JPS5912156A - "idle stop" controlling apparatus - Google Patents

Abstract

PURPOSE:To facilitate restarting of an engine, by driving a fly-wheel by a motor in case that the speed of rotation of the fly-wheel is lower than a prescribed value, in an apparatus utilizing the driving power accumulated in the fly-wheel at the time of restarting the engine after stopping of idling operation. CONSTITUTION:In the titled apparatus of this invention, a clutch 27 is brought into engagement with a starting fly-wheel 24 at the time of accelerating an engine or constant-speed operation of the engine by supplying current to an electromagnetic coil 12 for turning the fly-wheel 24 together with the clutch 27, so as to utilize the driving power accumulated in the fly-wheel 24 for the restarting of the engine after stopping of its idling operation. Here, in case that the speed of rotation of the fly-wheel 24 at the time of starting the engine is lower than a first reference value, the electromagnetic coil 12 is de-energized and the fly-wheel 24 is driven by a motor (not shown) until the speed of rotation of the fly-wheel 24 reaches a second reference value. When the speed of rotation of the fly-wheel 24 is raised to the second reference value, the electromagnetic coil 12 is energized. Here, the second reference value is varied according to the temperature of engine cooling water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a starting freewheel for an automobile engine, and connects the engine rotating shaft to the freewheel so that the engine is stopped when stopped and the power accumulated in the freewheel is used when restarting. The present invention relates to an idle stop control device that performs engagement/disengagement control between.

Car engines emit harmful exhaust gases even when the car is idling or stopped. With the main purpose of reducing this exhaust gas emission, the applicant first developed a freewheel device for engine starting, that is, the engine is stopped when the engine is stopped, and the power stored in the freewheel is used when restarting. proposed a device (Japanese Patent Application Laid-Open No. 49-514
Publication No. 28).

The proposed device will be explained in more detail with reference to FIG.

In Fig. 1, 71 is a freewheel for starting the engine, 72 is an engine side flywheel, 73 is a lining, 74 is an engine drive shaft, 75 is an electro-pneumatic actuator, 76 is a return spring, and 77 is a with draw lever. , 78 is the pivot, 79 is the thrust bearing,
80 is a vacuum tank, 81 is a clutch, 82 is a slave cylinder, 83 is a return spring, 84 is a with draw lever, 85 and 85' are rotation number sensors, 86 is a control circuit, and 87 is a vehicle speed sensor. When the vehicle is driven by engine power, the rotation of the engine drive shaft 74 is transmitted to the axle through the slave cylinder 82 by moving the lever 84 to operate the clutch 81 and through the transmission (not shown). At this time, the control circuit 86
When the actuator 75 is actuated by the main signal SON from the motor and the lever 77 is moved to rotate the freewheel 71 in contact with the lining 73, power is accumulated in the freewheel 71.

The engine will automatically stop when the vehicle stops at an intersection, etc. At the same time, when the clutch 81 is turned off and the on signal SON is switched to the off signal 5OFF, the actuator 75 becomes inactive, the lever 77 is returned by the spring 76, and the freewheel 71 separates from the lining 73 and rotates freely. When restarting, turn on signal SON again
By operating the actuator 75 to connect the freewheel 71 to the lining 75, the engine drive shaft 74 rotates and the engine starts, and the clutch 8
By inputting 1, the car starts running.

The above is an overview of the configuration and operation of the device shown in Figure 1.The relationship between the on/off operation of the freewheel 71 and the driving state of the vehicle can be summarized as follows (1) When starting, press the accelerator. When clutch 81 is engaged, freewheel 71 is turned on. (2) During acceleration, if the freewheel rotation speed reaches 1500 [rpm], the freewheel 7
1 is on. (3) During acceleration or constant speed driving, when the freewheel rotation speed reaches 1500 [rpm], the freewheel turns off. (4) During acceleration or constant speed driving, the freewheel is off as long as the engine speed is lower than the freewheel speed. (5) When the engine speed becomes higher than the freewheel speed during acceleration or constant speed driving, the freewheel is turned on. (6) When decelerating, the freewheel is turned off because the acceleration of the engine speed becomes negative. (7) When stopped,
When the accelerator is released and the clutch 81 is disengaged, the ignition is turned off and the engine stops when the vehicle speed reaches zero. At this time, the freewheel continues to be off, ie, freely rotating. (
8) When restarting, if you step on the accelerator in neutral or release the clutch and press the accelerator, the freewheel 71 will start the engine. If the freewheel rotation speed drops below a predetermined rotation speed while the vehicle is stopped or the engine is started, switch to the starter motor. (9) If the freewheel rotation speed is below the predetermined rotation speed while the vehicle is running, the engine will not stop even if the vehicle is stopped.

