JP2003155968A - Automatic starting system for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic starting system for an engine which smoothes restart of the engine using at least two batteries, and restrains the battery from being significantly degraded. SOLUTION: This automatic starting system A for the engine comprises the batteries 1, 2, a relay 3 for connecting the batteries 1, 2 in parallel or series, a starting generator 4 having a starter function of restarting the engine and a generating function of generating power driven by the engine, and a controller 5 for temporarily stopping the engine and restarting the engine by energizing the starting generator 4 when the command for starting the vehicle is made. While the engine is operating, the automatic starting system A for the engine charges the batteries 1, 2 with the starting generator 4 by parallel connection through the relay 3 based on the controller 5. When the command for starting the vehicle is outputted while the engine is under a temporary stopping condition, the batteries 1, 2 are switched from the parallel connecting side to the series connecting side by the relay 3 based on the controller 5, and restart the engine by supplying the series connecting voltage via the inverter 41 to the starting generator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine starting system for starting an engine and an automatic engine starting system for temporarily stopping the engine when the vehicle is stopped and restarting the engine with a starter for restarting when the vehicle starts.

[0002]

_2. Description of the Related Art In order to reduce the amount of CO ₂ produced by combustion, an engine automatic stop / start system has been recently attracting attention in which the engine is temporarily stopped when the vehicle is stopped and the engine is restarted by a starter when the vehicle is started. The battery that supplies power to the starter is charged by the alternator.

[0003]

However, the above conventional technique has the following problems. When operating the starter, power is supplied from the battery, but if engine restart is repeated, battery charging from the alternator may not be sufficient, and as a result, engine startability may deteriorate when starting the starter. .

It is also possible to provide an auxiliary battery in addition to the main battery in consideration of the repeated operation of the starter. In this case, if the main battery and the auxiliary battery have different capacities (for example, the auxiliary battery has a smaller capacity than the main battery), the alternator causes the auxiliary battery to have a higher charge when the main battery and the auxiliary battery are charged. There is a risk that it will be worn out.

Therefore, the present invention has been made in view of the above circumstances, and uses at least two batteries to smoothly restart the engine and to prevent the battery from significantly deteriorating. The purpose is to provide a starting system.

[0006]

The engine starting system has a starter function for starting the engine and a power generating function for charging the first and second batteries driven by the engine. And first and second batteries having the same electromotive force, connection switching means for connecting these batteries in parallel or in series, and control means for controlling the engine and the connection switching means.

When the engine is started, the connection switching means is connected in series on the basis of the control means, and a voltage is supplied to the starting generator for series connection to start the engine. During operation of the engine, the connection switching means is connected in parallel based on the control means, and the first and second batteries connected in parallel are charged by the starting generator.

Since the voltage in series connection is supplied to the starting generator when the engine is started, a large driving force can be produced by the high voltage, the engine can be started smoothly, and the first electromotive force of the same electromotive force can be obtained. Since the second battery is charged in parallel, it is possible to prevent one of the batteries from being significantly deteriorated.

In the automatic engine starting system, the starter for restarting the engine, the alternator driven by the engine to charge the first and second batteries, and the first and second electromotive forces are the same. Battery, connection switching means for connecting these batteries in parallel or in series, and temporarily stopping the running engine by stopping the vehicle, and energizing the starter when the vehicle start instruction is issued during the engine stop. And a control means for restarting the.

During operation of the engine, the alternator charges the first and second batteries connected in parallel by the connection switching means based on the control means. When an instruction to start the vehicle is issued while the engine is temporarily stopped, the connection switching means switches from the parallel connection side to the series connection side based on the control means, and the starter voltage is supplied to the starter to restart the engine. When the engine is restarted, the starter operates at the voltage when the first and second batteries are connected in series, so that the engine can be restarted smoothly and the first and second batteries having the same electromotive force are connected in parallel. Since it is charged, it is possible to prevent one of the batteries from deteriorating significantly.

