JP2000257539A - Start controller for engine for motor vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a start controller for an engine for a motor vehicle capable of reducing impossibility of start due to dead battery and achieving secure engine start while improving fuel consumption greatly. SOLUTION: This start controller for an engine for a motor vehicle is provided with a start machine selection means 71 selecting at least either of an alternate current rotation electric motor 1 capable of starting the engine by receiving the supply of power converted from direct current to alternate current by an inverter 3 connected with a high voltage battery 5 and a direct current electric motor 2 capable of starting the engine by receiving the supply of power from a low voltage battery 6 based on the condition of at least either of the batteries 5, 6 and the engine when it receives an engine start command signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle engine start control device and a vehicle engine start device.

[0002]

2. Description of the Related Art Conventionally, as an engine starting device, an unnecessary fuel consumption is eliminated to improve a fuel consumption rate by stopping an engine when the vehicle is temporarily stopped and starting the engine when the vehicle starts. , Tokiko Sho 62-214
No. 4 is known. In this engine starter, an AC rotating electric machine integrating the functions of an alternator and a starter (motor) is used as a starter of the engine.

[0003] An AC rotating electric machine is connected to a battery via a DC-AC converter capable of converting electric power from DC to AC and from AC to DC. When operating the AC rotating electric machine as a starter, the DC power of the battery is converted to AC power in a DC-AC converter,
Supplied to the AC rotating electric machine. When the AC rotating electric machine is operated as an alternator, the AC power generated by the AC rotating electric machine is converted into DC power by a DC-AC converter and then charged into a battery.

[0004] In the engine starter using the AC rotating electric machine, in addition to the effect of improving fuel efficiency, there is no problem of wear of the pinion gear or the ring gear in the starter motor, so that the durability and the noise are reduced. Problems were also reduced.

[0005]

By the way, the starting torque required for starting the engine greatly depends on the temperature of the engine. That is, when the engine temperature is low,
A high starting torque is required due to the high viscosity of the engine oil. Further, when the temperature of the engine is extremely high, the air in the engine cylinder has a high pressure, so that the riding torque for compressing the air also increases.

FIG. 3 is a diagram showing the relationship between the engine speed at the time of engine startup by the AC rotating electric machine and the current (inverter current) flowing through the DC-AC converter. In FIG. 3, the solid line is for normal engine automatic start control (when the engine coolant temperature is about 30 ° C. to 85 ° C.), and the broken line is for when the engine temperature is low, such as when the engine is first started. As shown in FIG. 3, when the engine temperature is low, for example, when the engine is started for the first time, the initial current (lock current) required when the stopped crankshaft starts to move beyond the static friction force is extremely large, and is 200 to 300 A. Becomes Even when the engine is hot, as described above, the torque required for starting is large, so that the lock current becomes large as in the case of cold engine.

[0007] Therefore, in order to start the engine with the AC rotating electric machine when the engine is at a low temperature and at a high temperature, it is essential to provide a DC-AC converter that can withstand a large current. However, power devices that can be used with a large current of 200 to 300 A, such as IGBTs and MOSs, are very expensive and have been problematic in practical use. Also,
In a conventional engine start control device, a means for detecting a state of charge of a battery is provided, and when the state of charge of the battery is smaller than a predetermined determination value, control is performed to prohibit automatic stop of the engine. If this determination value is set to a high value, the number of engine stops is reduced, so that a great improvement in fuel efficiency cannot be achieved. Also, if the determination value is set to a low value, the occurrence of a dead battery increases. For this reason, it has been difficult to reduce the dead battery while achieving a great improvement in fuel efficiency.

The present invention has been made in view of the above problems, and has as its object to provide an inexpensive vehicle engine start control device. Another object of the present invention is to provide a start control apparatus for a vehicle engine that achieves a reliable engine start by reducing a start failure due to a dead battery while achieving a great improvement in fuel efficiency.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, a DC-AC converter (3) connected to a DC power supply (5, 6) converts DC to AC. AC electric rotating machine (1) capable of starting the engine by receiving the supplied electric power, and DC motor (2) capable of starting the engine by receiving the power supply from the DC power supplies (5, 6)
A starter selecting means (71) that changes the selection based on at least one state of the DC power supply (5, 6) and the engine when an engine start command signal is received.

