JPH0138014B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a vehicle, such as an automobile, which is driven via a clutch by the rotation of an engine on which it is mounted. With conventional systems, restarting the engine once it was stopped required the trouble of operating a key switch, so it was customary to not stop the engine even if the waiting time at a traffic light was long. This has the disadvantage of being economically and environmentally undesirable, as it wastes fuel and generates excess exhaust gas. In order to eliminate such drawbacks, the present invention aims to provide an automatic engine stop and restart device that automatically stops and restarts the engine in conjunction with vehicle stop and restart operations. shall be.

[Table] As shown in Table 1, in the vehicle, when the vehicle is operated to apply the brakes and the vehicle stops, the setting state is entered, and when the operation to apply the brakes is stopped and the engine is accelerated, the vehicle is stopped. A memory device that returns to the reset state when the clutch is moved from a disengaged state to a half-clutch state and maintains the reset state as long as the vehicle is running, and a brake control device that keeps the brakes applied when this memory device is in the set state. further comprising: an engine control device that does not allow the engine to continue rotating until the storage device is in the setting state and the operation in the direction of increasing the clutch separation does not reach a certain position; This automatic engine stop and restart device is provided with a control device that starts the engine when the engine reaches the predetermined position and the engine is stopped. Next, the present invention will be explained with reference to an embodiment whose circuit is shown in FIG. The battery 1 located at the lower right side of the figure is charged by a generator (not shown) driven by the rotation of the engine, and its negative electrode is connected to the body of the vehicle. A headlight 2 is installed between the positive electrode and the vehicle body outside the battery 1.
are connected via a normally open lighting relay switch 3, and a lighting relay coil 4, which closes the lighting relay switch 3 when energized, is connected via a lighting switch 5. Terminal B of the key switch 6 near the upper right of the figure is connected to the positive terminal of the battery 1, and when the handle (not shown) is turned counterclockwise in three steps, the terminal B is sequentially connected to the terminals ACC, ACC, and IG inside the key switch 6. ACC and IG
Conducts with ST. Although the terminal ACC is not shown, it is connected to the accessories including the logic circuit used in this circuit for power supply. To install it, turn it slightly clockwise after starting the engine to cut off the continuity between B and ST. The primary side of the ignition coil of the ignition device 7 is inserted between the terminal IG and the vehicle body, and a pressure switch 8 is installed that opens when the engine stops rotating in response to the pressure of the engine's lubricating oil.
is placed on the vehicle body side, and an indicator lamp 9 serving as a resistor is inserted in series connection with the terminal IG placed on the side. A starting motor 10 is connected between the positive electrode of the battery 1 and the vehicle body.
is inserted through a normally open starting relay switch 11, and a starting relay coil 12 that closes the starting relay switch 11 when energized is inserted between the terminal ST and the vehicle body. The vehicle stop sensor 13 located near the upper left of the figure has a reed switch placed near a permanent magnet that is driven by the drive shaft of the travel speedometer and repeatedly opens and closes when the vehicle is running, but when the vehicle is stopped it either opens or closes. Either one or the other can be maintained. Alternatively, as the vehicle stop sensor 13, the ferromagnetic plates driven by the drive shaft may be alternately cut out near the outer edge, and the permanent magnet and reed switch may be left stationary with these portions sandwiched between them. Also, a Hall element may be used in place of the reed switch. The vehicle stop identification circuit 14 includes resistors r ₁ to _{r 7} , r ₂ ', capacitors C ₁ to C ₃ , transistors T ₁ and T ₂ , and a NOT element NOT ₁ connected as shown in the figure.
Vehicle stop sensor 13 is interposed between the terminal and the vehicle body.
When the reed switch opens or closes (the vehicle is running), a high potential is output; when the reed switch continues to open or close (the vehicle is stationary), a low potential is output. Hereinafter, the height of the potential will be represented by (1) and (0). In other words, the reed switch continues to open or close.
