JP2003083211A - Electric motor device for start - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric motor device for start capable of performing an efficient engine start or the like by miniaturizing an auxiliary switch. SOLUTION: This electric motor device 1 for start is provided with a battery 102, an electric motor 103, a contact point part 104 electrically interposed between the battery 102 and the electric motor 103, a plunger 105 connected with the contact point part 104, a main switch 107 having a driving coil 106 and an auxiliary switch 2 having a switching function of power supply to the driving coil 106. The auxiliary switch 2 is provided with a control circuit part 4 and a semiconductor relay part 3. The control circuit part 4 outputs an operation signal to the semiconductor relay part 3 and switches by inputting the start signal of a key switch 111.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting electric motor device for starting an engine of an automobile, for example.

[0002]

2. Description of the Related Art Normally, the engine is started by transmitting the driving force of an electric motor to a ring gear connected to the engine. As a means for transmitting the driving force of the electric motor to the ring gear, the shift lever is moved by utilizing the electromagnetic attraction force of the drive coil to move the pinion provided on the axially movable body with which the shift lever comes into contact. A method is used in which the engine is started by engaging with the ring gear.

Also, a large rotational torque is required to start an engine for a large diesel engine. Therefore, a large rotational torque is applied to the pinion gear or the ring gear. At this time, when the pinion gear and the ring gear are incompletely meshed with each other and the full force torque from the electric motor is received by the pinion gear or the ring gear, the pinion gear or the ring gear may be damaged. For this reason, an auxiliary switch is provided mainly in a starting electric motor device for a large diesel engine or the like, and by operating the main switch via this auxiliary switch, it is possible to prevent the pinion gear or the ring gear from being damaged. To prevent. That is, by closing the contact of the main switch after the pinion gear and the ring gear are completely meshed with each other, the starting electric motor device generates the full torque.

FIG. 9 is a cross-sectional view of an essential part showing the structure of a conventional starting motor device, and FIG. 10 is a side view showing the appearance of FIG. Further, FIG. 11 is a connection diagram of a conventional starting electric motor device. In these drawings, a starting electric motor device 101 includes a battery 102 that is a power source, an electric motor 103 that starts an engine, a battery 102, and an electric motor 1.
03, a main switch 107 for opening and closing the power supply from the battery 102, and an auxiliary switch 108 for switching the power supply to the main switch 107 for opening and closing the main switch 107. The main switch 107 opens and closes the contact part 104 by electrically connecting the contact part 104 electrically connected to the electric motor 103 and the battery 102, the plunger 105 having one end connected to the contact part 104, and reciprocating the plunger 105. It has a drive coil 106 and supplies electric power from the battery 102 to the electric motor 103 by closing the contact 104. The auxiliary switch 108 is electrically connected to the drive coil 106 and the battery 102, and cuts off or supplies electric power from the battery 102 to the drive coil 106 so that the drive coil 106 opens and closes the contact portion 104.

The auxiliary switch 108 is an auxiliary contact portion 1 electrically connected to the battery 102 and the drive coil 106.
09 and an auxiliary drive coil 110 that opens and closes the auxiliary contact portion 109. The auxiliary drive coil 110 is
It is electrically connected to the positive electrode of the battery 102 via a key switch 111 that outputs a start signal from the outside.
Further, the auxiliary drive coil 110 is electrically connected to a grounded protection relay 112, and the protection relay 112 is opened when the engine is ignited and rotationally driven. Whether the engine is ignited or not is detected by detecting the rotation speed of an alternator or the like connected to the engine and setting a predetermined rotation speed (for example, 400r).
pm) is exceeded. That is, when the predetermined number of revolutions is exceeded, it is determined that the engine is igniting, and the protection relay 112 is opened. The auxiliary contact portion 109 is a battery-side auxiliary fixed electrode 109a electrically connected to the positive electrode of the battery 102.
And a drive coil side auxiliary fixed electrode 109b electrically connected to the drive coil 106 and a battery side auxiliary fixed electrode 109a reciprocating by energization of the auxiliary drive coil 110.
And an auxiliary movable electrode 109c that comes into contact with and separates from the auxiliary fixed electrode 109b on the drive coil side.

As shown in FIG. 12, the auxiliary switch 108 has a metal case 121 having a mounting portion 120.
The auxiliary contact portion 109 and the auxiliary drive coil 110 are housed in the structure. The auxiliary switch 108 is usually attached to the bracket near the main switch 107 by the mounting portion 1.
It is attached by screwing 20 with screws 122.

The contact portion 104 of the main switch 107 is
The battery-side fixed electrode 104a electrically connected to the positive electrode of the battery 102, the motor-side fixed electrode 104b electrically connected to the internal coil of the electric motor 103, and the battery-side fixed electrode 104a and the electric motor-side fixed by reciprocating. It has a main movable electrode 104c which comes into contact with and separates from the electrode 104b. The main movable electrode 104c is insulated and fixed to the one end portion 105a of the plunger 105 so that the main movable electrode 104c does not leak electric current through the plunger 105. The drive coil 106 is a pull-in coil 106 a electrically connected to an internal coil of the electric motor 103.
And a hold coil 106b that is grounded. The plunger 105 is moved by the electromagnetic attractive force generated by energizing the drive coil 106, and the contact portion 104 is closed.