Here, at least one includes either one or both. According to this, the starter selecting means (71) selects a starter according to the DC power supply (5, 6) and the state of the engine. Therefore, for example, when the detection result detected by the capacity detecting means (72, 73) for detecting the capacity of the DC power supply (5, 6) is equal to or less than a predetermined value, the DC motor ( 2) can be selected. Claim 5
As described in the above, when the detection result by the temperature detecting means (81) for detecting the temperature of the engine is out of the predetermined range, the starter selecting means (71) can select the DC motor (2).

By selecting a starter in this way,
When the engine temperature is within a predetermined range and a large driving torque is not required for driving the engine, or when the capacity of the DC power supply (5, 6) is sufficient, the engine is started by the AC rotating electric machine (2). be able to. Therefore, the current flowing to the DC-AC converter (3) can be suppressed, so that the cost of the power device used for the DC-AC converter (3) can be reduced, and by starting the AC rotating electric machine (2). The engine can be started quietly and smoothly.

When the engine temperature is out of a predetermined range or when the capacity of the DC power supply (5, 6) is small, the engine is started by the DC motor (2). Thus, the engine can be started even when the engine driving torque is large and it is difficult for the AC rotating electric machine (2) to start the engine. According to the third aspect of the present invention, the DC power supply (5, 6) includes a high-voltage battery (5) for supplying power to the AC rotating electric machine (1) and a low-voltage battery (6) for supplying power to the DC motor (2). Starter selecting means (71)
Is characterized in that the DC motor (2) is selected when the capacity of the high-voltage battery (5) detected by the capacity detecting means (72, 73) is equal to or less than a predetermined value.

According to the present invention, the DC power supply (5, 6) connects the high-voltage battery (5) and the low-voltage battery (6), and switches from the high-voltage battery (5) to the low-voltage battery (6). A DC-DC converter (4) for charging the low-voltage battery (5) when the capacity of the low-voltage battery (6) detected by the capacity detection means (72, 73) is equal to or less than a predetermined value. It is characterized by further comprising a recovery charge command means (74) for commanding charging to (6).

According to this, by using the DC power supply (5, 6) as two power supplies of the high voltage battery (5) and the low voltage battery (6), even if one battery is over-discharged, Can be driven, so that a situation in which the engine cannot be started due to a dead battery can be avoided.
The low-voltage battery (6)
Is over-discharged and the DC motor (2) cannot be started by the low-voltage battery (6), the DC-DC converter (4) charges the low-voltage battery (6) from the high-voltage battery (5). Then, after the charging is completed, the engine can be driven by the DC motor (2) supplied with power from the low-voltage battery (6).

[0015] In the inventions according to claims 6 to 12 as well, as in the inventions according to claims 1 to 5,
Inexpensive or reduced starting failure due to dead battery,
Alternatively, it is possible to provide an engine starting device that achieves reliable engine starting. An AC rotating electric machine (1) and a DC motor (1) are used as a plurality of rotating electric machines for starting.
In the configuration including the above, these are alternatively or used together as a starter. Therefore, both the state where only the AC rotating electric machine (1) is selected as the starter, the state where only the DC motor (2) is selected as the starting machine, and both the AC rotating electric machine (1) and the DC motor (2) Are available as the starter. And from any two of these three states,
Alternatively, any one of the three states is selected by the starter selecting means (71). This selection is made according to the conditions at the time of starting, and the selection state of the AC rotating electric machine (1) and the DC motor (2) as the starting machine changes according to the conditions. This choice or change
Judgment of the starting capability of the starter only based on the state of the DC power supply alone, or judgment of only the quality of the engine startability based on the state of the engine only, or start of the starter side by using both the state of the DC power supply and the engine state It is based on the judgment based on the comparison between the ability and the startability of the engine,
Conditions are set so that the engine can be started with low power consumption.