In the automatic engine starting system, the first and second batteries having the same electromotive force, the connection switching means for connecting these batteries in parallel or in series, and the engine in suspension are re-activated. A starter generator having a starter function for starting and a power generating function for charging the first and second batteries, which is driven by the engine, and the engine being driven is temporarily stopped by stopping the vehicle, and the vehicle is started while the engine is temporarily stopped. When an instruction is issued, the control unit has a control unit that energizes the starting generator to restart the engine.

While the engine is operating, the connection switching means is connected in parallel based on the control means to charge the first and second batteries by the starting generator. When an instruction to start the vehicle is issued while the engine is temporarily stopped, the connection switching means switches from the parallel connection side to the series connection side based on the control means, and the voltage at the time of series connection is energized to the starting generator through the inverter and the engine is turned on. Restart. When the engine is restarted, the starter generator operates at the voltage when the first and second batteries are connected in series, so that the engine can be restarted smoothly and the delay in starting the vehicle can be prevented.

When the engine is restarted, the voltage when connected in series is supplied to the starting generator through the inverter, and when the engine is operating, the first and second batteries connected in parallel are charged by the starting generator. And the alternator can be shared by a single starter generator, and the first and second batteries of the same electromotive force are charged in parallel, preventing one of the batteries from significantly deteriorating. it can.

(Regarding Claim 4) The control means includes the first,
When the electric capacity of the second battery is less than or equal to a set value, or when the engine stop determination condition is not satisfied (for example,
When the door is open, the air conditioner has a large capacity, the engine coolant temperature is out of the specified range, the blinker blinks, and the vehicle is on a steep slope, it is prohibited to stop the engine due to the vehicle stopping. This allows
If the battery's electric capacity is extremely low, or if the engine is temporarily stopped, the battery will be overloaded,
When a smooth start is required, the engine is not temporarily stopped, so the battery can be prevented from running out and safety can be ensured.

(Claim 5) The electric load mounted on the vehicle is connected by any of the following (1) to (3). (1) When electrically connecting an in-vehicle electric load to the first battery that is located on the ground side and that can always obtain a voltage when connected in parallel.
While the engine is temporarily stopped or the engine is operating, electric power is supplied from the first and second batteries connected in parallel to the electric load mounted on the vehicle. During engine restart, power is supplied from the first battery to the vehicle-mounted electric load. Further, during engine operation, the first and second batteries connected in parallel are charged by the alternator or the starter generator.

(2) When electrically connecting from one end of the first battery to a power supply line to which a diode for supplying a battery voltage when switching the connection switching means is connected. While the engine is operating or the engine is temporarily stopped, electric power is supplied from the first and second batteries connected in parallel to the electric load mounted on the vehicle.
Further, during engine operation, the first and second batteries connected in parallel are charged by the alternator or the starter generator.

When the engine is restarted, the first and second batteries are connected in series, and a voltage is applied to the vehicle-mounted electric load when connected in series, but the starter for restarting or the starting generator consumes a large current. There is no problem because the voltage has dropped below the rated voltage of the electrical load (one battery voltage or less).

Further, when the connection switching means is switched during the transition from the temporary stop of the engine to the restart of the engine, normally, the voltage of the power supply line instantaneously becomes 0V. However, since a diode is connected between one end of the first battery and the power supply line to supply the battery voltage to the power supply line via the diode, the battery voltage is supplied to the vehicle-mounted electric load without interruption. .

(3) One end of the overvoltage prevention resistor is connected to the power supply line, and a relay contact that is opened only while the connection switching means is in series connection of the battery is connected to both ends of the overvoltage prevention resistor to connect the first battery. When connecting the diode that supplies the battery voltage from one end to the other end of the overvoltage prevention resistor and then connect it to this other end.

While the engine is running or the engine is temporarily stopped,
The voltage at the time of parallel connection of the power supply lines is supplied to the vehicle-mounted electric load via the relay contact being closed. Further, during engine operation, the first and second batteries connected in parallel are charged by the alternator or the starter generator.