The electric motor 103 has a field coil 103a (stator winding) and an amateur coil 103b (armature winding) that are electrically connected to each other, which are internal coils, and the field coil 103a is electrically connected to the electric motor side. It is connected to the fixed electrode 104b and the pull-in coil 106a, and the amateur coil 103b is grounded. The field coil 103a and the amateur coil 103
By energizing b, the amateur shaft 103c of the electric motor 103 rotates.

The positive electrode of the battery 102 is the key switch 1
11, the battery side fixed electrode 104a of the contact portion 104 and the battery side auxiliary fixed electrode 109a of the auxiliary contact portion 109 are electrically connected, and the negative electrode is grounded.

As shown in FIG. 9, the starting electric motor device 101 has a shift end in which one end 113a is locked to the other end 105b of the plunger 105, and the plunger 105 reciprocates to pivot about a fulcrum 123. Lever 113,
The other end 11 of the shift lever 113 is connected to the amateur shaft 103c of the electric motor 103 via a reduction gear.
The pinion 1 meshes with the contact portion 114 with which 3b abuts and the ring gear 116 connected to the engine, and reciprocates in the axial direction by the rotation of the shift lever 113.
And an axial moving body 117 having a number 15.

The abutting portion 114 is the collar portion 1 provided on the electric motor 103 side of the other end portion 113b of the shift lever 113.
14a and a side surface 114 of an overrunning clutch 118 which is a one-way clutch provided on the pinion 115 side.
b and. The other end 113b of the shift lever 113 is provided on the side surface 1 of the overrunning clutch 118.
14b so that the side surface 114b contacts the ring gear 116.
It is designed to be pressed toward. By this pressing, the side surface 114b moves toward the ring gear 116 together with the pinion 115, and at the same time, the overrunning clutch 118 transmits the rotational force of the amateur shaft 103c to the pinion 115. On the contrary, the other end 113b contacts the collar 114a and presses the collar 114a toward the electric motor 103, thereby moving the pinion 115 meshed with the ring gear 116 toward the electric motor 103, The mesh with the ring gear 116 is disengaged.

The starting motor device 101 having such a configuration
Turn on the key switch 111 when starting the engine.
When set to N, the battery 102 to the auxiliary drive coil 110
Is supplied with electric power to excite the auxiliary drive coil 110. By this excitation, the auxiliary movable electrode 1 of the auxiliary contact portion 109
09c moves toward and contacts the battery side auxiliary fixed electrode 109a and the drive coil side auxiliary fixed electrode 109b.
By this contact, the auxiliary contact portion 109 is closed, and the drive coil 106 of the main switch 107 is energized. At this time, the current flowing through the pull-in coil 106a also flows through the field coil 103a and the amateur coil 103b of the electric motor 103. Therefore, at this stage, the amateur shaft 103c of the electric motor 103 starts to rotate, but the battery 10 is pulled by the pull-in coil 106a.
Since the electric power supplied from 2 is partially consumed, its rotation speed is low.

When current flows through the pull-in coil 106a and the hold coil 106b, the pull-in coil 1
06a and the hold coil 106b are respectively excited to generate an electromagnetic attraction force. Due to this electromagnetic attraction force, the main movable electrode 104c moves together with the plunger 105 toward the battery side fixed electrode 104a and the electric motor side fixed electrode 104b. The movement of the plunger 105 is a movement to the left in FIG. 9, and therefore, the one end 11 of the shift lever 113 locked to the other end 105b.
3a also moves leftward with the plunger 105. Since the shift lever 113 is rotatably provided on the fulcrum 123, when one end 113a thereof moves leftward, the other end 113b moves rightward.

When the other end portion 113b of the shift lever 113 moves to the right, the other end portion 113b is attached to the side surface 114b of the overrunning clutch 118 forming the contact portion 114.
Pushes to the right while making contact. As a result, the rotation of the armature shaft 103c of the electric motor 103 is transmitted to the pinion 115, and the pinion 115 moves axially toward the ring gear 116.

Since both the pinion 115 and the ring gear 116 are gears, the pinion 115 is the ring gear 11.
If they move toward 6, they may hit each other's side surfaces and may not be completely meshed. In such a state, since the other end 113b of the shift lever 113 has not completely moved rightward, the plunger 1 with the one end 113a being locked is locked.
05 has not completely moved to the left. Therefore, FIG.
The main movable electrode 104c of the contact portion 104 in FIG. 1 is the battery-side fixed electrode 104a and the electric motor-side fixed electrode 104.
There is no contact with b, and the contact part 104 is never closed. Therefore, the amateur shaft 103c keeps a slow rotation, and this rotation causes the pinion 115 to rotate.
Since the pinion 115 is slowly rotated, the pinion 115 can be completely engaged with little impact.