As described above, the starter selecting means (71)
A starting machine is selected from the AC rotating electric machine (1) and the DC motor (2), and the selection is switched based on at least one of the states of the DC power source and the engine at the time of starting. With this configuration, even when the starting condition changes over a wide range, the starting can be reliably performed with low power consumption. In addition,
As a mode for selecting a starter from the AC rotary electric (1) and the DC motor (2), an alternative of selecting only one of them and a combination of selecting both of them can be adopted. For example,
It is possible to adopt a configuration in which the selection is made alternatively and the selective switching is performed, and a configuration in which the selection is made alternatively and the additional selection is performed to perform the supplementary switching.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with specific means described in the embodiments described later.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) The configuration of a starting device for a vehicle engine according to the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing a configuration of an engine starter and its peripheral devices. The AC rotating electric machine (MG) 1 includes a stator that works as an armature and a rotor that works as a field. The rotor rotates integrally with a shaft that interlocks with the crankshaft of the engine. Then, a pair of pole cores having a plurality of claw-shaped magnetic pole portions are combined,
A field winding 11 for exciting the pole core is wound around the inside of the pole core in the radial direction. The stator is arranged on the outer diameter side of the rotor, and has stator windings of three-phase (U, V, W phase) distributed winding.

In the AC rotating electric machine 1, when a current flows through the field winding 11, the pole core is excited, and the N-shaped
The poles and the S poles are alternately arranged. Then, in this state, when a current flows, the stator winding acts as a motor (starter) so as to generate a magnetic field having a phase difference of π / 2 with respect to the pole core. Further, when the current supply to the stator winding is cut off, an induced electromotive force is generated in the stator winding with the rotation of the rotor, thereby acting as an alternator.

A DC-AC converter (hereinafter referred to as an "inverter") 3 converts AC power into DC power and DC power into AC power. The inverter 3 is connected to the AC rotating electric machine 1 and
It is also connected to a 6 V high voltage battery 5. The high-voltage battery 5 is connected to a high-voltage load 51 such as a heater, and supplies high-voltage power to operate the high-voltage load 51.

When operating the AC rotating electric machine 1 as a starter, the DC power of the high-voltage battery 5 is converted into AC power by the inverter 3, and the AC power is supplied to the AC rotating electric machine 1. When the AC rotating electric machine 1 is operated as an alternator, the AC power generated by the AC rotating electric machine 1 is converted into DC power by the inverter 3, and DC power is supplied to the high-voltage battery 5 and the high-voltage electric load 8.

The power converter 31 includes six power transistors 311a to 311f and six diodes 312a to 312a.
312f. Power transistor 3
11a and 311b, 311c and 311d, 311e and 3
11f are paired with each other. Three pairs of these are connected to the high-voltage battery 5 in parallel with each other, and the power transistors of each pair are connected to the U, V, W phase terminals of the stator winding. And each power transistor 311a
To 311f in parallel with diodes 312a to 312f, respectively.
Is connected. In addition, the power transistor 311a
Outputs b1 to b6 of the control circuit 32 in the inverter 3 are input to the bases b1 to b6 of the inverters 311f, respectively. When this signal is Hi, the power transistors 311a to 311f become conductive. ing.

A current sensor 33 is provided at each of the terminals U, V, and W of the stator winding, and a detection value detected by the current sensor 33 is input to a current limiting circuit 34. When the current limit circuit 34 determines that the detected value has exceeded a predetermined value, a current limit signal is input to the control circuit 32. Then, the control circuit 32 adjusts the output signals to the bases b1 to b6 of the power transistors 311a to 311f so that the terminals U, V, and W of the stator windings are adjusted.
, That is, the power transistors 311a to 311-3
The current flowing through 11f is limited.

The control circuit 32 is also connected to a field control circuit 13 for controlling the energization ratio of the transistor 12.
By changing the conduction ratio of the transistor 12,
The current flowing through the field winding 11 is changed. By changing the current flowing through the field winding 11, the amount of power generated when the AC rotary electric machine 1 functions as an alternator can be adjusted. .

After the engine is started, that is, when the AC rotary electric machine 1 functions as an alternator, the engine speed oscillates before and after the target idle speed. The engine speed is detected by a speed sensor, and the detected value is input to the control circuit 32. When the detected value of the engine speed exceeds the target value, the transistor 1
By increasing the conductivity of 2 and increasing the amount of power generation,
Increase load and decrease engine speed. When the detected value of the engine speed is lower than the target value, the load is reduced and the engine speed is increased by reducing the conductivity of the transistor 12 to suppress the power generation amount. Thus, the engine vibration during idling is absorbed by the AC rotary electric machine 1. When the engine speed is significantly lower than the target value, for example, when a large load is suddenly applied, the engine speed is increased by operating the AC rotating electric machine 2 as a motor to absorb engine vibration. It is also possible.