When the connection switching means is switched during the transition from the temporary stop of the engine to the restart of the engine, the voltage of the power supply line normally becomes 0V instantaneously. However, since the diode that supplies the battery voltage from one end of the first battery is connected to the other end side of the overvoltage prevention resistor, the battery voltage is supplied to the vehicle-mounted electric load without interruption.

Since the relay contact is opened during engine restart, the voltage when the power supply line is connected in series is applied to the electric load mounted on the vehicle through the overvoltage prevention resistor, so that an excessive voltage exceeding the rated voltage of the electric load is applied. Does not apply to the electric load.

[0023]

1 is a block diagram of an automatic engine starting system A (corresponding to claims 3 and 5) according to a first embodiment of the present invention.
And it demonstrates based on FIG. The automatic engine starting system A includes a battery 1 and a battery 2 connected in parallel.
It has a relay 3 for switching the series, an inverter 41 and a starter generator 4, and a controller 5 for instructing temporary stop and restart of the engine.

Then, one end 62 of a resistor 61 (overvoltage prevention resistor) of about 0.5Ω is connected to the power supply line 20, and the relay 6
Connect the normally closed contacts 63 of both ends of the resistor 61 to the battery 1
The anode 66 of the diode 65 is connected to the positive electrode 11 of the above, and the cathode 67 is connected to the other end 64 of the resistor 61. In addition, 7 is a starter for normal starting, 70 is a relay,
Reference numeral 71 is a normally open contact of the relay 70, 8 is an electric load, and 81 is its switch.

The battery 1 is a lead storage battery having an electromotive force of 12 V, and the negative electrode 12 (the other end) is connected to the vehicle body. The battery 2 is a lead storage battery having an electromotive force of 12 V, and the positive electrode 21 is electrically connected to the power supply line 20.

The relay 3 has an electromagnetic coil 31, normally closed contacts 32 and 33, and normally open contacts 34 and 35. When the drive output is not sent from the controller 5 to the electromagnetic coil 31, the normally closed contacts 32 and 33 maintain the closed state, and the normally open contacts 34 and 35 maintain the open state (when the batteries are connected in parallel). Further, when a drive output is sent from the controller 5 to the electromagnetic coil 31, it is excited and the normally closed contacts 32 and 33 are opened, and the normally open contacts 34 and 35 are closed (when the batteries are connected in series).

The starter / generator 4 has a starter function for restarting the temporarily stopped engine and a power generating function for driving the engine to generate electric power. When the engine is restarted, the voltage when connected in series is supplied to the starting generator 4 via the inverter 41. Further, when the engine is operating, the generated power is supplied to the power supply line 20, and the batteries 1 connected in parallel are
Charge 2

The controller 5 has a microcomputer, and in addition to the temporary stop and restart of the engine, the relays 3 and 6 are also provided.
The energization of the electromagnetic coils 31 and 60 is controlled.

Next, the operation of the automatic engine starting system A will be described with reference to the flow chart shown in FIG.
When the vehicle is parked in a garage or the like and the engine is stopped, the driver turns the engine key 82 from the OFF position to the ACC position, the ON position 83, and the ST position 84 (YES in step s1).

As a result, the relay 70 is actuated, the normally open contact 71 is closed, the magnet switch 72 is closed, the starter 7 for normal starting is energized, and the engine is started by the starter 7 ( Step s2).

Looking at the timing, when the driver returns the engine key 82 from the ST position 84 to the ON position 83, the energization of the relay 70 is stopped and the normally open contact 71 is returned to the open state.
The magnet switch 72 is opened and the power supply to the starter 7 for normal starting is stopped.

When the engine is stopped-when the engine is first started-
The controller 5 does not energize the relays 3 and 6 during the engine operation to the engine temporary stop. Therefore, relays 3 and 6
The normally-closed contacts 32, 33, 63 maintain the closed state, the batteries 1 and 2 are connected in parallel, and the voltage at the time of parallel connection is supplied to the power supply line 20. In these cases, when the switch 81 is closed, the voltage at the time of parallel connection is mainly supplied from the power supply line 20 to the electric load 8 via the normally closed contact 63. During engine operation, the electric power generated by the starting generator 4 charges the batteries 1 and 2 connected in parallel via the power supply line 20.

