, the control signal to the variable valve timing mechanism 150 that can change the opening / closing timing of the intake valve 128, the drive signal to the stepping motor 163 that adjusts the opening of the EGR valve 164, and the like are output. It is output through the port. The engine ECU 24 is in communication with the hybrid electronic control unit 70, controls the operation of the engine 22 by a control signal from the hybrid electronic control unit 70, and outputs data related to the operation state of the engine 22 as necessary. The engine ECU 24 also calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22 based on the crank position from the crank position sensor 140.

  The power distribution and integration mechanism 30 includes an external gear sun gear 31, an internal gear ring gear 32 arranged concentrically with the sun gear 31, a plurality of pinion gears 33 that mesh with the sun gear 31 and mesh with the ring gear 32, A planetary gear mechanism is provided that includes a carrier 34 that holds a plurality of pinion gears 33 so as to rotate and revolve, and that performs differential action using the sun gear 31, the ring gear 32, and the carrier 34 as rotational elements. In the power distribution and integration mechanism 30, the crankshaft 26 of the engine 22 is connected to the carrier 34, the motor MG1 is connected to the sun gear 31, and the reduction gear 35 is connected to the ring gear 32 via the ring gear shaft 32a. When functioning as a generator, power from the engine 22 input from the carrier 34 is distributed according to the gear ratio between the sun gear 31 side and the ring gear 32 side, and when the motor MG1 functions as an electric motor, the engine input from the carrier 34 The power from 22 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side. The power output to the ring gear 32 is finally output from the ring gear shaft 32a to the drive wheels 63a and 63b of the vehicle via the gear mechanism 60 and the differential gear 62.

  The motor MG1 and the motor MG2 are both configured as well-known synchronous generator motors that can be driven as generators and can be driven as motors, and exchange power with the battery 50 via inverters 41 and 42. The power line 54 connecting the inverters 41 and 42 and the battery 50 is configured as a positive electrode bus and a negative electrode bus shared by the inverters 41 and 42, and the electric power generated by one of the motors MG1 and MG2 It can be consumed by a motor. Therefore, battery 50 is charged / discharged by electric power generated from one of motors MG1 and MG2 or insufficient electric power. If the balance of electric power is balanced by the motors MG1 and MG2, the battery 50 is not charged / discharged. The motors MG1 and MG2 are both driven and controlled by a motor electronic control unit (hereinafter referred to as a motor ECU) 40. The motor ECU 40 detects signals necessary for driving and controlling the motors MG1 and MG2, such as signals from rotational position detection sensors 43 and 44 that detect the rotational positions of the rotors of the motors MG1 and MG2, and current sensors (not shown). The phase current applied to the motors MG1 and MG2 to be applied is input, and a switching control signal to the inverters 41 and 42 is output from the motor ECU 40. The motor ECU 40 is in communication with the hybrid electronic control unit 70, controls the driving of the motors MG1 and MG2 by a control signal from the hybrid electronic control unit 70, and, if necessary, data on the operating state of the motors MG1 and MG2. Output to the hybrid electronic control unit 70. The motor ECU 40 also calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on signals from the rotational position detection sensors 43 and 44.

  The battery 50 is managed by a battery electronic control unit (hereinafter referred to as a battery ECU) 52. The battery ECU 52 receives signals necessary for managing the battery 50, for example, a voltage between terminals from a voltage sensor (not shown) installed between terminals of the battery 50, and a power line 54 connected to the output terminal of the battery 50. The charging / discharging current from the attached current sensor (not shown), the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input. Output to the control unit 70. Further, the battery ECU 52 calculates the remaining capacity SOC based on the integrated value of the charge / discharge current detected by the current sensor in order to manage the battery 50, or the battery ECU 52 based on the calculated remaining capacity SOC and the battery temperature Tb. The input / output limits Win and Wout, which are the maximum allowable power that may charge / discharge 50, are calculated. The input / output limits Win and Wout of the battery 50 are set to basic values of the input / output limits Win and Wout based on the battery temperature Tb, and the output limit correction coefficient and the input limit are set based on the remaining capacity SOC of the battery 50. It can be set by setting a correction coefficient and multiplying the basic value of the set input / output limits Win and Wout by the correction coefficient.

