JPH0127944Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on an automatic transmission that has a gear unit in series that does not transmit power when the fluid converter and shift lever are in the neutral position due to the rotation of the engine, such as in a car. This relates to vehicles that run.

With conventional systems, restarting the engine once the engine was stopped required a new key switch operation, which was a hassle, so it was customary not to stop the engine even if the waiting time at a traffic light was long. This wastes fuel and generates excess exhaust gas, resulting in disadvantages that are economically and environmentally undesirable.

In order to eliminate such drawbacks, this invention aims to provide an automatic engine stop and restart device that automatically stops and restarts the engine in conjunction with the operation of stopping and restarting the vehicle. do.

This invention is based on the above-mentioned vehicle, and when the vehicle is braked and the vehicle stops, the set state is entered, and when the brake is not applied, the engine is accelerated, and the shift lever is moved to the drive position, it returns to the reset state. A memory device that maintains the reset state as long as the vehicle is running, and a brake control device that keeps the brake applied when the memory device is in the set state, and when the memory device is in the set state and the shift lever is An engine control device that does not allow the engine to continue rotating when the shift lever is in the neutral position and no operation is being performed to accelerate the engine, and an engine control device that starts the engine when the shift lever is in the neutral position and no operation is being performed to accelerate the engine and the engine is stopped. This is an automatic engine stop/restart device when the engine is stopped and restarted, which is equipped with a start control device that causes the engine to stop and restart.

Next, this invention will be explained with reference to an embodiment whose circuit is shown in FIG. The battery 1 near the bottom right of the figure is connected to the alternator 35 (third
(Figure), and the negative electrode is connected to the vehicle body.

Terminal B of key switch 2 near the upper right of the figure is connected to the positive terminal of battery 1, and when the handle (not shown) is turned counterclockwise in three steps, terminal B is connected to terminals ACC, ACC, IG, 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. After the engine starts, the handle turns slightly to the right to cut off continuity between B and ST.

The primary side of the ignition coil of the ignition device 3 is inserted between the terminal IG and the vehicle body.

A starting motor 4 is inserted between the positive electrode of the battery 1 and the vehicle body via a normally open starting relay switch 5, and a starting relay coil 6, which closes the starting relay switch 5 when energized, is connected to a terminal ST. It is inserted between the vehicle body.

The vehicle stop sensor 7 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. It allows one side to be maintained.

Alternatively, as the vehicle stop sensor 7, the ferromagnetic plates driven by the drive shaft may be cut out alternately near the outer edge, and the permanent magnet and reed switch may be placed between these portions.

Also, a Hall element may be used in place of the reed switch.

The vehicle stop identification circuit 8 includes resistors r ₁ to r ₈ and a capacitor.
C ₁ to C ₃ , transistors T ₁ , T ₂ , and knot elements
NOT ₁ is connected as shown in the diagram, and it is interposed between the IG terminal and the vehicle body, and when the reed switch of the vehicle stop sensor 7 opens or closes (the vehicle is running), it outputs a high potential, and the reed switch When it continues to open or close (the vehicle is stopped), it outputs a low potential. Hereinafter, the level of potential will be expressed as 1 or 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 ₃ and T ₁ is cut off, there is no voltage on r ₅ 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, NOT ₁ input is 0, output is 1
becomes.

Since the charging and discharging of C ₂ and C ₃ takes time because the resistors r ₅ and r ₆ are also involved, the output potential changes after a certain period of time when the vehicle stops and restarts.

The brake switch 9 shown below the vehicle stop sensor 7 closes only when the brake pedal is depressed to apply the brakes. Open when releasing the pedal.

The receiving circuit 10 includes resistors r ₉ and r ₁₀ connected at a point P.
One end of the series connection _R9 is connected to the terminal IG, the other end _R10 is connected to the vehicle body via the brake switch 9, the point P is connected to the vehicle body via the capacitor _C4 , and the Schmitt actuated delay circuit _Sch1 is connected in series. It is connected to the setting input end 1 of the storage device described below through the
becomes 1 when it conducts to terminal B and the power is turned on,
The potential at the output end of Sch ₁ becomes 1 with a little delay. When the brake switch 9 is closed, the potential at point P becomes 0, and the potential at the output end of Sch ₁ becomes 0 with a little delay.
When the brake switch 9 opens, the change is opposite to the above. C ₄ and Sch ₁ function to remove power supply noise and prevent switch chatter.

