JP2002147319A - Internal combustion engine rotation starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine rotation starting device capable of facilitating the rotation start of an internal combustion engine stopping its rotation. SOLUTION: A crankshaft is rotated to the normal rotation side in the initial stage of the rotation start of the crankshaft by driving a motor generator(M/G), and when the rotation of the crankshaft is stopped by the normal rotation, reverse rotation is carried out by a portion of preset reverse rotation angular width (80 deg.) (S810-S860). Thereby, the pressure in a cylinder is lowered, and the crankshaft can be maximumly reversely rotated until immediately before an intake valve is opened. Accordingly, when the crankshaft is then rotated again to the normal rotation side by the normal rotation drive of the M/G (S880), the pressure in the cylinder is set lower than that in the last time, and inertia torque is set sufficient. Thereby, the purpose can be accomplished and the starting performance of the engine can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine rotation starting device for starting rotation of a crankshaft of an internal combustion engine whose rotation is stopped.

[0002]

2. Description of the Related Art When starting an internal combustion engine, a crankshaft of the internal combustion engine is rotated by driving a rotation output means such as a starter. At this time, in addition to the friction of the internal combustion engine, the compression pressure of the cylinder in the compression stroke particularly acts as a rotational resistance. If the rotational resistance becomes excessive, the rotation of the internal combustion engine stops immediately before the top dead center of the cylinder in the compression stroke, and a start failure may occur. In particular, when the temperature is warm, a large increase in the compression pressure tends to cause poor starting.

[0003] In order to eliminate such a start failure, if the rotation of the internal combustion engine is stopped at the time of start, a technique of executing intermittent or forward / reverse rotation of the torque in the forward direction by the rotation output means (Japanese Patent Application Laid-Open No. Hei 3 (1994)). No. -3969). In this technology, by performing intermittent or forward / reverse rotation of the torque in the forward direction, the pressure in the cylinder is released when the torque is interrupted, the frictional force is changed from static friction to dynamic friction, and the inertia torque is generated. Thus, starting can be facilitated.

[0004] In addition to the above, a technique which is expected to achieve the above-described effects by reversing the internal combustion engine by driving the rotation output means from the beginning of the start and then performing normal rotation (Japanese Patent Laid-Open No. 7-71350). Gazette).

[0005]

However, in the former prior art, only intermittent torque in the forward rotation direction or forward rotation / reverse rotation is performed, and the arrival phase of the crankshaft due to the reverse rotation is not considered. For this reason, the phase of the crankshaft may return too much, causing the intake valve of the cylinder in the compression stroke to open at the start of rotation, and the pressure in the cylinder to reach atmospheric pressure. When the next forward rotation is performed in such a state, the compression pressure is higher than that at the time of the first forward rotation, and the rotation resistance is further increased. Therefore, the possibility of stopping during rotation again increases. If the phase of the crankshaft does not return sufficiently due to the reverse rotation, the effect of the inertia torque by the flywheel or the like when the normal rotation is performed again becomes insufficient. For this reason, even if the pressure in the cylinder is slightly lowered, there is a possibility that the rotation may not be stopped because the rotation resistance at the time of compression cannot be opposed.

[0006] In the latter conventional technique, the reversal is performed from the beginning. However, since the pressure in the cylinder is the atmospheric pressure in the reverse rotation from the beginning, there is no effect of releasing the pressure from the cylinder to the outside. In addition, when switching from the first reverse rotation to the forward rotation, the piston ring rises in the piston ring groove, and the atmospheric pressure is introduced into the cylinder which is lower in pressure than the atmospheric pressure. On the contrary, the pressure in the cylinder is excessively increased. Therefore, the compression pressure is higher than in the case of normal rotation from the beginning, and the rotation resistance is further increased, and the possibility of rotation stop is increased.

In the latter prior art, the reverse rotation angle width is π.
/ 4 (45 °), which is very small. But,
Since the phase of the crankshaft is unknown at the first reverse rotation,
Even with such a small angle width reverse rotation, there is a possibility that the intake valve will open. On the other hand, if the intake valve is not opened, a sufficient inertia torque cannot be obtained by the reverse rotation with such a small angular width, and the rotation may be stopped.

As described above, in both prior arts, there is a high possibility that it becomes difficult to start rotation of the internal combustion engine, and it is hard to say that the startability is sufficiently improved. An object of the present invention is to provide an internal combustion engine rotation start device that can easily start rotation of an internal combustion engine that has stopped rotating.

[0009]

The means for achieving the above object and the effects thereof will be described below. The internal combustion engine rotation start device according to claim 1 is an internal combustion engine rotation start device that starts rotation of a crankshaft of the internal combustion engine by driving a rotation output unit.
Forward rotation driving means for rotating the crankshaft to the normal rotation side by driving the rotation output means; and when the rotation of the crankshaft to the normal rotation side by the normal rotation driving means is stopped, the compression stroke is stopped when the rotation is stopped. Reverse rotation driving means for rotating the crankshaft in the reverse rotation direction until immediately before the intake valve in the cylinder immediately before the dead center opens, and driving of the rotation output means after rotation of the crankshaft to the reverse rotation side by the reverse rotation driving means. And a re-rotation driving means for re-rotating the crankshaft to the forward rotation side.

The forward drive means rotates the crankshaft forward by driving the rotation output means at the beginning of the rotation of the crankshaft. If the rotation is started by the first forward rotation, the rotation can be quickly achieved.

On the other hand, when the rotation of the crankshaft to the forward rotation by the forward rotation driving means is stopped, the reverse rotation driving means opens the intake valve in the cylinder immediately before the top dead center in the compression stroke when the rotation is stopped. Until just before, rotate the crankshaft in the reverse direction. By this reverse rotation, the piston ring can be lifted in the piston ring groove at the start of the reverse rotation, so that the pressure in the cylinder immediately before the top dead center of the compression stroke at the time of stoppage can be released to the outside and reduced.

