JP2003286930A - Engine starting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine starting device capable of smoothly starting an engine. <P>SOLUTION: While a starter motor 15 is actuated, actuation of a motor generator 16 is prohibited, and while the motor generator 16 is actuated, actuation of the starter motor 15 is prohibited. Simultaneous actuation of the starter motor 15 and the motor generator 16 to extremely lower battery voltage is thus eliminated. Failure for both the starter motor 15 and the motor generator 16 to obtain necessary power for starting normally to cause extremely long time taken for engine start, or engine start failure, can thus be securely prevented. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine starting device.

[0002]

2. Description of the Related Art In a vehicle having a so-called idle stop function for automatically stopping the engine when the vehicle is temporarily stopped such as waiting for a signal while the vehicle is traveling,
Some include a starting motor used when the engine is started in response to the operation of an ignition switch, and an auxiliary machine driving motor that drives auxiliary machines during idle stop.

For example, in Japanese Patent Laid-Open No. 2001-193516, a clutch is provided between the output shaft of the engine and the input shaft of the auxiliary machine and the output shaft of the auxiliary machine drive motor.
The clutch is controlled according to the operating condition of the engine,
A technique has been disclosed in which, when it is determined that the clutch cannot be coupled, an accessory is driven by an accessory drive motor regardless of the operating state of the engine.

In Japanese Patent Laid-Open No. 2001-193516, the starting ring gear connected to the crankshaft and the gear of the starting motor are engaged only when the engine is started by operating the ignition switch. That is, when the shift switch is in the parking or neutral position and the ignition switch is switched from the ON position to the START position, the gear of the starting motor jumps into the starting ring gear and the engine is started by meshing them. I am letting you. When restarting from idle stop, the engine is started by the auxiliary machine drive motor.

[0005]

However, in such a conventional technique, since two engine starting means, that is, a starting motor and an auxiliary machine driving motor, are provided, when these two motors operate at the same time, Or if the operating times of these two motors overlap,
The battery voltage drops significantly, and these two motors may not be able to obtain the electric power required for a normal start, so that it may take a long time to start the engine, or in some cases, the engine may not start.

Further, if a mechanical meshing mechanism for thrusting and meshing the gear of the starting motor with respect to the ring gear is applied to one of the plurality of starting means,
If the gear of the starting motor is jumped into the starting ring gear while the engine is being driven by the accessory drive motor, noticeable gear meshing noise will occur, or the gear or motor will not mesh. Problems such as excessive wear of the shaft may occur.

[0007]

Therefore, the invention according to claim 1 is applied to a vehicle provided with a plurality of electric motors for starting an engine, and is characterized in that the plurality of electric motors are not simultaneously operated.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the engine automatically stops and restarts the engine according to operating conditions of the vehicle. The plurality of electric motors are characterized by including a starter motor that starts the engine only by operating the engine key, and a restarting electric motor that starts the engine when the engine is automatically restarted.

According to a third aspect of the present invention, in the second aspect of the invention, the starter motor is provided with respect to a ring gear provided on a crankshaft of the engine.
Rotation torque is transmitted by a pinion, and the restarting electric motor is characterized in that the crankshaft is driven via a belt.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, when one of the plurality of electric motors is operating, the other electric motors are controlled so as not to operate. It is characterized in that it is provided with a control means.

According to a fifth aspect of the invention, in the invention according to any one of the first to third aspects, one of the plurality of electric motors is energized, and one of the plurality of electric motors is energized. It is characterized in that it is provided with an electric circuit that interrupts energization to the other electric motors when the electric motor is operating.

According to a sixth aspect of the invention, in the second or third aspect of the invention, when the starter motor is started by operating an engine key during operation of the restarting electric motor, the restarting motor is restarted. The feature is that the electric motor stops.

[0013]

According to the present invention, even when the vehicle is equipped with a plurality of electric motors for starting the engine, the plurality of electric motors do not operate simultaneously, so that the plurality of electric motors operate simultaneously. As a result, the battery voltage will drop significantly, multiple motors will not be able to obtain the power required for normal startup, and it will take a significant amount of time to start the engine.
It is possible to prevent the engine from being unable to start.

According to the third aspect of the present invention, the pinion does not jump into the ring gear while the engine is being rotated by the restarting electric motor, so that gear meshing noise is prevented. As well as
It is possible to reliably prevent excessive wear of the pinion, the ring gear, and the motor shaft of the starter motor.