When the discharging and charging of C ₁ is saturated, there is no voltage on r ₂ and T ₁ is cut off, there is no voltage on r ₄ and T ₂ is cut off, and the input of NOT ₁ becomes (1) and the output becomes (0). When the reed switch repeats opening and closing, only during closing
T ₁ conducts, C ₂ charges and discharges to an average voltage,
T ₂ is always conductive, the input of NOT ₁ is (0), and the output is
(1) becomes. Since the charging and discharging of C ₂ and C ₃ takes time as the resistances r ₄ and r ₇ are also involved, the output potential changes with a slight delay in the start of stopping and restarting the vehicle. The brake switch 15 shown below the vehicle stop sensor 13 closes only when the brake pedal is depressed to apply the brakes. Open when releasing the pedal. The receiving circuit 16 connects one end of a series connection of resistors r ₈ and r ₉ connected at a point P to a terminal IG and the other end to the vehicle body via a brake switch 15, and connects the point P to the vehicle body via a capacitor _C4 . and is connected to the setting input terminal 1 of the storage device to be described later through a Schmitt actuated knot element NOT ₂ , and the potential at point P is turned on when the brake switch 15 is open. In other words, when terminal IG conducts to terminal B, (1)
Therefore, the potential at the output terminal of NOT ₂ first becomes (1) and then becomes (0). When the brake switch 15 is closed, the potential at point P becomes (0), and the potential at the output terminal of NOT ₂ becomes (1) with a slight delay. Brake switch 1
When 5 opens, the change is opposite to the above. C ₄ and
NOT ₂ functions to remove power supply noise and prevent switch chatter. An acceleration switch 17 shown below the brake switch 15 is closed when an acceleration operation is being performed, and a half-clutch switch 18 in series with it is closed only when the clutch pedal is released from depression to enter the half-clutch state and thereafter. The receiving circuit 19 has resistors r10 and r around point Q.
11. A capacitor C ₅ and a Schmitt actuated knot element NOT ₃ are connected in series with the terminal IG, switches 17 and 18, and in the same relationship as in the car body and the receiving device 16, and the acceleration switch 17 and the half-clutch switch 18. The change in the potential at point Q and the potential at the output end of NOT ₃ when both are closed and at least one is open is due to the closing of the brake switch 15 of the receiving device 16.・Same as the change in potential at point P and the output terminal of NOT ₂ when open. The functions of removing power supply noise and preventing switch chatter are also similar. Reset circuit 20 shown below receiving circuit 19
connects point R to terminal IG through resistor _r12 and r12,
It is connected to the vehicle body via capacitor C ₆ and to return input terminal 1 of the storage device described below via Schmitt actuated NOT element NOT _4. When the power is turned on,
First, set the potential at the output terminal of NOT ₄ to (1), then to (0). At this time, the specifications are determined so that the potential becomes (0) later than the potential at the output terminals of NOT ₂ and NOT ₃ . The memory circuit 21 stores the vehicle stop identification circuit 14.
A NOR circuit NOR ₁ is provided which receives as input the output of NOT 1 and the inverted value by the output NOT element NOT ₅ of NOT ₂ of the receiving circuit ₁₆ , and the output of NOT ₁ and the output of NOT ₃ of the receiving circuit 19, Reset circuit 20
A NOR circuit that receives the output of NOT ₄ as input.
NOR ₂ is provided, the output of NOR ₁ is received at the set input terminal, the output of NOR ₂ is inverted by NOT element NOT ₆ and received at the reset input terminal, and the NOR circuits NOR ₃ and NOR _{4 are} connected.
An R-S flip-flop FF ₁ consisting of
It has NOT ₇ and NOT ₈ . If you turn on the power while the vehicle is stationary and not applying the brakes or accelerating,
The output of NOT ₁ is (0), and first, NOT ₂ ,
The output of NOT ₃ changes from (1) to (0) with a slight delay.