When the pinion 115 is completely meshed with the ring gear 116, the main movable electrode 104c of the contact portion 104.
Is the battery-side fixed electrode 104a and the motor-side fixed electrode 1
04b is contacted, and the contact part 104 is closed. As a result, electric power is supplied from the battery 102 to the field coil 103a and the amateur coil 103b of the electric motor 103 via the contact portion 104, and the amateur shaft 10
3c rotates fully. Further, when the contact portion 104 is closed, the potential difference between both ends of the pull-in coil 106a disappears, so that no current flows in the pull-in coil 106a, but the current continues to flow in the grounded hold coil 106b. State is retained.

When the engine ignites and starts rotating,
The key switch 111 is turned off to cut off the power supply to the drive coil 106 of the main switch 107. The electromagnetic force of the drive coil 106 whose power supply has been cut off disappears, and the plunger 105 moves to the right in FIG. 9 to return to the original state. By this movement, the pinion 115 is moved to the left by the rotation of the shift lever 113, disengaged from the ring gear 116, the contact portion 104 is opened, and the rotation of the amateur shaft 103c of the electric motor 103 is stopped.

[0018]

However, the auxiliary switch 108 has the auxiliary contact portion 1 made of a conductive metal.
09, auxiliary drive coil 110, and metal parts such as an iron core for concentrating magnetic flux are often used, and the weight tends to increase. Therefore, there is a problem in that much power is consumed to drive the auxiliary movable electrode 109c, and the engine cannot be efficiently started.

Further, since a large amount of current is supplied to the auxiliary drive coil 110 in this way, when the energization of the auxiliary drive coil 110 is cut off by the key switch 111, a large surge voltage is generated in the auxiliary drive coil 110, for example, engine control. There is a problem that the electronic parts connected to the battery 102 such as the unit may be adversely affected.

Further, since the protection relay 112 is a safety device for preventing a failure of the starting electric motor device 101,
Although it needs to be attached, a new space is required to attach it, and it takes time and effort to connect the auxiliary switch 108 with the auxiliary switch 108, and there is a limit to downsizing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to obtain a starting electric motor device which can miniaturize an auxiliary switch to enable efficient engine starting. And

[0022]

A starting motor device according to the present invention includes a power source, an electric motor for starting an engine, and
A contact portion electrically connected to the electric motor and the power source,
It has a plunger whose one end is connected to the contact part, and a drive coil which reciprocates the plunger to open and close the contact part, and supplies electric power from the power supply to the electric motor by closing the contact part. And an auxiliary switch electrically connected to the main switch for starting the electric motor and the drive coil and the power supply, and for cutting off or supplying electric power from the power supply to the drive coil to open and close the contact portion of the drive coil. And the auxiliary switch is
It has a control circuit section that outputs an operation signal based on the input of a start signal from the outside, and a semiconductor relay section that is electrically connected to the power supply and the drive coil and that switches according to the input of the operation signal. .

The control circuit section and the semiconductor relay section are housed together in an electrically insulating case.

Further, one end is locked to the other end of the plunger and is connected to the electric motor with a shift lever which is rotated by the reciprocating movement of the plunger, and the other end of the shift lever is abutted. An axial moving body having a pinion that meshes with a ring gear that is connected to the contact portion and the engine, and that reciprocates in the axial direction by the rotation of the shift lever, and the pinion moves by the movement of the plunger. The contact portion is adapted to be closed when it is completely meshed with the gear.

Further, the semiconductor relay section has an electric output section for outputting an electric signal based on the amount of current passing through the semiconductor relay section and a potential in the semiconductor relay section, and the control circuit section has the electric signal. A temperature signal detected by a temperature sensor that calculates the amount of heat generated by energization of the electric motor based on the input of Based on the input of, the amount of heat released from the electric motor is calculated, the remaining amount of heat is calculated by subtracting the amount of released heat from the total amount of heat, and when the remaining amount of heat exceeds a predetermined value. The output of the operation signal is stopped.

The semiconductor relay section has an electric output section for outputting a current signal based on the amount of current flowing through the semiconductor relay section, and the control circuit section changes load on the electric motor due to ignition of the engine. Is reduced, and the fluctuation of the current signal input to the control circuit section is almost eliminated, the output of the operation signal is stopped.

The semiconductor relay section has an electric output section for outputting an electric signal based on the amount of current flowing through the semiconductor relay section and the potential at the semiconductor relay section, and the control circuit section has the electric signal. The amount of current supplied to the electric motor is calculated based on the input of, and when the state where the amount of current supplied to the electric motor exceeds a predetermined value continues for a predetermined time or more, the output of the operation signal is stopped. ing.