By adopting the device shown in Figure 1, which has the configuration and operation described above, no exhaust gas is emitted while the vehicle is stopped, and restarting after the vehicle is stopped is performed using the power stored in the freewheel, so the battery, starter, etc. This has the effect of reducing the load on the motor.

However, in such conventional idle stop control devices, if the engine cannot be started due to the freewheel connection, the starter motor is configured to start the engine with the freewheel connected to the engine side. Therefore, the energy required to drive the starter is large, which adversely affects the durability of the battery and starter motor, and at the same time, there is a problem in that energy loss is large, which is disadvantageous in achieving reductions in fuel consumption.

The present invention has been made by focusing on such conventional problems, and when it becomes necessary to start the engine using the starter switch and restart the engine after idling stop using the motor, the freewheel is moved from the engine side. Disconnect and drive the freewheel from the motor, stop the motor when the freewheel rotational speed rises to a preset value, connect the freewheel to the engine side to start the engine, and then set the above settings. It is an object of the present invention to solve the above-mentioned problems by changing the value according to the flow of engine cooling water.

The present invention will be explained below based on the drawings.

FIG. 2 is a sectional view showing an embodiment of the present invention. First, the configuration will be described. A freewheel 26 is attached to a crankshaft 21, which is an engine output shaft, via a bearing 22 so as to rotate freely. A flywheel 24 is fixed to the output side end face of the crankshaft 21. An electromagnetic coil 12 is fixed to the rear plate 25 of the engine, and the flywheel 2 faces this electromagnetic coil 12.
There is a freewheel 23 on the side of the engine block side of 4.
The engagement/separation clutch 27 is attached in a cantilevered manner. Therefore, when the electromagnetic coil 12 is energized, the clutch 27
is attracted to the freewheel 23, the freewheel 26 and the flywheel 24 become connected, and the rotation of the flywheel 24 is transmitted to the freewheel 26,
Alternatively, the rotation of the freewheel 23 is the rotation of the flywheel 2.
4, the freewheel 23 is transmitted to the crankshaft 21
It rotates as one. On the other side of the flywheel 24, an engine drive shaft 29, which is an output transmission shaft, and a crankshaft 2 are mounted.
The main clutch device 28 that engages and disengages from the main clutch device 1 is shown in several examples. Freewheel 26 and flywheel 24
A freewheel and ring gears 23A and 24A for detecting the rotational speed of the flywheel are attached to the outer periphery of each of them, along with an electromagnetic pickup (not shown).

FIG. 6 is a diagram showing one embodiment of the control circuit. In Fig. 3, 81 is a starter switch (hereinafter referred to as stsw) signal, and S2, which goes high when stsw is ON, is an ignition switch (hereinafter referred to as IgSW) signal, and when IgSW is ON,
It becomes “H” when . S is a vehicle speed signal, which outputs a pulse signal corresponding to the vehicle speed, but does not output when the vehicle speed is °'0'. S4 is a water temperature signal, and the water temperature is within the set range (for example, 60°C).
-100°C), it becomes "H". S5 is a load signal, which becomes "L" when the car's lights, air conditioner, heat wire, etc. are operating. S6 is a clutch signal, which becomes H" when the clutch is depressed. S7 is an engine speed signal, which outputs a pulse signal (for example, a crank angle sensor signal, an ignition signal, etc.) corresponding to the engine speed. S8
is an accelerator signal, and when the accelerator is released, "L" is output. S is a freewheel rotational speed signal, which outputs a pulse signal (for example, a signal from an electromagnetic pickup) corresponding to the freewheel rotational speed, and there is no output when the rotational speed is ``0''.