The output of NOT ₄ changes from (1) to (0). At this time
Since the input 1 of NOR ₁ is inverted by NOT ₅ , its 2 inputs become (0), (0) to (0), (1), and the output of NOR ₁ , that is, the setting input of FF ₁ is ( 1) becomes (0). On the other hand, the three inputs of NOR ₂ are first (0), (1), (1) to (0), (0), (1
)
Therefore, the output of NOR ₂ remains (0), therefore,
The output of NOT ₆ , that is, the return input of FF ₁ remains at (1), and the output of NOT ₇ changes from (1) to (0),
The output of NOT ₈ remains as (1). Next, when the output of NOT ₄ changes from (1) to (0), the three inputs of NOR ₂ change from (0), (0), (1) to (0), (0), (0),
The output of NOR ₂ changes from (0) to (1), and the return input of FF ₁ changes from (1) to (0). If you depress the clutch pedal without applying the brake, perform an acceleration operation, and then return the clutch pedal, the half-clutch switch 18 opens and the acceleration switch 17 opens.
is closed, and the half clutch switch 18 is closed. As a result, the output of NOT ₃ becomes (1). On the other hand, the vehicle starts running and the output of NOT ₁ becomes (1). As a result, the output of NOR ₁ , that is, the setting input of FF _1, remains (0), while the output of NOR ₂ changes from (1) to (0).
The output of NOT ₆ , that is, the return input of FF ₁ changes from (0) to (1), but the outputs of NOT ₇ and NOT ₈ remain (0) and (1), respectively. When the vehicle is running, the acceleration switch 17 and the half-clutch switch 18
The opening and closing of NOT ₇ and NOT ₈ have no effect on the output of NOT 7 and NOT 8. This is because the input 1 of NOR ₂ is always (1) and therefore its output is always (0). Next, when the brake pedal is depressed, the brake is applied and the vehicle decelerates, and the brake switch 15 is closed, and the output of NOT ₂ becomes (1) and the output of NOT ₅ becomes (0). Since no acceleration operation is being performed at this time, the acceleration switch 17 is open, and NOT ₃
The output of is (0). When the vehicle stops in this state, all inputs of NOR ₁ and NOR ₂ are set to 0.
Therefore, the setting input for FF ₁ is (1), and the return input is (0).
becomes. As a result, the outputs of NOT ₇ and NOT ₈ become (1) and (0), respectively. This state is stored in the storage device 21.
This refers to the setting state of . Next, release the brake pedal, press the clutch pedal to perform acceleration operation as described above, and release the clutch pedal.The output of NOT ₂ is (0), so
If the input 1 of NOR ₁ is (1), then NOT ₃ in the same way as above
The output of NOR ₁ and NOR ₂ are both (0), so the setting input of FF ₁ is (0), the return input is (1), and the output of NOT ₇ and NOT ₈ is (1). Return to (0) and (1) respectively. This state will be referred to as the return state of the storage device 21. The output of the NOT element NOT ₇ is connected to the base of an nP _o type transistor T ₃ of the lighting and brake control device 22. The emitter of the transistor _T3 is connected to the vehicle body, the collector is connected to the terminal IG via a relay coil 23 for lighting and brake control, and a surge absorption diode D1 is provided in parallel with the relay coil ₂₃ . Normally closed lighting control relay switch 2 that opens when the relay coil 23 is energized
4 and a normally open brake control relay switch 25 which closes when relay coil 23 is energized. A lighting selection switch 26 is provided in series with the lighting relay coil 4 and the lighting switch 5, and a lighting control relay switch 24 is connected in parallel thereto. The brake control relay switch 25 is connected between the terminal IG and the vehicle body in series with an electromagnetic coil 28 that closes a separately provided brake lock valve 27 and a brake selection switch 29, and a surge absorption diode is connected in parallel with the electromagnetic coil 28. D ₂ is provided. Here, the brake lock valve 27 is connected to the electromagnetic coil 2.
