JPH0643826B2 - Engine starter controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention detects the rotation of an engine starter control device, particularly an engine starter, and controls the engine starter based on the detection signal. In an engine starter control device, a magnet is fixed to a rotating body of the engine starter, and a hall element is provided on a stationary body of the engine starter so as to face the magnet, and the engine based on the output of the hall element. The present invention relates to an engine starter control device that controls a starter.

(Problems to be Solved by Prior Art and Invention) Generally, when starting an engine, by closing a key switch for starting the engine, for example, a pinion gear on the starter side pops out and the pinion gear The gear engages with the ring gear on the engine side and activates the starter. That is, the rotational force of the starter is transmitted to the engine to drive the engine. And
When the engine starts to rotate normally by itself, the power supply to the starter is stopped and the engagement between the pinion gear and the ring gear is released. After this, the starter stops completely after a momentary rotation. That is, even after the key switch is opened, the starter continues inertial rotation for a predetermined time. If the key switch is turned on and the pinion gear meshes with the ring gear during coasting of the starter when the engine is not started correctly, the pinion gear or ring gear will be damaged. Due to some danger, the engine could not be started for some reason and the key
Even when the switch is closed, it is necessary to prevent the starter from jumping in by preventing the starter from starting during the inertial rotation of the starter.

A means as shown in FIG. 5 is known as a means for preventing the starter from jumping in during the inertia rotation. Fifth
In the conventional example shown in the figure, the power supply to the starter is blocked based on the counter electromotive voltage of the starter motor during inertial rotation. In the figure, reference numeral 51 is an engine gear for starting an engine (not shown), and 52 is a starter, which includes a starter motor 52-1 and the starter motor 52.
A pinion gear 52-2 driven by -1, a pinion shift lever 52-3 for projecting the pinion gear 52-2 to mesh with the engine gear 51, 53 is Engage switch part, pull coil 53-1, holding coil 53-2, movable core 53-
3, a starter switch 53-4, a key switch 54, a power supply battery 55, a control circuit unit 56, a reference voltage battery 56-1, a transistor 56-2, and a pull-up device described above. The terminal voltage of the starter motor 52-1 and the reference voltage battery 56 transmitted via the coil 53-1
-1, which is composed of a comparator 56-3 for controlling the transistor 56-2 by comparing with a reference voltage supplied by -1, a power switch 56-4, and a resistor 56-5.

In FIG. 5, a counter electromotive voltage is generated in the starter motor 52-1 during inertial rotation of the starter 52, and the reference voltage supplied to the comparator 56-3 by the reference voltage battery 56-1. The voltage is set to a value lower than the counter electromotive voltage of the starter motor 52-1. Therefore, the starter 5 above
Since the base voltage is not supplied to the transistor 56-2 during the inertial rotation of 2, the power switch 56-4 does not turn on even if the key switch 54 is closed. That is, during the inertial rotation of the starter 52, the starter 5
2 is activated to prevent the pinion gear 52-2 from protruding. However, the conventional example shown in FIG. 5 prevents the starter from jumping in during inertial rotation.
Since it is performed based on the back electromotive force of the motor,
There is an undesired problem that it is difficult to obtain sufficient accuracy.

Therefore, in order to solve the above-mentioned problems, a magnetic pick-up in which a detection winding is wound on the core to detect the rotation speed of the starter is provided inside the starter.
A means for preventing the starter from jumping in during inertial rotation of the starter based on a detection signal of up is proposed, but the means using the proposed magnetic pick-up not only makes the rotation detection device large-sized. However, it has the disadvantage of being expensive.

(Means for Solving Problems) An object of the present invention is to solve the above problems. Therefore, the engine starter control device of the present invention includes a rotor arranged in a starter casing. A pinion gear provided on a rotor shaft of the rotor, and a reduction gear having a reduction gear on an inner peripheral surface of a bowl-shaped body meshed with the pinion gear and rotatable about the reduction shaft And an engine starter control device for controlling the engine starter based on a detection signal of the rotation detection means for detecting the rotation of the engine starter. As the rotation detecting means, a magnet fixed to the outer surface of the bowl-shaped body is provided, and a position inside the starter casing facing the magnet. It is characterized in that it has a hall element fixed to a stationary body, and is configured to control the engine starter based on the output of the hall element. Hereinafter, description will be given with reference to the drawings.