S10 is a fuel cut (hereinafter referred to as fuel cut) signal, which determines the idle link state and stops the engine (
(hereinafter referred to as idle stop), the fuel supply is cut off. sho is an ignition cutoff (hereinafter referred to as ig cut) signal, which performs ig cut during idle stop.

S11 is a starter drive signal which is used to drive the starter motor when stsw is turned on (at initial start) and when the engine cannot be started with freewheeling after idle stop.

Next, the configuration of the circuit will be explained.

A one-shot multivibrator (hereinafter referred to as MM circuit) is triggered when the stsw signal S1 changes from "L" to "H" and outputs a pulse signal. 2 is also an MM circuit, which is triggered when the IgSW signal S2' changes from "L" to "H" and outputs a pulse signal. Reference numeral 6 denotes a flip-flop circuit (hereinafter referred to as an FF circuit) whose state is changed by the signal from the MM circuit 1.2. The output of FF circuit 3 is fuel cut.

It is input to the ig cut signal output circuit 5 and the starter drive signal output circuit 16f, and provides conditions for the output of each circuit. 4 is an engine I/tub condition judgment circuit, when the vehicle speed signal S is '0' or less than a set value (for example, #2 to #/h), the water temperature signal S is 'H' (the water temperature is within the set range). )
, and the load signal S is ゛Hpa (that is, there is no load usage)
It has a function that outputs a pulse signal when the vehicle is running, and also stores whether the vehicle has traveled in the past (for example, whether the vehicle has traveled for 10 hours or more than 2 hours), and the memory is stored when the initial start or idle stop operation is activated. If you do this, you will receive seven sotos. fu
The el cut/ig cut signal output circuit 5 outputs f when the idle stop conditions are met, that is, when the engine stop condition judgment circuit 4 outputs a pulse signal
uel cut signal S10 and ig cut signal S10'
output and stop the engine. Reference numeral 6 denotes a starter drive condition determining circuit which determines whether it is an initial star 1 or an engine start after idling stop, and outputs a signal corresponding to each. In the 7-digit engine speed judgment circuit, the engine speed signal s7 is set to a set value (for example, 25
0rprn) If it is less than L°゛, if it is more than '
Outputs H'. The starter drive signal output circuit 16 outputs a starter drive signal s11 at the initial start or when the engine cannot be started due to the rotational energy of the freewheel. 15 is a delay circuit, which creates a delay time (approximately 0.5 seconds) in the starter drive mode after the freewheel is connected to the engine.It is reset when the engine is started by the freewheel, and it takes no time to drive the starter. Eliminate. 10 is frequency/voltage (
A converter (hereinafter referred to as F/V) converts the freewheel rotational speed signal S into a voltage. A 17-digit comparator compares the output of the F/V converter 10 with the set value set in the set value switching circuit 18 (for example, 25 Orpm when the freewheel is connected to the engine) and determines the freewheel rotation speed. When the value exceeds a set value, a signal is sent to the motor drive signal output circuit 16 to stop or prohibit starter drive, and at the same time, a reset signal is sent to the delay circuit 15 via the inverter 19. Reference numeral 11 denotes an electromagnetic coil control circuit that turns on or off the excitation current of the electromagnetic coil 12 according to a control input signal. Furthermore, a signal is input to the set value switching circuit 18 via the AL line 1, and the set value of the engine star 1 - possible freewheel rotation speed is switched depending on the state of water. 12 is an electromagnetic coil. The freewheel is engaged and disengaged by this energization and disconnection.The accelerator signal S8 is used as a signal to engage and disengage the freewheel during one run, and at the same time, the starter is driven while the engine is running. The role is to prevent this from happening.

Next, the effect will be explained.

At the first M star h, when gSW is turned on, IgSW
The signal S2 becomes '■°', and this signal causes the MM circuit 2 to
is applied to l-IJ and outputs a pulse signal ("L"). This signal is input to the FF circuit 6 and the starter drive condition determination circuit B. The signal from the MM circuit 2 causes the FF circuit 6 to change its state (more precisely, the state of the FF circuit 6 is not determined at this point in time), and the output becomes "L".