8, as shown in FIG. 2, it is pressurized via the brake pedal 30 and the wheel cylinder 3
Even if the hydraulic path 32 leading to the brake pedal 1 is cut off midway and the foot is released from the brake pedal, the pressurized state is maintained and the braking state continues. In Fig. 2, 33 is a master cylinder that converts the depression of the brake pedal into hydraulic pressure, 34 is a pressure switch that closes with hydraulic pressure, 33 is an acceleration pedal, 17 is an acceleration switch, 36 is a clutch pedal, 18 is a half clutch switch, and 37 is a This is a starting switch that is closed when the clutch pedal 36 is depressed. When the memory device 21 is in the reset state, that is, when the output of NOT ₇ is (0), the transistor _T3 is in the cutoff state and no current flows to the relay coil 23, and the lighting control relay switch 24 is closed as shown in the figure, and the brake control is performed. Relay switch 25 is open. Therefore, when the lighting switch 5 is closed, the headlight 2 is turned on even if the lighting selection switch 26 is opened.
Further, even if the brake selection switch 29 is closed, the brake lock valve 27 does not operate. When the lighting selection switch 26 is open and the brake selection switch 29 is closed, when the storage device 21 is in the setting state, that is, the output of NOT ₇ becomes (1), the transistor T ₃ becomes conductive, and the relay coil 23 Current flows, lighting control relay switch 24 opens and brake control relay switch 25 closes. As a result, the headlight 2 is turned off and the brake lock valve 27 is closed to keep the brake applied. With the structure described above, the memory device 21 enters the setting state when the brake is applied to the vehicle and the vehicle stops (the output of NOT ₇ becomes (1)), and when the engine is accelerated and the clutch is released, the memory device 21 enters the setting state. When it is in the clutch state, it returns to the recovery state (the output of NOT ₇ is (0)
) and maintains the restored state as long as the vehicle is running. And lighting and brake control device 22
limits power supply to the headlights 2 and keeps the brakes applied only while the storage device 21 is in the set state. Note that the pressure switch 34 shown in FIG. 2 can be used as the brake switch 15. However, in this case, as shown by the diagonal line in Figure 1, NOR ₁ is input to 1 and NOT ₃ output is added to 3.
Must be used as input. Next, the start switch 37 described above in conjunction with FIG. 2 is closed when the clutch pedal 36 is operated in the direction of increasing clutch release (arrow) to a certain position. The receiving circuit 38 has resistors r13 and r around point 8.
14. A capacitor C ₇ and a Schmitt actuated knot element NOT ₉ are connected to the terminal IG, the starting switch 37, and the vehicle body in the same relationship as in the receiving circuit 16, so that when the starting switch 37 is closed or opened, Changes in the potential at point S and the output terminal of NOT ₉ , as well as the effects of removing power supply noise and preventing switch chatter, are the same as in the case of the receiving device 16. The following NOR ₅ , T ₄ , 40 to 43, and D ₃ constitute the engine control device 39 as a whole. The NOR circuit NOR ₅ receives the output of NOT ₈ of the storage device 21 and the output of NOT ₉ of the receiving device 38 as inputs, so that the storage device 21 is in the setting state NOT _7.
The output is (1) only while the start switch 37 is open. The output terminal of the NOR element _NOR5 is connected to the base of an npn type transistor _T4 . transistor
The emitter of _T4 is connected to the vehicle body, the collector is connected to terminal IG via a relay coil 40 for engine control, and a surge absorbing diode _D3 is provided in parallel with the relay coil 40. A normally closed engine control relay switch 41 is provided which opens when a relay coil 40 is energized. An engine selection switch 42 is provided in series with the line connecting the primary side of the ignition coil of the ignition device 7 and the terminal IG, and an engine control relay switch 41 is provided in parallel with this.