When the rotation of the crankshaft is stopped by the forward rotation performed by the forward rotation driving means, the stop phase is a phase in which the rotation is stopped due to the rotational resistance due to the compression pressure. Is the phase existing in the state immediately before the top dead center of the compression stroke. Therefore, in the cylinder immediately before the top dead center of the compression stroke, the reverse rotation angle width from this stop phase to just before the intake valve opens is naturally determined.
Therefore, the reverse rotation driving means can perform the reverse rotation until just before the intake valve in the corresponding cylinder is opened by only performing the reverse rotation by the reverse rotation angle width from the stop phase. That is, the crankshaft can be reversed to the maximum extent, and the atmospheric pressure is not introduced from the intake valve to the corresponding cylinder.

[0013] Thus, when the re-forward rotation drive means re-rotates the crankshaft to the forward rotation side by the drive of the rotation output means, the pressure in the corresponding cylinder is again changed to that immediately before the top dead center of the compression stroke. Even now it is lower than last time. In addition, since the rotation is the normal rotation after the reverse rotation until immediately before the intake valve opens, a sufficient inertia torque is generated. Moreover, the frictional force is small because of the dynamic friction.

[0014] This makes it easy to start the rotation of the internal combustion engine that has stopped rotating. In the internal combustion engine rotation start device according to claim 2, in the configuration according to claim 1,
When the rotation of the crankshaft to the normal rotation side by the forward rotation drive unit and the re-forward rotation drive unit is stopped, the reverse rotation drive unit includes an intake valve in a cylinder located immediately before the top dead center of the compression stroke at the time of the stop. The crankshaft is rotated in the reverse direction until immediately before the valve opens.

The reverse rotation driving means is provided not only when the rotation of the crankshaft to the normal rotation side by the normal rotation driving means is stopped but also when the rotation of the crankshaft to the normal rotation side by the re-forward rotation driving means is stopped. Also, at this stop, the crankshaft is rotated in the reverse direction until immediately before the intake valve of the cylinder located immediately before the top dead center of the compression stroke opens.

Thus, even if the rotation cannot be started by the re-rotational driving means, the rotation is reversed again, so that the rotation can be more reliably started by the operation described in claim 1. .

According to a third aspect of the present invention, in addition to the configuration of the second aspect, in addition to the configuration of the second aspect, the rotation of the crankshaft to the reverse rotation side by the reverse rotation driving unit and the rotation of the crankshaft by the re-forward rotation driving unit are controlled. If the rotation of the internal combustion engine does not start after the re-rotation to the normal rotation side is repeated a reference number of times, the crankshaft is driven by the drive of the rotation output means and the drive of the second rotation output means. Rotation output switching means for switching the rotation or rotation of the crankshaft only by driving the second rotation output means to execute the rotation of the internal combustion engine is provided.

After the normal rotation by the normal rotation driving means, the rotation of the crankshaft to the reverse rotation side by the reverse rotation driving means and the re-rotation of the crankshaft to the normal rotation side by the re-forward rotation driving means are used as references. If the rotation of the internal combustion engine does not start even after the number of executions, the rotation output switching means controls the rotation of the crankshaft or the second rotation by the driving of the rotation output means and the driving of the second rotation output means. Is switched to rotation of the crankshaft only by driving the rotation output means. Thus, even if the rotation is stopped by the forward rotation driving unit, the reverse rotation driving unit, and the re-forward rotation driving unit, the rotation of the internal combustion engine can be reliably started.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the rotation output means is a motor generator arranged inside or outside a driving force transmission system from the internal combustion engine to the wheels. The second rotation output means is a starter.

Thus, the forward rotation driving means, the reverse rotation driving means and the re-forward rotation driving means rotate the internal combustion engine by using the motor generator as the rotation output means. In the drive control of the motor generator, when the internal combustion engine does not start rotating, the rotation output switching means switches the rotation to the rotation by the motor generator and the starter as the second rotation output means, or the rotation by only the starter.

Thus, even if the rotation of the internal combustion engine does not start even by driving the motor generator, the rotation of the internal combustion engine can be reliably started.

According to a fifth aspect of the present invention, there is provided an internal combustion engine rotation start device.
In the configuration according to any one of the first to fourth aspects, when the automatic start condition is satisfied after the automatic stop of the internal combustion engine, the internal combustion engine is started for automatic start.

The internal combustion engine rotation start device may be started for automatic start of the internal combustion engine. An automatic start is a start not intended by the driver. Therefore, as described above, the rotation of the internal combustion engine can be easily started, so that the startability can be sufficiently improved, and the driver does not feel uncomfortable at the time of automatic start.

According to a sixth aspect of the present invention, in the internal combustion engine rotation start device according to any one of the first to fifth aspects, the reverse rotation driving means is configured to detect a rotation angle of the crankshaft from which the rotation of the crankshaft to the forward rotation is stopped. By reversing the crankshaft by a predetermined angular width, the crankshaft is rotated in the reverse direction until just before the intake valve of the cylinder located immediately before the top dead center of the compression stroke is opened during the stop. .

As described in the first aspect, in the cylinder immediately before the top dead center of the compression stroke at the time of stop, the stop phase immediately before the top dead center of the compression stroke is in a substantially constant range. The reverse rotation angle width immediately before opening the valve is naturally determined. Therefore, the reverse rotation drive means can perform reverse rotation until just before the intake valve in the corresponding cylinder is opened, simply by performing reverse rotation for a predetermined angle width from the stop phase.

According to a seventh aspect of the present invention, in the internal combustion engine rotation start device according to any one of the first to fifth aspects, the reverse rotation driving means is configured to determine a rotation angle of the crankshaft from which the rotation of the crankshaft to the forward rotation is stopped. By reversing the crankshaft for a predetermined time, the crankshaft is rotated in the reverse direction until just before the intake valve of the cylinder immediately before the top dead center of the compression stroke is opened at the time of the stop.

In addition to directly reversing the crankshaft until immediately before the intake valve is opened by directly detecting the reverse rotation angle width, the reverse rotation of the required angle width is performed depending on the rotation time to the reverse rotation side. Can be.

According to an eighth aspect of the present invention, in the internal combustion engine rotation start device according to any one of the first to seventh aspects, the reverse drive means rotates the crankshaft in the reverse direction by driving the rotation output means. It is characterized by performing.