[0015]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the system configuration of a vehicle (not shown) equipped with an engine starter according to the present invention. The engine 1 is operated by an engine control module 2 (hereinafter referred to as ECM). Note)). When the ECM 2 determines that there is an engine automatic stop request (described later) when the vehicle is temporarily stopped after the warm-up operation ends, the ECM 2 automatically stops the engine 1 (engine automatic stop), and an engine automatic restart request (described later) is issued. If it is determined that it is, the engine is controlled to restart automatically.

The ECM 2 includes a vehicle speed sensor 3 for detecting the vehicle speed of the vehicle, an accelerator pedal sensor 4 for detecting ON / OFF of the accelerator pedal from the amount of depression of the accelerator pedal, and an ON / OFF of the brake pedal from the amount of depression of the brake pedal. Brake pedal sensor 5 for detecting, throttle sensor 6 for detecting throttle opening, engine 1
Water temperature sensor 7 for detecting the cooling water temperature, an inhibitor switch 8 for determining the shift position of a select lever of an automatic transmission (not shown), an oil temperature sensor 9 for detecting the oil temperature of the automatic transmission, the automatic Output signals are input from a hydraulic pressure sensor 10 that detects the hydraulic pressure of the transmission, a brake negative pressure booster sensor 11 that detects the negative pressure of the brake negative pressure booster that assists the operation of the brake pedal, and the like. Further, the ECM 2 is input with an ON-OFF signal of the air conditioner (A / C) 12 and an output signal from the engine key switch 13.

The engine key switch 13 is switched by rotationally operating the engine key inserted by the driver, and the ECM 2 receives the output signal from the engine key switch 13 to determine the position of the engine key, that is, the position of the engine key. It is determined whether the engine key switch is in the ACC position for supplying electric power to the electric system of the vehicle, the ON position, or the START position for driving the starter motor 15 (described later).

Further, the ECM 2 controls the fuel injection amount of the injector 14 arranged in the engine 1, and the starter motor 15 and the motor generator 16 are also provided.
Control the operation of.

In this starter motor 14, a pinion (not shown) provided on a rotating shaft (not shown) of the starter motor 14 is jumped into a ring gear (not shown) provided on the crankshaft 17 of the engine 1. By transmitting the rotation torque, the rotation torque is transmitted. On the other hand, the motor generator 16 as a restarting electric motor that starts the engine 1 when the engine is automatically restarted drives the crankshaft 17 via the belt 18.

The ECM 2 is a starter motor 1
5, the amount of charge of the motor generator 16, and the battery (not shown) that supplies electric power to the vehicle electrical system (not shown) is monitored.

Here, the engine automatic stop request and the engine automatic restart request will be described. In ECM2, the selector lever of the automatic transmission is in the D range, the brake pedal is depressed by the driver, and the vehicle speed is 0 (km / km
h), and when the engine 1 is burning with all the opening and closing devices such as doors and bonnets closed, the accelerator OF
F, brake ON, battery charge (battery SO
C) is a predetermined value or more, engine water temperature is a predetermined value or more, automatic transmission oil temperature is a predetermined value or more, automatic transmission hydraulic pressure is a predetermined value or more, brake negative pressure booster negative pressure is a predetermined value or more, throttle opening Is 0%, A / C 12 is OFF (stopped), etc., it is determined that there is an engine automatic stop request, and the engine 1
Stop automatically. In the ECM2, the select lever of the automatic transmission is in the D range, the brake pedal is depressed by the driver, the vehicle speed is 0 (km / h), and the opening / closing devices such as the door and the hood are all closed. While the engine is automatically stopped, the accelerator is turned on, the brake is turned off, the charge amount of the battery is below a predetermined value (the battery SOC is lowered),
The engine water temperature is below a predetermined value, the oil temperature of the automatic transmission is below a predetermined value, the hydraulic pressure of the automatic transmission is below a predetermined value, the negative pressure of the brake negative pressure booster is below a predetermined value, the A / C 12 is ON (in operation), If any of the above is detected, it is determined that there is a request for automatic engine restart, the motor generator 16 is started, and the engine 1 is automatically restarted.

Next, the control flow of the engine starting device as a control means for preventing the starter motor 15 and the motor generator 16 from operating at the same time, the flowchart of FIG. 2 showing the control flow for the starter motor 15, and the motor This will be described with reference to the flowchart of FIG. 3 showing the flow of control regarding the generator 16.

First, in the flowchart shown in FIG. 2, in step 101, it is judged whether or not the engine key is in the START position. If the engine key is in the START position, the process proceeds to step 102. If it is not in the START position (the engine key is (If it is in the ACC, ON position, etc.), the routine proceeds to step 103, where the starter motor starting flag = 0.
And

In step 102, the motor generator starting flag is discriminated. When the motor generator starting flag = 1, the process proceeds to step 103, and when the motor generator starting flag = 0, step 104.
Proceed to.