This "L" signal is input to the fuel cut-ig cut signal output circuit 5 and the starter drive signal output circuit 16, and stops outputting the starter drive signal S11 during IgSWON, and also outputs the fuel cut signal SIO.
This prevents the occurrence of erroneous output when the power is turned on, by, for example, stopping the output of the ig_cut signal S'IO. The same applies to the signal of the MM circuit 2 inputted to the starter drive condition determination circuit 6VC, to prevent the starter drive signal S1□ from being erroneously output. In other words, the starter drive condition judgment circuit B has the following information: When starting the engine after idling, if the engine cannot be started by freewheeling,
It has the effect of driving the starter. This effect is caused by IgS
The MM circuit 2 signal 12 prevents malfunction during WON. After IgSWON, stsw is turned ON and the torque signal S1 changes from °L° to 'H' l/(m), and the MM circuit 1 is triggered to output a pulse signal ("L").This causes the FF circuit 6 to output an output signal. 'L゛.

Change from II HII to fuel cut
- When idle stop operation is performed by acting on the ig cut signal output circuit 5, fuel cut-ig c
At the same time as the ut signal is enabled to be output, it also acts on the starter drive signal output circuit 16, and at the time of initial start and engine start after idling stop, if the engine cannot be started due to freewheel connection, - It is possible to give rotational energy to the separated freewheel.

When StSW is turned on, the signal is output from MM circuit 1 as described above.
L" signal is output, and this signal is input to one side of the NOR circuit 13. A signal from the engine rotation speed determination circuit 7 is input to the other input of the NOR circuit 13. This engine rotation speed determination circuit 7 outputs "L" when the engine is in a stopped state or a state close to it (for example, 250 rpm or less).Since the engine is in a stopped state at the initial start, the output of the engine rotation speed determining circuit 7 is L°.

Therefore, the "L" signal from the MM circuit 1 causes the NOR circuit 16 to output a "H" signal. NOR circuit 13
The output acts on the electromagnetic coil control circuit 11 and the delay circuit 15. The electromagnetic coil control circuit 11 uses the "H" signal from the NOR circuit 16 as a trigger signal to supply an exciting current to the electromagnetic coil 12, and at the same time, the delay circuit 15 also outputs an NOR signal.
H° from circuit 16.

Triggered by a signal to start delay operation.

When an exciting current flows through the electromagnetic coil 12, the freewheel 26 is joined to the engine side. At the initial start, in most cases, the freewheel 260 rotational energy is at or close to zero. However, from the running condition,
When the vehicle is stopped, the ignition key is turned off for a very short period of time, and the engine is started again, sufficient rotational energy may be retained, in which case it is possible to start the engine using freewheeling. . Therefore, even at the initial start, the freewheel is connected to the engine side.

Delay circuit 151: Determines the time required to start the engine with this freewheel and, if the engine cannot be started, a trigger signal for outputting a motor drive signal to apply rotational energy to the disconnected freewheel by the motor. It plays the role of outputting.

When stsw is turned on, the freewheel connects to the engine side, and the engine starts as a result of which the operation is as follows. Freewheel rotational speed signal S, is F/
It is input to the comparator 17 through the V converter 10. At this time, since the freewheel 26 is joined to the engine side, the rotational speed of the freewheel is equal to the engine rotational speed. The comparator 17 compares the output of the F/V converter 10 and the set value set by the set value switching circuit 18 (for example, a voltage value corresponding to 250 rpm), and when the output exceeds the set value,
L" signal is outputted to the delay circuit 1 via the inverter 19.
5 is reset L, and starter drive signal output circuit 1
The L" signal is fed into 6 by one inch. By receiving the "L' signal from the starter drive signal output circuit 16Fi, the starter drive signal S11 is not output.