In step s3, it is determined whether or not the engine temporary stop instruction is issued. If the engine temporary stop instruction is issued (YES), the process proceeds to step s4, and if the engine temporary stop instruction is not issued. Wait (NO).

For example, when the vehicle is once stopped due to a red signal or the like, the conditions of zero vehicle speed, accelerator off, and brake pedal stroke are satisfied. In this case,
It is determined that an engine stop instruction has been issued.

In step s4, the controller 5 gives an instruction to temporarily stop the engine (stop fuel injection), and the engine is temporarily stopped.

In step s5, it is determined whether or not a start instruction has been issued, and if a start instruction has been issued (YES).
In step s6, if the start instruction is not issued (NO), the process returns to step s4 to continue the engine temporary stop.

For example, when the signal turns blue and the driver releases his / her foot from the brake pedal, the brake pedal stroke becomes zero, so it is determined that an instruction to start the vehicle has been issued.

In step s6, the controller 5 energizes the relay 6 to open the normally closed contact 63 of the relay 6.
It should be noted that the disconnection of power to the relay 3 is continued for several ms. During this several ms, the voltage obtained by dropping the voltage in parallel connection from the power supply line 20 through the resistor 61 is supplied to the electric load 8.
Also. The voltage of the battery 1 is supplied to the electric load 8 via the diode 65.

In step s7, the controller 5 also energizes the relay 3 to switch the batteries 1 and 2 to parallel connection. The relay 6 continues to be energized.

Simultaneously with the energization of the relay 3, the controller 5 outputs a drive signal to the inverter 41, and the voltage in series connection is energized to the starter generator 4 via the inverter 41. The power supply line 20 dropped due to the operation of the starting generator 4
When connected in series, the voltage is supplied to the electric load 8 via the resistor 61. The voltage of the power supply line 20 becomes zero during the switching time of each contact of the relay 3, but there is no problem because the voltage of the battery 1 is supplied to the electric load 8 via the diode 65.

The engine restart is completed (step s
8) and in step s9, the controller 5 stops energizing the relay 3 and returns the batteries 1 and 2 to the parallel connection. In order to prevent excessive voltage supply, energization of the relay 6 is continued for several ms. During a few ms including the switching time of the relay 3, the voltage of the battery 1 is supplied to the electric load 8 via the diode 65.

In step s10, the controller 5 stops energizing the relay 6 and the process returns to step s3. It should be noted that the disconnection of electricity to the relay 3 is maintained. At this point, the normally closed contacts 32, 33, 63 of the relays 3, 6 are closed,
The batteries 1 and 2 are connected in parallel, and the power supply line 20 is supplied with the voltage when connected in parallel.

When the switch 81 is closed,
Mainly, the voltage at the time of parallel connection is supplied from the power supply line 20 to the electric load 8 via the normally closed contact 63. Further, the electric power generated by the starter generator 4 charges the batteries 1 and 2 connected in parallel via the power supply line 20.

Automatic engine starting system A of this embodiment
Has the following advantages: [A] When the engine is restarted, via the inverter 41,
Since the voltage when the batteries 1 and 2 are connected in series is supplied to the starter generator 4, a large driving force can be produced. This allows the engine to be restarted smoothly,
The delay in starting the vehicle can be prevented.

[A] When the engine is restarted, the voltage when the batteries 1 and 2 are connected in series is applied to the starting generator 4 through the inverter 41, and when the engine is operating, the batteries 1 and 2 connected in parallel are started. Since it is configured to be charged by one, the starter and the alternator can be shared by one starter-generator 4, and the batteries 1 and 2 of the same electromotive force are charged in a parallel connection state. It is possible to prevent the battery from significantly deteriorating.

[C] When the relay 3 is switched during the transition from the engine temporary stop to the engine restart, normally, the voltage of the power supply line 20 instantaneously becomes 0V. However, since the diode 65 that supplies the battery voltage from the positive electrode 11 of the battery 1 is connected to the other end side 64 of the resistor 61, the battery voltage is supplied to the vehicle-mounted electric load 8 without interruption.