  The hybrid electronic control unit 70 is configured as a microprocessor centered on the CPU 72, and in addition to the CPU 72, a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, an input / output port and communication not shown. And a port. The hybrid electronic control unit 70 includes an ignition signal from an ignition switch 80, a shift position SP from a shift position sensor 82 that detects the operation position of the shift lever 81, and an accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83. The accelerator pedal opening Acc from the vehicle, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, and the like are input via the input port. As described above, the hybrid electronic control unit 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via the communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52. ing.

  The hybrid vehicle 20 of the embodiment thus configured calculates the required torque to be output to the ring gear shaft 32a as the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. Then, the operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the required torque is output to the ring gear shaft 32a. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is the power distribution and integration mechanism 30. Torque conversion operation mode for driving and controlling the motor MG1 and the motor MG2 so that the torque is converted by the motor MG1 and the motor MG2 and output to the ring gear shaft 32a, and the required power and the power required for charging and discharging the battery 50. The engine 22 is operated and controlled so that suitable power is output from the engine 22, and all or part of the power output from the engine 22 with charging / discharging of the battery 50 is the power distribution and integration mechanism 30, the motor MG1, and the motor. The required power is converted to the ring gear shaft 32 with torque conversion by MG2. Charge / discharge operation mode in which the motor MG1 and the motor MG2 are driven and controlled to be output to each other, and a motor operation mode in which the operation of the engine 22 is stopped and the power corresponding to the required power from the motor MG2 is output to the ring gear shaft 32a. and so on.

  Next, the operation of the internal combustion engine device mounted on the hybrid vehicle 20 of the embodiment configured as described above, particularly the operation when inspecting the EGR valve 164 when the fuel injection to the engine 22 is stopped will be described. Here, the internal combustion engine device of the embodiment mainly corresponds to the engine 22, the EGR system 160, and the engine ECU 24. FIG. 3 is a flowchart showing an example of a fuel cut time control routine executed by the engine ECU 24, and FIG. 4 is a flowchart showing an example of an EGR valve inspection routine executed by the engine ECU 24. The fuel cut time control routine is repeatedly executed every predetermined time (for example, every several milliseconds) when the fuel injection to the engine 22 is stopped (fuel cut), and the EGR valve inspection routine is the EGR valve check routine in the fuel cut time control routine. It is executed when it is determined that the inspection execution condition is satisfied. In the embodiment, in the fuel cut of the engine 22, the fuel injection control and the ignition control are stopped by the engine ECU 24 that has received the fuel cut instruction signal from the hybrid electronic control unit 70 when the accelerator is turned on from the accelerator on during running. The hybrid electronic control unit 70 transmits a fuel cut instruction signal to the engine ECU 24 when the accelerator is turned off, and the engine 22 is driven by the motor MG1 at the target rotational speed Ne * corresponding to the vehicle speed V. The torque command Tm1 of the motors MG1 and MG2 is applied so that the required braking force according to the vehicle speed V required when the accelerator is off acts on the ring gear shaft 32a as the drive shaft by forcibly rotating and outputting the braking torque from the motor MG2. *, Tm2 * are set and the motor ECU 40 It was assumed that the drive control when the accelerator is off the transmission takes place. The motor ECU 40 that has received the torque commands Tm1 * and Tm2 * of the motors MG1 and MG2 performs switching control of the inverters 41 and 42 so that torque corresponding to the torque commands Tm1 * and Tm2 * is output from the motors MG1 and MG2. . Further, in the embodiment, when the accelerator is turned on during the execution of the fuel cut time control routine or when the execution of the EGR valve inspection routine is finished, the execution of the fuel cut time control routine is stopped. Hereinafter, for convenience of explanation, first, the EGR valve inspection process will be described, and then the fuel cut time control will be described.