Next, if the engine is not started due to freewheeling, the output of the comparator 17 is 1°°H'', and the delay circuit 15 continues its operation without being reset.
As the set time elapses, a °゛H°゛H°゛ signal is output. The signal input from the comparator 17 to the starter drive signal output circuit 16 remains at "H". Upon receiving the trigger signal from the delay circuit 15, the electromagnetic coil control circuit 11 stops energizing the electromagnetic coil 12 and starts the freewheel 26. At the same time, the starter drive signal output circuit 16, which is in the starter drive preparation state by the signal from the FF circuit 6, outputs the starter drive signal Sll in response to the trigger signal from the delay circuit 15, and starts the starter motor. When sufficient rotational energy is transferred to the freewheel 26 by the motor drive, and the rotational speed of the freewheel reaches the set value switched according to the state of the water temperature in the set value switching circuit 18, the starter drive signal is activated. The operation of the output circuit 16 is stopped. At the same time, the electromagnetic coil control circuit 11 energizes the electromagnetic coil 12 again, connects the freewheel 23 to the engine side, and starts the engine. Then, the engine shifts to the idle state. At this time, Assuming that the conditions for idle stop are as follows: the switching vehicle speed signal S3 is 0°, the water temperature signal S4 is 0°, and the load signal S is 0°.

Even if the six conditions of "H" are met, the memory action of the engine stop condition judgment circuit 4 will cause it to be judged whether the vehicle has entered the running state or not, and if it is determined that there is no running history. Does not output idle stop signal.

This history is cleared at initial start and idle stop. In this way, the engine does not stop even if it shifts to the idle state.

From the idle state, it runs quickly and returns to the idle state,
3 signal S3. If the above-mentioned conditions of S, S5 are satisfied, a pulse signal is output from the idle stop condition determining circuit 4 (at this time, the driving history is cleared). This signal is sent to the fuel cut-ig cut signal output circuit 5.
is input to output the fuel cut/ig cut signal 7, and the engine is stopped. Also, the signal from the idle stop condition judgment circuit 4 is input to the starter drive condition judgment circuit B, which applies rotational energy to the disconnected freewheel in case the freewheel fails to start the engine when restarting the engine. To prepare for starter drive, enable starter drive so that it can be used. The engine can be restarted after idle stop by stsw or clutch depression. The case of stsw is as described above. The case using a clutch is as follows.

When the clutch is depressed, the clutch signal s6 becomes °'H°
Become ゛. The starter drive condition judgment circuit 6 receives this signal.
outputs a control signal to the electromagnetic coil control circuit 11 and the delay circuit 15, the electromagnetic coil control circuit 11 energizes the electromagnetic coil 12, and the delay circuit 15 starts a delay operation. Further, the starter drive condition judgment circuit 6 sends a message to the starter drive signal output circuit 16 that if the start cannot be started due to freewheeling, -
A signal for driving the starter is output so that rotational energy can be given to the freewheel that has just been separated. In this case, the determination as to whether to perform an initial start or a restart is made within the starter drive condition determination circuit B. The subsequent operation until the engine start is completed, that is, F/
The operations of the V converter 10, comparator 17, delay circuit 15, and starter drive signal output circuit 16 are the same as in the 5t SWON.

The AND circuit 9 inputs the accelerator signal S8 and the signal from the engine speed determination circuit 7, and stores energy in the freewheel while the vehicle is running. That is, when the accelerator is depressed, the electromagnetic coil control circuit 11 is
“Send a signal to energize the electromagnetic coil 12, connect the freewheel to the engine side, and when you release the accelerator, send a “L°” signal to the electromagnetic coil control circuit 11 to cut off the electromagnetic coil 12 and remove the engine from the engine. By detaching the freewheel, an operation is performed to prevent the rotational energy of the freewheel from decreasing due to a decrease in engine rotation.

