JP2002070700A - Starter control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quietly and quickly start an engine so that a vehicle is runnable as soon as an accelerator is operated in an economic run system for stopping the engine during stopping. SOLUTION: A starter motor comprises a compound coil 6 connected in parallel to a direct coil 5 for generating a field magnetic flux. The compound coil 6 is controlled by an ECU 11 through a compound control element 10. The ECU 11 minimizes the torque fluctuation of an engine by the ON-OFF of the compound coil 6 according to the fluctuation of engine load to minimize the noise caused by the rotating fluctuation of the engine 1. Since the output rotating speed of a starter 2 is increased, when the engine load is minimized, to continuously press the ring gear of the engine 1 by a pinion, the collision sound between the pinion and the ring gear can be eliminated. Further, since the current carrying to the compound coil 6 is stopped in the end of the cracking of the engine 1 to quickly start up the engine 1 with unstable complete explosion, the time from starting to departure can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a starter for starting an engine.

[0002]

2. Description of the Related Art In recent years, an eco-run system in which an engine is stopped when a vehicle is stopped has been implemented for the purpose of improving fuel efficiency of a vehicle, reducing exhaust gas, and the like. This eco-run system monitors vehicle speed, accelerator opening, brake state, etc.
The system stops the engine when the vehicle stops, and when the brake is released and the accelerator is depressed, the starter is started to start the engine and start the vehicle.

[0003]

In the case of an eco-run system, an engine start time is required between the waiting for a traffic light and the start of the vehicle.
A report from the National Police Agency that traffic congestion is expected in urban areas with a large number of vehicles. For this reason, in an eco-run system that requires a long time from waiting for a traffic light to starting, there is a possibility that the eco-run system itself may be regulated by laws, regulations, or the like, and there is an urgent need to reduce the engine start time.

Further, in the case of the eco-run system, since the engine is frequently started, the noise generated at the time of starting is more worrisome for a general vehicle user than an existing vehicle (a vehicle other than the eco-run). It is necessary to reduce the noise at startup. Measures such as sound absorbing materials and sound insulating materials have a limit on noise reduction, and increasing the amount of sound absorbing materials increases the weight of the vehicle and contradicts the original purpose of improving fuel efficiency.
There is a need to reduce the sources of noise.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a starter control system capable of shortening an engine start time and reducing a start noise.

[0006]

[Means for Solving the Problems] [Means for Claims 1 and 2]
By adopting the means of claim 1 or claim 2,
When the engine is started, the control means controls the energized state of the compound winding coil according to the load fluctuation of the engine. Specifically, control is performed to energize the compound winding coil (or increase the energization amount) when the engine load increases, and to stop energizing (or decrease the energization amount) the compound winding coil when the engine load decreases. By energizing (or increasing the amount of current) the compound-wound coil when the engine load increases, the series-wound coil and compound-wound coil generate a magnetic field, the field flux increases, and the output torque of the starter increases. Conversely, when the energization of the compound winding coil is stopped (or the amount of energization is reduced) when the engine load decreases, the magnetic field is reduced to the magnetic field of only the series-wound coil, so that the field flux decreases and the output torque of the starter decreases.

As described above, by changing the output torque of the starter in accordance with the load fluctuation of the engine, the fluctuation of the torque of the engine can be reduced, and the fluctuation of the rotation of the engine (that is, the movement of the piston from the bottom dead center to the top dead center when the piston moves). Noise caused by rotation load fluctuation) can be reduced. That is, noise at the time of starting the engine by the starter can be suppressed.

On the other hand, conventionally, the field flux of the starter has been constant. Therefore, when the engine load is large, the pinion of the starter pushes the ring gear of the engine, but when the engine load becomes small, the rotation of the engine becomes faster than the starter, and the ring gear of the engine acts to push the pinion of the starter. I do. For this reason, an unpleasant collision sound in which the ring gear and the pinion repeatedly collide with the rotation fluctuation of the engine is generated.

According to the first aspect of the present invention, when the load on the engine is large, even if the output rotation speed of the starter is low because the multiple winding coil is energized (or the energized amount is increased), the starter can be started. Pinion pushes the ring gear of the engine. When the engine load is reduced, the power supply to the compound winding coil is stopped (or the power supply amount is reduced), so that the output rotation speed of the starter is increased, and the state in which the pinion of the starter pushes the ring gear of the engine is continuously maintained. For this reason, it is possible to eliminate the repeated collision noise between the pinion and the ring gear as in the related art, and it is possible to suppress noise when the engine is started by the starter.

Further, in the prior art, since a large current flows in the starter for a short time, it is necessary to use elements capable of withstanding the large current to control the current supplied to the starter. And it was difficult to realize. However, in the first aspect of the present invention, the multi-turn coil arranged in parallel with the series coil is provided so as to control the energization. Since the current flowing through the multi-turn coil is smaller than that of the series-wound coil, control can be performed at low cost. That is, according to the first aspect of the present invention, control of the starter current can be realized at low cost.

According to a third aspect of the present invention, the energization of the multi-turn coil is stopped until the engine speed rises to a predetermined speed after detecting the end of cranking of the engine by employing the means of the third aspect. By doing so, the starter drives the engine at a high speed from the start of the complete explosion of the engine to the completion of the complete explosion, thus shortening the start-up time (the time until the complete explosion is stabilized). Can be.

According to a fourth aspect of the present invention, the multi-turn coil is energized when the gradient of the current value of the series-wound coil rises and the multiple-turn coil is turned on when the gradient of the current value of the series-wound coil decreases. Control to stop energization of the coil may be performed.

[Means of claim 5] The means of claim 5 is adopted to measure the cycle of the change in the current value of the series-wound coil, and to control the energization of the multi-turn coil based on the measured cycle. May be.

According to a sixth aspect of the present invention, an electronic switching element is employed as the compound control element, employing the means of the sixth aspect.
Alternatively, a mechanical relay switch may be used.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described using two examples and modifications. [First Embodiment] FIG. 1 shows an energizing circuit diagram of a starter. A starter 2 for starting the engine 1 includes a starter motor that is turned on and off by a magnet switch 3. The starter motor includes an armature 4 on which an armature coil (not shown) is mounted, a series-wound coil 5, an armature 4, and a series coil connected to a commutator (not shown) of the armature 4 via a brush (not shown). A multiple winding coil 6 connected in parallel to the winding coil 5 is provided.

The coil 3a (comprising a pull-in coil and a holding coil) 3a of the magnet switch 3 is connected to the vehicle-mounted battery 8 via the key switch 7, and when the key switch 7 is operated to the starter position 7a, The coil 3a of the magnet switch 3 is energized to turn on the magnet switch 3, which is a normally-open movable contact, so that a large current flows through the armature 4 and the series-wound coil 5 and the multi-winding coil 6 can be energized.

The series-wound coil 5 has a large current (for example, 400 to 5).
00A), the multiple-turn coil 6 has a larger number of turns than the series-wound coil 5, and a relatively small current (for example, about 10 to 20A) flows. As described above, the current flowing through the multi-turn coil 6 is smaller than that of the series-wound coil 5, so that the power supply control can be performed at low cost. That is, control of the starter current can be realized at low cost.

A compound winding control element 10 for controlling the energization of the compound winding coil 6 is arranged on the circuit for energizing the compound winding coil 6. Compound control element 10 shown in the first embodiment
Adopts an electronic switching element (for example, MOS-FET) using a semiconductor. The compound control element 10 is controlled by a control means (hereinafter referred to as ECU) 11.
ON-OFF controlled.

The ECU 11 controls the compound winding control element 10 when the starter 2 is actuated, and energizes (turns on) the compound winding coil 6 when the engine load increases, and energizes the compound winding coil 6 when the engine load decreases. Is stopped (OFF). Specifically, the ECU 11 detects the gradient of the current value of the series-wound coil 5 as means for detecting a change in the engine load. When the gradient of the current value of the series-wound coil 5 rises, the ECU 11 energizes the compound-wound coil 6 and
Is performed to stop the energization of the compound winding coil 6 when the gradient of the current value decreases.

The ECU 11 is provided so that the rotation speed of the engine 1 is input from an engine control device (not shown) or the like. The ECU 11 determines the rotation speed of the engine 1 based on the rotation speed of the engine 1 or the current value of the series-wound coil 5. When the end of the ranking (a state in which the complete explosion of the engine 1 is not stable) is detected, control is performed to stop the energization of the compound winding coil 6 until the rotation speed of the engine 1 increases to a predetermined rotation. As a result, the starter 2 rotates at high speed immediately before the start of the engine 1 is completed, and the engine 1 can be started up quickly.

Next, the operation and features of this embodiment will be described. When the key switch 7 is operated to the starter position 7a to start the engine 1, the magnet switch 3 is turned on and the starter 2 is started. Then, since the starter 2 drives the engine 1 having a large stationary inertia, an excessive load is applied to the starter 2, and the current flowing through the starter 2 sharply increases as shown in FIG. When the engine 1 starts to be driven, the starter current sharply decreases due to the back electromotive force. Thereafter, the starter current increases or decreases in accordance with a change in load accompanying movement of the piston from the bottom dead center to the top dead center.

Here, the ECU 11 supplies power to the compound winding coil 6 when the gradient of the current value of the series-wound coil 5 rises (when the engine load rises), and when the gradient of the current value of the series-wound coil 5 decreases (when the engine load rises). When the load drops, the energization of the compound winding coil 6 is stopped. When the engine load increases, the compound winding coil 6 is energized, the field magnetic flux of the starter 2 increases, and the output torque of the starter 2 increases. Conversely, when the engine load falls,
The energization of the compound coil 6 is stopped, the field magnetic flux of the starter 2 decreases, and the output torque of the starter 2 decreases.

As described above, by changing the output torque of the starter 2 according to the load fluctuation of the engine 1, the torque fluctuation of the engine 1 can be reduced, and
(I.e., rotational load fluctuation from the bottom dead center to the top dead center of the piston) can be reduced. That is,
Noise when the engine is started by the starter 2 can be suppressed.

When the engine load is large, the pinion of the starter 2 pushes the ring gear of the engine 1 even if the output rotation speed of the starter 2 is low because the compound winding coil 6 is energized. When the load decreases, the starter 2
, And the state where the pinion of the starter 2 pushes the ring gear of the engine 1 is continuously maintained. For this reason, it is possible to eliminate a collision sound in which the pinion and the ring gear repeatedly collide.

When the complete explosion of the engine 1 is started by the cranking of the engine 1 by the starter 2, the ECU 1
1 detects the end of cranking of the engine 1 (a state in which the complete explosion of the engine 1 is not stable) from the rotation speed of the engine 1 or the current value of the series-wound coil 5, and the rotation speed of the engine 1 reaches a predetermined rotation speed. The energization of the compound winding coil 6 is stopped until it rises. Then, the starter 2 rotates at a high speed, and the engine 1 in which the complete explosion is not stable can be quickly started as shown in FIG. As a result, the time from when the complete explosion of the engine 1 is started until the complete explosion is stabilized can be shortened. That is, the time from when the starter 2 is started to when the engine 1 is started and the vehicle can be started can be reduced.

[Second Embodiment] FIG. 3 shows an energizing circuit diagram of a starter 2 in a second embodiment. Note that the same reference numerals as those in the first embodiment in the drawings denote the same functional objects. In the first embodiment, an example in which an electronic switching element is applied as the compound control element 10 for controlling the energization of the compound coil 6 has been described. In the second embodiment, the compound control element is used. 3, a mechanical relay switch is applied as shown in FIG.

The compound winding control element 10 shown in the second embodiment
The relay 10 uses a normally-closed movable contact, and is turned off when the coil 10a is energized by the ECU 11 to stop energizing the compound coil 6. According to this embodiment, the same effect as that of the first embodiment can be obtained.

[Modification] In the above embodiment, the control of turning on / off the energization of the compound coil 6 by the compound control element 10 has been described as an example.
May be provided to vary the amount of current. As a specific example of the compound winding control element 10 in that case, a resistor and a relay may be combined to provide a variable amount of current to the compound winding coil 6, or a mechanical device using a variable resistor may be used. It is also possible to use a variable means or an electric variable means (such as an IGBT) for varying the duty ratio of the current-carrying electronic element.

In the above embodiment, an example in which the starter 2 is started by operating the key switch 7 has been described. However, a switch capable of turning the magnet switch 3 on and off by the ECU 11 may be provided separately from the key switch 7. That is,
The present invention may be applied to an eco-run system. The circuit and the configuration of the starter 2 described in the above embodiment are merely examples for describing the embodiment, and can be appropriately changed.

[Brief description of the drawings]

FIG. 1 is an energization circuit diagram of a starter (first embodiment).

FIG. 2 is a graph showing a starter current value and an engine speed when a starter is started (first embodiment).

FIG. 3 is an energization circuit diagram of a starter (second embodiment).

[Explanation of symbols]

 Reference Signs List 1 engine 2 starter 4 armature 5 series-wound coil 6 compound-wound coil 10 compound-wound control element 11 ECU (control means)

Continued on the front page F term (reference) 3G093 BA00 BA22 BA32 CA01 CA05 DA01 DA12 DB20 DB21 EC02 FA11 5H571 AA03 BB04 BB10 CC04 DD04 HA04 HA09 HB04 LL01 LL22 LL41 LL50 5H607 AA00 AA04 BB01 BB04 CC01 FF02

Claims (6)

[Claims] An armature including an armature coil, a series-wound coil connected in series to the armature coil, a starter including a compound-wound coil connected in parallel to the armature coil and the series-wound coil, A starter control system comprising: a compound winding control element for controlling energization of the compound winding coil; and control means for controlling energization of the compound winding coil by controlling the compound winding control element according to a load change of an engine. . 2. The starter control system according to claim 1, wherein said control means energizes said compound winding coil when the engine load increases and stops energizing said compound winding coil when said engine load decreases. And starter control system. 3. The starter control system according to claim 1, wherein the control means detects the end of cranking of the engine from a rotation speed of the engine or a current value of the series-wound coil. A starter control system, wherein control is performed to stop energization of the compound winding coil until the rotation speed of the engine rises to a predetermined rotation. 4. The starter control system according to claim 1, wherein said control means detects a gradient of a current value of said series-wound coil as means for detecting a change in said engine load. There is provided a control that energizes the compound-wound coil when the gradient of the current value of the series-wound coil rises, and stops energization of the compound-wound coil when the gradient of the current value of the series-wound coil decreases. Starter control system. 5. The starter control system according to claim 1, wherein said control means measures a cycle of a change in a current value of said series-wound coil as means for detecting a change in said engine load. A starter control system for controlling the energization of the compound winding coil based on the measured cycle. 6. The starter control system according to claim 1, wherein said compound control element is an electronic switching element or a mechanical relay switch. .