In step 104, the starter motor 15
To start the engine 1. The starter motor 15 started in step 104 operates only while the engine key switch 13 is switched to the START position by the engine key inserted by the driver, and the driver does not start the engine. Turns on the engine key from the START position, judging that it is completed
After returning to the position, from step 101 to step 10 thereafter
Therefore, the starter motor 15 does not operate.

Then, in step 105, the starter motor starting flag is set to 1.

The starter motor starting flag and the motor generator starting flag are always "0" or "1", respectively, and when the starter motor 15 is not operating, the starter motor is starting. The flag is "0", and the starter motor starting flag is "1" when the starter motor 15 is operating. Similarly, the motor generator starting flag is "0" when the motor generator 16 is not operating, and the motor generator starting flag is "1" when the motor generator 16 is operating.

Next, in the flow chart shown in FIG. 3, in step 201, is idle stop being performed?
That is, determine whether the engine is automatically stopped,
If the idle stop is in progress, the process proceeds to step 202. If the idle stop is not in progress, the process proceeds to step 20.
Then, the process proceeds to step 3 and sets the motor generator starting flag = 0.

In step 202, it is determined whether the engine automatic restart condition is satisfied, that is, whether there is an engine automatic restart request. If the engine automatic restart condition is satisfied, the process proceeds to step 204, If the condition for automatic engine restart has not been established, step 203
Proceed to.

In step 204, the starter motor starting flag is determined, and the starter motor starting flag =
In the case of 1, the process proceeds to step 203, and in the case of the starter motor starting flag = 0, the process proceeds to step 205.

In step 205, the motor generator 1
6 is operated to start the engine 1, and in step 206, the motor generator starting flag = 1 is set.

At step 207, the complete explosion of the engine 1 is judged, and if it is judged that the engine 1 has completely exploded, the routine proceeds to step 208.

In step 208, the operation of the motor generator 16 for automatically restarting the engine is stopped. Then, in step 209, the motor generator starting flag = 0 is set.

The flowcharts shown in FIGS. 2 and 3 are
The control motors exist in parallel, and the starter motor 15 can be started when the motor generator 16 is not started (motor generator starting flag = 0). It can be started in a state where it is not started (starter motor starting flag = 0).

In the engine starter of the first embodiment, the starter motor 15 and the motor generator 16 are controlled by the ECM 2 so that they will not operate simultaneously. The battery voltage does not drop significantly due to simultaneous operation of the two. That is, it is possible to reliably prevent both the starter motor 15 and the motor generator 16 from being unable to obtain the electric power required for a normal start, resulting in an excessively long engine start, or an engine start failure.

Since the pinion does not jump into the ring gear while the engine is being rotated by the motor generator 16, the gear meshing noise can be prevented and the pinion, ring gear and starter motor 15 can be prevented. It is possible to reliably prevent excessive wear and the like of the motor shaft.

In the above-described first embodiment, the operation of the motor generator 16 is stopped when the engine 1 has completely exploded. However, the engine 1 is driven from the motor generator 16 following the complete explosion of the engine 1. In consideration of the case where the power assist is required and the case where the battery charge is required due to the decrease of the battery charge amount, the ECM determines whether or not the motor generator 16 needs to be continuously operated after the engine complete explosion. After the engine has completely exploded, the operation of the motor generator 16 may be stopped after the operation of the motor generator 16 becomes unnecessary, and the motor generator starting flag = 0 may be set.

In step 207 of FIG. 3,
Instead of performing a complete explosion determination of the engine 1, it is determined whether the engine 1 has a rotational speed higher than or equal to a predetermined rotational speed, and when the engine 1 is higher than or equal to the predetermined rotational speed, the operation of the motor generator 16 is stopped. You may do it.

Next, a second embodiment of the present invention will be described with reference to FIGS.
Will be explained.

FIG. 4 is an explanatory diagram showing the system configuration of a vehicle (not shown) equipped with the engine starting device of the second embodiment. The same components as those in the first embodiment described above are designated by the same reference numerals to simplify the description. In addition, the thin lines in the figure represent control lines through which various signals are exchanged, and the thick lines in the figure represent power lines for supplying power from the battery 30 (described later) to the starter motor 15 and the motor generator 16.

Also in this second embodiment, the above-mentioned first
Similar to the embodiment, the ECM 2 automatically stops the engine 1 when it determines that there is an engine automatic stop request and when it determines that there is an engine automatic restart request when the vehicle is temporarily stopped after the warm-up operation ends, Controlled to restart.