(Embodiment) FIG. 1 is an explanatory view of an embodiment of the rotation detecting means according to the present invention. FIG. 1 (A) is a main part configuration diagram, and FIG. 1 (B) is a first embodiment.
FIG. 2A is a front view of the plastic magnet indicated by the arrow AA in FIG. 2, FIGS. 2A to 2C are explanatory views of another embodiment of the rotation detecting means according to the present invention, and FIG. FIG. 3 (A) is a block diagram, and FIGS. 3 (B) and 3 (C) are time charts for explaining the operation of the embodiment shown in FIG. 3 (A). FIG. 4 is a diagram for explaining another embodiment of the control circuit unit according to the present invention. FIG. 4 (A) is a block diagram of an embodiment of the reference voltage generating circuit, and FIG. FIG. 4 (A) shows a reference voltage characteristic diagram in the illustrated embodiment.

The rotation detecting means of the engine starter according to the present invention comprises:
A plastic magnet that is fixed to a rotating body of the engine starter (for example, a rotating shaft, a reduction gear, a clutch, etc.) and rotates in response to the rotation of the engine starter, and a change in the magnetic field due to the rotation of the plastic magnet. It is configured by combining with a Hall element for detection. Hereinafter, a detailed description will be given with reference to FIGS. 1 and 2.

In the embodiment shown in FIG. 1, reference numeral 1 in the drawing is a plastic magnet, 2 is a hall element, 3 is a starter casing,
4 is a rotor, 5 is a rotor shaft, 6 is a pinion gear, 7 is a reduction shaft, 7'is a reduction unit, and 8 is a reduction gear.

In FIG. 1 (A), a pinion gear 6 is provided at an end of a rotor shaft 5 which is a rotation shaft of a rotor 4 of a starter motor. The reduction shaft 7 for transmitting the rotation of the starter motor has a reduction gear 8 formed at its one end in a so-called bowl shape and having an inner peripheral surface with a reduction gear 8 meshing with the pinion gear 6. 7 ', and the pinion gear 52-2 of FIG. 5 described at the beginning of the present specification is provided at the right end (not shown). That is,
The engine starter shown in FIG. 1 (A) to which the present invention is applied is configured such that the rotation of the rotor 4 of the starter motor is transmitted to the pinion gear 52-2 via the reduction shaft 7. However, other mechanisms not shown, that is, the starter 52 and the engagement switch section 53 shown in FIG. 5, can be considered to be the same as those in the conventional example shown in FIG.

In the embodiment shown in FIG. 1, the plastic magnet 1 constituting the rotation detecting means according to the present invention has a circle in which S poles and N poles are alternately arranged as shown in FIG. 1B. It is a plate-shaped plastic magnet and is fixed to the speed reducer 7 '. That is, the plastic magnet 1 rotates at a rotation speed corresponding to the rotation speed of the starter motor. Further, the Hall element 2 is fixed at a stationary position facing the plastic magnet 1 at a predetermined interval.
Therefore, from the Hall element 2, an output having a frequency corresponding to the rotational speed of the rotor 4, that is, the rotational speed of the starter motor and the magnetic pole number of the plastic magnet 1 is obtained. Then, based on the output of the Hall element 2, the control of the engine starter can be accurately performed by performing the control described later with reference to FIG. 3 or FIG. Further, since the plastic magnet 1 has a thin disk shape and is inexpensive, and the Hall element 2 is also small, the rotation detecting means according to the present invention is inexpensive and compact.

Next, the embodiment shown in FIG. 2 will be described. The second
2A is a front view of the plastic magnet indicated by an arrow AA in FIG. 2A, and FIG.
FIG. (C) shows a side view. The reference numeral 1'in the figure corresponds to the plastic magnet, and the other reference numerals correspond to those in FIG.

The embodiment shown in FIG. 2 is different from the embodiment shown in FIG. 1 in the shape and installation position of the plastic magnet 1 ', but the effect is the same as that of the embodiment shown in FIG. That is, in the embodiment shown in FIG. 2, as shown in FIGS. 2B and 2C, a disk-shaped plastic magnet 1 having S poles and N poles alternately arranged. ′ Is fixed on the outer peripheral surface of the speed reducing portion 7 ′, and the hall element 2 is fixed at a stationary position facing the plastic magnet 1 ′.

The rotation detecting means according to the present invention has been described above.
Next, the control mode of the starter performed based on the output of the hall element 2 will be described with reference to FIGS. 3 and 4.

