JP6749501B2 - Start control device - Google Patents

Description

The present invention relates to an engine start control device.

When the engine is started and the piston of the engine is in the compression stroke, the piston needs to overcome the compression stroke against the air pressure in the cylinder. In the configuration in which the vehicle generator is used as the engine starting motor, the drive torque of the generator motor may be insufficient to overcome the compression stroke.

So-called swing-back control is known as a technique for improving the startability of such an engine. In the swing-back control of Patent Document 1, the piston is once driven in reverse to a predetermined position (for example, bottom dead center) to lengthen the approach distance to the compression top dead center. With this, when the engine is started, the piston can overcome the compression top dead center by utilizing the inertial force, and the startability of the engine can be improved.

JP, 2010-223135, A

As an alternative to swingback control, it is possible to use a larger generator-motor or a battery with a larger capacity, but both of them are disadvantageous in terms of weight increase.

An object of the present invention is to increase the drive torque of the generator motor while suppressing an increase in weight.

The vehicle control device according to the present invention of claim 1 is
A generator motor (70) that functions as a motor that rotationally drives the crankshaft (51) of the engine (E), and that functions as a generator that generates regenerative electromotive force from the rotation of the crankshaft (51),
Supply means (45) capable of supplying electric power to the generator motor,
It is determined whether the piston of the engine (E) is located in a predetermined region of the compression stroke, if it is determined that the first start control, if it is not located, And a control means (80) for executing the second start control,
The supply means (45) includes a storage means (46) and a capacitor (47),
The first starting control is a control for supplying the charge of the storage means (46) and the capacitor (47) to the supply means (45),
The second start control is a control for supplying the charge of the storage means (46) to the supply means (45),
It is characterized by

The vehicle control device according to the present invention of claim 2 is
The control means (80), when the position of the piston is unknown, determines whether or not the piston is located in the predetermined region after starting the first start control, and is located. If it is determined that there is no, switch to the second start control,
It is characterized by

The vehicle control device according to the present invention of claim 3 is
The supply means (45) includes a switching means (100) for switching the connection state between the storage means (46) and the capacitor (47) between a serial connection mode and a parallel connection mode,
The switching means (100) switches the connection state to the series connection mode when supplying the electric charge of the storage means (46) and the capacitor (47), and supplies the electric charge of the storage means (46). Switching the connection state to the parallel connection mode,
It is characterized by

The vehicle control device according to the present invention of claim 4 is
The control means (80) stores information on the position of the piston when the engine is stopped by idle stop control, and when restarting the engine, positions the piston in the predetermined region based on the information. Determine whether or not
It is characterized by

The vehicle control device according to the present invention of claim 5 is
A sensor (35) for detecting the rotation angle of the generator motor (70) is provided,
The control means (80) determines whether or not the piston is located in the predetermined region based on the detection result of the sensor (35),
It is characterized by

According to the present invention of claim 1, the first start control and the second start control are selectively executed depending on whether or not the position of the piston is in the predetermined region. The first start-up control is executed when the position where a relatively high air pressure acts on the piston is applied, and the electric charge of the storage means and the capacitor is supplied to the generator motor. As a result, the generator motor outputs a larger driving force and the startability of the engine can be improved. By using the capacitor to increase the supply charge, it is possible to increase the driving torque of the generator motor while suppressing the increase in weight. The second starting control is executed when the position where a relatively low air pressure acts on the piston is applied, and the electric charge of the power storage unit is supplied to the generator motor. It is possible to prevent unnecessary consumption of the electric charge charged in the capacitor.

According to the present invention of claim 2, when the position of the piston is unknown, the engine can be started early.

According to the third aspect of the present invention, the charge supply mode can be switched with a relatively simple structure, and the capacitor can be charged by the storage means in the parallel connection mode.

According to the present invention of claim 4, the position determination accuracy of the piston can be improved while eliminating the position detection of the piston when restarting from the idle stop control.

According to the present invention of claim 5, the sensor can be used both for detecting the rotation angle of the generator motor and for detecting the position of the piston.

The side view of the example of the vehicle to which the present invention is applied. Sectional view on the AA line of FIG. The block diagram of the control system of the vehicle of FIG. A circuit diagram of a control circuit of a generator motor, etc. FIG. 5 is an operation explanatory diagram of the control circuit of FIG. 4. FIG. 5 is an operation explanatory diagram of the control circuit of FIG. 4. FIG. 5 is an operation explanatory diagram of the control circuit of FIG. 4. Explanatory drawing which shows the example of position determination of a piston. The flowchart which shows the process example which ECU performs. The flowchart which shows the process example which ECU performs. The circuit diagram showing other examples of composition of a control circuit, such as a generator motor. The circuit diagram showing other examples of composition of a control circuit, such as a generator motor. FIG. 13 is an operation explanatory diagram of the control circuit of FIG. 12. FIG. 13 is an operation explanatory diagram of the control circuit of FIG. 12. FIG. 13 is an operation explanatory diagram of the control circuit of FIG. 12. The circuit diagram showing other examples of composition of a control circuit, such as a generator motor.