The ECM 2 has a vehicle speed sensor 3, an accelerator pedal sensor 4, a brake pedal sensor 5, a throttle sensor 6, a water temperature sensor 7, as in the first embodiment.
Inhibitor switch 8, oil temperature sensor 9, oil pressure sensor 1
0, the output signals from the brake negative pressure booster sensor 11 and the like are input, and the air conditioner (A
/ C) 12 ON-OFF signal is input. Further, the ECM 2 controls the fuel injection amount of the injector 14 arranged in the engine 1.

On the other hand, in the second embodiment, as shown in FIGS. 4 and 5, the engine key switch 30 which is switched by rotating the engine key inserted by the driver causes the starter motor from the battery 31 to be switched. The electric power supplied to the motor 15 and the motor generator 16 is mechanically switched.

In other words, when one of the starter motor 15 and the motor generator 16 is energized by the battery 31, an electric circuit is constructed so that the energization of the other by the battery 31 is cut off. .

That is, the engine key switch 30 is A
When switched to the CC position, the battery 31 causes the ECM
Electric power is supplied to the vehicle electrical system including 2. When the engine key switch 30 is switched to the ON position, electric power can be supplied from the battery 31 to the motor generator 16 via the relay 32. Here, the relay 32 is
During the engine automatic stop, the ECM 2 receives a motor generator start command from the ECM 2 when it is determined that there is an automatic restart request, and is turned on. When the ECM 2 is turned on, electric power is supplied to the motor generator 16. That is, even if the engine key switch 30 is in the ON position, electric power is not supplied to the motor generator 16 unless there is a motor generator start command.

When the engine key switch 30 is switched to the START position, electric power is not supplied from the battery 31 to the motor generator 16, and an ON-OFF electromagnetic coil (not shown) of the relay 33 is applied. Since current flows from the engine key switch 30, the relay 33 is turned on, and power is supplied from the battery 31 to the starter motor 15 via the relay 33. That is, when the engine key switch 30 is in the OFF position and the START position, electric power is not supplied to the motor generator 16.

More specifically, even when the motor generator 16 is in operation, when the driver rotates the engine key and the engine key switch 30 switches to the START position, the power supply to the motor generator 16 is stopped, Starter motor 15 is started.

Also in the second embodiment constructed as described above, the starter motor 15 and the motor generator 16 do not operate at the same time, so that the same effect as the first embodiment described above can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a system configuration of a vehicle equipped with an engine starting device of a first embodiment according to the present invention,
Explanatory drawing of 1st Example of this invention.

FIG. 2 is a flowchart showing a control flow of a starter motor of the engine starting device according to the present invention.

FIG. 3 is a flowchart showing a control flow relating to a motor generator of an engine starting device according to the present invention.

FIG. 4 is an explanatory diagram showing the system configuration of a vehicle equipped with the engine starter according to the present invention, and is a second aspect of the present invention.
Explanatory drawing of an Example.

FIG. 5 is an explanatory diagram according to the second embodiment of the present invention.

[Explanation of symbols]

1 ... engine 2 ... ECM 15 ... Starter motor 16 ... Motor generator

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02N 11/00 F02N 11/00 N 11/04 11/04 A 15/00 15/00 E 15/02 15 / 02 A H02K 7/10 H02K 7/10 E H02P 7/67 H02P 7/67 A FF term (reference) 3G092 AB01 AC03 DG08 EA11 EA28 FA14 FA30 FA31 GA01 HF19Z 3G093 BA21 BA32 CA01 CA02 EC02 FB05 5H572 AA03 BB07 CC04 EE05 JJ03 MM20 5H607 AA00 BB01 CC03 CC05 EE28 EE31 EE54 FF02

Claims (6)

[Claims] 1. An engine starting device, which is applied to a vehicle having a plurality of electric motors for starting an engine, wherein the plurality of electric motors are not simultaneously operated. 2. The starter motor, wherein the engine automatically stops and restarts the engine according to operating conditions of the vehicle, and the plurality of electric motors start the engine only by operating an engine key. The engine starting device according to claim 1, further comprising: a restarting electric motor that starts the engine when the engine is automatically restarted. 3. The starter motor transmits rotational torque by a pinion to a ring gear provided on a crankshaft of the engine, and the restarting electric motor includes the crankshaft via a belt. The engine starting device according to claim 2, which is driven. 4. The control device according to claim 1, further comprising control means for controlling the other electric motors not to operate when one of the plurality of electric motors is operating. The engine starting device described. 5. An electric circuit in which one of the plurality of electric motors is energized, and when one of the plurality of electric motors is operating, the energization of the other electric motors is cut off. The engine starting device according to any one of claims 1 to 3, further comprising: 6. The restarting electric motor is stopped when the starter motor is started by operating an engine key while the restarting electric motor is in operation. Engine starter.