The control circuit section outputs the operation signal as a large number of pulse signals, and the semiconductor relay section switches according to the pulse signals,
The current supplied to the drive coil is PWM-controlled.

Further, a fuse is electrically interposed between the semiconductor relay section and the power source or between the semiconductor relay section and the drive coil.

Further, the semiconductor relay portion is in contact with a member having good thermal conductivity fixed in contact with the electric motor.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The same or equivalent members and parts as those of the conventional example are designated by the same reference numerals. Embodiment 1. 1 is a wiring diagram of a starting electric motor device according to a first embodiment of the present invention. In FIG. 1, the starting electric motor device 1 includes an auxiliary switch 2 having a semiconductor relay section 3 and a control circuit section 4 electrically connected to the semiconductor relay section 3. The semiconductor relay unit 3 has a switching unit 5 using a transistor or the like. For example, in a MOS FET, the gate electrode G is the control circuit unit 4, the drain electrode D is the battery 102, and the source electrode S is the drive coil 106. Are each electrically connected to. The control circuit unit 4 is grounded from the ground terminal E, and is electrically connected to the external key switch 111 from the switch terminal SW. The control circuit section 4 receives the drain electrode D and the drain electrode D based on the input of the start signal by the closing operation of the key switch 111. A gate voltage, which is an operation signal for switching between the source electrodes S, is output to the MOS FET.

FIG. 2 is a perspective view showing the outer shape of the auxiliary switch of the starting motor device according to the first embodiment of the present invention, and FIG. 3 is a cutaway perspective view showing the internal structure of the auxiliary switch of FIG. is there. In the figure, the auxiliary switch 2 has a case 7 in which a substrate 6 on which a control circuit unit 4 is mounted and a semiconductor relay unit 3 are housed together. The case 7 is a metal member 8 having good heat conductivity and formed to have a space inside.
And the resin 9 are integrally formed. The metal member 8 has a mounting portion 8a made of the same material on the outer wall, and the mounting portion 8a is exposed without being in close contact with the resin 9. Also, a part of the inner surface of the case 7 is exposed without being in close contact with the resin 9. The semiconductor relay unit 3 is connected and fixed to the substrate 6,
The semiconductor relay portion 3 is adhered and fixed to the exposed portion of the metal member 8 on the inner surface of the case 7 via a heat sink 10 made of aluminum and an electrically insulating ceramic plate 11. Further, the drain electrode D and the source electrode S of the semiconductor relay unit 3 inside the case 7, and the switch terminal SW of the control circuit unit 4
And the drain electrode D on the outer wall of the case 7 so that the ground terminal E can be electrically connected to the external circuit of the case 7.
The source electrode S, the switch terminal SW, and the ground terminal E are exposed and fixed. Such an auxiliary switch 2 is
As shown in FIG. 4, the mounting portion 8a is fixed to the outer wall of the main switch 107 by a screw 122 in a state of being in contact therewith. Other configurations are similar to those of the conventional example, and the description thereof will be omitted.

The starting electric motor device 1 having such a structure is
When the key switch 111 closes, current flows from the battery 102 to the control circuit unit 4. This energization serves as a start signal, and an operation signal is output to the switching section 5 of the semiconductor relay section 3 based on the input of this start signal. The operation signal is a gate voltage, and switches between the drain electrode D and the source electrode S. The subsequent operation is similar to that of the conventional example.

Therefore, the auxiliary switch 2 can be composed of small and light parts such as the semiconductor relay portion 3 and the substrate 6 on which the control circuit portion 4 is mounted as compared with the conventional one, so that the auxiliary switch 2 can be made smaller and lighter. it can.

Further, in the switching operation of the auxiliary switch 2, it is not necessary to move the contact point by exciting the coil as in the conventional case, so that less power is consumed and more electric power of the battery 102 can be supplied to the electric motor 103. ,
The engine can be efficiently started. Further, unlike the conventional case, since there is no auxiliary drive coil, surge voltage is not generated, and adverse effects on electronic parts connected to the battery 102 are eliminated.

Further, the semiconductor relay section 3 is a heat sink 1.
Since it is provided on the ceramic plate 11 that is in contact with the metal member 8 through the zero, leakage of electricity from the semiconductor relay unit 3 to the metal member 8 is prevented, and heat generated in the semiconductor relay unit 3 is applied to the heat sink 10 and the ceramic. The air is transmitted through the plate 11 and the metal member 8 and discharged to the outside air and the outer wall of the bracket near the main switch 107.

Since the current supplied to the control circuit section 4 is small, a switch such as a touch switch which can be adapted to only a weak current can be used without using the key switch 111.

Further, since the semiconductor relay section 3 can be operated with a weak voltage, it does not depend on the energization from the battery 102 due to the closing operation of the key switch 111, but from another control device such as an engine control unit. It is also possible to directly input a weak voltage or the like to the semiconductor relay section 3 as a start signal.