An acceleration switch 11 shown below the brake switch 9 is closed only during acceleration operation.

The receiving circuit 12 has resistors r ₁₁ , r ₁₂ ,
Capacitor C ₅ , Schmitt actuated delay circuit Sch ₂
are connected in the same relationship as the terminal IG, switch 11, resistors r ₉ and r 10 centered on the point P between the vehicle body and the receiver circuit ₁₀ , the capacitor C ₄ , and the relationship of the delay circuit Sch ₁ to the terminal IG and switch 9. Something,
The change in potential at the output end of Sch ₂ when the acceleration switch 11 is closed and opened is the same as when the brake switch 9 of the receiving device 10 is closed and opened.
This is similar to the change in potential at the output end of Sch ₁ . The functions of removing power supply noise and preventing switch chatter are also similar.

Reset circuit 13 shown above receiving circuit 12
, the point R is connected to the terminal IG through the resistor _r13 , to the vehicle body through the capacitor _C6 , and to the return input terminal ₁ of the storage device described later through the Schmitt actuated knot element NOT2. When input, the potential at the output terminal of NOT ₂ is first set to 1 and then to 0. At this time, the specifications of r ₁₃ , C ₆ , etc. are determined so that the potential becomes 0 later than the potential at the output terminals of Sch ₁ and Sch ₂ .

Neutral switch 1 shown below acceleration switch 11
4 is closed only when the shift lever is in the neutral position (open in the driving range).

The receiving circuit 15 has resistors r ₁₄ , r ₁₅ ,
The capacitor C ₇ and the NOT element NOT ₃ are connected to the terminal IG, the switch 14 and the point P on the vehicle body and the receiving device 10.
Resistors _{r 9 and} r ₁₀ centered at
The potential at the output terminal of NOT ₃ is 1 and 0 when it is closed and open, respectively.

The storage device 16 stores NOT ₁ of the vehicle stop identification circuit 8.
A NOR circuit NOR ₁ is provided which receives the output of Sch ₁ of the receiving circuit 10 and the output of Sch 1 of the receiving circuit 10 as input.
NOR circuit that receives each output of 2 and 15 as input
An OR circuit OR ₁ is provided which receives the output of NOT ₁ , _the output of the NOR circuit NOR ₂ , and the output of _{NOT 2} of the reset circuit 13 as inputs _. An R-S flip-flop FF ₁ is provided which receives the output of NOT at its reset input terminal, its output terminal 1 is set as one output terminal of this storage device 16, and this is connected to the input terminal of NOT element NOT ₆ to output its output terminal. is the other output terminal of this storage device 16.

If the vehicle is stopped, the brakes are not applied, the shift lever is in the neutral position, and the shift lever is in the neutral position
Turn terminal B to connect to ACC and IG),
The output of NOT ₁ is 0, and first, Sch ₁ , Sch ₂ ,
The output of NOT ₃ goes from 0 to 1, and after a little delay, NOT ₂
The output of changes from 1 to 0. Below, the potentials of multiple input terminals are shown sequentially from the upper input terminal to the lower input terminal in the diagram. At this time, the two inputs of NOR ₁ are 0, 0.
The output of NOR ₁ , that is, the setting input of FF ₁ changes from 1 to 0. NOR ₂ for this
The two inputs of will go from 0,1 to 1,1 and its output will be 0
Therefore, while the output of NOT ₂ is 1, the three inputs of OR ₁ remain 0, 1, 0, and the output, therefore, the return input of FF ₁ remains 1, and the storage device One output of 16 goes from 1 to 0, and the other output goes from 0 to 1. Next, when the output of NOT ₂ changes from 1 to 0, the three inputs of OR ₁ change from 0, 1, 0 to 0, 0, 0, and the return input of FF ₁ changes from 1 to 0, but the output does not change.