・19・ Next, the configuration of the set value switching circuit 18 will be explained with reference to FIG. In FIG. 4, 48 is a water temperature sensor composed of a thermistor or the like, which detects the engine cooling water temperature representative of the engine temperature. 49.50.51 is a comparator, which outputs a voltage signal corresponding to the detected temperature from the water temperature sensor 48 and comparison set voltages 52, 53.54 (corresponding to the comparison set temperatures (TI, T2, T3'). Vr, ,
Vr2. Vrs), and when the detected temperature from the water temperature sensor 48 is lower, the
"° is output. The set temperature T, , T2. The magnitude relationship of T is T, (T2(T3(V r,) Vr2>Vr,
). That is, the comparator 49 detects when the temperature is very low.
The comparator 51 detects when the engine is sufficiently warm.
detects each intermediate state.

55 and 56 are inverters, each comparator 4950
Negate the sign of the output of . 57, 58.59 are AND gates, and 57 comparators 49, 50.51 are all "H"
When the output is H'', 58 outputs the output of the comparator 49.
When the output of the comparators 50 and 51 is "H", it outputs °°H°°, the output of the comparators 49, 20, and 50 is "L I+", and the output of the comparator 51 is "H". °
When , outputs °H°゛. 6o is an inverter that inverts the sign of the output signal (a) of the electromagnetic coil control circuit 11. 61 and 62.65 are Antogame-1, respectively.
One input is the signal from the inverter 60, and the other input is the output of the AND gates 57, 58, and 59. 64-6
7 is for setting the reference voltage for comparison corresponding to the set value of the rotation speed as set value (1) to set value (4), respectively.
Among these, setting value (1) is a setting value for detecting that the freewheel is almost in a stopped state, and corresponds to a rotation speed of 25 orpm, for example, setting value (2), setting value (3), Set value (4) is a set value (set value (2)> set value (3)> set value (4) to detect that the freewheel rotation speed has increased to a sufficient rotation speed according to the engine cooling water temperature. )). switch 5at) is
The switch SVi/(2) is closed when the output signal (a,) of the electromagnetic coil control circuit 11 is H'.
At °L°, the output of the AND gate 61 is "H" (closed when D, and switch sw (3) has signal (a) at L.

The switch 5W(4) is closed when the output of the AND gate 62 is "H", and the switch 5W(4) is closed when the signal (a) is "L" and the output of the AND gate 63 is "H".

Next, the operation of the embodiment of the present invention will be described.

The freewheel 26 is connected to the engine side when starting the engine with 5tSWON and when restarting the engine after idling stop. In this case, if the freewheel 23 does not have sufficient inertial energy, the motor will be used.

The operation of the set value switching circuit shown in FIG. 4 will be explained. st
The operation of starting the engine using the motor when starting the engine using SW and when restarting the engine after idle stop is as described above. In that case, 1. Set the rotation speed of the freewheel 26 to engine start.

It is necessary to increase the rotation speed by 1. The set value switching circuit 40 shown in FIG. Immediately before 12, an excitation current drive circuit (not shown) is provided,
The switch SW (1) of the first group is closed or the switch SW (1) of the second group is Setting values (1) to (4) are switched by closing any one of the group switches SW(2), SW(3), and SW(4). Second group switch SW (
The conditions for closing 2) to 5W (4) include signal (a)
In addition to "L", the state of the output signals of the comparators 49-51 is also included.The outputs of these comparators 49-51 become "H" or "L" depending on the engine cooling water temperature. For example, if the engine coolant temperature is lower than the lowest set temperature T1, the outputs of comparators 49, 50.51 will be °
'H°', and at this time the output of the AND gate 57 becomes °
H°, this turns on the switch 5W(2) via the AND gate 61, and the set value (2) is selected.

This set value (2) is input to the comparator 39 and compared with the freewheel rotation speed signal S. In addition, when the engine cooling water temperature is between the set temperatures T1 and T2, the output of the comparator 49 is ``L°'', the output of the comparator 50.51 is ``H''°, and at this time, the output of the AND gate 58 is becomes H°゛, this is an AND gate, 23.