Further, assuming that the switching unit 5 of the semiconductor relay unit 3 is electrically connected to the positive electrode of the battery 102 through the drive coil 106 as shown in FIG. The energization of the pull-in coil 106a cannot be controlled, and the drive coil 106 has only the hold coil 106b. Although the engine can be started with such a configuration as well, the armature shaft 103c of the electric motor 103 cannot be slowly rotated by the pull-in coil 106a, and the pinion 115 and the ring gear 116 may not mesh smoothly. is there. Further, since the drive coil 106 of the conventional starting motor device 101 has the pull-in coil 106a and the hold coil 106b, the auxiliary switch 2 applicable to the main switch 107 having such a drive coil 106 is more compatible. It is convenient from the viewpoint of.
Therefore, as shown in FIG. 1, it is desirable that the semiconductor relay section 3 is electrically interposed between the positive electrode of the battery 102 and the drive coil 106.

Further, the control circuit section 4 outputs a gate voltage which is an operation signal to the switching section 5 as a pulse signal, and the switching section 5 of the semiconductor relay section 3 switches in accordance with the pulse signal. May be Since the switching unit 5 is a semiconductor such as a transistor, the switching unit 5 can be applied to control with a high operation speed such as a pulse signal. By enabling such a switching operation, the current supplied to the drive coil 106 of the main switch 107 can be PWM-controlled. By performing PWM control of the energization current of the drive coil 106, it is possible to suppress the power consumed by the drive coil 106, reduce the electromagnetic attraction force, and reduce the moving speed of the plunger 105. Therefore, the moving speed of the pinion 115 that moves in conjunction with the movement of the plunger 105 is also reduced, and the impact due to the collision between the pinion 115 and the ring gear 116 can be reduced.

Further, when the contact portion 104 is in the closed state, the electromagnetic attraction force of the drive coil 106 does not need to be large enough to attract and move the plunger 105 as in the closing operation of the contact portion 104. Since a suction force sufficient to maintain the closed state of 104 is sufficient, the power consumption of the drive coil 106 can be further reduced by PWM control at this time. As a result, heat generation of the drive coil 106 can be suppressed, and a large amount of electric power can be supplied to the electric motor 103 correspondingly, so that the engine can be efficiently started.

Embodiment 2. FIG. 6 is a connection diagram showing a configuration of a starting electric motor device according to Embodiment 2 of the present invention. In FIG. 6, the semiconductor relay unit 3 of the auxiliary switch 2
Is a switching unit 5 which is, for example, a MOSFET, and is connected to the switching unit 5, and detects the magnitude of the current flowing between the drain electrode D and the source electrode S of the switching unit 5 and the drain voltage to output an electric signal. It has an electric output section 20 which is a current voltage detection circuit. The electric output unit 20 is electrically connected to each of the switching unit 5 and the control circuit unit 4. Also, the electric motor 1
Near 03 (for example, inside case 7 of auxiliary switch 2)
Is provided with a temperature sensor, which measures the ambient temperature of the electric motor 103 and outputs a temperature signal to the control circuit unit 4.

The control circuit section 4 is adapted to calculate the magnitude of the current flowing through the field coil 103a and the armature coil 103b of the electric motor 103 as follows. FIG. 7 is an equivalent circuit in a state of auxiliary rotation in which the drive coil 106 is energized but the contact portion 104 of the main switch 107 is not closed. 6 and 7, the control circuit unit 4 has P coil resistance Rp of the pull-in coil 106a and hold coil 1 in advance.
The value of the H coil resistance Rh of 06b and the electric motor internal resistance Rst which is a combined resistance of the field coil 103a and the armature coil 103b of the electric motor 103 are stored.

Here, the internal resistance and electromotive force of the battery 102 are Rb and V0, respectively, the wiring (B circuit wiring) resistance from the positive electrode of the battery 102 to the battery side fixed electrode 104a of the contact portion 104 is R1, and the positive electrode of the battery 102 is positive. The resistance from the wiring to the switch terminal SW of the control circuit unit 4 (S circuit wiring) is R2, and the substrate impedance of the control circuit unit 4 is R3. Further, the drain voltage of the switching unit 5 in the auxiliary rotation state shown by the equivalent circuit shown in FIG. 7 is Vd1, and the amount of current flowing between the drain electrode D and the source electrode S of this switching unit 5 is I1.

First, the P coil resistance Rp and the H coil resistance R
The combined resistance R0 of h and the internal resistance Rst of the motor is calculated by the equation (1) using the stored data. R0 = (Rp + Rst) × Rh / (Rp + Rst + Rh) (1) Further, equations (2) and (3) are derived from the equivalent circuit of FIG. 7. V0 = (Rb + R1 + R0) × I1 ... (2) Vd1 = R0 × I1 ... (3) Further, the equation (4) is derived from the equations (2) and (3). Rb + R1 = (V0-Vd1) / I1 ... (4) Since the control circuit unit 4 has acquired I1 and Vd1 based on the input of the electric signal from the electric output unit 20, the B circuit wiring is obtained by the formula (4). A combined resistance of the resistance Rb and the battery internal resistance R1 is calculated.