is connected. With the engine selection switch 42 open, when the output of the NOR circuit NOR ₅ becomes (1), the transistor T ₄ becomes conductive, and the relay coil 40
Current flows through the engine, the engine control relay switch 41 opens, and the power supply to the ignition device 7 is stopped, preventing the engine from continuing to rotate. With this structure, once the storage device 21 is in the set state, the engine cannot continue to rotate unless the clutch pedal 36 is depressed until the start switch 37 is closed. That is, in a normal driving condition in which the clutch pedal 36 is not consciously depressed enough to close the start switch 37, when the brake pedal 30 is depressed, the brake switch 15 is closed and the vehicle stops, and the result is memorized. The device 21 enters the set state and keeps the brake applied, and
When the headlights are turned on, the engine automatically stops. However, if the clutch pedal 36 is depressed until the start switch 37 closes, or if the accelerator pedal 35 is depressed and the acceleration switch 17 is closed and the clutch pedal 36 is returned to close the half clutch switch 37, the storage device 21 is When the return state is reached, the restriction on lighting is lifted, and the brake is released, power is supplied to the lighting device 7, and the engine is in a state where it can continue to rotate. However, the engine cannot be started unless the starting motor 10 rotates. Terminal B of key switch 6 does not conduct to terminal ST,
In order to enable the operation of the starting motor 10 while only terminals IG and ACC are electrically connected, the terminal ST side of the starting relay coil 12 is connected to the starting selection switch 43 and the normally open starting control. via the series connection of relay switch 44 to terminal IG (or battery 1
A starting control relay coil 45 is provided, which closes the starting control relay switch 44 when energized.One end is connected to the terminal IG, the other end is connected to the collector of a PNP transistor _T5 , and its emitter is connected to the vehicle body. A surge absorbing diode _D5 is connected in parallel with the start control relay coil 45. When the starting selection switch 43 is closed and the base potential of the transistor _T5 is (1), the relay switch 44 is closed and the starting motor 10 is operated.
The output end of the NOR circuit NOR ₇ described later is connected to this base. Starting the engine is not necessary when the engine is rotating. Therefore, in order to identify this, the potential between the pressure switch 8 and the indicator lamp 9 is the same potential as the terminal IG when the pressure switch 8 is open because the engine is stopped, but when the engine is running Therefore, when the pressure switch 8 is closed, the potential is the same as that of the vehicle body. Taking advantage of this fact, a potential conversion circuit 46 is provided to generate outputs (1) and (0) corresponding to whether or not the engine is rotating. be. This is the resistance r ₁₅ , r ₁₆ ,
Capacitor C ₈ , diode D ₄ , knot element
It is composed of NOT ₁₀ . A NOR circuit NOR ₆ is provided whose inputs are the output of the voltage conversion circuit 46 and the output of the receiving circuit 38 related to the start switch 37 inverted by the NOT element NOT ₁₁ , and its output is inverted by the NOT element NOT ₁₂ . It is input to one input terminal of the NOR circuit NOR ₇ , and its output terminal is connected to the base of the transistor T ₅ . The current value when flowing current to the starting motor 10 is
As shown in FIG. 3, it maintains a high value until it starts rotating, but once it starts rotating, it suddenly drops to a low value, and it is known that if power supply is continued, it will maintain a low value. In this case, the drop in current means that the engine is already rotating, so continuing to supply power until after the current has dropped would waste power. Therefore, near the line through which this current passes, a reed switch 47 for start detection is installed at a position where it receives the electromagnetic force caused by this current and closes when the current is applied before starting, but opens when the current occurs after starting. The other pole is connected to the receiving circuit 48. The receiving circuit 48 is connected in the same manner as the receiving circuit 16 with resistors r ₁₇ and r ₁₈ , a capacitor C ₈ , and a Schmitt actuated NOT element NOT ₁₃ , and operates in exactly the same way. The output of the receiving circuit 48 is
It changes from (0) to (1) before the engine starts rotating, and returns to (0) immediately after it starts rotating. Next, R-S consisting of NOR circuits NOR ₈ and NOR ₉
A flip-flop FF ₂ is provided, the output terminal of the NOT element NOT ₁₁ is connected to the external input terminal of NOR ₈ , and the receiving circuit 48 is connected to the external input terminal of NOR ₉ .
A NOR circuit which connects the output terminal of NOR ₉ and receives input from the output terminal of NOR 9 and the output terminal of the receiving circuit 48.
A NOR ₁₀ is provided and its output is connected to the other input of NOR ₇ . When the clutch pedal 36 is not depressed until the start switch 37 is closed, the output of NOT ₁₁ is (1), therefore the output of NOR ₆ is (0), the output of NOT ₁₂ is (1), and the output of NOR ₇ is At (0), the starting motor 10 does not operate. Naturally, the output of the receiving circuit 48 is (0), so both inputs of NOR ₈ of FF ₂ are
(1), both inputs of NOR ₉ are (0), and one of the inputs of NOR ₁₀ is (1), so the output is (0). When the clutch pedal 36 is depressed and the start switch 37 is closed, the input of NOR ₈ of FF ₂ changes to (0), but the output of NOR ₉ remains (1).
The output of NOR ₁₀ remains (0) and the other
Since the output of NOT ₁₂ changes to (0), the output of NOR ₇ is
(1), current flows to the starting motor 10, and the output of the receiving device 48 becomes (1). This result NOR ₁₀ of 2
Although the polarity of the input is reversed, since one is still (1), the output remains (0). Therefore,
The output of NOR ₇ remains (1). When the starting motor 10 and therefore the engine start rotating and reach a certain speed, the current decreases and the output of the receiving circuit 48 becomes (0). Of the two inputs of NOR ₁₀ , the output of NOR ₉ remains (0), and the output of the receiving circuit 48 changes to (0), so the output of NOR ₁₀ becomes (1).
The output of NOR ₇ becomes (0), and the power supply to the starting motor 10 is cut off. NOR ₆ mentioned above ~
NOR ₁₀ , NOT ₁₂ , T ₅ , and 43 to 45 constitute a starting control device 49 as a whole. According to the present invention, a lighting control device can be added to the brake control device as in the above embodiment, and in this case, the lighting switch 5 is closed, the lighting selection switch 26 is opened, the brake selection switch 29 is closed, When the engine selection switch 42 is opened and the starting selection switch 43 is closed, and the vehicle is stopped by depressing the brake pedal 30 and applying the brakes while the vehicle is running, power supply to the lighting lamps is automatically restricted. This not only prevents power consumption and keeps the brake applied, but also stops the engine, and when restarting, the engine automatically starts when the clutch pedal 36 is first depressed. Next, depress the accelerator pedal 35 and the clutch pedal 36.
When the clutch is released and the clutch is partially engaged, the brake is automatically released and the vehicle starts moving, and the headlights 2 are turned on. Since the operation is simple in this way, it is easy to drive and is very effective in saving fuel and alleviating environmental deterioration caused by exhaust gas. Incidentally, since the half-clutch state and the release of the brake are linked, starting on a slope is extremely easy.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a perspective view showing the mechanical parts of this embodiment, and FIG. 3 is a diagram showing the principle of starting current interruption. 1...Battery, 2...Headlight, 21...Storage device
NOR ₁ to NOR ₄ , NOT ₅ to NOT ₈ , 22...Lighting and brake control circuit T ₃ , D ₁ , 23, 24, 2
5, 26, 27, 39...Engine control device NOR ₅ ,
T ₄ , 40, 41, 42, D ₃ , 49...Start control device NOR ₆ to NOR ₁₀ , NOT ₁₂ , T ₅ , 45, 44,
43, D ₅ .

Claims (1)

[Claims] 1 In a vehicle that is driven by the rotation of the engine on which it is driven via a clutch, when you apply the brakes to the vehicle and the vehicle stops, the setting state is reached, and you can stop applying the brakes and accelerate the engine. In addition, when the clutch is moved from a disengaged state to a half-clutched state, it returns to the reset state and maintains the reset state as long as the vehicle is running, and a brake control device that keeps the brakes applied when this memory device is in the set state. and an engine control device that does not allow the engine to continue rotating unless the storage device is in the setting state and the operation in the direction of increasing the clutch separation does not reach a certain position; and a start control device that starts the engine when the operation reaches the predetermined position and the engine is stopped.