The rotation of the crankshaft to the reverse rotation side by the reverse rotation driving means is performed by using the torque in the reverse rotation direction due to the compression pressure generated by the normal rotation executed by the normal rotation driving means immediately before the intake of the corresponding cylinder. The rotation may be reversed until immediately before the valve is opened, but the rotation may be performed by driving the rotation output means.

As described above, by positively using the driving force of the rotation output means, it is possible to quickly and reliably reverse the rotation until immediately before the intake valve of the corresponding cylinder opens. Since the rotation is positively reversed by the driving force of the rotation output means, the piston ring can be reliably lifted in the piston ring groove at the start of the reverse rotation, and the pressure in the corresponding cylinder is sufficiently released. Can be.

Further, in the case where the crankshaft performs reverse rotation by the required angular width depending on the rotation time to the reverse rotation side, the reverse rotation speed is stabilized, so that the crankshaft is more accurately phase-positioned. Can be reversed.

[0032]

[First Embodiment] FIG. 1 is a system configuration diagram of an internal combustion engine for a vehicle to which the above-described invention is applied and a control device thereof. Here, a gasoline engine (hereinafter, referred to as “engine”) 2 is used as an internal combustion engine.

The output of the engine 2 is output from the crankshaft 2a of the engine 2 to the output shaft 6a via a torque converter 4 and an automatic transmission (hereinafter referred to as "A / T") 6. Is transmitted to the wheels. Further, separately from such a driving force transmission system from the engine 2 to the wheels, the output of the engine 2 is transmitted to the belt 14 via the pulley 10 connected to the crankshaft 2a. Then, the other pulleys 16 and 18 are rotated by the output transmitted by the belt 14. The pulley 10 is provided with an electromagnetic clutch 10a, which is turned on (connected) and turned off (disconnected) as necessary, and transmits and receives output between the pulley 10 and the crankshaft 2a.
Non-transmission can be switched.

Of the pulleys 16 and 18, the pulley 16 is connected to a rotating shaft of accessories 22, and can be driven by the torque transmitted from the belt 14. Auxiliary equipment 2
2 corresponds to, for example, a compressor for an air conditioner, a power steering pump, a water pump for cooling an engine, and the like. Although one accessory 22 is shown in FIG. 1, one or more of an air conditioner compressor, a power steering pump, an engine cooling water pump, and the like actually exist, and the belt is provided by each having a pulley. 14 to rotate. In the first embodiment, it is assumed that an air conditioner compressor, a power steering pump, and an engine cooling water pump are provided as the auxiliary devices 22.

A motor generator (hereinafter referred to as “M / G”) 26 is linked to the belt 14 by the pulley 18. The M / G 26 functions as a generator as required (hereinafter referred to as a “power generation mode” or a “regenerative mode”), so that the torque transmitted from the crankshaft 2 a via the pulley 18 is converted into electric energy. Convert. Further, the M / G 26 functions as a motor (hereinafter referred to as a “drive mode”) as necessary, so that one or both of the crankshaft 2 a of the engine 2 and the accessories 22 are driven by the belt 14 via the pulley 18. Rotate.

Here, the M / G 26 is electrically connected to the inverter 28. When the M / G 26 is set to the power generation mode or the regenerative mode, the inverter 28 switches from the M / G 26 to the high-voltage power supply (here, 36
V) battery 30 and a low-voltage power supply (12 V) battery 34 via a DC / DC converter 32 to be charged with electric energy, and further to an ignition system, meters, ECUs and others. Switch to power.

When the M / G 26 is set to the “drive mode”, the inverter 28 supplies power to the M / G 26 from the high-voltage power supply battery 30 which is a power source, so that the M / G 2
6 is driven via the pulley 18 and the belt 14 to rotate the auxiliary equipment 22 when the engine is stopped, and to rotate the crankshaft 2a when the vehicle is automatically started, automatically stopped, or started when the engine is stopped. The inverter 28 can adjust the number of revolutions of the M / G 26 by adjusting the supply of electric energy from the high-voltage power supply battery 30.

A starter 36 is provided for starting the engine in a cold state. The starter 36 is supplied with electric power from the low-voltage power supply battery 34, rotates the ring gear, and starts the engine 2.

The A / T 6 is provided with an electric hydraulic pump 38 supplied with electric power from the low-voltage power supply battery 34, and supplies hydraulic oil to a hydraulic control unit inside the A / T 6. This hydraulic oil adjusts the operating state of the clutch, brake and one-way clutch inside the A / T 6 by a control valve in the hydraulic control unit, and switches the shift state as necessary.

The above-described on / off switching of the electromagnetic clutch 10a, mode control of the M / G 26 and the inverter 28,
The control of the starter 36 and the control of the amount of stored power for the batteries 30 and 34 (not shown) are executed by the eco-run ECU 40. Auxiliary equipment 2 excluding water pump
2 drive ON / OFF, drive control of the electric hydraulic pump 38, A
/ T6 shift control, fuel injection control by a fuel injection valve (intake port injection type or in-cylinder injection type) 42, opening degree control of a throttle valve 46 by an electric motor 44, and other engine controls are executed by an engine ECU 48. . In addition, a VSC (Vehicle Stability Control) -ECU 50 is provided.
Automatic control of the brake of each wheel is also performed.

The eco-run ECU 40 detects the number of revolutions of the rotating shaft of the M / G 26 from a revolution number sensor incorporated in the M / G 26, the presence or absence of activation of the eco-run system by the driver from the eco-run switch, and other data. . Further, the engine ECU 48 calculates the engine coolant temperature THW from the water temperature sensor, the presence or absence of depression of the accelerator pedal from the idle switch, the accelerator opening ACCP from the accelerator opening sensor, the steering angle θ from the steering angle sensor,
Vehicle speed sensor to vehicle speed SPD, throttle opening sensor to throttle opening TA, shift position SHFT from shift position sensor, intake top dead center of specific cylinder from cylinder discrimination sensor, engine rotation speed NE from engine speed sensor, cylinder discrimination sensor And an engine speed sensor to detect a crank angle, an air conditioner switch to determine whether an on / off operation is performed, and other data for engine control and the like. Also V
The SC-ECU 50 also detects the presence / absence of depression of the brake pedal from the brake switch and other data for braking control and the like.