During engine restart, the normally closed contact 63
Is open, the voltage is a resistance of 6 when the power supply line 20 is connected in series.
Since it is applied to the on-vehicle electric load 8 via
An excessive voltage that exceeds the rated voltage of is not applied to the electric load 8.

Next, an engine automatic starting system B (corresponding to claims 3 and 5) according to a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. The engine automatic starting system B is
The following points are different from the engine automatic start system A.

In this embodiment, the relay 6 and the resistor 61 are omitted. Then, the electric load 8 is passed through the switch 81.
Is directly connected to the power supply line 20, and the diode 65 for supplying a battery voltage when the relay 3 is switched from the positive pole 11 of the battery 1 is connected to the power supply line 20.

The automatic engine starting system B is different from the automatic engine starting system A in the following points.
When the start instruction is issued while the engine is stopped, the controller 5
Outputs a drive signal to the inverter 41 and at the same time energizes the relay 3 to switch the batteries 1 and 2 to series connection.

The voltage when the batteries 1 and 2 are connected in series, which is dropped by the operation of the start-up generator 4, is supplied to the electric load 8. The voltage of the power supply line 20 becomes zero during the switching time of each contact of the relay 3, but the voltage of the battery 1 is supplied to the electric load 8 via the diode 65, so that the electric load does not go down.

When the engine restart is completed, the controller 5 stops energizing the relay 3 and returns the batteries 1 and 2 to the parallel connection. In order to prevent excessive voltage supply, the drive of the inverter 41 is stopped after the energization of the relay 3 is stopped.

At the time when the power supply to the relay 3 is stopped, the normally closed contacts 32 and 33 of the relay 3 are closed, the batteries 1 and 2 are connected in parallel, and the voltage at the time of parallel connection is supplied to the power supply line 20. To be done.

Then, the voltage at the time of parallel connection is supplied to the electric load 8 mainly from the power supply line 20 via the switch 81.
Further, the electric power generated by the starter generator 4 is supplied to the power supply line 20 to charge the batteries 1 and 2 connected in parallel.

Automatic engine starting system B of this embodiment
Has the following advantages in addition to the advantages according to the above [a] and [a]. [D] When the relay 3 is switched during the transition from the engine temporary stop to the engine restart, normally, the voltage of the power supply line 20 instantaneously becomes 0V. However, since the diode 65 that supplies the battery voltage from the positive electrode 11 of the battery 1 is connected to the power supply line 20, the battery voltage is supplied to the vehicle-mounted electric load 8 without interruption.

When a start instruction is issued while the engine is temporarily stopped, the controller 5 outputs a drive signal to the inverter 41, and at the same time energizes the relay 3, the start generator 4
The voltage at the time of series connection by the batteries 1 and 2 dropped by the operation of is supplied to the electric load 8. Then, when the engine restart is completed, the drive of the inverter 41 is stopped after the power supply to the relay 3 is stopped. For this reason, it is possible to prevent power supply with an excessive voltage, and to prevent an excessive voltage from exceeding the rated voltage from being applied to the vehicle-mounted electric load 8.

Next, an automatic engine starting system C (corresponding to claims 2 and 5) according to the third embodiment of the present invention will be described with reference to FIG.
It will be described based on. The engine automatic start system C
The following points are different from the engine automatic start system A.

In this embodiment, an alternator 91 and a restarting starter 92 are used instead of the inverter 41 and the starter / generator 4. Further, the relay 6 and the resistor 61 are omitted, and the electric load 8 is directly connected to the power supply line 20 via the switch 81. A diode 65 for supplying a battery voltage when the relay 3 is switched from the positive pole 11 of the battery 1 is connected to the power supply line 20.

The automatic engine starting system C is different from the automatic engine starting system A in the following points.
When the start instruction is issued while the engine is stopped, the controller 5
Outputs a drive signal to the drive coil 94 of the relay 93 and at the same time energizes the relay 3 to switch the batteries 1 and 2 to series connection.