  When the EGR valve inspection routine of FIG. 4 is executed, the CPU 24a of the engine ECU 24 first executes a process of inputting the intake pressure Pin from the intake pressure sensor 158 and storing it as a start closing closing intake pressure Psta in a predetermined area of the RAM 24c. (Step S300). Subsequently, the stepping motor 163 is driven so that the opening degree of the EGR valve 164 becomes a predetermined opening degree EBref (for example, an opening degree corresponding to full opening, etc.) (step S310). Waiting for a predetermined time t1 (for example, 1 second or 1.2 seconds) determined by an experiment or the like as a time necessary for the pressure in the intake pipe to stabilize (step S320), the intake pressure sensor The intake pressure Pin is input from 158 and stored in the predetermined area of the RAM 24c as the opening intake pressure Popn (step S330). When the execution of this routine is started, since the EGR valve 164 is fully closed as will be described later, the process of step S310 is a process of opening the opening of the EGR valve 164 from a value 0 to a predetermined opening EBref. Next, the stepping motor 163 is driven so that the EGR valve 164 is fully closed (step S340), and the time required for the pressure in the intake pipe of the engine 22 to stabilize after driving the stepping motor 163 in this way is an experiment or the like. (Step S350), the intake pressure Pin from the intake pressure sensor 158 is input and the process ends in a predetermined area of the RAM 24c. The closed intake pressure Pend is stored (step S360), and a determination value Pdec is calculated by the following equation (1) based on the stored start close intake pressure Psta, open intake pressure Popn, and end close intake pressure Pend. (Step S370). When the calculated determination value Pdec is larger than the threshold value Pref, it is determined that the EGR valve 164 operates normally (step S390), and when the calculated determination value Pdec is equal to or less than the threshold value Pref, it is determined that the EGR valve 164 does not operate normally. Then, the EGR valve inspection routine is finished (step S400). Here, the threshold value Pref is used to determine abnormalities such as open and closed fixing of the EGR valve 164 and failure of the stepping motor 163, and can be obtained in advance through experiments or the like. By such control, normal operation of the EGR valve 164 can be inspected. The EGR valve inspection has been described above.

  Pdec = Popn- (Psta + Pend) / 2 (1)

  Next, fuel cut time control will be described. When the fuel cut time control routine of FIG. 3 is executed, the CPU 24a of the engine ECU 24 first controls the rotational speed Ne of the engine 22, the cooling water temperature Tw from the water temperature sensor 142, the intake air amount GA from the air flow meter 148, and the like. Necessary data is input (step S100), and the process of calculating the rotational speed change amount ΔNe based on the input rotational speed Ne of the engine 22 and calculating the intake air change amount ΔGA based on the intake air amount GA is executed. (Step S110). Here, the rotation speed Ne of the engine 22 is input based on a signal calculated from a signal from the crank position sensor 140. Further, in the embodiment, the engine speed change amount ΔNe of the engine 22 is obtained by subtracting the engine speed Ne (previous Ne) input when the routine was previously executed from the input engine speed Ne. It was determined by dividing by the execution interval t. In the embodiment, the intake air change amount ΔGA of the engine 22 is also obtained by subtracting the intake air amount GA (previous GA) input when the previous routine is executed from the input intake air amount GA. It was determined by dividing by.

  Subsequently, it is determined whether or not a predetermined time t0 has elapsed since the fuel cut of the engine 22, that is, the execution of this routine was first started (step S120), and the predetermined time t0 has elapsed. If not, the stepping motor 163 is driven so that the EGR valve 164 is fully closed, or the state is maintained when the EGR valve 164 is already fully closed (step S130), which is the target value of the throttle opening of the engine 22. A predetermined opening THref used when the engine 22 is idling is set to the target throttle opening TH * (step S140), and the throttle motor 136 is set so that the opening of the throttle valve 124 becomes the set target throttle opening TH *. Driven (step S190), the fuel cut time control routine is terminated. Here, the predetermined time t0 is a time required until it becomes possible to determine the success or failure of the execution condition of the EGR valve inspection described below after the fuel cut is performed, and is based on the characteristics of the engine 22 and the like. Those previously determined by experiments or the like (for example, 1.2 seconds or 1.5 seconds) can be used. In the embodiment, the predetermined opening THref is not illustrated by learning the opening of the throttle valve 124 for idling the engine 22 at a predetermined rotation speed (for example, 1000 rpm, 1200 rpm, etc.) in consideration of changes over time. What was memorize | stored in the non-volatile memory shall be used.