If the shift lever is moved to a position other than the neutral position without applying the brakes and an acceleration operation is performed, the neutral switch 14 opens and the acceleration switch 11 closes. As a result,
The output of Sch ₂ and NOT ₃ , that is, the input of NOR _2, is 0,
It becomes 0, and its output becomes 1. The other vehicle starts running and the output of NOT ₁ becomes 1. This results in
The two inputs of NOR ₁ are 1, 1, its output i.e. FF ₁
The configuration input of FF 1 remains 0, while the three inputs of OR ₁ are 1, 0, 1, and its output, ie, the return input of FF ₁ , goes from 0 to 1, but FF _1, ie, the storage device 16
The outputs of the two do not change (one output is 0 and the other output is 1). When the vehicle is running, brake switch 9, acceleration switch 11, neutral switch 14
Opening and closing does not affect the output of the storage device 16 at all. It is 1 of the input of OR ₁ . This is because the output of NOT ₁ is 1, so its output is always 1.

When the brake pedal is depressed, the brake is applied and the vehicle decelerates, the brake switch 19 is closed, and the output of Sch ₁ becomes 0. At this time, since no acceleration operation is being performed, the acceleration switch 11 is open, the output of Sch ₂ is 1, and the output of NOR ₂ is 0. When the vehicle stops in this state, the output of NOT ₁ becomes 0, so each input of NOR ₁ and OR ₁ becomes 0, the setting input of FF ₁ becomes 1, and the return input becomes 0. As a result, the outputs of the one and the other of the storage devices 16 become 1 and 0, respectively. This state will be referred to as the setting state of the storage device 16.

Next, while keeping the shift lever in a position other than neutral, release the brake pedal and accelerate.
The output of NOT ₃ remains 0, the output of Sch ₁ is 1, so the input of NOR ₁ is 0, 1, its output is 0, the output of Sch ₂ is 0, the input of NOR ₂ is 0, 0, its output is 1, the inputs of OR ₁ are 0, 0, 1, and its output is 1. Therefore, the setting input of FF ₁ is 0, the return input is 1, and the one output of the storage device 16 is 0, and the other output is 1. The output returns to 1. This state will be referred to as the recovery state of the storage device 16.

The one output terminal of the memory device 16 is connected to the base of an npn type transistor _T3 of the brake control device 17. The emitter of the transistor _T3 is connected to the vehicle body, the collector is connected to the terminal IG via the relay coil 18 for brake control, and a surge absorption diode _D1 is connected in parallel with the relay coil 18.
is provided. A normally open brake control relay switch 19 is provided which closes when the relay coil 18 is energized.

The brake control relay switch 19 includes an electromagnetic coil 21 that closes a separately provided brake lock valve 20.
A surge absorbing diode D ₂ is connected in series between the terminal IG and the vehicle body and in parallel with the electromagnetic coil 21 .

Here, the brake lock valve 20 is connected to the electromagnetic coil 2.
1, as shown in FIG. 2, it is pressurized via the brake pedal 22 and the wheel cylinder 2 is
Even if the hydraulic path 24 leading to the brake pedal 3 is cut off midway and the brake pedal 22 is taken off, the pressurized state is maintained and the braking state continues. In FIG. 2, 25 is a master cylinder that converts depression of the brake pedal 22 into hydraulic pressure, 26 is a pressure switch that closes with hydraulic pressure, 27 is an acceleration pedal, and 11 is an acceleration switch.

When the memory device 16 is in the reset state, that is, the one output is 0, the transistor _T3 is in the cutoff state and no current flows through the relay coil 18, and the brake control relay switch 19 is open as shown. Therefore, the brake lock valve 20 does not operate. When the memory device 16 is in the set state, ie, the one output is 1, the transistor _T3 becomes conductive, current flows through the relay coil 18, and the brake control relay switch 19 is closed. As a result, the brake lock valve 20 closes and the brake remains applied.

With the structure described above, when the vehicle is braked and the vehicle stops, the memory device 16 enters the setting state (one of the outputs becomes 1), and when the engine is accelerated and the shift lever is not in the neutral position, Returns to the recovery state (one of the outputs becomes 0),
The restored state is maintained as long as the vehicle is running. The brake control device 17 keeps the brakes applied only while the storage device 16 is in the set state. The following NOT ₄ , NOT ₅ , NOR ₃ , T ₄ , 29, 30,
D ₃ constitutes an engine control device 28 as a whole.

The NOR circuit NOR ₃ inverts the other output of the storage device 16 and the output of Sch ₂ of the receiver 12.
It receives as input the output of NOT ₄ and the output of NOT ₅ which is an inversion of the output of NOT ₃ of the receiving device 15, and therefore the storage device 16 is in the set state, the acceleration switch 11 is open, and the neutral switch is The output becomes 1 only while 14 is closed.

The output terminal of the NOR circuit NOR ₃ is connected to the base of an npn type transistor T ₄ . transistor
The emitter of _T4 is connected to the vehicle body, the collector is connected to terminal IG via a relay coil 29 for engine control, and a surge absorbing diode _D3 is provided in parallel with the relay coil 29. A normally closed engine control relay switch 30, which opens when the relay coil 29 is energized, is provided and is connected in series to a line connecting the primary side of the ignition coil of the ignition device 3 and the terminal IG. When the output of the NOR circuit NOR ₃ becomes 1, the transistor T ₄ becomes conductive, current flows through the relay coil 29, and the engine control relay switch 3
0 opens, the power supply to the ignition device 3 is stopped, and the engine is not allowed to continue rotating.

With this structure, the engine cannot continue to rotate only when the three states of the setting of the storage device 16, the open state of the acceleration switch 11, and the open state of the neutral switch 14 overlap.

That is, when the shift lever is in the driving position and the neutral switch 14 is open, in normal driving conditions, when you take your foot off the accelerator pedal 27 and depress the brake pedal 22, the acceleration switch 11 opens and the brake switch 9 closes. And the vehicle stopped,
As a result, the memory device 16 enters a set state which keeps the brake applied but the engine continues to rotate. In this case, slippage occurs in the fluid converter. When the shift lever is placed in the neutral position, the neutral switch 14
closes and the engine no longer continues to rotate.

However, when the shift lever is moved to the drive position and the neutral switch 14 is opened, or when the accelerator pedal 27 is depressed and the accelerator switch 14 is closed (if both occur, the storage device 1
6 is in the return state), the engine is in a state where it can continue to rotate. However, the engine cannot be started unless the starting motor 4 rotates.

Terminal B of key switch 2 does not conduct to terminal ST,
In order to enable the starting motor 4 to operate while only terminals IG and ACC are electrically connected, the terminal ST side of the starting relay coil 6 is connected via a normally open starting control relay switch 31. Start control relay coil 3 that is connected to terminal IG (or the positive electrode of battery 1) and closes start control relay switch 31 when energized.
2, one end is connected to the terminal IG, the other end is connected to the collector of a PNP type transistor _T5 , its emitter is connected to the vehicle body, and a surge absorption diode _D5 is installed in parallel with the start control relay coil 32. be.

When the base potential of the transistor _T5 is 1, the relay switch 31 is closed and the starting motor 4 is activated. The output end of the NOR circuit NOR ₄ described later is connected to this base. NOR ₄ , T ₅ , D ₅ , 31, 32
constitutes the starting control device 33.

Starting the engine is not necessary when the engine is rotating. Therefore, in order to identify this, as shown in FIG. 3 together with the controller 34, the potential at the neutral point N of the alternator 35, which generates electricity when the engine rotates for charging the battery 1 and other purposes, is different from when the engine is stopped. is at the same potential as the vehicle body, but when the engine is rotating, it is at a high potential.By utilizing this fact, the relay coil 36 and its current flow are connected to the relay coil 36, where a current flows or disappears depending on whether or not the engine is rotating. A normally closed relay switch 37 is provided which opens when the fluid flows. The receiving circuit 38 connects resistors r ₁₆ and r ₁₇ , a capacitor C ₈ , and a Schmitt actuated delay circuit Sch ₃ around point T.
The IC, the switch 37, and the vehicle body are connected in the same relationship as the relationship between the resistors r ₉ and r ₁₀ centered at the point P in the receiver 10, the capacitor C ₄ , the terminal IG of the delay circuit Sch ₁ , and the switch 9. , the change in potential at the output terminal of Sch ₃ when the engine is rotating and when it is stopped, and therefore when the switch 37 is closed and opened, is determined by the receiving device 10.
This is similar to the change in potential at the output terminal of Sch ₁ when the brake switch 9 is closed or opened. Receiving circuit 38
_The Sch _{3 output of}
A NOR circuit NOR ₄ is provided which receives the output of the transistor T 5 as input, and its output terminal is connected to the base of the transistor T ₅ .

When the neutral switch 14 is open (the automatic transmission is in the driving range), when the acceleration switch 11 is open (no acceleration operation is being performed), and when the switch 37 is open (the engine is running) In either case, any of the three inputs of NOR ₄ is 1.
Since its output is 0, the starting motor 4 does not operate.

Neutral switch 14 is closed (automatic transmission is in neutral state), acceleration switch 11 is open (acceleration operation is being performed), and switch 37 is closed (engine is stopped). When the conditions overlap, the three inputs of NOR ₄ become 0, 0, 0, and its output becomes 1, the switch 31 closes, current flows to the starting motor 4, and the engine starts. As a result, the switch 37 opens, the output of Sch ₃ of the receiving circuit 38 becomes 1, that is, the 3 inputs of NOR ₄ become 0, 0, 1, the output becomes 0, the switch 31 opens,
Current no longer flows to the starting motor 4. At this time, the acceleration switch 11 is closed and the output of Sch ₂ is 0,
The output of NOT ₄ is 1, therefore the output of NOR ₃ is 0, and the engine control relay switch 30 remains closed, allowing the engine to run on its own.

According to this invention, while the vehicle is running, when the accelerator pedal 27 is released and the brake pedal 22 is depressed to apply the brakes and the vehicle stops, the brake is automatically kept in the applied state and prevents the vehicle from sticking out during a temporary stop. Not only is this possible, but the engine will also stop if necessary by moving the shift lever to the neutral position, as the stopping time will be longer.Moreover, when restarting, the engine will be stopped by moving the shift lever to the drive position and pressing the accelerator pedal 2.
When you press step 7, the engine automatically starts, the brakes are automatically released, and the vehicle starts.

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.

Furthermore, since the operation of shifting the shift lever to the neutral position and the acceleration operation are linked to the release of the brake, starting on a slope is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one embodiment of this invention, FIG. 2 is a perspective view showing the mechanical parts of this embodiment, and FIG. 3 is a circuit diagram of an alternator connected to the circuit of FIG. 1. 16... Storage device NOR ₁ , OR ₁ , FF ₁ , NOT ₆ ,
17... Brake control device T ₃ , D ₁ , 18, 19,
28... Engine control device NOT ₄ , NOT ₅ , NOR ₃ ,
T ₄ , 29, 30, D ₃ , 38...Start control device
NOR ₄ , T ₅ , 31, 32, D ₅ .

Claims (1)

[Scope of utility model registration request] In a vehicle that is driven by an automatic transmission that has a gear unit in series that does not transmit power when the fluid converter and shift lever are in the neutral position due to the rotation of the engine on board, when the brakes are applied to the vehicle and the vehicle is When the vehicle stops, it enters the set state, and when you stop applying the brakes, accelerate the engine, and move the shift lever to the drive position, it returns to the reset state and maintains the reset state as long as the vehicle is running. A brake control device is provided that keeps the brake applied when the brake is in the setting state, and further, when the storage device is in the setting state, the shift lever is in the neutral position, and there is no operation to accelerate the engine, the brake control device keeps the brake applied. Automatic engine stop/restart when the engine stops and restarts, which is equipped with an engine control device that prevents the engine from continuing, and a start control device that accelerates the engine when the shift lever is in the neutral position and starts the engine when the engine is stopped. Device.