FIG. 8 shows the contact portion 1 of the main switch 107.
Reference numeral 04 is an equivalent circuit in a state where the armature shaft 103c of the electric motor 103 is fully closed and fully rotated.
In FIG. 8, the drain voltage of the switching unit 5 in the full rotation state is Vd2, and the amount of current flowing through the B circuit wiring is I2.
I am trying. This I2 is the internal resistance Rst of the motor in the circuit.
And the H coil resistance Rh, the amount of current flowing through the electric motor internal resistance Rst is extremely larger than the amount of current flowing through the H coil resistance Rh. Therefore, ignoring the amount of current flowing through the H coil resistance Rh, I2 is the internal resistance Rst of the motor
There is no problem in treating it as the amount of current flowing through.

Thus, in order to calculate I2, the equation (5) is first derived from the equivalent circuit of FIG. I2 = (V0-Vd2) / (Rb + R1) (5) Then, in the equation (5) derived from the equivalent circuit of FIG. 8, V0 and (Rb + R) calculated by the equations (2) and (4) are added.
I2 is calculated by substituting 1) and Vd2 acquired by the control circuit unit 4 based on the input of the electric signal from the electric output unit 20.

In the control circuit section 4, the temperature of the electric motor 103, the ambient temperature, and the electric motor 1 having that temperature are set in advance.
The temperature rise value with respect to the amount of heat entering 03 and the temperature decrease value of the electric motor 103 due to the heat amount released from the electric motor 103 at that temperature to the ambient air are stored as data. Then, the control circuit unit 4 causes the I
The amount of heat generation of the electric motor 103 is calculated from the value of 2 and the internal resistance Rst of the electric motor, and the amount of heat generation is integrated according to the time during which electricity is supplied to obtain the total amount of heat, and the temperature rise value of the electric motor 103 is acquired from the stored data. Has become. Further, the control circuit unit 4 acquires the value of the ambient temperature based on the input of the temperature signal from the temperature sensor, and acquires the temperature decrease value of the electric motor 103 at the temperature of the electric motor 103 at the time of the acquisition, from the stored data. It is like this. Then, the control circuit unit 4
Is designed to specify the temperature of the electric motor 103 from the ambient temperature at the time when the power is turned on and the acquired temperature rise value and temperature decrease value of the electric motor 103. Further, the control circuit unit 4 stops outputting the operation signal when the specified temperature of the electric motor 103 reaches a temperature at which thermal damage such as predetermined burning may occur. Other configurations are similar to those of the first embodiment.

The starting electric motor device 1 configured as described above
Can calculate the magnitude of the current I2 flowing through the internal resistance Rst of the electric motor in the full-rotation state, so that the temperature of the electric motor 103 can be specified and the electric motor 103 can be prevented from burning.

Note that the control circuit section 4, when there is almost no fluctuation (hereinafter referred to as pulsation) in the magnitude of the energizing current I2 of the motor internal resistance Rst in the full-power rotation state,
The output of the operation signal may be stopped. When the engine is still in the cranking state without being ignited, it is driven by the rotational force of the amateur shaft 103c of the electric motor 103. At this time, the compression stroke and the expansion stroke are repeated in the engine, the load of the electric motor 103 is large in the compression stroke, and the electric motor 1 is in the expansion stroke.
The load of 03 becomes small. The magnitude of the energizing current I2 naturally changes due to the change of the load, and the energizing current I2 becomes large in the compression stroke and becomes small in the expansion stroke, causing pulsation. When the engine ignites and starts to drive by itself,
The amateur shaft 103c of the electric motor 103 is rotated by driving the engine. At this time, the electric motor 1
In No. 03, there is no load, and the pulsation of the current I2 is almost eliminated. Therefore, when the pulsation of the energizing current I2 is almost eliminated, it can be determined that the engine has ignited, and by stopping the output of the operation signal to the semiconductor relay section 3 at this time, the key switch 111 is not ignited. When the engine is turned off, or on the contrary, even if the engine is ignited, the key switch 111 is kept on and the extra power is not consumed.

Since this pulsation is generated not only in the current I2 flowing through the internal resistance Rst of the motor but also in the current flowing between the drain electrode D and the source electrode S of the switching section 5, the electric output section 20 outputs only the current signal. Even if the current is output to the control circuit unit 4, the same effect can be obtained by stopping the output of the operation signal when the pulsation of the current is almost eliminated.

Also, when the engine or the electric motor 103 is locked for some reason, the pulsation of the electric current flowing through the electric motor internal resistance Rst or the current flowing between the drain electrode D and the source electrode S of the switching section 5 is almost eliminated. Therefore, by stopping the output of the operation signal from the control circuit unit 4 at this time, damage such as burning due to overload of the electric motor 103 can be prevented. Further, when locked in this manner, the control circuit unit 4 outputs an operation signal when the energizing current I2 of the motor internal resistance Rst exceeds the overload current value and this state continues for a predetermined time (for example, 1 s). Even if it is stopped, the electric motor 10
The damage of 3 can be prevented.