In FIG. 3 (A), reference numeral 2 in the figure is the Hall element (HIC) described above, 9 is an F / V converter for converting the output frequency of the Hall element 2 into a voltage, 10 is a comparator, and 11 is a reference voltage. Batteries, 12 to 14 are resistors, 15 and 16 are capacitors, 17 and 18 are differential shapers, 19 is a diode, 20 is a waveform shaping circuit, and a pulse signal having a period corresponding to the output frequency of the Hall element 2 is generated. What is output, 21 is a flip-flop, and 22 is an OR circuit. In the figure, is the key for starting the starter.
A switch input signal (hereinafter referred to as a key signal), the output of the comparator 10 is a starter automatic stop signal, and the output voltage of the F / V converter 9 is a reference voltage supplied by the reference voltage battery 11. When it is larger than the above, the output of the OR circuit 22 is an inertial rotation detection signal, and when the starter is inertially rotating when the key signal is input, it is substantially "H". It represents the level. When the key signal is input, power is supplied to the starter only when both the starter automatic stop signal and the inertial rotation detection signal are at the "L" level. The operation when the starter is stopped (1) and the starter coasts (2) in the embodiment shown in FIG. 3A will be described below with reference to FIGS. 3B and 3C. It should be noted that FIG. 3 (B) shows when the starter is stopped.
FIG. 3 (C) is a time chart diagram for explaining the operation in (1), and FIG. 3 (C) is a time chart diagram for explaining the operation during starter inertial rotation.

(1) Start up when the starter is stopped.

(A) Since the output of the Hall element 2 is "0" when the starter is stopped, the starter automatic stop signal output from the comparator 10 is at "L" level.

(B) When a key signal is input by turning on a key switch (not shown) for starting the starter, the key signal is output from the reset circuit including the resistor 13, the capacitor 15, and the differential shaper 17. The flip-flop 21 is reset by the reset signal (shown in FIG. 3 (B)), and the flip-flop 21 is reset.
Q output (shown in FIG. 3 (B)) becomes "L" level. At that time T ₀ , the input of the OR circuit 22 output via the differential shaper 18 becomes the “H” level for a time (for example, 0.1 seconds) determined by the resistor 14 and the capacitor 16, so that the output of the OR circuit 22 is output. That is, the D input (shown in FIG. 3B) of the flip-flop 21 becomes the "H" level. Since the starter is stopped at this time T ₀ , the pulse signal (shown in FIG. 3B) corresponding to the rotation speed of the starter output via the waveform shaping circuit 20 is not sent. . Therefore, at this time T ₀ , the starter automatic stop signal is “L”, but the inertia rotation detection signal output from the OR circuit 22 is “H” level, so that the power supply to the starter is blocked and The starter will not start. This state is the time T when the time T _s (for example, 0.1 seconds) determined by the resistor 14 and the capacitor 16 has elapsed.
Holds up to ₁ . That is, when a key switch (not shown) is turned on T ₀
The starter is not started up to ₁ .

(C) At the time point T ₁ , the output of the differential shaper 18 is inverted to the “L” level, and at this time, the Q output of the flip-flop 21 is also at the “L” level, so the output of the OR circuit 22, that is, the inertia. The rotation detection signal becomes "L" level. That is, at the time point T ₁ , both of the starter automatic stop signal and the inertial rotation detection signal become “L” level, so that the power supply inhibition to the starter is released and the starter is started. After that, a pulse signal as shown in FIG. 3B is input from the waveform shaping circuit 20 to the CK terminal of the flip-flop 21 at a cycle corresponding to the rotation speed of the starter.
The output of 2 continues to hold "L" level. Therefore, power supply to the starter is continued until the rotation speed of the starter reaches a predetermined rotation speed and the starter automatic stop signal is inverted to the "H" level.

(D) After starting the starter at the time point T ₁ ,
At the time when the output voltage of the F / V converter 9 rises in response to the increase in the rotation speed of the starter and exceeds the reference voltage supplied to the comparator 10 by the reference voltage battery 11, The output, that is, the starter automatic stop signal is inverted to the "H" level. Therefore, at this point, the power supply to the starter is stopped, and the meshing between the pinion gear 52-2 of the starter 52 shown in FIG. 5 and the ring gear 51 of the engine is released, as described at the beginning of this specification. It Then, the starter coasts for a predetermined time and then stops completely.

The output voltage of the F / V converter 9 corresponds to the rotational speed of the starter (to be precise, the rotational speed of the reduction shaft 7 in the embodiment shown in FIGS. 1 and 2). Therefore, if the rotation speed of the starter for allowing the engine to rotate properly by itself is, for example, 5000 rpm, the reference voltage value supplied from the reference voltage battery 11 is set to F when the rotation speed of the starter is 5000 rpm. It may be the same as the output voltage value of the / V converter 9.

(2) False start during starter inertial rotation.

When the power supply to the starter described in (1)-(d) above was stopped, the engine failed to rotate by itself for some reason, and the key switch for starting the starter was not turned on again during coasting of the starter. The operation when performed will be described.

(E) During the inertial rotation of the starter, a pulse signal as shown in FIG. 3C is input from the waveform shaping circuit 20 to the CK terminal of the flip-flop 21 at a cycle corresponding to the rotational speed of the inertial rotation. Has been done.

(F) Under this condition, when a key switch (not shown) for starting the starter is turned on and a key signal is input, as described in (1)-(b) above, The flip-flop 21 is reset and the Q output (shown in FIG. 3 (C)) becomes "L" level. At that time T ₀ , the output of the differential shaper 18 becomes “H” level, so the output of the OR circuit 22, that is, the inertial rotation detection signal and the D input of the flip-flop 21 (shown in FIG. 3C) are It becomes "H" level.

(G) On the other hand, the period T of the pulse signal (shown in FIG. 3 (C)) input to the CK terminal of the flip-flop 21 is determined from at least the time T _s (for example, 0.1 seconds) determined by the resistor 14 and the capacitor 16. If D is small, the D input of the flip-flop 21 is "H".
The next pulse signal is input to the CK terminal under the level condition. Therefore, at the time T ₂ when the pulse signal is input, the flip-flop 21
Q output (shown in FIG. 3 (C)) is inverted to "H" level, and the output of the OR circuit 22, that is, the inertia rotation detection signal and the D input of the flip-flop 21 are "H".
It becomes a level.

(H) After the time point T ₂ , unless the flip-flop 21 is reset, the OR circuit 22
Output, that is, the inertial rotation detection signal maintains the "H" level.

As described above, at time T ₀ when the key switch for starting the starter is turned on, the starter is coasting and the pulse signal (shown in FIG. 3 (C)) output from the waveform shaping circuit 20 is output. If the period T is less than the time T _s defined by the resistor 14 and the capacitor 16, the power supply to the starter is blocked. In addition,
The number of rotations of the starter, which is a condition for blocking power supply to the starter, will be described below with a specific example.

For example, when the rotation is detected by the detecting means as in the embodiment shown in FIG. 1, since the number of magnetic poles of the plastic magnet 1 is 10 as shown in FIG. 1 (B),
The pulse signal (shown in FIG. 3C) input to the CK terminal of the flip-flop 21 via the Hall element 2 and the waveform shaping circuit 20 is the starter (deceleration shaft 7 shown in FIG. 1A) 1 There are 20 pulses per revolution. The time T determined by the resistor 14 and the capacitor 16 is
Assuming that _s is set to 0.1 seconds, when the inertial rotation speed of the starter is 30 rpm or more, power is not supplied to the starter even if the key switch for starting the starter is turned on. .

The operation of the embodiment shown in FIG. 3A has been described above. However, since the reference voltage supplied to the comparator 10 in the embodiment shown in FIG. The rotation speed of the starter, which is a condition for stopping the power supply to the starter described in the section (4), is also fixed to correspond to the reference voltage. However, the rotation speed for the engine to rotate by itself differs depending on the outside air temperature. Therefore, it is desirable to control the number of rotations of the starter, which is a condition for stopping the power supply to the starter, in accordance with the outside air temperature.

In order to solve the above-mentioned demand, the embodiment shown in FIG. 4 (A) is a reference voltage battery 1 in the embodiment shown in FIG. 3 (A).
FIG. 3 is a configuration diagram of an embodiment of a reference voltage generation circuit installed in place of 1. Reference numeral 23 in the figure is a terminal and is shown in FIG.
What is connected to the (-) terminal of the comparator 10 in the illustrated embodiment, 24 is a thermistor, 25 is a diode, 26 is a battery, and 27 to 29 are resistors respectively. Less than,
The operation of the embodiment shown in FIG. 4A will be described with reference to the reference voltage characteristic diagram shown in FIG. In FIG. 4 (B), the vertical axis represents the voltage (Vt) at the terminal 23, and the horizontal axis represents the outside air temperature (° C).

In FIG. 4 (A), if the generated voltage of the battery 26 (hereinafter referred to as battery voltage) is V _L , the terminal voltage V _{t of the} terminal 23 is V _t.
In the range where V is higher than V _L , the terminal voltage V _t is equal to the reference voltage Vcc supplied to the resistor 27.
Is determined by the voltage division ratio of the parallel resistance value of the thermistor 24 and the resistor 29 and the resistance value of the resistor 27. However, when the outside air temperature becomes low (for example, −30 ° C. or higher) and the resistance value of the thermistor 24 becomes extremely larger than the resistance value of the resistor 28, the terminal voltage V _t becomes the resistance 2
It can be considered that it is determined by the voltage division ratio between 7 and the resistor 28.
Therefore, for example, when the outside air temperature is −30 ° C., the self-startable rotation speed of the engine is 6000 rpm, and when the outside air temperature is 30 ° C., the self-startable rotation speed of the engine is
Assuming 4000 rpm, the voltage V _H determined by the voltage division ratio between the resistor 27 and the resistor 28 is the F / V converter 9 shown in FIG. 3 (A) when the rotation speed of the starter is 6000 rpm.
So that the battery voltage V _L corresponds to the output voltage of the F / V converter 9 when the rotation speed of the starter is 4000 rpm, the temperature characteristics of the voltage V _L and the thermistor 24 are , The resistance values of the resistors 27 to 29 and the reference voltage Vcc may be set. As a result, the relationship between the terminal voltage V _t and the outside air temperature is as shown in FIG. 4 (B). That is, in the embodiment shown in FIG. 3 (A) described above, the reference voltage generating circuit shown in FIG. 4 (A) is installed in place of the reference voltage battery 11, and the terminal 23 of the reference voltage generating circuit is connected to the above-mentioned third embodiment. Comparator 1 in the illustrated embodiment of FIG.
If it is connected to the (-) terminal of 0, it is possible to control the number of revolutions of the starter to be separated from the engine in accordance with the outside air temperature.

(Effects of the Invention) As described above, according to the present invention, the rotation detecting means of the engine starter is configured by combining the magnet and the hall element that relatively rotate in response to the rotation of the engine starter. As a result, it is possible to obtain a small-sized and inexpensive rotation detecting means, and it is possible to accurately perform power supply prevention during inertial rotation and a desired automatic starter / release of the engine starter based on a detection signal from the rotation detecting means. An engine starter control device can be provided.

[Brief description of drawings]

1 (A) and 1 (B) are explanatory views of an embodiment of the rotation detecting means according to the present invention, and FIGS. 2 (A) to 2 (C) are explanations of another embodiment of the rotation detecting means according to the present invention. FIG. 3 (A) is a block diagram of an embodiment of the control circuit section according to the present invention, and FIGS. 3 (B) and 3 (C) are for explaining the operation of the embodiment shown in FIG. 3 (A). FIG. 4 (A) is a time chart diagram, FIG. 4 (A) is a block diagram of an embodiment of a reference voltage generating circuit in the control circuit section according to the present invention, and FIG. 4 (B) is a reference voltage in the embodiment shown in FIG. Characteristic diagram, Fig. 5 shows engine
The block diagram of the conventional example of a starter control device is shown. In the figure, 1 and 1'are plastic magnets, 2 are Hall elements, 3 is a starter casing, 4 is a rotor, 5 is a rotor shaft, 6 is a pinion gear, 7 is a reduction shaft, 7'is a reduction unit, 8 is a reduction gear, 9 is an F / V converter, 10 is a comparator, 11 is a reference voltage battery, 12 to 14 and 27.
To 29 are resistors, 15 and 16 are capacitors, 17
And 18 are differential shapers, 19 and 25 are diodes, 20 is a waveform shaping circuit, 21 is a flip-flop,
22 is an OR circuit, 23 is a terminal, 24 is a thermistor, 26
Represents a battery.

Claims (1)

[Claims] 1. A rotor arranged in a starter casing, a pinion gear provided on a rotor shaft of the rotor, and a pinion gear meshed with the pinion gear so as to be rotatable about a reduction shaft. The bowl-shaped body has an engine starter having an inner peripheral surface with a speed reducing portion having a speed reducing gear, and rotation detecting means for detecting the rotation of the engine starter, and a detection signal of the rotation detecting means. In the engine starter control device for controlling the engine starter, a magnet fixed to the outer surface of the bowl-shaped body is provided as the rotation detecting means, and the magnet is located inside the starter casing and faces the magnet. A hall element fixed to a stationary member is provided at a position, and the engine starter is controlled based on the output of the hall element. An engine starter control device characterized in that