The voltage at the time of series connection by the batteries 1 and 2 dropped by the operation of the starter 92 for restarting is supplied to the electric load 8. The voltage of the power supply line 20 becomes zero during the switching time of each contact of the relay 3, but the voltage of the battery 1 is supplied to the electric load 8 via the diode 65 without interruption.

When the engine restart is completed, the controller 5 stops energizing the relay 3 and returns the batteries 1 and 2 to the parallel connection. In order to prevent excessive voltage supply, the output of the drive signal to the drive coil 94 is stopped after the energization of the relay 3 is stopped.

When the power supply to the relay 3 is stopped, the normally closed contacts 32 and 33 of the relay 3 are closed, the batteries 1 and 2 are connected in parallel, and the voltage at the time of parallel connection is supplied to the power supply line 20. To be done.

Then, the voltage at the time of parallel connection is supplied to the electric load 8 mainly from the power supply line 20 through the switch 81.
The electric power generated by the alternator 91 is supplied to the power supply line 20 to charge the batteries 1 and 2 connected in parallel.

Automatic engine starting system C of this embodiment
Has the following advantages: [E] When the engine is restarted, the voltage at the time of series connection by the batteries 1 and 2 is supplied to the restarter 92 for restarting, so that a large driving force can be produced. As a result, the engine can be restarted smoothly and the delay in starting the vehicle can be prevented.

[F] When the relay 3 is switched during the transition from the engine temporary stop to the engine restart, normally, the voltage of the power supply line 20 instantaneously becomes 0V. However, since the diode 65 that supplies the battery voltage from the positive electrode 11 of the battery 1 is connected to the power supply line 20, the battery voltage is supplied to the vehicle-mounted electric load 8 without interruption.

When a start instruction is issued while the engine is temporarily stopped, the controller 5 outputs a drive signal to the drive coil 94 of the relay 93 and at the same time energizes the relay 3 to turn on the batteries 1 and 2. The voltage is switched to the series connection, and the voltage at the time of series connection by the batteries 1 and 2 dropped by the operation of the starter 92 for restarting is supplied to the electric load 8. When the engine restart is completed, the energization of the relay 3 is stopped, the batteries 1 and 2 are returned to the parallel connection, and then the drive output of the relay 93 to the drive coil 94 is stopped. As a result, it is possible to prevent the supply of excessive voltage to the electric load 8.

The present invention includes the following embodiments in addition to the above embodiments. a. The engine starting system includes first and second batteries having the same electromotive force, the first and second batteries electrically connected to each other, and a starter function for starting the engine and driving by the engine. A starting generator having a power generation function for charging the battery, a connection switching unit for connecting the first and second batteries in parallel or in series, and a control unit for controlling the engine and the connection switching unit,
When the engine is started, the connection switching means is connected in series based on the control means to supply power to the starting generator to start the engine, and during engine operation, the connection switching means is connected in parallel based on the control means to start the generator. It may be configured to charge the first and second batteries (corresponding to claim 1).

B. During engine operation, when the ground side battery voltage is below the set value (when the electric capacities of the first and second batteries are below the set value), when the door is open, the air conditioner has a large capacity state, and the engine cooling water temperature is at a predetermined level. The control means may prohibit the engine from being temporarily stopped when the vehicle is out of the range, when the blinker is blinking, or when the vehicle is suddenly stopped on a slope (when the condition for determining that the engine is temporarily stopped is not satisfied). Correspondence). As a result, the engine will not be temporarily stopped if the electric capacity of the battery is extremely low, if the engine is temporarily stopped, the battery will be overloaded, or if a smooth start is required. Can be prevented and safety can be secured.

C. The electric load of the vehicle is located on the ground side,
It may be electrically connected to a battery that always obtains a voltage when connected in parallel (corresponding to claim 5).

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an engine automatic start system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the automatic engine starting system.

FIG. 3 is an explanatory diagram of an engine automatic start system according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of an engine automatic start system according to a third embodiment of the present invention.