Further, the drain electrode D of the switching section 5
And the positive electrode of the battery 102, or the switching unit 5
A fuse may be electrically interposed between the source electrode S and the drive coil 106. With such a configuration, even when the semiconductor relay unit 3 fails and the switching unit 5 is always closed, for example, when locked as described above, a large current flows due to overload and the fuse blows. It is possible to prevent damage to the electric motor 103.

[0054]

As is apparent from the above description, the starting electric motor device according to the present invention includes a power source, an electric motor for starting an engine, a contact portion electrically connected to the electric motor and the electric power source, and the contact. A plunger whose one end is connected to the portion, and a drive coil that reciprocates the plunger to open and close the contact portion, and supplies electric power from the power source to the electric motor by closing the contact portion, A main switch for starting the electric motor, and an auxiliary switch electrically connected to the drive coil and the power supply for cutting or supplying electric power from the power supply to the drive coil to open and close the contact portion of the drive coil. The auxiliary switch is provided with a control circuit section that outputs an operation signal based on an input of a start signal from the outside, and an electrically connected to the power source and the drive coil. It is continued, because it has a semiconductor relay unit for switching the input of the operation signal,
The power consumption for the switching can be reduced, and the engine can be efficiently started.

Also, since the control circuit section and the semiconductor relay section are housed together in an electrically insulating case, it is possible to obtain the auxiliary switch which is small in size and light in weight and easy to handle.

Further, one end is locked to the other end of the plunger, is connected to the electric motor with a shift lever which is rotated by the reciprocating movement of the plunger, and the other end of the shift lever is abutted. An axial moving body having a pinion that meshes with a ring gear that is connected to the contact portion and the engine, and that reciprocates in the axial direction by the rotation of the shift lever, and the pinion moves by the movement of the plunger. Since the contact portion is closed when it is completely meshed with the gear, there is no possibility that the meshing state is unstable and the pinion or the ring gear is damaged when the electric motor is fully rotated.

Further, the semiconductor relay section has an electric output section for outputting an electric signal based on the amount of current flowing through the semiconductor relay section and a potential in the semiconductor relay section, and the control circuit section has the electric signal. A temperature signal detected by a temperature sensor that calculates the amount of heat generated by energization of the electric motor based on the input of Based on the input of, the amount of heat released from the electric motor is calculated, the remaining amount of heat is calculated by subtracting the amount of released heat from the total amount of heat, and when the remaining amount of heat exceeds a predetermined value. Since the output of the operation signal is stopped, it is possible to prevent the harmful effects such as the burning due to the temperature rise of the electric motor.

Further, the semiconductor relay section has an electric output section for outputting a current signal based on the amount of current flowing through the semiconductor relay section, and the control circuit section has load fluctuation of the electric motor due to ignition of the engine. Becomes smaller, the output of the operation signal is stopped when there is almost no fluctuation in the current signal input to the control circuit unit, so that ignition of the engine can be reliably confirmed, It is possible to prevent the output of the operation signal from being stopped even when the engine is not ignited, or that the operation signal is still being output even when the engine is ignited.

Further, the semiconductor relay section has an electric output section for outputting an electric signal based on the amount of current flowing through the semiconductor relay section and the potential in the semiconductor relay section, and the control circuit section has the electric signal. The amount of current supplied to the electric motor is calculated based on the input of, and when the state where the amount of current supplied to the electric motor exceeds a predetermined value continues for a predetermined time or more, the output of the operation signal is stopped. Therefore, it is possible to prevent the harmful effects such as baking due to the temperature rise of the electric motor, and the damage of the pinion, the ring gear and the like which are interlocked with the electric motor.

The control circuit section outputs the operation signal as a large number of pulse signals, and the semiconductor relay section switches according to the pulse signals,
Since the current supplied to the drive coil is PWM-controlled, the moving speed of the plunger is reduced, the power consumption of the drive coil is reduced, and the power of the power supply can be efficiently consumed. Further, since the moving speed of the plunger is reduced, the impact due to the collision of the pinion and the ring gear is reduced, and the pinion and the ring gear can be prevented from being damaged.

Further, since the fuse is electrically interposed between the semiconductor relay portion and the power source or between the semiconductor relay portion and the driving coil, for example, the semiconductor relay portion is damaged and is closed. Even when it has solidified, when the electric motor, the engine, etc. are locked,
When the fuse is blown by the overload current and the electric motor is stopped, the electric motor and the like can be prevented from being damaged.

Further, since the semiconductor relay portion is in contact with the member having good thermal conductivity fixed in contact with the electric motor, the heat generated in the semiconductor relay portion is released to the electric motor and the outside air, It is possible to prevent the temperature of the semiconductor relay section from rising and damaging it.