FIG. 1 shows a side view of a scooter type motorcycle 1 as an example of a vehicle to which the present invention is applied. The front portion of the vehicle body and the rear portion of the vehicle body are connected via a low floor portion 4. The vehicle body frame is generally composed of a down tube 6 and a main pipe 7. A seat 8 is arranged above the main pipe 7.

The handle 11 is rotatably supported by the head pipe 5 and extends upward. A front fork 12 rotatably rotatably supporting the front wheel WF is attached to one lower side of the handle 11. A handle cover 13 that doubles as an instrument panel is attached to the upper portion of the handle 11. Further, in front of the head pipe 5, an ECU 80 is arranged as a control device of the motorcycle 1.

A bracket 15 is provided so as to project from the rear end of the down tube 6 to the rising portion of the main pipe 7. A hanger bracket 18 of the swing unit 2 is swingably supported by the bracket 15 via a link member 16.

A 4-cycle single-cylinder engine E is arranged at the front of the swing unit 2. A continuously variable transmission 10 is arranged behind the engine E, and a rear wheel WR is pivotally supported on an output shaft of the reduction mechanism 9. The rear shock unit 3 is interposed between the upper end of the speed reduction mechanism 9 and the bent portion of the main pipe 7. Above the swing unit 2, a throttle body 20 and an air cleaner 14 of a fuel injection device connected to an intake pipe 19 extending from the engine E are arranged.

FIG. 2 is a sectional view taken along the line AA of FIG. The swing unit 2 has a right case 75 on the right side in the vehicle width direction and a crank case 74 that is a left case 76 on the left side in the vehicle width direction. The crankshaft 51 is rotatably supported by bearings 53 and 54 fixed to a crankcase 74 . A connecting rod 73 is connected to the crankshaft 51 via a crankpin 52.

The left case 76 also serves as a transmission chamber case, and a belt drive pulley including a movable pulley half body 60 and a fixed pulley half body 61 is attached to the left end of the crankshaft 51. The fixed pulley half 61 is fastened to the left end of the crankshaft 51 by a nut 77. Further, the movable pulley half body 60 is spline-fitted to the crankshaft 51 and is slidable in the axial direction. A V-belt 62 is wound around the two pulley halves 60 and 61.

On the right side of the movable pulley half 60, a ramp plate 57 is fixed to the crankshaft 51. The slide piece 58 attached to the outer peripheral end of the ramp plate 57 is engaged with a ramp plate sliding boss 59 formed in the axial direction at the outer peripheral end of the movable pulley half body 60. Further, on the outer peripheral portion of the ramp plate 57, a tapered surface is formed which is inclined toward the movable pulley half body 60 toward the outer side in the radial direction. A plurality of tapered surfaces are formed between the tapered surface and the movable pulley half body 60. The weight roller 63 is accommodated.

When the rotation speed of the crankshaft 51 increases, the weight roller 63 moves radially outward due to the centrifugal force. As a result, the movable pulley half body 60 moves leftward in the drawing to approach the fixed pulley half body 61, and as a result, the V-belt 62 sandwiched between the pulley half bodies 60, 61 moves radially outward. It moves to increase the winding diameter. A driven pulley (not shown) in which the winding diameter of the V belt 62 is variable is provided on the rear side of the swing unit 2 in correspondence with both pulley halves 60 and 61. The driving force of the engine E is automatically adjusted by the belt transmission mechanism and is transmitted to the rear wheels WR via a centrifugal clutch and a reduction mechanism 9 (see FIG. 1) (not shown).

The generator motor 70 is disposed inside the right case 75. The generator motor 70 functions as a motor that rotationally drives the crankshaft 51 at the time of starting the engine E or assisting acceleration, and also functions as a generator that generates regenerative electromotive force from the rotation of the crankshaft 51 during operation of the engine E.

The generator motor 70 is composed of an outer rotor 71 fixed to the tapered portion of the crankshaft 51 with a mounting bolt 120, and a stator 72 disposed inside the outer rotor 71 and fixed to the right case 75 with a mounting bolt 121. ing. A radiator 68 and a cover member 69 having a plurality of slits are attached to the right side in the drawing of the blower fan 65 fixed to the outer rotor 71 with a mounting bolt 67.