Each of these ECUs 40, 48, 50
Is mainly configured by a microcomputer, and a CPU executes necessary arithmetic processing according to a program written in an internal ROM, and executes various controls based on the arithmetic result. These arithmetic processing results and the data detected as described above are stored in the ECUs 40 and 4.
Data communication is possible between 8, 50, and it is possible to exchange data as necessary and execute control in conjunction with each other.

Next, control processing executed by the eco-run ECU 40 will be described. Of the controls described below,
The automatic stop processing and the automatic start processing are executed when the driver turns on the eco-run switch.

The automatic stop processing is shown in the flowchart of FIG. This process is a process repeatedly executed in a short period. Steps in the flowchart corresponding to each processing content are represented by “SＳ”.

When the automatic stop processing is started, first, an operation state for judging execution of the automatic stop is read (S
110). For example, the engine cooling water temperature THW detected from the water temperature sensor, the presence / absence of depression of an accelerator pedal detected from an idle switch, the charged amount of the batteries 30, 34, the presence / absence of depression of a brake pedal detected from a brake switch, and the detection from a vehicle speed sensor. Vehicle speed SP
D and the like are read into the work area of the RAM inside the eco-run ECU 40.

Next, it is determined from these operating states whether or not the automatic stop condition is satisfied (S120). For example,
(1) A state in which the engine 2 has been warmed up and has not been overheated (the engine cooling water temperature THW is lower than the water temperature upper limit,
(2) The state where the accelerator pedal is not depressed (idle switch is on), (3)
A state in which the charged amounts of the batteries 30 and 34 are at required levels, (4) a state in which the brake pedal is depressed (the brake switch is on), and (5) a state in which the vehicle is stopped (the vehicle speed SPD is 0 km / h), it is determined that the automatic stop condition is satisfied when all of the conditions (1) to (5) are satisfied.

If at least one of the above conditions (1) to (5) is not satisfied, the automatic stop condition is not satisfied (S1).
20 ("NO"), the process is once terminated. On the other hand, when the driver stops the vehicle at, for example, an intersection, the automatic stop condition is satisfied ("Y" in S120).
ES "), the running M / G control process is stopped (S13).
0). The running M / G control process is a process that is started by an automatic start process (FIG. 3) described later. Specifically, the running M / G control process is executed during normal running.
/ G26 is set to the power generation mode, and at the time of vehicle deceleration, the M / G 26 is set to the regenerative mode at the time of fuel cut to recover running energy or assist the rotation of the engine 2 immediately after returning from the fuel cut.

Next, engine stop processing is performed (S14).
0). That is, from the eco-run ECU 40 to the engine EC
When the fuel cut instruction is issued to U48, the fuel injection of the fuel injection valve 42 is stopped, and the throttle valve 46 is fully closed. As a result, the combustion in the engine combustion chamber stops, and the operation of the engine 2 stops.

Next, execution of the engine stop M / G drive process is set (S150). M / G when this engine stops
The driving process is a process of controlling the rotation of the crankshaft 2a by the M / G 26 after the operation of the engine 2 is stopped to secure the vibration of the engine 2 and the vehicle and the brake booster pressure. Thus, the present process is temporarily ended.

Next, the automatic start process is shown in the flowchart of FIG. This process is a process repeatedly executed in a short period. When the automatic start process is started, first, an operation state for determining whether to execute automatic start is read (S41).
0). Here, for example, the same as the data read in step S110 of the automatic stop processing (FIG. 2), the engine coolant temperature THW, the state of the idle switch, the battery 3
0, 34, the state of the brake switch and the vehicle speed S
The PD or the like is read into the work area of the RAM.

Next, it is determined from these operating states whether or not the automatic start condition is satisfied (S420). For example,
Under the condition that the engine is stopped by the automatic stop processing, (1) the engine 2 has been warmed up and has not been overheated (the engine cooling water temperature THW is lower than the water temperature upper limit value and (High), (2) the accelerator pedal is not depressed (idle switch is on),
(3) a state in which the charged amounts of the batteries 30 and 34 are at required levels, (4) a state in which a brake pedal is depressed (a brake switch is on), and (5) a state in which the vehicle is stopped (vehicle speed). If any one of the conditions (1) to (5) that the SPD is 0 km / h is not satisfied, it is determined that the automatic start condition is satisfied.

If the engine is not stopped by the automatic stop process, or if all of the above conditions (1) to (5) are satisfied even if the engine is stopped by the automatic stop process, the automatic start condition is not satisfied. (S42
0 and “NO”), the process is once ended.

If any one of the above conditions (1) to (5) is not satisfied in the engine stop state by the automatic stop processing, it is determined that the automatic start condition is satisfied (S420).
"YES"), the M / G drive processing at the time of engine stop described above is stopped (S430). Then, the execution of the M / G drive start / start process described later (FIG. 4) and the running M / G control process described above are set (S440), and the process is temporarily terminated.

Next, the M / G drive start start process is shown in the flowchart of FIG. This processing is started by the execution of step S440, and is repeatedly executed in a short period.

When the M / G drive start start process is started,
First, an instruction to prohibit turning on the air conditioner is issued to the engine ECU 48 (S510). Thus, if the air conditioner is on, the engine ECU 48 stops driving the air conditioner. Therefore, the load generated on the M / G 26 at the time of starting and starting can be reduced.

Next, the electromagnetic clutch 10a is turned on (S520), and the M / G 26 is set in the drive mode (S53).
0). Then, it is determined whether or not the engine rotation has started (S540). At this time, since the M / G 26 has just been set to the drive mode immediately before, the engine 2 is not rotating ("NO" in S540), and then engine rotation start processing is executed (S550).

The details of the engine rotation start process are shown in the flowchart of FIG. When the present process is started, it is first determined whether or not this is the first engine rotation start process at the time of starting the current engine (S610). Since this is the first process ("YES" in S610), mode A is set as the rotational drive mode of M / G 26 (S620).

Then, it is determined whether or not the rotation drive mode is set to mode A (S630). Here, the mode A is initially set as set in step S620.
(“YES” in S630),
The drive of the M / G 26 is controlled so as to rotate forward (S6).
40). Next, it is determined whether or not the reference time Ta has elapsed since the start of the normal rotation drive of the M / G 26 (S650). If the reference time Ta has not elapsed (“N” in S650)
O "), the process is temporarily terminated.

In the next control cycle, it is not the first engine rotation start processing at the time of starting the engine this time.
("NO" in 610), and then the determination in step S630 is made. Here, since the mode is the mode A (“Y” in S630)
ES "), as long as the reference time Ta has not elapsed (" NO "in S650), the normal rotation drive of the M / G 26 (S640) is repeated.

When the reference time Ta has elapsed (S65)
0 and “YES”), it is determined whether or not the engine 2 is currently rotating (S660). Here, the reference time Ta is set to a time sufficient to overcome the resistance due to the compression pressure of the cylinder to which the atmospheric pressure is introduced at the time of the automatic stop, and to determine that the engine 2 is rotating by the M / G 26. ing. Therefore, the rotation of the engine 2 at the time when the reference time Ta has elapsed is determined from the output state of the engine speed sensor, and if there is no output from the engine speed sensor, it is determined that the engine 2 has stopped rotating due to the compression pressure. I can judge. If there is an output from the engine speed sensor, it can be determined that the engine 2 has started to overcome the compression pressure and start rotating.

If the engine is running ("Y" in S660)
ES "), it is determined that engine rotation has started (S670).
Therefore, in the next control cycle, “YES” is determined in step S540 of the M / G drive start start process (FIG. 4), and the processes of steps S560 to S590 are performed as described later.

On the other hand, if the engine is not rotating ("NO" in S660), that is, if the engine 2 is stopped,
Mode B is set as the rotation drive mode (S680).
Therefore, in the next control cycle, “NO” is determined in step S610, and “NO” is determined in S630, and it is next determined whether or not the mode is B (S690). Since the mode is the mode B ("YES" in S690), the reverse rotation / forward rotation processing is executed (S700).

Details of the reverse rotation / forward rotation processing are shown in the flowchart of FIG. When this process is started, it is first determined whether or not the process is the first reverse rotation / forward rotation process at the time of starting the current engine (S810). Since this is the first process (“YES” in S810), the reverse rotation mode is set as the rotation direction mode of the engine 2 (S820). Then, the counter C is cleared (S830).

Next, it is determined whether or not the rotation direction mode is the reverse rotation mode (S840). Since the reverse rotation mode is set at first (“YES” in S840), the M / G 26
Is driven in reverse (S850). As a result, the crankshaft 2a of the engine 2 rotates in the reverse direction. The phase of the crankshaft 2a at the start of the reverse rotation is determined by M / G2 in step S640.
This is because the phase stops without overcoming the resistance of the compression pressure during the forward rotation drive of No. 6. This stop phase exists in a crank angle region of -10 to -20 with respect to the compression stroke top dead center.

Then, from the phase of the start of the reverse rotation, it is determined whether or not the reverse rotation of the angle width of 80 ° has been performed (S8).
60). If the reverse rotation of the 80 ° width has not been performed (“NO” in S860), the present process is temporarily ended as it is. Thereafter, “NO” is determined in step S810, and “YE” is determined in step S840.
S ”, and until M is reversed by 80 °, M
/ G26 reverse drive is continued (S850). In addition,
In the first embodiment, instead of directly detecting the rotational angle width of the crankshaft 2a, the determination is made based on the elapse of a reference time (for example, 150 msec) corresponding to the reverse rotation of the 80 ° width.

Then, the reverse of the 80 ° width, that is, 80 °
When the reference time corresponding to the reverse rotation of the width has elapsed (“YES” in S860), the rotation direction mode is set to the normal rotation mode (S870). Accordingly, in the next control cycle, “NO” in step S810 and “NO” in step S840.
Is determined, and the normal rotation drive of the M / G 26 is executed (S880). Then, it is determined whether or not the reference time Tb has elapsed since the start of the forward rotation drive of the M / G 26 this time (S
890). If the reference time Tb has not elapsed (S89
0 and “NO”), the process is once ended. Thereafter, until the reference time Tb elapses from the start of the forward rotation drive, M / G2
No. 6 normal rotation drive continues (S880). The length of the reference time Tb may be changed according to the value of a counter C described later. For example, the reference time Tb in the forward rotation driving of the M / G 26 at the end (C = 2) in the mode B may be longer than before (C = 0, 1).

When the reference time Tb has elapsed since the start of the normal rotation drive ("YES" in S890), it is determined whether or not the engine 2 is currently rotating (S900). Here, the reference time Tb is set to a time sufficient to overcome the resistance due to the compression pressure of the cylinder after the reverse rotation of the engine 2 and determine that the engine 2 is rotating by the M / G 26. Therefore, the rotation of the engine 2 at the time when the reference time Tb has elapsed is determined from the output state of the engine speed sensor, and if there is no output from the engine speed sensor, it is determined that the engine 2 has stopped rotating due to the compression pressure. I can judge. If there is an output from the engine speed sensor, it can be determined that the engine 2 has started to overcome the compression pressure and start rotating.

If the engine is rotating ("Y" in S900)
ES "), it is determined that engine rotation has started (S910).
Therefore, in the next control cycle, "YES" is determined in step S540 of the M / G drive start start process (FIG. 4), and the processes of steps S560 to S590 are performed as described later.

On the other hand, if the engine is not rotating ("NO" in S900), that is, if the engine 2 is stopped,
The counter C is incremented (S920). Next, it is determined whether or not the counter C is equal to or less than the counter determination value n (S930). The counter determination value n is a value that defines the number of repetitions of the reverse rotation and the forward rotation of the engine 2 by driving the M / G 26. For example, the counter determination value n = 1 to 3 is set. Here, it is assumed that the counter determination value n = 3 in order to specify the number of repetitions of the reverse rotation / forward rotation to be three.

If C <n (“YE in S930”)
S "), the reverse rotation mode is set as the rotation direction mode (S
940). As a result, in the next control cycle, “NO” in step S810 and “YE” in step S840.
S ", and then the reverse rotation drive of the M / G 26 (S850) is started, and the engine 2 is again rotated by 80 ° from the stop phase. When the reverse rotation of the 80 ° width is completed (S86
0, “YES”), and normal rotation is executed again (“NO” in S840 through S870).

When the rotation of the engine is started by the second repetition of the reverse rotation and the normal rotation (“Y” in S900).
ES "), in the next control cycle," YES "is determined in step S540 of the M / G drive start start process (FIG. 4), and the processes of steps S560 to S590 are performed as described later.

On the other hand, if the engine rotation has not started ("NO" in S900), the counter C is incremented (S920), and the counter C becomes the counter determination value n.
It is determined whether or not it is below (S930). Here, since the counter C = 2 and C <n (“YE
S "), the reverse rotation mode is set as the rotation direction mode (S
940). As a result, the third reverse rotation and the normal rotation are repeated.

Then, after the reference rotation time Tb has elapsed for the normal rotation ("YES" in S890), if the engine rotation is started ("YES" in S900), M / G is started in the next control cycle.
In step S540 of the drive start start process (FIG. 4), "Y
ES ”, and step S560 will be described later.
To S590 are performed.

On the other hand, if engine rotation has not started ("NO" in S900), counter C is incremented (S920), and counter C is incremented by counter determination value n.
It is determined whether or not it is below (S930). Here, since the counter C = 3 and C ≧ n (“NO” in S930), the mode C is set to the rotation drive mode (S950). As a result, in the next control cycle,
In the engine rotation start process (FIG. 5), step S6
10, NO is determined in each of S630 and S690, and the engine 2 is rotated forward by driving both the M / G 26 and the starter 36 to start the rotation of the engine 2 (S710). When the starter 36 is driven, M / M is temporarily set in consideration of the engagement with the ring gear.
The G / G 26 may be stopped after the engine speed NE is increased by driving the starter 36 and then increased to, for example, 100 rpm.

Next, it is determined whether or not the engine is rotating (S7).
20), if it has not yet rotated ("N" in S720)
O "), the processing is once ended as it is. On the other hand, if the engine starts rotating ("YES" in S720), it is determined that engine rotation has started (S730). Although not shown, in this case, if the engine 2 does not start rotating even after the elapse of the reference time, it is determined that a failure has occurred.

When the engine 2 starts rotating in this way, it is determined in the next control cycle whether or not engine rotation has started (S5).
In 40), “YES” is determined. And M / G26
Is executed (S560), and the engine speed NE is changed to the idle target speed NEi by the output of the M / G 26.
Control to gradually increase the level to dl, for example, 600 rpm, is started.

Next, after the start of the M / G drive start process, it is determined whether or not the accelerator pedal is still depressed (S570). If the accelerator pedal has not been depressed ("YES" in S570), then the engine speed NE is still less than the idle target speed NEidl.
Is determined (S580). M /
If the engine rotation speed NE has not yet reached the idle target rotation speed NEidl at the beginning of the rotation of G26 (S
("YES" in 580), the process is once terminated as it is.

While repeating step S560, M / G
When the engine speed NE reaches the idle target engine speed NEidl by the output of 26 ("NO" in S580), the eco-run ECU 40 instructs the engine ECU 48 to start fuel injection (S590). As a result, fuel is injected from the fuel injection valve 42, and the engine 2 starts and starts operating.

Further, if the accelerator pedal is depressed before the engine speed NE reaches the idle target speed NEidl ("NO" in S570), the eco-run ECU 40 immediately instructs the engine ECU 48 to start fuel injection. Is performed (S590).

Next, the running M / G control process is shown in the flowchart of FIG. This processing is started by the execution of step S440, and is repeatedly executed in a short period. First, the above-described M / G drive start start process (FIG. 4)
It is determined whether or not the start of the engine 2 has been completed (S1010). If the start is not completed yet ("NO" in S1010), the present process is temporarily terminated as it is.

If the start of the engine 2 is completed by the M / G drive start start process (FIG. 4) ("YES" in S1010), the M / G drive start start process (FIG. 4) is stopped (S1020). .

Then, it is determined whether or not the rotation drive mode is the start in the mode C (S1030). If the engine is started in mode A or mode B ("N" in S1030)
O)), the process proceeds to the next step S1050, but if the start is in the mode C ("YES" in S1030), the starter 36 is stopped (S1040).

Then, an instruction is given to the engine ECU 48 to permit the air conditioner to be turned on in step S510 (S1050). This allows the engine EC
In U48, if the air conditioner switch is on, the air conditioner compressor is switched so as to be linked with the rotation of the pulley 16, and the air conditioner can be driven.

Next, it is determined whether or not the vehicle is being decelerated (S1060). Here, when the vehicle is decelerating, for example, it is determined that the vehicle is decelerating when the accelerator pedal is completely returned during traveling, that is, when the idle switch is on during traveling. Therefore, if the vehicle is not decelerating (idle switch off) ("YES" in S1060), electromagnetic clutch 10a is turned on or is kept on (S1060).
1070), the M / G 26 is set to the power generation mode (S1).
080), and the process is once ended. Thus, during normal traveling, the M / G 26 causes the batteries 30, 34 to be charged by power generation and serves as a power source for various electric systems.

If it is determined that the vehicle is being decelerated ("NO" in S1060), deceleration M / G control processing is executed (S1090). This deceleration M / G control process is a process of setting the M / G 26 to the regenerative mode and recovering the traveling energy of the vehicle as electric energy at the time of fuel cut during deceleration of the vehicle.

An example of the processing according to the first embodiment is shown in the timing chart of FIG. In FIG. 8, at time t
When the automatic start condition is satisfied at 0, mode A is set as the rotation drive mode, the M / G 26 rotates forward, and the crankshaft 2a of the engine 2 starts rotating in the forward direction. However, the engine stops rotating because it cannot rotate against the compression pressure (time t1).

At time t2 after the reference time Ta from the start of normal rotation of the M / G 26, it is determined that the engine rotation has stopped, and the mode B is set. In the mode B, the crankshaft 2a is rotated in the reverse direction by the M / G 26 until the intake valve of the cylinder located immediately before the top dead center of the compression stroke at the time of stoppage is opened (time t3). Next, the crankshaft 2a is rotated forward by the M / G 26 to determine the rotation after the reference time Tb (time t4). Also at this time, if the crankshaft 2a of the engine 2 has stopped rotating, the M / G
26, the second rotation of the crankshaft 2a (from time t4 to time t4).
t5) and normal rotation (time t5 to t6), and determine rotation after the reference time Tb (time t6). At this time, if the rotation of the crankshaft 2a of the engine 2 is stopped, the third reverse rotation (time t6 to t7) and the normal rotation (time t7 to t8) of the crankshaft 2a are further performed, and the reference time is set. The rotation after Tb is determined (time t8). If the crankshaft 2a does not start rotating even after performing the third reverse rotation and normal rotation,
The starter 36 is driven. In the example of FIG. 8, at the initial stage of driving of the starter 36, the M / G 26 is temporarily stopped until the engine speed increases (for example, until it increases to 100 rpm) in order to ensure the engagement between the starter 36 and the ring gear. An example is shown in which a period (time t8 to t9) is provided. As a result, the rotation of the crankshaft 2a reliably starts, and thereafter, the engine 2 is started by fuel injection.

In the configuration of the first embodiment, M
/ G26 is the rotation output means, the starter 36 is the second rotation output means, steps S610 to S640 are the processing as the normal rotation drive means, and steps S650, S660, S6
80, S690, S810, S820, S840 to S8
60, S890, S900, and S940 correspond to the processing as the reverse rotation driving means, steps S870 and S880 correspond to the processing as the forward rotation driving means, and steps S710, S830, and S830.
S920, S930, and S950 correspond to the processing as the rotation output switching means.

According to the first embodiment described above, the following effects can be obtained. (I). At the beginning of the rotation of the crankshaft 2a at the time of automatic start, the crankshaft 2a is rotated to the forward rotation side by driving the M / G 26. If the rotation can be started by the first forward rotation, the rotation can be quickly achieved. But,
When the rotation of the crankshaft 2a to the normal rotation side is stopped, the crankshaft 2a is rotated in the reverse rotation direction by the M / G 26 until the intake valve of the cylinder located immediately before the top dead center of the compression stroke at the time of stoppage is opened. Rotate to. By this reverse rotation, the piston ring can be lifted in the piston ring groove at the start of the reverse rotation, so that the pressure in the cylinder immediately before the top dead center in the compression stroke at the time of stoppage can be reduced.

By the way, in the first forward rotation, the crankshaft 2a
Is stopped, the stop phase is a phase stopped by receiving rotational resistance due to the compression pressure, and indicates that a certain cylinder is in a state immediately before the top dead center of the compression stroke. . This phase exists at −10 ° to −20 ° when the top dead center of the compression stroke is 0 °. Therefore, for this cylinder, the reverse rotation angle width immediately before the intake valve is opened is naturally determined.

For example, when the opening timing of the intake valve is -120
In this case, the intake valve does not open even if the rotation is reversed to just before -120 °. However, in consideration of the reverse rotation of the crankshaft 2a due to the inertial force after the reverse rotation drive is stopped by the M / G 26,
In the first embodiment, the rotation angle width by the reverse drive of the M / G 26 is set to 80 °. As a result, actually, the crankshaft 2a determines the opening timing of the intake valve (-120
Reverse to just before °).

Therefore, the crankshaft 2a can be reversed until just before the intake valve in the corresponding cylinder is opened only by performing the reverse rotation for the reverse rotation angle width (80 °). In other words, the crankshaft 2a can be rotated up to the maximum, and the atmospheric pressure is not introduced from the intake valve to the corresponding cylinder.

Therefore, when the crankshaft 2a is re-rotated forward by the forward rotation of the M / G 26, the pressure in the corresponding cylinder becomes higher than that of the previous time even immediately before the top dead center of the compression stroke. Is also low. In addition, since the rotation is the normal rotation after the reverse rotation until immediately before the intake valve opens, a sufficient inertia torque is generated. Moreover, the frictional force is small because of the dynamic friction. This makes it easier to start the rotation of the stopped engine 2, and improves the startability of the engine 2 during automatic start.

(B). If the rotation of the engine 2 does not start even after the normal rotation again, the reverse rotation and the normal rotation are further repeated. As a result, even if the engine rotation cannot be started by the reverse rotation and re-rotation processing once, the reverse rotation and the normal rotation can be repeated again, and the engine rotation can be more reliably started.

(C). When the engine rotation does not start even after the reverse rotation and the re-forward rotation are performed n times, here, three times, the crankshaft 2a is rotated using the M / G 26 and the starter 36. . Thus, even if the engine 2 does not rotate even if the reverse rotation and the normal rotation are repeated, the rotation of the engine 2 can be reliably started.

(D). The above-described engine rotation start processing (FIGS. 5 and 6) is started when the engine 2 is automatically started. An automatic start is a start not intended by the driver. Therefore, as described above, the rotation of the engine can be easily started and sufficient startability can be achieved, so that the driver does not feel uncomfortable at the time of automatic start.

(E). The rotation of the crankshaft 2a to the reverse rotation side is performed by driving the M / G 26. By positively using the driving force of the M / G 26 at the time of the reverse rotation in this way, it is possible to quickly and reliably reverse the rotation until immediately before the intake valve of the corresponding cylinder opens. Thus, M / G26
, The piston ring can be positively lifted in the piston ring groove at the start of the reverse rotation, and the pressure in the corresponding cylinder can be sufficiently released.

Further, according to the rotation time to the reverse rotation side as in the first embodiment, the angle width (80
When the reverse rotation is determined for (°), the reverse rotation speed is stabilized, so that the crankshaft 2a can be reversely rotated to the correct phase position.

[Other Embodiments] In the first embodiment, in mode C, M / G2
Although both the starter 36 and the starter 36 are driven, the drive of only the starter 36 may be performed.

In the first embodiment, the mode B
Was repeated three times when the engine 2 did not start rotating, but once or two times.
The number of times may be four times or more.

In the first embodiment, M / G2
Although the reverse rotation angle width (80 ° in this case) of No. 6 was determined based on the passage of the reference time corresponding to the reverse rotation angle width, the determination was made by directly detecting that the rotation was reversed by 80 ° from the detected value of the engine speed sensor. You may.

In the first embodiment, the reverse rotation of the crankshaft 2a is performed by driving the M / G 26. In addition, the M / G 26 is stopped, and the reverse rotation of the crankshaft 2a is caused by the forward rotation performed immediately before. The rotation may be reversed until just before the intake valve of the corresponding cylinder is opened using the torque in the reverse direction due to the compressed pressure.

In the first embodiment, M / G2
6 is arranged outside the drive power transmission system from the engine 2 to the wheels, but the engine 2 is rotated by using a motor arranged in the drive power transmission system from the engine 2 to the wheels. The engine may be configured to start, and the engine rotation start processing (FIGS. 5 and 6) of the first embodiment can be applied.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a vehicle internal combustion engine and a control device thereof according to a first embodiment.

FIG. 2 is a flowchart of an automatic stop process executed by an eco-run ECU according to the first embodiment.

FIG. 3 is a flowchart of an automatic start process executed by the eco-run ECU of the first embodiment.

FIG. 4 is a flowchart showing the M / E executed by the eco-run ECU of the first embodiment
9 is a flowchart of a G drive start start process.

FIG. 5 is a flowchart of an engine rotation start process executed by the eco-run ECU of the first embodiment.

FIG. 6 is a flowchart of a reverse rotation / forward rotation process executed by the eco-run ECU of the first embodiment.

FIG. 7 is a flowchart of a running M / G control process executed by the eco-run ECU of the first embodiment.

FIG. 8 is a timing chart showing an example of a process according to the first embodiment.

[Explanation of symbols]

2 engine, 2a crankshaft, 4 torque converter, 6 A / T, 6a output shaft, 10 pulley, 10a
... Electromagnetic clutch, 14 ... Belt, 16, 18 ... Pulley,
22 ... accessories, 26 ... M / G, 28 ... inverter, 30
... Battery for high-voltage power supply, 32 ... DC / DC converter, 34 ... Battery for low-voltage power supply, 36 ... Starter, 38
... Electric hydraulic pump, 40 ... Eco-run ECU, 42 ... Fuel injection valve, 44 ... Electric motor, 46 ... Throttle valve,
48: engine ECU, 50: VSC-ECU.

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 3G092 AA01 AC03 BB10 CA01 CB05 DC03 DE01S DF05 DG08 EA11 EB05 FA30 FA31 GA01 GA10 HA06Z HE05Z HE08Z HF02Z HF04Z HF08Z HF12Z HF21Z HF26Z 3G09 DB15 DB21 DA0519 EA05 EA09 EB08 EC02 FA02 FA11 FA12

Claims (8)

[Claims] 1. An internal combustion engine rotation start device for starting rotation of a crankshaft of an internal combustion engine by driving rotation output means, wherein when the rotation of the crankshaft is started, the rotation of the crankshaft is forwardly driven by driving the rotation output means. Forward rotation driving means for rotating the crankshaft to the forward rotation side by the forward rotation driving means, when the rotation of the crankshaft to the forward rotation is stopped, the intake valve in the cylinder immediately before the top dead center of the compression stroke at the time of the stop is opened. Immediately before the rotation of the crankshaft to the reverse rotation side, and after the rotation of the crankshaft to the reverse rotation side by the reverse rotation drive means, the rotation of the crankshaft to the forward rotation side by the drive of the rotation output means. An internal combustion engine rotation start device comprising: a normal rotation drive unit. 2. The configuration according to claim 1, wherein the reverse rotation driving means is configured to stop the rotation of the crankshaft to the normal rotation side by the normal rotation driving means and the re-forward rotation driving means.
An internal combustion engine rotation start device that rotates the crankshaft in the reverse direction until immediately before the intake valve of a cylinder located immediately before the top dead center of the compression stroke at the time of the stop is opened. 3. In addition to the configuration according to claim 2, the rotation of the crankshaft to the reverse rotation side by the reverse rotation drive means and the re-rotation of the crankshaft to the normal rotation side by the re-forward rotation drive means,
If the rotation of the internal combustion engine does not start after the reference number of times has been repeated, the rotation of the crankshaft or the driving of the second rotation output means by the drive of the rotation output means and the drive of the second rotation output means An internal combustion engine rotation start device comprising: a rotation output switching unit that executes rotation of an internal combustion engine by switching to rotation of a crankshaft only by a crankshaft. 4. The configuration according to claim 3, wherein the rotation output means is a motor generator arranged inside or outside of a driving force transmission system from an internal combustion engine to wheels. An internal combustion engine rotation start device, which is a starter. 5. The internal combustion engine according to claim 1, wherein the internal combustion engine is started for automatic start when an automatic start condition is satisfied after automatic stop of the internal combustion engine. Rotation starter. 6. The configuration according to claim 1, wherein the reverse rotation drive means rotates the crankshaft by a predetermined angular width from a crank angle phase at which rotation of the crankshaft to the forward rotation is stopped. An internal combustion engine rotation start device characterized in that the crankshaft is rotated in the reverse direction until the intake valve in a cylinder located immediately before the top dead center of the compression stroke at the time of the stop is opened by the reverse rotation. 7. The configuration according to claim 1, wherein the reverse rotation driving means reversely rotates the crankshaft for a predetermined time from a crank angle phase at which the rotation of the crankshaft to the forward rotation is stopped. An internal combustion engine rotation start device, wherein the crankshaft is rotated in the reverse direction until immediately before an intake valve of a cylinder located immediately before the top dead center of the compression stroke at the time of the stop is opened. 8. The internal combustion engine according to claim 1, wherein said reverse drive means rotates the crankshaft in the reverse direction by driving said rotation output means. apparatus.