[Brief description of drawings]

FIG. 1 is a wiring diagram of a starting electric motor device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an outer shape of an auxiliary switch of the starting electric motor device according to the first embodiment of the present invention.

FIG. 3 is a cutaway perspective view showing the internal structure of the auxiliary switch of FIG.

FIG. 4 is a side view showing the outer appearance of the starting electric motor device according to the first embodiment of the present invention.

FIG. 5 is a connection diagram of a starting electric motor device in which a drive coil is electrically connected between a battery and a semiconductor relay unit.

FIG. 6 is a connection diagram showing a configuration of a starting electric motor device according to a second embodiment of the present invention.

FIG. 7 is an equivalent circuit in a state of auxiliary rotation.

FIG. 8 is an equivalent circuit in the state of full rotation.

FIG. 9 is a cross-sectional view of essential parts showing the configuration of a conventional starting motor device.

FIG. 10 is a side view showing the appearance of FIG.

FIG. 11 is a wiring diagram of a conventional starting electric motor device.

FIG. 12 is a perspective view showing the outer shape of a conventional auxiliary switch.

[Explanation of symbols]

1 Starting Motor Device, 2 Auxiliary Switch, 3 Semiconductor Relay Section, 4 Control Circuit Section, 5 Switching Section, 7
Case, 20 Electric output part, 102 Battery (power supply), 103 Electric motor, 104 Contact part, 105 Plunger, 106 Drive coil, 107 Main switch, 113 Shift lever, 114 Abutment part, 115
Pinion, 116 ring gear, 117 axial moving body.

Claims (9)

[Claims] 1. A power source, an electric motor for starting an engine, a contact portion electrically connected to the electric motor and the power source,
It has a plunger whose one end is connected to the contact part, and a drive coil which reciprocates the plunger to open and close the contact part, and supplies electric power from the power supply to the electric motor by closing the contact part. A main switch for starting the electric motor, and an auxiliary switch electrically connected to the drive coil and the power supply for cutting off or supplying electric power from the power supply to the drive coil to open and close the contact portion of the drive coil. The auxiliary switch is electrically connected to the power supply and the drive coil, and switches by a control circuit unit that outputs an operation signal based on an input of a start signal from the outside. A starting motor device having a semiconductor relay section. 2. The starting motor device according to claim 1, wherein the control circuit unit and the semiconductor relay unit are housed together in an electrically insulating case. 3. A shift lever, one end of which is locked to the other end of the plunger and which is rotated by reciprocating movement of the plunger, is connected to the electric motor, and the other end of the shift lever is in contact with the shift lever. An axial moving body having a pinion that meshes with a contact portion and a ring gear connected to the engine and that reciprocates in the axial direction by the rotation of the shift lever, and the pinion moves the ring by the movement of the plunger. The contact portion is closed when completely meshed with a gear.
The starting electric motor device according to. 4. The semiconductor relay unit includes an electric output unit that outputs an electric signal based on the amount of current flowing through the semiconductor relay unit and the potential of the semiconductor relay unit, and the control circuit unit includes the electric signal. A temperature signal detected by a temperature sensor that calculates the amount of heat generated by energization of the electric motor based on the input of Based on the input of, the amount of heat released from the electric motor is calculated, and the remaining amount of heat is calculated by subtracting the released amount of heat from the total amount of heat, and when the remaining amount of heat exceeds a predetermined value. 2. The output of the operation signal is stopped.
4. The starting electric motor device according to claim 3. 5. The semiconductor relay section has an electric output section that outputs a current signal based on the amount of current that flows through the semiconductor relay section, and the control circuit section changes load of the electric motor due to ignition of the engine. 5. The output of the operation signal is stopped when the change of the current signal input to the control circuit section becomes almost zero when the value of the current signal becomes small. A starting electric motor device according to claim 1. 6. The semiconductor relay unit includes an electric output unit that outputs an electric signal based on the amount of current flowing through the semiconductor relay unit and the potential of the semiconductor relay unit, and the control circuit unit includes the electric signal. The amount of current supplied to the electric motor is calculated based on the input of, and when the state where the amount of current supplied to the electric motor exceeds a predetermined value continues for a predetermined time or more, the output of the operation signal is stopped. The starting electric motor device according to any one of claims 1 to 5, wherein 7. The control circuit section outputs the operation signal as a large number of pulse signals, and the semiconductor relay section switches in accordance with the pulse signals to perform PWM control of a current supplied to the drive coil. The starting electric motor device according to any one of claims 1 to 6, wherein: 8. Between the semiconductor relay unit and the power supply,
Alternatively, a fuse is electrically interposed between the semiconductor relay unit and the drive coil.
A starting electric motor device according to claim 7. 9. The starting electric motor according to claim 1, wherein the semiconductor relay portion is in contact with a member having good heat conductivity fixed in contact with the electric motor. apparatus.