A sprocket 55 is fixed to the crankshaft 51 between the generator motor 70 and the bearing 54. A cam chain that drives a cam shaft (not shown) is wound around the sprocket 55. The sprocket 55 is integrally formed with a gear 56 that transmits power to an oil pump (not shown) that circulates engine oil.

FIG. 3 is a block diagram showing the configuration of the control system of the motorcycle 1. The ECU 80 includes a processor such as a CPU, a storage device such as a ROM and a RAM, and an interface that transmits and receives signals to and from an external device. A switch 30 operated by a rider and various sensors SR are connected to the ECU 80, and based on the detection results thereof, the fuel injection device 40, the ignition device 41, the generator motor 70, the lighting device 42, the display device 43, the relay 44. Etc.

The switch 30 is, for example, a main switch for switching ON/OFF of the main power source of the motorcycle 1, a starter switch for instructing the start of the engine E, an idle stop control permission switch for instructing whether or not idle stop control is permitted, and the like. Is included.

The sensor SR includes a throttle sensor 31 for detecting an accelerator operation of a rider, a crank angle sensor 32 for detecting a rotation angle of the crankshaft 51, a water temperature sensor 33 for detecting a cooling water temperature of the engine E, and a vehicle speed of the motorcycle 1. A vehicle speed sensor 34, a rotation angle sensor 35 for detecting the rotation angle of the generator motor 70, a seating sensor 36 for detecting whether or not the rider is seated on the seat 8, an intake pressure sensor 37 for detecting intake pressure, and the like are included. ..

The motorcycle 1 may execute an idle stop control in which the engine E is temporarily stopped when a predetermined condition is satisfied when the vehicle is stopped such as waiting for a signal. The ECU 80 may determine whether to execute the idle stop control based on the detection results of the idle stop control permission switch and the seating sensor 36. The predetermined condition for starting the idle stop is, for example, that the idle stop control permission switch is on (permitted), the seating sensor 36 detects the rider's seating, and the vehicle speed detected by the vehicle speed sensor 34 is a predetermined value (for example, 5 km. /H) or less, the engine speed detected by the crank angle sensor 32 is a predetermined value (for example, 2000 rpm) or less, and the throttle opening detected by the throttle sensor 31 is a predetermined value (for example, 5 degrees) or less. This is a case where a predetermined time has elapsed in the state of. The restart condition of the engine E after the idle stop is, for example, when the throttle opening is equal to or larger than a predetermined value.

The fuel injection device 40 injects fuel into intake air of the engine E. The ignition device 41 ignites the air-fuel mixture in the engine E. The lighting device 42 is, for example, a headlight. The display 43 is a device such as a meter and various indicators that displays information on the rider. The relay 44 is, for example, a starter relay that is turned on when the engine E is started.

The generator motor 70 and its drive circuit will be described with reference to FIG. In the case of the present embodiment, the generator motor 70 is a three-phase brushless motor generator including a stator around which a three-phase winding is wound. An inverter 90 for driving the generator motor 70 is connected to the generator motor 70. The inverter 90 includes a plurality of bridge-connected switching elements 91a to 91c (collectively referred to as switching element 91) and switching elements 92a to 92c (collectively referred to as switching element 92), and full wave. Configure a rectifying bridge circuit.

In the case of this embodiment, the switching elements 91 and 92 are N-type MOSFETs, and have a drain D, a source S, a gate G, and a parasitic diode Di. The set of the switching element 91a and the switching element 92a is connected in series between the high-side wiring 90a and the low-side wiring 90b to form a leg. The same applies to the set of the switching element 91b and the switching element 92b and the set of the switching element 91c and the switching element 92c, and each constitutes a leg. As described above, the inverter 90 has three sets of legs that are connected in parallel and have the switching element 91 as the high side arm and the switching element 92 as the low side arm, and each connection point between the switching element 91 and the switching element 92. The coil of the corresponding phase of the generator motor 70 is connected to the.

A smoothing capacitor 93 and a switching element 94 connected in series are provided between the wiring 90a and the wiring 90b. In the case of this embodiment, the switching element 94 is a MOSFET like the switching elements 91 and 92. The switching element 94 is turned on, for example, when the generator motor 70 functions as a generator, and the generated voltage is smoothed by the smoothing capacitor 93.

A control signal sent from the ECU 80 is input to each gate G of the switching elements 91, 92 and 94, and ON/OFF control of each of these elements is executed.

The voltage supply circuit 45 is a power supply that supplies electric power to the generator motor 70 via the inverter 90. The voltage supply circuit 45 includes power storage elements 46 and 47 and a switching circuit 100.

The power storage element 46 is the main power source of the motorcycle 1. In the case of this embodiment, the storage element 46 is a lead battery having a nominal voltage of 12V. The storage element 46 supplies electric power to each electric component of the motorcycle 1, such as the generator motor 70, the ECU 80, and the load 81 when functioning as a motor. The load 81 includes electric components of the motorcycle 1, such as the lighting device 42. The positive electrode of the storage element 46 is connected to the wiring 90a of the inverter 90 via the wiring 112b and the relay 110. The negative electrode of the storage element 46 is connected to the ground. The ECU 80 and the load 81 are connected in parallel to the storage element 46 via the fuse 113a, the switch 111, and the fuse 113b. It should be noted that the ECU 80 and the like are provided with a converter or the like that converts and supplies the voltage of the storage element 46. The switch 111 is a main switch operated by the rider, or a relay switch that is turned on/off in conjunction with the main switch. When the engine E is started while the switch 111 is on, the ECU 80 controls the relay 110 to turn on the contact 110b side, and after the engine E is started, turns on the contact 110a side.

The power storage element 47 is an auxiliary power source of the generator motor 70 when it functions as a motor. In the present embodiment, the storage element 47 is a capacitor, and for example, a lithium ion capacitor, a conductive polymer capacitor, an electric double layer capacitor, or the like can be used. The rated voltage of the capacitor is equal to or higher than the nominal voltage of the storage element 46 (here, 12 V).

The switching circuit 100 is a circuit that switches the connection state between the storage elements 46 and 47 and the inverter 90. In the case of this embodiment, the switching circuit 100 includes a plurality of switching elements 101 to 103. In the case of the present embodiment, the switching elements 101 to 103 are MOSFETs like the switching elements 91 and 92.

The switching element 102 and the switching element 103 are connected in series between the wiring 112b and the ground. The negative electrode of the power storage element 47 is connected to the connection point between the switching element 102 and the switching element 103, and the positive electrode is connected to the wiring 112c. Switching element 101 is provided so as to connect and disconnect wiring 112b between power storage element 47 and switching element 102, and its drain D is the positive electrode of power storage element 47 and its source S is the drain of switching element 102 and power storage element 46. Are respectively connected to the positive electrodes of.

By switching ON/OFF of the switching elements 101 to 103, the connection state between the power storage element 46 and the power storage element 47 and the connection state between these and the generator motor 70 (inverter 90) can be roughly divided into two connection modes. You can switch to. A control signal sent from the ECU 80 is input to each gate G of the switching elements 101 to 103, and ON/OFF control of each of these elements is executed. The supply voltage to the generator motor 70 can be switched with a relatively simple circuit configuration.

One of the connection modes is a parallel connection mode. In this connection mode, the storage elements 46 and 47 connected in parallel are connected in parallel to the inverter 90. The generator motor 70 (inverter 90) is supplied with the electric charge of the storage element 46 (in other words, the voltage of the storage element 46). Another one of the connection modes is a serial connection mode. In this connection mode, the storage elements 46 and 47 connected in series are connected in parallel to the inverter 90. The generator motor 70 (inverter 90) is supplied with the charges of the storage elements 46 and 47 (in other words, the sum of the voltage of the storage element 46 and the voltage of the storage element 47).

FIG. 5 shows an example of a parallel connection mode. The switching element 103 is turned on and the switching elements 101 and 102 are turned off. In this connection mode, the charge of the storage element 46, that is, the voltage of the storage element 46 (here, 12 V) can be supplied to the generator motor 70. In the case of this connection mode, the power storage element 47 can be charged by the power storage element 46. Thick line arrows exemplify the flow of current. In the switching element 101, a current flows through the parasitic diode Di. Power storage element 47 is charged to the same potential as power storage element 46. The storage element 47 may have a capacity such that the storage element 46 can be fully charged in several tens of millimeters Sec.

FIG. 6 shows another example of the parallel connection mode. The switching element 101 and the switching element 103 are turned on, and the switching element 102 is turned off. In the case of this connection mode, the generator motor 70 can function as a generator to charge the storage elements 46 and 47, and the thick arrows exemplify the current flow in that case.

FIG. 7 shows an example of a serial connection mode. The switching elements 101 and 103 are turned off, and the switching element 102 is turned on. In the case of this connection mode, the generator motor 70 can be driven by each charge of the storage elements 46 and 47 connected in series, that is, the sum of the voltages, and a large amount of power can be supplied to the generator motor 70. In the case of this embodiment, when the storage element 47 is charged in the parallel connection mode of FIG. 5, the potential of the storage element 47 becomes the same potential as the potential of the storage element 46, and by connecting this in series, the storage element A voltage having a potential difference twice as large as 46 can be supplied to the generator motor 70.

<Detection of piston position and switching of voltage>
In the present embodiment, when the engine E is started, the voltage supplied to the generator motor 70 is switched by determining the position of the piston of the engine E. There is no limitation on the method of detecting the position of the piston, but an example thereof will be described with reference to FIG.

The example of FIG. 8 shows an example in which the position of the piston is determined from the detection results of the intake pressure sensor 37, the crank angle sensor 32, and the rotation angle sensor 35. The number of parts can be reduced by using these sensors also for detecting the position of the piston.

The stroke determination of the engine E can be performed based on the detection result of the intake pressure sensor 37. In the case of the present embodiment, the crank angle sensor 32 is composed of a pulsar rotor provided on the crankshaft 51 and a magnetic sensor for detecting a tooth portion of the pulsar rotor. The pulsar rotor has four short reluctors having a detection width of 22.5 degrees in the circumferential direction and one long reluctor having a detection width of 82.5 degrees in the circumferential direction, which are arranged at intervals of 37.5 degrees. It is shaped.

The rotation angle sensor 35 is a sensor that detects a change in magnetic flux due to the rotation of a permanent magnet provided on a rotor included in the generator motor 70 as a detected body. Here, each of the U phase, the V phase, and the W phase It is composed of three Hall elements corresponding to the phases. The rotation angle sensor 35 is configured to output a pulse signal having a width of 30 degrees for each of the W phase, the U phase, and the V phase at intervals of 30 degrees. Thereby, the rotation angle of the crankshaft 51 can be detected every 10 degrees.

The rotation angle of the crankshaft 51 and the teeth of the pulsar rotor and the rotation angle sensor 35 have a fixed positional relationship as illustrated in FIG. 8, and from the detection results of the crank angle sensor 32 and the rotation angle sensor 35 , the crankshaft 51 The rotation angle can be determined. Furthermore, the stroke of the engine E can be determined from the detection result of the intake pressure sensor 37. Therefore, the position of the piston of the engine E can be determined based on these determination results. In this embodiment, the crank angle is set to 0 degree when the piston position is at compression top dead center. Depending on the sensor configuration, the number of sensors used to determine the piston position can be reduced. For example, when a sensor capable of detecting the absolute angle of the crank angle including the stroke is adopted, the intake pressure sensor 37 and the rotation angle sensor 35 may not be essential for the piston position determination.

When the position of the piston of the engine E is in the compression stroke, the piston needs to overcome the compression stroke against the air pressure in the cylinder of the engine E. In this embodiment, when it is determined that the piston is located in a predetermined region of the compression stroke (a pressure increasing region shown as an example in FIG. 8), the serial connection mode of FIG. 7 is adopted. In the position where a relatively high air pressure acts on the piston, the voltage of the storage element 46 and the charge (the sum voltage) of the storage element 47 are supplied to the generator motor 70. As a result, the generator motor 70 outputs a larger driving force and the startability of the engine E can be improved. By using a capacitor as the storage element 47 for increasing the supply charge, the drive torque of the generator motor 70 can be increased while suppressing the increase in weight.

When it is determined that the piston is not located in the pressure boosting region, the parallel connection mode of FIG. 5 is adopted. In the position where a relatively low air pressure acts on the piston, the electric charge (voltage) of the storage element 46 is supplied to the generator motor 70. Unnecessary consumption of the electric charge charged in the storage element 47 can be prevented.

The pressure boosting region can be set to a range of a predetermined crank angle from the compression top dead center to the compression bottom dead center side. When the compression top dead center is 0 degree as in the example of FIG. 0 to -60 degrees (300 degrees), or 0 to -30 degrees (330 degrees). it can. In the example of FIG. 8, the pressure increase region is in the range of 0 degree to −60 degrees (300 degrees).

In addition, in the case of the present embodiment, the single cylinder engine is illustrated, but the same control can be applied to a multi-cylinder engine, and in that case, the control is performed depending on whether or not one of the piston positions is in the pressure increasing region. Just switch.

<Control example>
An example of starting control of the engine E by the ECU 80 will be described with reference to FIG. FIG. 9 shows an example of processing executed when the main switch of the motorcycle 1 is turned on, and particularly illustrates processing executed when the engine E is started.

In S1, the switching circuit 100 is controlled in the parallel connection mode of FIG. This allows the storage element 47 to be charged by the storage element 46. It is assumed that the storage element 47 is discharged and emptied while the motorcycle 1 is stopped. Therefore, in the present embodiment, first, the storage element 47 is charged.

In S2, it is determined whether the starter switch is turned on. If it is turned on, the process proceeds to S3. In S3, the start control is performed by switching the switching circuit 100 to the serial connection mode of FIG. As a result, it becomes possible to supply more electric power to the generator motor 70.

Here, in the case of the configuration example for detecting the piston position illustrated in FIG. 8, it is necessary to rotate the engine E to some extent and acquire each detection result. Further, when the motorcycle 1 is stopped instead of idle stop, the position of the piston is unknown at the starting stage of the engine E. Therefore, it is necessary to rotate the engine E to some extent by the generator motor 70 in order to determine the position of the piston. At that time, although it is possible to drive the generator motor 70 in the parallel connection mode of FIG. 5, it is difficult to overcome the air pressure and overcome the compression top dead center when the position of the piston is in the pressure increasing region of FIG. There are cases. Therefore, in the present embodiment, the switching circuit 100 is controlled in the series connection mode of FIG. 7 in S3. By such control, the engine E can be started early when the piston position is unknown.

The charge amount of the storage element 47 may be insufficient when the starter switch is turned on. In that case, the parallel connection mode of S1 may be maintained until the charge amount of the power storage element 47 reaches a specified amount. Whether or not the charge amount of the storage element 47 has reached the specified amount may be based on whether or not the elapsed time in the parallel connection mode has reached the specified time, or a sensor that detects the charge amount of the storage element 47 may be used. It may be provided and the detection result of the sensor may be used as a reference.

In S4, the engine E is started while controlling the inverter 90 to drive the generator motor 70 to rotate. Since more electric power is supplied to the generator motor 70, the engine E can be started more smoothly.

In S5, the detection results of the intake pressure sensor 37, the crank angle sensor 32, and the rotation angle sensor 35 are acquired. In S6, it is determined from the detection result obtained in S5 whether the position of the piston is in the pressure increasing region. In S7, as a result of the determination in S6, if the piston position is in the pressure increasing region, the process proceeds to S8, and if it is not in the pressure increasing region, the process proceeds to S9.

In step S8, the start control is performed by switching the switching circuit 100 to the series connection mode of FIG. In S9, the start control is performed by switching the switching circuit 100 to the parallel connection mode of FIG.

In S10, it is determined whether the engine E has been successfully started. Whether or not the engine E has been successfully started can be determined, for example, from the detection result of the crank angle sensor 32. If it is determined that the start is successful, the process proceeds to S11. If it is determined that the engine has not started, the process returns to S5 and the same processing is repeated. By the processes of S8 and S9, the voltage supplied to the generator motor 70 is switched according to the position of the piston.

In S11, the switching circuit 100 is controlled in the parallel connection mode of FIG. The generator motor 70 can function as a generator, and can generate electric power to charge the storage element 46 and supply electric power to the load 81. With the above, one processing is completed.

Next, FIG. 10 illustrates a processing example in the case where the engine E is restarted after the idle stop control. In S21, it is determined whether or not the condition for starting the idle stop is satisfied. An example of this condition is as described above. When it is established, the process proceeds to S22, and when it is not established, one processing is ended.

In S22, the engine E is stopped. In S23, the position of the piston is determined based on the detection results of the intake pressure sensor 37, the crank angle sensor 32, and the rotation angle sensor 35 immediately before the engine E is stopped, and the information indicating the determination result is stored in the memory provided in the ECU 80. ..

In S24, it is determined whether or not the restart condition is satisfied. The restart condition is, for example, brake OFF and accelerator ON. In S25 reads the position information of the piston and stored at S 23. In S26, it is determined whether or not the piston is in the pressure increasing region based on the position information read in S25. When the position of the piston is in the pressure increasing region, the process proceeds to S27, and when it is not in the pressure increasing region, the process proceeds to S28.

In S27, the start control is performed by switching the switching circuit 100 to the serial connection mode of FIG. In S28, the start control is performed by switching the switching circuit 100 to the parallel connection mode of FIG. In S29, the engine E is restarted, and in S30, it is determined whether or not the restart of the engine E is successful. Whether or not the engine E has been restarted successfully can be determined from the detection result of the crank angle sensor 32, for example. When it is determined that the restart is successful, the process proceeds to S31, and when it is determined that the restart has not been performed, the process proceeds to S32.

In S31, the switching circuit 100 is controlled in the parallel connection mode of FIG. The generator motor 70 can function as a generator, and can generate electric power to charge the storage element 46 and supply electric power to the load 81. With the above, one processing is completed.

In S32, the detection results of the intake pressure sensor 37, the crank angle sensor 32, and the rotation angle sensor 35 are acquired. In S33, the position of the piston is determined based on the detection result obtained in S32, the process returns to S26 and the same processing is repeated. By the processes of S27 and S28, the voltage supplied to the generator motor 70 is switched according to the position of the piston.

As described above, in the processing example of FIG. 10, when restarting from the idle stop control, the position information of the piston stored in S23 is first used, so that the position detection accuracy of the piston is improved while the position detection of the piston is unnecessary. it can.

<Other Embodiments>
<Other configuration example 1 of switching circuit>
The smoothing capacitor 93 and the storage element 47 may be used together. As a result, an increase in the number of parts can be suppressed. FIG. 11 is a circuit diagram showing an example thereof. Differences from the circuit of the above embodiment will be described.

The switching circuit 100 in the example of FIG. 11 includes a plurality of switching elements 104 to 107. In this embodiment, the switching elements 104 to 107 are MOSFETs like the switching elements 91 and 92. The switching element 104 is located between and connected to the wiring 90a and the positive electrode of the storage element 47. The drain D of the switching element 104 is connected to the positive electrode of the storage element 47, and the source S is connected to the wiring 90a.

Switching element 105 is provided between the positive electrode of power storage element 46 and the positive electrode of power storage element 47, the source S of which is connected to the positive electrode of power storage element 46 via wiring 90c, and the drain D of which is connected to the positive electrode of power storage element 47. It is connected to the positive electrode.

The switching element 106 is located between and connected to the wiring 90b and the negative electrode of the power storage element 47, and the source S thereof is connected to the wiring 90b and the drain D thereof is connected to the negative electrode of the power storage element 47, respectively. ..

Switching element 107 is provided between the positive electrode of power storage element 46 and the negative electrode of power storage element 47, its drain D is connected to the positive electrode of power storage element 46 via wiring 90c, and its source S is of power storage element 47. It is connected to the negative electrode. A diode 114 is provided between the wiring 90c and the wiring 90a.

By switching ON/OFF of the switching elements 104 to 107, the connection state between the storage elements 46 and 47 and the generator motor 70 (inverter 90) can be switched.

When the circuit is equivalent to the parallel connection mode of FIG. 5, the switching elements 104, 105 and 107 are turned off and the switching element 106 is turned on. When the circuit is equivalent to the parallel connection mode of FIG. 6, the switching elements 105 and 106 are turned on and the switching element 107 is turned off. When the circuit is equivalent to the serial connection mode of FIG. 7, the switching elements 104 and 107 are turned on and the switching elements 105 and 106 are turned off.

<Other configuration example 2 of switching circuit>
In the circuit examples of FIGS. 4 and 11, a high voltage is applied to the switching element 91 forming the high side arm in the serial connection mode, and the voltage of the gate G required to turn it on/off becomes high. The circuit example of FIG. 12 lowers the voltage applied to the switching element 91. Differences from the circuit of FIG. 4 will be described.

The switching circuit 100 includes a plurality of switching elements 201 to 203. In the case of the present embodiment, the switching elements 201 to 203 are MOSFETs like the switching elements 91 and 92. The switching element 201 and the switching element 202 are connected in series between the wiring 112b and the ground. The positive electrode of the power storage element 47 is connected to the connection point between the switching element 201 and the switching element 202, and the negative electrode is connected to the wiring 90b. The switching element 203 is connected to the negative electrode of the power storage element 47 and the ground, the source S is connected to the negative electrode of the power storage element 47, and the drain D is connected to the ground.

By switching ON/OFF of the switching elements 201 to 203 , the connection states of the storage elements 46 and 47 and the inverter 90 can be broadly switched to two connection modes. A control signal sent from the ECU 80 is input to each gate G of the switching elements 201 to 203, and ON/OFF control of each of these elements is executed.

13 to 15 show connection modes corresponding to the connection modes of FIGS. 5 to 7.

FIG. 13 shows an example of a parallel connection mode. The switching element 201 is turned on and the switching elements 202 and 203 are turned off. In this connection mode, the voltage of the storage element 46 (here, 12 V) can be supplied to the generator motor 70. In the case of this connection mode, the power storage element 47 can be charged by the power storage element 46. Thick line arrows exemplify the flow of current. In the switching element 203, a current flows through the parasitic diode Di.

FIG. 14 shows another example of the parallel connection mode. The switching element 201 and the switching element 203 are turned on, and the switching element 202 is turned off. In the case of this connection mode, the generator motor 70 can function as a generator to charge the storage elements 46 and 47, and the thick arrows exemplify the current flow in that case.

FIG. 15 shows an example of a serial connection mode. The switching elements 201 and 203 are turned off, and the switching element 202 is turned on. In the case of this connection mode, the generator motor 70 can be driven by the voltage of the storage elements 46 and 47 connected in series, and a large amount of electric power can be supplied to the generator motor 70. In the case of the present embodiment, when the storage element 47 is charged in the parallel connection mode of FIG. 13, the potential of the storage element 47 becomes the same potential as the potential of the storage element 46, and by connecting this in series, the storage element A voltage having a potential difference twice as large as 46 can be supplied to the generator motor 70.