The DC starting motor (ST) 2 functions as a starter for starting the engine. The DC starting motor 2 is connected to a 12 V low-voltage battery 6 and operates by being supplied with DC power. The low-voltage battery 6 is also connected to a low-voltage electric load 61 such as a light, and operates with the power supplied from the low-voltage battery 6. The low-voltage battery 6 includes a DC-DC converter (hereinafter simply referred to as “D
It is called "C-DC converter". ) 4 is also connected.
This DC-DC converter 4 converts 36V DC power to 12V
The AC rotary electric machine 1
The AC power generated by the inverter 3 is converted into DC power by the inverter 3 and supplied. Then, while charging the low-voltage battery 6, the power is also supplied to the low-voltage electric load 61.

When the capacity of the low-voltage battery 6 is insufficient,
The DC-DC converter 4 converts 36V DC power from the high voltage battery 5 into 12V DC power,
By charging the low-voltage battery 6 with the VDC power, the DC starting motor 2 can be operated. For starting the engine, the AC rotating electric machine 1 or the DC starting electric motor 2 is used, and the selection is performed by the start control device 7. The start control device 7 has a high-voltage battery capacity detecting means 72 for detecting the capacity of the high-voltage battery 5 and a low-voltage battery capacity detecting means 73 for detecting the capacity of the low-voltage battery 6. These battery capacity detecting means 7
2, 73 may directly detect the battery capacity by a known method such as integration of charge / discharge current of the battery, battery temperature, terminal voltage of the battery, or specific gravity of the battery. , Or the travel time.

The low-voltage battery capacity detection means 73 is connected to the recovery charge command means 74. The recovery charging command means 74 issues a command to operate the DC-DC converter 4 when the battery capacity of the low-voltage battery 6 is equal to or less than a predetermined value. Then, the electric power from the high-voltage battery 5 is transferred to DC
-Supply to the low-voltage battery 6 via the DC converter 4 to perform charging. The recovery charge command means 74 is provided by the start control device 7.
When the low-voltage battery 6 is being charged, a display “recovery charging” is displayed to inform the driver that the battery is being charged. When the detection value detected by the low voltage battery detection means 73 exceeds a predetermined value, the recovery charge command means 71 inputs the detection value of the capacity of the low voltage battery 6 to the starter selection means 71.

The starter selection means 71 includes a high-voltage battery capacity detection means 72, a recovery charge command means 74, an idle stop control device 8 outside the start control device 7, an engine water temperature sensor 81, and key operations from the driver. A starter for starting the engine is selected based on a signal from a starter switch 86 or the like that generates an engine start command signal. The signal from the starter selecting means 71 is input to the switch 21 arranged in series with the DC starting motor 2 or the control circuit 32 in the inverter 3.

When a predetermined engine stop condition is satisfied during engine operation, the idle stop control device 8
An automatic engine stop control signal is issued, and when a predetermined engine start condition is satisfied while the engine is stopped, an automatic engine start control signal is issued. The idle stop control device 8 includes a temperature sensor 81 for detecting the temperature of the engine coolant, a clutch upper switch 82 that is turned on when a clutch pedal (not shown) is lightly depressed, and an on when the clutch pedal is fully depressed. A clutch lower switch 83, an engine speed sensor 84 for detecting the engine speed, and a vehicle speed sensor 85 are connected. Then, various signals from the sensors 81, 84, 84 and the switches 82, 83 are input to the idle stop control device 8 and used to determine the engine stop condition and the engine start condition. Then, when the engine start condition is satisfied, a start command is issued to the start control device 7. When the engine stop condition is satisfied, a fuel injection signal to an injector (not shown) and an ignition signal to an igniter (not shown) are stopped to automatically stop the engine.

Here, the condition that the predetermined engine stop condition is satisfied means that, for example, the engine speed is equal to or less than a predetermined value, and the clutch upper switch or the clutch lower switch is turned off.
FF, a state in which all the conditions that the engine coolant temperature is equal to or lower than a predetermined value and the vehicle is stopped are satisfied. The state where the predetermined engine start condition is satisfied means, for example, a state where the clutch lower switch is turned on while the engine is stopped.