  When the predetermined time t0 has elapsed since the fuel cut of the engine 22 has been performed, whether or not the calculated absolute value of the engine speed change ΔNe has become less than the threshold value Nref (step S150), and execution of the EGR valve inspection It is determined whether or not the condition is satisfied (step S160). Here, the threshold value Nref is for determining a state in which the rotational speed Ne of the engine 22 is stable, and is determined in advance based on experiments or the like based on the characteristics of the engine 22 (for example, several tens of rpm, etc.) ) Can be used. Further, in the embodiment, the execution condition of the EGR valve inspection is that the calculated intake air change amount ΔGA is less than a threshold GAref that can be determined that the intake air amount of the engine 22 is stable. Fluctuates depending on the condition that a predetermined time (for example, 0.8 seconds, 1 second, etc.) for which it can be determined that the amount is stable continues and when the EGR valve 164 is closed from the open state. The condition that a predetermined time (for example, 0.8 seconds, 1 second, etc.) necessary for stabilizing the pressure in the intake pipe to elapse after the EGR valve 164 is fully closed, and the input coolant temperature Tw of the engine 22 are It was assumed that all conditions were satisfied, including a condition that is equal to or higher than a predetermined temperature (for example, 70 ° C. or 75 ° C.) indicating that the engine 22 has been warmed up. As the threshold GAref, the predetermined time, and the predetermined temperature in this execution condition, those determined in advance by experiments or the like based on the characteristics of the engine 22 and stored in the ROM 24b can be used. Therefore, in the embodiment, the predetermined time t0 described above is previously determined based on the time required for driving the throttle valve 124 and the EGR valve 164 after the fuel cut is performed, the predetermined times in the execution conditions of the EGR valve inspection, and the like. It will be determined by experiments.

  When the absolute value of the engine speed change amount ΔNe is equal to or greater than the threshold value Nref or when the EGR valve inspection execution condition is not satisfied even if the absolute value of the engine speed change amount ΔNe is less than the threshold value Nref, It is determined that the EGR valve inspection is not executed, and the raised opening degree ΔTH is set based on the rotational speed Ne of the engine 22 (step S170), and the engine 22 obtained by adding the set raised opening degree ΔTH to the predetermined opening degree THref. The target throttle opening TH * is set (step S180), and the throttle motor 136 is driven so that the opening of the throttle valve 124 becomes the set target throttle opening TH * (step S190), that is, the EGR valve 164. With the valve fully closed, the opening of the throttle valve 124 is raised from a predetermined opening THref to a raised opening ΔT. The control routine at the time of fuel cut is terminated with the state increased by H. In the embodiment, the raised opening degree ΔTH is determined in advance by storing the relationship between the rotational speed Ne of the engine 22 and the raised opening degree ΔTH in the ROM 24b as a raised opening degree setting map, and is given by the rotational speed Ne of the engine 22. Then, the corresponding raised opening degree ΔTH is derived from the stored map and set. FIG. 5 shows an example of the raised opening setting map. In the example of FIG. 5, it is determined that the raised opening degree ΔTH increases as the rotational speed Ne of the engine 22 becomes higher than the predetermined rotational speed during idling described above. This is because when the pressure in the intake pipe is relatively small (when the intake negative pressure is relatively large), the lubricating oil tends to enter the combustion chamber through the cylinder wall of the engine 22 whereas the fuel cut of the engine 22 Since the intake negative pressure tends to increase as the rotational speed Ne increases, the intake air amount increases as the rotational speed Ne increases so that the lubricating oil of the engine 22 is suppressed from being consumed in subsequent combustion or the like. This is based on reasons such as the need to reduce the intake negative pressure.

  On the other hand, when the absolute value of the engine speed change amount ΔNe is equal to or greater than the threshold value Nref and the execution condition for the EGR valve inspection is satisfied, the target throttle opening TH * of the engine 22 is set to a predetermined opening THref. (Step S200), the throttle motor 136 is driven so that the opening of the throttle valve 124 becomes the set target throttle opening TH * (Step S210), and the EGR valve inspection routine of FIG. 4 is executed (Step S220). That is, the EGR valve inspection is executed from the state in which the opening degree of the throttle valve 124 is maintained at the predetermined opening degree THref and the EGR valve 164 is fully closed, and the fuel cut time control routine is ended. By such control, when the execution condition of the EGR valve inspection is satisfied, the target throttle opening TH that is smaller than the target throttle opening TH * when the opening degree of the throttle valve 124 is not satisfied. Therefore, the valve inspection is performed in a state where the fuel injection is stopped by reducing the pressure in the intake pipe of the engine 22, that is, increasing the intake negative pressure, as compared to when the execution condition of the EGR valve inspection is not satisfied. can do. As a result, the amount of fluctuation in the pressure in the intake pipe due to the opening operation and closing operation of the EGR valve 164 in the EGR valve inspection increases, so that erroneous determination is suppressed and the normal operation of the EGR valve 164 can be inspected more appropriately. .