At this time, since the negative electrode of the power storage element 46 and the positive electrode of the power storage element 47 are connected to the ground, the positive electrode of the power storage element 46 is +12V and the negative electrode of the power storage element 47 is -12V. Therefore, a voltage of -12V to +12V is applied to the generator motor 70 (inverter 90). In the configuration in which a voltage of 0 V to 24 V is applied to the inverter 90 with the same potential difference (24 V), a high voltage is applied to the switching element 91 that constitutes the high side arm, and the voltage of the gate G required to turn it on/off increases. .. Therefore, a dedicated component for obtaining a high gate voltage may be required, and the inverter 90 may have to be newly designed and manufactured. This causes a cost increase.

On the other hand, according to the configuration of the present embodiment, since the voltage of −12V to +12V is applied to the inverter 90, the voltage applied to the switching element 91 of the high side arm can be suppressed to a low level when viewed from the ground potential, and a dedicated component is used. Not required. Therefore, it is possible to switch the power supply amount of the motor generator 70 while suppressing cost increase.

<Other Configuration Example 3 of Switching Circuit>
In the configuration example 2 described with reference to FIGS. 12 to 15, the smoothing capacitor 93 and the storage element 47 may be combined. As a result, an increase in the number of parts can be suppressed. FIG. 16 is a circuit diagram showing an example thereof. Differences from the configuration example 2 will be described.

The switching circuit 100 in the example of FIG. 16 includes a plurality of switching elements 204 to 207. In the case of this embodiment, the switching elements 204 to 207 are MOSFETs. The switching element 204 is located between and connected to the wiring 90a and the positive electrode of the storage element 47. The switching element 206 is located between and connected to the wiring 90b and the negative electrode of the storage element 47. A diode 208 is provided on the wiring 90b.

The switching element 205 is located between and connected to the positive electrode of the storage element 47 and the wiring 90c. The wiring 90c is connected to the ground. The switching element 207 is located between the negative electrode of the storage element 47 and the wiring 90c, and is connected to these. By switching ON/OFF of the switching elements 204 to 207, the connection state between the storage elements 46 and 47 and the inverter 90 can be switched.

When the circuit is equivalent to the parallel connection mode (charging of the power storage element 47 by the power storage element 46) in FIG. 13, the switching element 204 is turned on and the switching elements 205 to 207 are turned off. When the circuit is equivalent to the parallel connection mode (charging of the storage elements 46 and 47 by the generator motor 70) of FIG. 14, the switching elements 204 and 207 are turned on and the switching elements 205 and 206 are turned off. When the circuit is equivalent to the series connection mode of FIG. 15, the switching elements 205 and 206 are turned on and the switching elements 204 and 207 are turned off.

The present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

Claims (5)

A generator motor (70) that functions as a motor that rotationally drives the crankshaft (51) of the engine (E), and that functions as a generator that generates regenerative electromotive force from the rotation of the crankshaft (51),
Supply means (45) capable of supplying electric power to the generator motor,
It is determined whether the piston of the engine (E) is located in a predetermined region of the compression stroke, if it is determined that the first start control, if it is not located, And a control means (80) for executing the second start control,
The supply means (45) includes a storage means (46) and a capacitor (47),
The first starting control is a control for supplying the charge of the storage means (46) and the capacitor (47) to the supply means (45),
The second start control is a control for supplying the charge of the storage means (46) to the supply means (45),
A starting control device characterized by the above. The starting control device according to claim 1, wherein
The control means (80), when the position of the piston is unknown, determines whether or not the piston is located in the predetermined region after starting the first start control, and is located. If it is determined that there is no, switch to the second start control,
A starting control device characterized by the above. The starting control device according to claim 1, wherein
The supply means (45) includes a switching means (100) for switching the connection state between the storage means (46) and the capacitor (47) between a serial connection mode and a parallel connection mode,
The switching means (100) switches the connection state to the series connection mode when supplying the electric charge of the storage means (46) and the capacitor (47), and supplies the electric charge of the storage means (46). Switching the connection state to the parallel connection mode,
A starting control device characterized by the above. The starting control device according to claim 1, wherein
The control means (80) stores information on the position of the piston when the engine is stopped by idle stop control, and when restarting the engine, positions the piston in the predetermined region based on the information. Determine whether or not
A starting control device characterized by the above. The starting control device according to claim 1, wherein
A sensor (35) for detecting the rotation angle of the generator motor (70) is provided,
The control means (80) determines whether or not the piston is located in the predetermined region based on the detection result of the sensor (35),
A starting control device characterized by the above.

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