Next, the operation of the start control device for a vehicle engine having the above configuration will be described with reference to the flowchart of FIG. The flowchart of FIG. 2 shows the operation of the start control device 7 after a predetermined engine stop condition is satisfied while the vehicle is stopped and the engine is running. In step 1,
It is determined whether the start control device 7 has received an engine start command from the idle stop control device 8 or by a switch operation by the driver's will. In the present embodiment, the engine start command is issued while the engine is stopped and the clutch lower switch is turned on. When a start command is received in step 1, the process proceeds to step 2.

In step 2, it is determined whether or not the engine cooling water temperature Tw detected by the temperature sensor 81 is within a predetermined range (for example, 30 ° C. to 85 ° C.). In step 3, it is determined whether or not the capacity of the high-voltage battery 5 is sufficient. If the engine cooling water temperature is within the predetermined range and the capacity of the high-voltage battery is not insufficient, it is determined that the AC rotating electric machine 1 can start the engine, and the process proceeds to step S4. Then, in step 4, an operation command is issued from the starter selecting means 71 to the control circuit in the inverter 3, and the engine is started by the AC rotating electric machine 1.

When it is determined in step 2 that the engine cooling water temperature is out of the predetermined range, or when it is determined in step 3 that the capacity of the high-voltage battery 5 is insufficient, it is difficult to start the engine by the AC rotating electric machine 1. Therefore, the process proceeds to step 8, and the starting control of the DC starting motor 2 in steps 8 to 13 is performed.

In step 8, it is determined whether or not the capacity of the low-voltage battery 6 is insufficient. When the determination result of step 8 is false, that is, when the capacity of the low-voltage battery 6 is sufficient, the process proceeds to step 13. Then, in step 13, the switch 21 is turned on from the starter selecting means 71.
The engine is started by the DC starting motor 2.

On the other hand, when the result of the determination in step 8 is true, that is, when the capacity of the low-voltage battery 6 is insufficient, the process proceeds to step 9. Then, the recovery charge command means 74
-Operate the DC converter 4 to charge the low-voltage battery 6 from the high-voltage battery 5. At this time, the driver cannot start the engine even though the driver is trying to start the engine. Therefore, in order to prevent the driver from feeling uncomfortable, the display means 9 displays “recovery charging” during charging of the low-voltage battery 6 (step 10).
do.

In step 11, it is determined whether or not the charging of the low-voltage battery 6 has been completed. When the charging of the low-voltage battery 6 is completed, the "recovery charging" display is turned off (step 12). Then, in step 13, a signal for turning on the switch 21 is issued from the starter selecting means 71, the DC starting motor 2 is operated by the charged low-voltage battery 6, and the engine is started.

After the engine is started by the AC rotating electric machine 1 or the DC starting motor 2, the AC rotating electric machine 3 is operated as an alternator to generate electric power and to charge the high-voltage and low-voltage batteries 5 and 6 (step 5). . At the same time, power is also supplied to the high-voltage and low-voltage electric loads 51 and 61. Note that, even after the engine is started, the AC rotating electric machine 1 is operated as a motor when assisting in engine torque is required, such as during acceleration running.

In step 6, it is determined whether or not there is an engine stop command from the idle stop control device 8. When the engine stop command is received, the engine is stopped (step 7) and the control processing routine ends. In the present embodiment, when a large starting lock torque is not required, priority is given to starting the engine by the AC rotating electric machine 1. Therefore, it is possible to improve the quiet startability of the engine.

In this embodiment, when the engine coolant temperature is outside the predetermined range, that is, when a large engine starting torque is required, the engine is started using the DC starting motor 2. Therefore, a power transistor having a low maximum current conduction rating can be adopted as a power device of the inverter 3 connected to the AC rotary electric machine 1, and the cost of the inverter 3 can be reduced.

In this embodiment, the engine is started using the DC starting motor 2 even when the capacity of the high voltage battery 5 for operating the AC rotating electric machine 1 is insufficient. In addition, even when the capacity of the low-voltage battery 6 is insufficient, the DC starting motor 2 can be operated by charging the low-voltage battery 6 from the high-voltage battery 5. Therefore, it is possible to reduce a situation in which the engine cannot be started due to a dead battery.