  According to the hybrid vehicle of the embodiment described above, when the predetermined time t0 has elapsed after the fuel cut of the engine 22 has been performed and the absolute value of the engine speed change amount ΔNe is less than the threshold value Nref, the EGR valve When the conditions for executing the inspection are not satisfied, the EGR valve 164 is fully closed and the opening of the throttle valve 124 is increased from the predetermined opening THref by the raised opening ΔTH, whereas the EGR valve inspection is executed. When the condition is satisfied, the EGR valve inspection is executed with the opening degree of the throttle valve 124 set to the predetermined opening degree THref. Therefore, the opening degree of the throttle valve 124 is set more than when the execution condition of the EGR valve inspection is not satisfied. Valve inspection is performed with the intake negative pressure of the engine 22 increased and the fuel injection stopped. The EGR valve inspection based on the intake pressure Pin from the intake pressure sensor 158 can be executed more appropriately. Further, when the fuel cut of the engine 22 is performed, the EGR valve 164 is fully closed and the opening of the throttle valve 124 is set to a predetermined opening THref, thereby performing control based on whether or not the execution condition of the EGR valve inspection is satisfied. Since it is possible to make the intake negative pressure larger before, the EGR valve inspection based on the intake pressure Pin based on the establishment of the execution condition can be executed more appropriately. Further, when the execution condition for the EGR valve inspection is not satisfied, the opening degree of the throttle valve 124 is increased by the raised opening degree ΔTH that becomes larger as the rotational speed Ne of the engine 22 becomes higher than the predetermined opening degree THref. The lubricating oil can be prevented from entering the combustion chamber, and consumption of the lubricating oil can be suppressed. In addition, since the intake air amount of the engine 22 is raised above the amount corresponding to the predetermined opening THref and the pressure in the intake pipe does not fluctuate during the EGR valve inspection, the erroneous determination is suppressed, The EGR valve inspection based on the intake pressure Pin can be executed more appropriately. Moreover, when the fuel cut of the engine 22 is performed by turning off the accelerator, the engine 22 is motored by the motor MG1 at the target rotational speed Ne * and the braking torque is output from the motor MG2 so that the engine 22 travels with the required braking force. 22 and motors MG1 and MG2 are controlled, so that the intake negative pressure can be easily increased by the motoring of the engine 22, and the EGR valve inspection is executed while the vehicle continues running without stopping the vehicle. be able to.

  In the hybrid vehicle 20 of the embodiment, when the fuel cut of the engine 22 is performed, the predetermined opening THref is set as the target throttle opening TH *, and after a predetermined time t0 has elapsed since the fuel cut was performed, EGR Depending on the success or failure of the valve inspection execution condition, the predetermined opening THref plus the raised opening ΔTH or the predetermined opening THref is set as the target throttle opening TH *, but the fuel of the engine 22 is cut. When the predetermined opening THref is added to the raised opening ΔTH, the target throttle opening TH * is set as the target throttle opening TH *, and after the predetermined time t0 has elapsed since the fuel cut was performed, Depending on success or failure, the predetermined opening THref plus the raised opening ΔTH or the predetermined opening THref is set to the target throttle. It may be set as Le opening TH *.

  In the hybrid vehicle 20 of the embodiment, when the execution condition of the EGR valve inspection is not satisfied, a raised opening degree ΔTH based on the rotation speed Ne of the engine 22 is added to a predetermined opening degree THref used when the engine 22 is idling. Is set as the target throttle opening TH * and the predetermined opening THref is set as the target throttle opening TH * when the EGR valve inspection execution condition is satisfied, but the EGR valve inspection execution condition is satisfied. If the opening condition is smaller than the target throttle opening degree TH * when the execution condition is not satisfied, the target throttle opening degree TH * may be set. For example, the execution condition of the EGR valve inspection is satisfied. When the engine is not open, the opening degree that can most suppress the consumption of the lubricating oil of the engine 22 is predicted. The first predetermined opening determined by experiment or the like is set to the target throttle opening TH *, and when the execution condition for the EGR valve inspection is satisfied, the first predetermined opening is smaller than the first predetermined opening and slightly larger than the predetermined opening THref. The second predetermined opening may be set to the target throttle opening TH *.