[Explanation of symbols]

A, B, C engine automatic start system 1 battery (first battery) 2 battery (second battery) 3 relays (connection switching means) 4 starter generator 5 Controller (control means) 7 Starter 11 Positive pole (one end of the first battery) 20 power lines 41 inverter 61 Resistance (Overvoltage prevention resistance) 62 one end 63 Normally closed contact (relay contact) 64 other end 65 diode 91 Alternator

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02D 45/00 314 F02D 45/00 314S F02N 11/04 F02N 11/04 A 15/00 15/00 E (72) Invention Mikio Saito 1-1, Showa-cho, Kariya city, Aichi Stock company DENSO F-term (reference) 3G084 BA28 CA01 CA05 CA07 DA09 FA05 FA06 FA10 3G092 AC03 CA01 DF05 DG08 EA11 EA27 FA30 FA31 FA32 FA43 GA01 GA10 GB01 GB08 HF02HF02 HF02 HF26Z 3G093 BA21 BA22 CA01 CA02 CB05 DA06 DB05 DB15 DB19 EB09 EC02

Claims (5)

[Claims] 1. A first battery and a second battery having the same electromotive force, and a starter function for electrically starting the engine, the starter function for starting an engine, and the first battery, driven by the engine. A starter / generator having a power generation function for charging a second battery, a connection switching unit for connecting the first and second batteries in parallel or in series, and a control unit for controlling the engine and the connection switching unit. An engine starting system comprising: a control means, which is connected in series by the connection switching means based on the control means to supply power to the starter generator to start the engine; Based on the above, the engine is characterized in that the first and second batteries are charged by the starting generator by connecting them in parallel by the connection switching means. Stem. 2. A first battery, a second battery having the same electromotive force, a starter for electrically starting the first battery, the second battery electrically starting the engine, and a starter for starting the engine. An alternator for charging the first and second batteries; a connection switching means for connecting the first and second batteries in parallel or in series; and temporarily stopping the engine in operation by stopping the vehicle,
An engine automatic starting system having a control means for energizing the starter to restart the engine when an instruction to start the vehicle is issued while the engine is temporarily stopped, the connection being based on the control means during engine operation. When the switching means is connected in parallel and the alternator charges the first and second batteries, and when an instruction to start the vehicle is issued while the engine is temporarily stopped, the connection switching means is connected in parallel based on the control means. To the series connection side to supply power to the starter to restart the engine. 3. A first battery and a second battery having the same electromotive force, connection switching means for connecting these batteries in parallel or in series, a starter function for restarting an engine that has been temporarily stopped, and a drive by the engine. A starting generator having a power generation function for charging the first and second batteries, and temporarily stopping the engine in operation by stopping the vehicle,
An engine automatic starting system comprising: a control unit that energizes the starting generator to restart the engine when an instruction to start the vehicle is issued while the engine is temporarily stopped. When the first and second batteries are connected in parallel by the connection switching means to charge the first and second batteries by the start-up generator and an instruction to start the vehicle is issued while the engine is temporarily stopped, the connection switching means is based on the control means. The automatic engine starting system is characterized in that the switching from the parallel connection side to the series connection side is performed, and the voltage at the time of series connection is energized to the starting generator through the inverter to restart the engine. 4. The control means temporarily stops the engine by stopping the vehicle when the electric capacities of the first and second batteries are equal to or less than a set value or when the engine temporary stop determination condition is not satisfied. The automatic engine starting system according to claim 2 or 3, wherein the automatic engine starting system is prohibited. 5. An in-vehicle electric load is electrically connected to the first battery, which is located on the ground side and always obtains a voltage in parallel connection, or switching of the connection switching means from one end of the first battery. A relay contact that is electrically connected to a power supply line to which a diode for supplying battery voltage is sometimes connected, or one end of an overvoltage prevention resistor is connected to the power supply line, and is opened only while the connection switching means makes the battery connection in series. Is connected to both ends of the overvoltage prevention resistor, a diode for supplying a battery voltage from one end of the first battery is connected to the other end side of the overvoltage prevention resistor, and is connected to this other end side. The automatic engine starting system according to claim 2.