The high-voltage battery 5 to the low-voltage battery 6
When the battery is being charged, the display of “recovery charging” can be performed so that the driver of the vehicle does not feel uncomfortable. In the present embodiment, the torque required for starting the engine is estimated from the engine cooling water temperature, so that the starter selecting means 71 has a simple configuration.
Any parameter can be used as long as the parameter can evaluate the torque required for starting the engine. For example, the parameter may be estimated based on an engine stop time indicating the state of the engine or an outside air temperature indicating the state of the engine.

(Other Embodiments) In the first embodiment,
In the engine restart during idle stop, the configuration has been described in which the DC starting motor 2 restarts the engine when the high-voltage battery 5 has insufficient capacity. However, the start control device 7 can be similarly applied at the time of the initial start of the engine. In this case, the engine start command signal is given from the starter switch 86 or the like by the operation of the driver. That is, when a large starting lock torque is required when the engine is cold, or when the capacity of the high-voltage battery 5 is insufficient, the DC starting motor 2 can start the engine. Also, due to dark current while the vehicle is stopped,
Even when the low-voltage battery 6 is over-discharged and starting by the low-voltage battery 6 and the DC starting motor 2 is difficult, the low-voltage battery 6 is charged from the high-voltage battery 5 via the DC-DC converter 4 and charging is completed. Later, the engine can be started.

In the first embodiment, when the starting lock torque is large or when the capacity of the high-voltage battery 5 is small, it is determined that starting with the AC rotating electric machine 1 is difficult, and the engine is started with only the DC motor 2. did. But,
If it is determined that starting with only the AC rotating electric machine 1 is difficult, such as when the state of both the DC power supply and the engine is difficult to start, such as when the capacity of the high-voltage battery 5 is small and the engine is cold, The engine may be started by using the DC starting motor 2 in addition to the electric machine 1.

Also, when the capacity of the low-voltage battery 6 is insufficient, it is difficult to start the engine using only the DC starting motor 2, but the engine can be started by using the AC rotating electric machine 1 as an auxiliary. It is. In the first embodiment, two batteries 5 having different rated voltages are used.
6, the configuration may be such that only one battery is provided and two voltage outputs are taken out from this single battery.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an engine starting device according to an embodiment of the present invention.

FIG. 2 is a flowchart of engine start control according to the present invention.

FIG. 3 is a diagram showing a relationship between an engine speed at the time of engine start and an inverter current.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... AC rotary electric machine, 2 ... DC starting motor, 3 ... Inverter, 31 ... Power transistor, 32 ... Current limiting means,
33: current sensor, 4: DC-DC converter, 5: high voltage battery, 5: high voltage battery, 51: high voltage load, 6
... low-voltage battery, 61 ... low-voltage load, 7 ... start control device, 71 ... starter selection means, 72 ... high-voltage battery capacity detection means, 73 ... low-voltage battery capacity detection means, 74 ... recovery charge command means.

Claims (12)