  In the hybrid vehicle 20 of the embodiment, when the absolute value of the engine speed change amount ΔNe is equal to or greater than the threshold value Nref when a predetermined time t0 has elapsed since the fuel cut of the engine 22 has been performed, the hybrid vehicle 20 is raised to the predetermined opening THref. Although the value obtained by adding the opening degree ΔTH is set as the target throttle opening degree TH *, the predetermined opening degree THref may be set as the target throttle opening degree TH *.

  In the hybrid vehicle 20 of the embodiment, it is determined whether or not a predetermined time t0 has elapsed from when the fuel cut of the engine 22 is performed until it becomes possible to determine whether the execution condition of the EGR valve inspection is successful. Although the subsequent processing is executed, the characteristic of the engine 22 is defined as the time required for the pressure in the intake pipe to stabilize to such an extent that the intake air amount of the engine 22 can be raised from the amount corresponding to the predetermined opening THref. Based on the above, it is determined whether or not a predetermined time (for example, 0.8 seconds or 1 second) determined in advance by an experiment or the like has elapsed since the fuel cut of the engine 22 has been performed, and the subsequent processing is executed. It may be a thing.

  In the hybrid vehicle 20 of the embodiment, the start-close intake pressure Psta and the EGR valve 164 that are the intake pressure Pin from the intake pressure sensor 158 when the EGR valve 164 is fully closed when the execution of the EGR valve inspection is started. The stepping motor 163 is fully closed so that the opening-time intake pressure Popn and the EGR valve 164 are fully closed when the predetermined time t1 has passed after the stepping motor 163 is driven so that the opening degree of the opening EBref becomes the predetermined opening degree EBref. It is determined whether or not the EGR valve 164 normally operates based on the intake air pressure Pin at the end closing time, which is the intake air pressure Pin when a predetermined time t2 has elapsed since the drive of the engine. As long as the EGR valve inspection is executed based on the intake pressure Pin from 158, for example, the intake air at the time of opening It is determined whether the EGR valve 164 operates normally by using only the Popn and the start / close intake pressure Psta based on whether the difference is greater than or less than the threshold value, or the open intake pressure Popn and the end close intake pressure. Whether or not the EGR valve 164 operates normally may be determined based on whether these differences are equal to or greater than a threshold value or less than the threshold value using only the atmospheric pressure Pend.

  In the hybrid vehicle 20 of the embodiment, the power of the motor MG2 is shifted by the reduction gear 35 and output to the ring gear shaft 32a. However, as illustrated in the hybrid vehicle 120 of the modified example of FIG. May be output to an axle (an axle connected to the wheels 64a and 64b in FIG. 6) different from an axle to which the ring gear shaft 32a is connected (an axle to which the drive wheels 63a and 63b are connected).

  In the embodiment, the hybrid vehicle that travels using the power from the engine and the power from the motor has been described. However, the present invention may be applied to a vehicle that travels using only the power from the engine.

  In addition, if an internal combustion engine device mainly including the engine 22, the EGR system 160, and the engine ECU 24 is provided, the same control as in the embodiment can be performed, so that a moving body such as an automobile, a vehicle, a ship, an aircraft, etc. It is good also as a form of the internal-combustion engine apparatus mounted in the thing of the form of the internal-combustion engine apparatus mounted in, or a construction machine etc. which does not move. Moreover, it is good also as a form of the control method of such an internal combustion engine apparatus.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 22 corresponds to an “internal combustion engine”, the EGR system 160 corresponds to an “exhaust supply unit”, the intake pressure sensor 158 corresponds to an “intake pressure detection unit”, and the fuel of the engine 22 is cut. When the predetermined time t0 has elapsed and the absolute value of the rotational speed change amount ΔNe is less than the threshold value Nref and the EGR valve inspection execution condition is not satisfied, the throttle valve 124 is closed with the EGR valve 164 fully closed. When the opening degree is increased from the predetermined opening degree THref by the raised opening degree ΔTH and the execution condition for the EGR valve inspection is satisfied, the EGR valve inspection is executed with the opening degree of the throttle valve 124 set to the predetermined opening degree THref. The engine ECU 24 that executes the fuel cut time control routine of FIG. 3 and the EGR valve inspection routine of FIG. It corresponds to “control means”. Further, the motor MG1 corresponds to a “generator”, the power distribution and integration mechanism 30 corresponds to a “triaxial power input / output unit”, the motor MG2 corresponds to a “motor”, and the battery 50 serves as a “power storage unit”. Equivalent to.

  Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon fuel such as gasoline or light oil, and may be any type of internal combustion engine such as a hydrogen engine. The “exhaust supply means” is not limited to the EGR system 160, and has a passage connecting the exhaust system and the intake system of the internal combustion engine and a valve provided in the passage, and opens the valve from the exhaust system. Any device may be used as long as it supplies exhaust gas to the intake system. The “intake pressure detecting means” is not limited to the intake pressure sensor 158, and any means may be used as long as it detects the intake pressure that is the pressure of the intake air in the intake system. The “control unit” is not limited to a single electronic control unit, and may be configured by a plurality of electronic control units. Further, the “control means” satisfies the execution condition of the EGR valve inspection when the predetermined time t0 has elapsed after the fuel cut of the engine 22 is performed and the absolute value of the rotational speed change amount ΔNe is less than the threshold value Nref. When the EGR valve 164 is fully closed, the opening of the throttle valve 124 is increased from the predetermined opening THref by the raised opening ΔTH, and when the EGR valve inspection execution condition is satisfied, the throttle valve 124 is opened. It is not limited to performing the EGR valve inspection in a state where the degree is set to a predetermined opening THref, and a change in the rotational speed of the internal combustion engine with a lapse of a predetermined time in a state where fuel injection to the internal combustion engine is stopped. Valve inspection to inspect normal operation of the valve of the exhaust supply means based on the detected intake pressure when the amount is less than the predetermined amount When the execution condition is not satisfied, the internal combustion engine and the exhaust supply means valve are controlled so that the throttle opening degree of the internal combustion engine becomes the first opening degree while the exhaust supply means valve is closed. When the execution condition is satisfied, the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening and the valve of the internal combustion engine and the exhaust supply means is controlled so that the valve inspection is executed Anything can be used. The “generator” is not limited to the motor MG1 configured as a synchronous generator motor, and may be any type of generator as long as it can input and output power, such as an induction motor. The “three-axis power input / output means” is not limited to the power distribution / integration mechanism 30 described above, but includes four or more shafts using a double pinion type planetary gear mechanism or a combination of a plurality of planetary gear mechanisms. Connected to the three axles of the drive shaft connected to the axle, the output shaft of the internal combustion engine, and the rotating shaft of the generator, such as those connected to the shaft and those having a differential action different from the planetary gear such as a differential gear As long as the power is input / output to / from the remaining shafts based on the power input / output to / from any two of the three axes, any configuration may be used. The “motor” is not limited to the motor MG2 configured as a synchronous generator motor, and may be any type of motor such as an induction motor that inputs and outputs power to the drive shaft. The “storage means” is not limited to the battery 50 as a secondary battery, and may be anything as long as it exchanges power with a generator and an electric motor such as a capacitor.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention is applicable to an internal combustion engine device, a vehicle manufacturing industry, and the like.

1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with an internal combustion engine device according to an embodiment of the present invention. 2 is a configuration diagram showing an outline of the configuration of an engine 22. FIG. It is a flowchart which shows an example of the control routine at the time of a fuel cut performed by engine ECU24 of an Example. It is a flowchart which shows an example of the EGR valve test | inspection routine performed by engine ECU24 of an Example. It is explanatory drawing which shows an example of the map for raising opening degree setting. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification.

Explanation of symbols

  20 hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 24a CPU, 24b ROM, 24c RAM, 26 crankshaft, 28 damper, 30 power distribution and integration mechanism, 31 sun gear, 32 ring gear, 32a ring gear shaft, 33 pinion gear, 34 carrier, 35 reduction gear, 40 motor electronic control unit (motor ECU), 41, 42 inverter, 43, 44 rotational position detection sensor, 50 battery, 51 temperature sensor, 52 battery electronic control unit (battery ECU) ), 54 power line, 60 gear mechanism, 62 differential gear, 63a, 63b driving wheel, 64a, 64b wheel, 70 electronic control unit for hybrid, 72 CPU, 74 ROM, 76 RA , 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, 122 air cleaner, 124 throttle valve, 126 fuel injection valve, 128 intake valve, 129 exhaust valve, 130 spark plug, 132 piston, 134 purification device, 135a air-fuel ratio sensor, 135b oxygen sensor, 136, throttle motor, 138 ignition coil, 140 crank position sensor, 142 water temperature sensor, 143 pressure sensor, 144 Cam position sensor, 146 Throttle valve position sensor, 148 Air flow meter, 149 Temperature sensor, 15 Variable valve timing mechanism, 158 suction pressure sensor, 160 EGR system, 162 EGR pipe, 163 a stepping motor, 164 EGR valve, MG1, MG2 motor.

Claims (6)

An internal combustion engine device comprising an internal combustion engine,
An exhaust supply means having a passage connecting the exhaust system and the intake system of the internal combustion engine and a valve provided in the passage, and supplying the exhaust from the exhaust system to the intake system by opening the valve;
An intake pressure detecting means for detecting an intake pressure which is a pressure of intake air in the intake system;
When a predetermined time elapses while fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, normal operation of the valve of the exhaust supply means is detected by the detected suction. When the execution condition of the valve inspection for inspecting based on the atmospheric pressure is not satisfied, the internal combustion engine and the exhaust gas are set so that the throttle opening degree of the internal combustion engine becomes the first opening degree with the valve of the exhaust gas supply means closed. When the valve inspection execution condition is satisfied, the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening and the valve inspection is executed. Control means for controlling the internal combustion engine and the valve of the exhaust supply means,
An internal combustion engine device comprising:   The control means is configured to cause the throttle opening of the internal combustion engine to become the second opening with the valve of the exhaust supply means closed when fuel injection to the internal combustion engine is stopped. 2. The internal combustion engine device according to claim 1, which is a means for controlling a valve of the exhaust gas supply means.   The control means uses the throttle opening of the internal combustion engine when the internal combustion engine is idling as the second opening, and sets the throttle opening of the internal combustion engine that increases as the rotational speed of the internal combustion engine increases. The internal combustion engine device according to claim 1, wherein the internal combustion engine device is means for controlling the internal combustion engine using the first opening.   When the execution condition of the valve inspection is established, the control means detects the detected intake pressure when the valve of the exhaust supply means is closed and the opening operation of the valve from the closed state. The detected intake pressure when the first predetermined time has elapsed later and the detected intake pressure when the second predetermined time has elapsed after the closing operation of the valve after the first predetermined time has elapsed 4. The means for controlling the valve of the exhaust supply means so that the valve inspection is executed by determining whether or not the valve of the exhaust supply means operates normally based on the intake pressure. An internal combustion engine device according to any one of the preceding claims. An internal combustion engine device according to any one of claims 1 to 4,
A generator that inputs and outputs power;
It is connected to three shafts, that is, a drive shaft coupled to an axle, an output shaft of the internal combustion engine, and a rotating shaft of the generator, and the remaining power is determined based on power input / output to / from any two of the three shafts. 3-axis power input / output means for inputting / outputting power to the shaft;
An electric motor for inputting and outputting power to the drive shaft;
Power storage means for exchanging power with the generator and the motor;
A vehicle comprising: An internal combustion engine, a passage connecting the exhaust system and the intake system of the internal combustion engine, and a valve provided in the passage, and an exhaust supply means for opening the valve and supplying exhaust gas from the exhaust system to the intake system A control method for an internal combustion engine device comprising:
When a predetermined time elapses while fuel injection to the internal combustion engine is stopped and the amount of change in the rotational speed of the internal combustion engine is less than a predetermined amount, normal operation of the valve of the exhaust supply means is sucked into the intake system. When the execution condition of the valve inspection for inspecting based on the intake pressure, which is the air pressure, is not satisfied, the throttle opening of the internal combustion engine becomes the first opening with the valve of the exhaust supply means closed. The internal combustion engine and the valve of the exhaust supply means are controlled, and the throttle opening of the internal combustion engine becomes a second opening smaller than the first opening when the execution condition of the valve inspection is satisfied. And controlling the internal combustion engine and the valve of the exhaust gas supply means so that the valve inspection is performed.
A control method for an internal combustion engine device.

Images