62 to switch SW (3), and set value (
3) is selected. Similarly, when the engine cooling water temperature is between the set temperatures T2 and T3, the output of the comparator 49.50 is °L゛°, the output of the comparator 51 is 'H°'', and in this case, the output of the AND gate 59 is The output becomes "H", the switch SW (4) is turned on, and the set value (4) is selected. In this way, in the comparator 17, the signal (a)
When is °′Lpa, the freewheel rotational speed signal S, is
The set value of the rotation speed according to the engine cooling water temperature at that time (2
) to set value (4). Setting value (1) is used to detect the rotation speed of freewheel 2 when freewheel 23 and flywheel 24 are joined, and when the engine starts as a result of joining, freewheel 2
6 rotates integrally with the flywheel 24, and does not fall below the set value (1), and the output of the comparator 39 is "L" -! It's a trench. If the engine cannot be started due to the connection,
The rotation speed of the freewheel 23 becomes less than the set value (1), and the output of the comparator 17 becomes 'H°'. When the output of the comparator 17 becomes "H", the control circuit shown in Fig. 6 operates as described above, depending on the case of starting by stsw or restarting after idle/24/stop, and the electromagnetic The excitation command signal (a) of the coil 12 becomes °L, and the switch SM1. ), and switch [5] selected according to the engine coolant temperature.
W(2) to 5W(4)] and switch the set value from set value (1) to set value (2) to set value (4). When the number of revolutions of the freewheel 26 driven by the motor exceeds the selected set value, the output of the comparator 17 becomes 'L°', the motor is stopped, and the electromagnetic coil 12 is energized. , the freewheel 23 and the flywheel 24 are joined, and the engine is started.

As explained above, according to the present invention, s, t s
If the number of freewheel revolutions is small when starting the engine with w or when starting the engine after idling is stopped and the engine cannot be started using the freewheel alone, disconnect the freewheel from the -tan engine side and apply rotational energy to the freewheel using the motor. When the freewheel rotational speed rises to the set value, the motor is stopped, one freewheel is connected to the engine side, and the engine is started. Since the set value is changed according to the engine cooling water temperature, less energy is required to drive the motor, which makes it possible to reduce the motor capacity, which is also advantageous in terms of battery and motor durability. This has the advantage that the reduction in fuel consumption due to engine stop can be further improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the conventional example, FIG. 2 is a sectional view of the embodiment of the present invention, FIG. 6 is a circuit diagram of the embodiment of the present invention, and FIG. 4 is details of the set value switching circuit 18 in FIG. 6. It is a diagram. Explanation of symbols 4...Engine stop condition judgment circuit 5...Fuel cutoff/ignition cutoff signal output circuit 6...Starter drive condition judgment circuit 7...Engine speed judgment circuit 10...F/v converter 11...・Electromagnetic coil control circuit 12...Magnetic coil 16...Starter drive signal output circuit 17.49.50.51 River comparator 18...Set value switching circuit 21...Crankshaft 2
3...Freewheel 24...Flywheel 27...Clutch for engagement and separation 28...Main clutch device 29...Engine drive shaft 48...Water temperature sensor S
1...Starter switch signal S2...Ignition switch signal S,...Vehicle speed signal S4...Water temperature signal S,...Load signal S6...Clutch signal S7...Engine speed signal S8... Accelerator signal S...Freewheel rotation speed signal S, 0...Fuel cutoff signal S...Ignition cutoff signal Sl+...Starter drive signal Attorney Junnosuke Nakamura

Claims (1)

[Claims] Equipped with a starting freewheel that can rotate freely or integrally with the engine rotation shaft by engaging and disengaging the clutch.
Idle stop control that uses the power accumulated in the freewheel when the engine accelerates or rotates at a constant speed by engaging the clutch to rotate the unit, and when decelerating by disengaging the clutch to allow the freewheel to rotate freely, and when restarting the engine after stopping the idle. In the device, a means for comparing the freewheel rotational speed with preset first and second rotational speed setting values, and when the freewheel rotational speed at the time of starting the engine is less than or equal to the first rotational speed setting value. The freewheel is separated from the engine side and the motor drives the engine and the freewheel until the rotation speed increases to the second rotation speed setting value, and the freewheel rotation speed reaches the second rotation speed setting value. An idle stop control device comprising: control means for joining the freewheel to the engine side when the freewheel is connected to the engine side; and set value switching means for changing the second rotation speed set value according to the engine cooling water temperature. .