[Claims] An automatic engine for issuing an engine stop command signal when a predetermined engine stop condition is satisfied during operation of an engine mounted on a vehicle and for issuing an engine start command signal when a predetermined engine start condition is satisfied. In a stop / start device (8) or a start control device for a vehicle engine for starting the engine upon receiving an engine start command signal from a driver, a DC-AC converter (3) connected to a DC power source (5, 6). A) an AC rotary electric machine capable of starting the engine by receiving supply of electric power converted from DC to AC according to (1)
And selecting a DC motor (2) capable of starting the engine by receiving power supply from the DC power supply (5, 6), upon receiving the engine start command signal, selecting the DC power supply (5, 6). ) And a starter selecting means (71) for changing the starter based on at least one state of the engine. 2. The apparatus according to claim 1, further comprising a capacity detecting means for detecting a capacity of the DC power supply, wherein the starter selecting means includes a capacity detecting means.
2. The vehicle engine start control device according to claim 1, wherein the DC motor (2) is selected when a detection result detected by (2, 73) is equal to or less than a predetermined value. 3. The high-voltage battery (5) for supplying power to the AC rotating electric machine (1), the DC power supply (5, 6);
A low-voltage battery (6) for supplying electric power to the DC motor (2); and the starter selecting means (71) includes the capacity detecting means (7).
The high-voltage battery (5) detected by (2, 73)
3. The start control device for a vehicle engine according to claim 2, wherein the DC motor (2) is selected when the capacity of the DC motor is equal to or less than a predetermined value. 4. The direct-current power supply (5, 6) connects the high-voltage battery (5) and the low-voltage battery (6) and charges the low-voltage battery (6) from the high-voltage battery (5). A DC converter (4), wherein when the capacity of the low-voltage battery (6) detected by the capacity detection means (72, 73) is equal to or less than a predetermined value, the high-voltage battery (5) is switched to the low-voltage battery; The vehicle engine start control device according to claim 3, further comprising a recovery charge command means (74) for commanding charging of (6). 5. The starter selecting means (71) selects a DC motor (2) when the detection result by the temperature detecting means (81) for detecting the temperature of the engine is out of a predetermined range. The start control device for a vehicle engine according to any one of claims 1 to 4, wherein 6. An automatic engine which issues an engine stop command signal when a predetermined engine stop condition is satisfied during operation of an engine mounted on a vehicle and issues an engine start command signal when a predetermined engine start condition is satisfied. A start / stop device (8) or a starter for a vehicle engine that starts the engine in response to an engine start command signal from a driver; a DC motor (2) operable as a starter when the engine is started; It is operable as a starter when the engine is started, and is capable of supplying power to the AC rotating electric machine (1) operable as a generator after the engine is started, and to the AC rotating electric machine (1) and the DC motor (2). DC power supply (5, 6), and the AC rotating electric machine (1) is connected between the DC power supply (5, 6), When the machine (1) operates as a starter, the DC power of the DC power supplies (5, 6) is converted into AC power and supplied to the AC rotating electric machine (1), and the AC rotating electric machine (1) is converted. ) Operates as a generator, an AC-DC converter (3) that converts AC power from the AC rotating electric machine (1) into DC power and supplies the DC power to the DC power supplies (5, 6). Further, when the engine start command signal is received, the AC rotating electric machine (1) and the DC motor (2) are controlled based on at least one of the states of the DC power supply (5, 6) and the engine. A starting device for a vehicle engine, comprising a starter selecting means (71) for changing selection. 7. The engine according to claim 1, further comprising at least one of capacity detection means (72, 73) for detecting the capacity of the DC power supply (5, 6) and temperature detection means (81) for detecting a temperature of the engine. Machine selection means (71), the capacity detection means (7
2, 73) and at least one of the AC rotating electric machine (1) and the DC motor (2) based on the detection result detected by at least one of the temperature detecting means (81). The starting device for a vehicle engine according to claim 6, wherein 8. The starter selecting means (71) selects the DC motor (2) when the detection result detected by the capacity detecting means (72, 73) is equal to or less than a predetermined value. The starting device for a vehicle engine according to claim 7. 9. A high-voltage battery (5) for supplying power to the AC rotating electric machine (1), wherein the DC power supply (5, 6) includes:
A low-voltage battery (6) for supplying electric power to the DC motor (2); and the starter selecting means (71) includes the capacity detecting means (7).
The high-voltage battery (5) detected by (2, 73)
The starting device for a vehicle engine according to claim 8, wherein the DC motor (2) is selected when the capacity of the DC motor is equal to or less than a predetermined value. 10. The DC power supply (5, 6) connects the high-voltage battery (5) and the low-voltage battery (6),
A DC-DC converter (4) for charging the low-voltage battery (6) from the high-voltage battery (5); and a capacity of the low-voltage battery (6) detected by the capacity detection means (72, 73). The vehicle engine according to claim 9, further comprising a recovery charge command unit (74) for commanding charging of the low-voltage battery (6) from the high-voltage battery (5) when the value is equal to or less than a predetermined value. Starting device. 11. When a charge command is issued from the high-voltage battery (5) to the low-voltage battery (6) by the recovery charge command means (74), the driver of the vehicle is notified that recovery charging is being performed. The starting device for a vehicle engine according to claim 10, further comprising a transmission means (9) for transmitting. 12. When the detection result by the temperature detecting means (81) for detecting the temperature of the engine is out of a predetermined range, the starter selecting means (71) controls the DC motor (2).
The engine starting device for a vehicle according to any one of claims 7 to 11, wherein: