JP5317867B2 - Belt transmission system - Google Patents

Description

  The present invention relates to a belt transmission system that transmits a rotational force by a belt when an engine is started and when an auxiliary machine is driven by the engine.

  As this type of prior art, a crank pulley attached to a crankshaft of an engine, pulleys attached to auxiliary machines arranged around the engine, and a starter / generator motor (hereinafter referred to as a motor generator). A belt transmission system is known in which a pulley connected to a belt is connected by a belt, and the engine is started by the motor generator via the belt, and after the engine is started, each auxiliary machine is driven by the engine via the belt. (For example, Patent Document 1).

  In the belt transmission system 100 described in Patent Document 1, as shown in FIG. 23, when the engine is started by the motor generator, the looseness generated in the belt 103 with respect to the engine pulley 101 and the motor generator pulley 102 is maximized. A tension adjusting device 104 that adjusts the belt tension is arranged in the span on the most loose side of the belt, and when the other accessories are driven by the engine, the belt 103 is connected between the pulley 101 of the engine and the pulley 105 of the tension adjusting device 104. Other auxiliary pulleys 106 are arranged in the span on the tension side.

Japanese Patent No. 3195287

  However, the belt transmission system 100 described in Patent Document 1 is effective when the engine is started. However, when the motor generator is used as a generator by the power of the engine after the engine is started, the tension adjusting device 104 is used for the belt tensioning. Since the tension adjusting device 104 is pressed and contracted by the belt 103 due to the positioning on the side, there is a problem that transmission efficiency is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a belt transmission system capable of suppressing a decrease in transmission efficiency even after the engine is started.

In order to achieve the above object, the invention described in claim 1
Motor generator pulley (for example, motor pulley 5 of the embodiment described later) of the motor generator (for example, motor generator 2 of the embodiment described later) for transmitting the starting power to the engine (for example, engine 1 of the embodiment described later) When,
An engine pulley (for example, a crank pulley 4 in an embodiment described later) that transmits the starting power of the motor generator to the engine and transmits the rotational power of the engine to the motor generator pulley;
An endless belt wound around the motor generator pulley and the engine pulley (for example, a belt 6 in an embodiment described later);
A belt transmission system (for example, a belt transmission system of an embodiment to be described later) including a belt tension adjustment device (for example, a belt tension adjustment device 7 of an embodiment to be described later) that applies tension to the belt in accordance with contraction and expansion. 10A, 10B)
The belt tension adjusting device is disposed in a span that becomes a tension side when the engine is driven, and a contraction suppressing device that suppresses contraction of the belt tension adjusting device when the motor generator is used as a generator. (e.g., shrinkage suppression device 12 of the embodiment described later) provided with,
The shrinkage suppression device operates according to a power generation load torque by the motor generator,
The shrinkage suppression device does not operate when the power generation load torque by the motor generator is lower than a predetermined load torque (for example, a threshold value of the embodiment described later, threshold value 1), and operates when it is higher than the predetermined load torque. Composed of
When the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the load torque is canceled for a predetermined time from the execution of the contraction suppression of the contraction suppression device, and the predetermined time After the elapse of time, the power generation by the motor generator is changed to a high load torque .

The invention according to claim 2
Motor generator pulley (for example, motor pulley 5 of the embodiment described later) of the motor generator (for example, motor generator 2 of the embodiment described later) for transmitting the starting power to the engine (for example, engine 1 of the embodiment described later) When,
An engine pulley (for example, a crank pulley 4 in an embodiment described later) that transmits the starting power of the motor generator to the engine and transmits the rotational power of the engine to the motor generator pulley;
An endless belt wound around the motor generator pulley and the engine pulley (for example, a belt 6 in an embodiment described later);
A belt transmission system (for example, a belt transmission system of an embodiment to be described later) including a belt tension adjustment device (for example, a belt tension adjustment device 7 of an embodiment to be described later) that applies tension to the belt in accordance with contraction and expansion. 10A, 10B)
The belt tension adjusting device is disposed in a span that becomes a tension side when the engine is driven, and a contraction suppressing device that suppresses contraction of the belt tension adjusting device when the motor generator is used as a generator. (For example, the shrinkage suppression device 12 of the embodiment described later)
The shrinkage suppression device operates according to a power generation load torque by the motor generator,
The shrinkage suppression device is configured not to operate when a power generation load torque by the motor generator is lower than a predetermined load torque, and to operate when higher than the predetermined load torque,
When the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the motor generator is power-run for a predetermined time from the execution of the contraction suppression of the contraction suppression device, The power generation by the motor generator is changed to a high load torque after the predetermined time has elapsed .

In addition to the configuration described in claim 1 or 2, the invention described in claim 3
An auxiliary pulley (for example, an auxiliary pulley 11 in an embodiment described later) that transmits power from the engine pulley transmitted through the belt to the auxiliary device;
The belt tension adjusting device is disposed between the motor generator pulley and the auxiliary pulley .

Moreover, in addition to the structure of any one of Claims 1-3, invention of Claim 4 is provided.
The predetermined load torque is provided with hysteresis .

Moreover, in addition to the structure of any one of Claims 1-4 , invention of Claim 5 is provided,
The motor generator has a coil temperature detector that detects the coil temperature of the motor generator;
The predetermined time is corrected according to the coil temperature .

Moreover, in addition to the structure of any one of Claims 1-5 , the invention of Claim 6 is
The power generation of the motor generator is performed after a predetermined time has elapsed since the contraction suppression of the contraction suppression device .

According to the first to third aspects of the present invention, the belt tension adjusting device is arranged in a span that becomes a tension side when the engine is driven, that is, a span that becomes a loose side when the engine is started by the motor generator. Therefore, the belt tension adjusting device can be set to a low tension, and the load applied to the bearings and belts of the respective shafts can be reduced.
In addition, when the motor generator is used as a generator, the side on which the belt tension adjusting device is arranged becomes the tension side, but since the motor is provided with a contraction suppressing device that suppresses the contraction of the belt tension adjusting device, the motor generator generates power. When the belt is stretched, it is possible to prevent the belt tension adjusting device from being compressed and the transmission efficiency from being lowered.

Further, according to the first and second aspects of the invention, the operation time of the shrinkage suppression device can be shortened, and power saving can be achieved.

Furthermore, according to the first aspect of the present invention, when the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the contraction suppression device performs the contraction for a predetermined time. Since the load torque is canceled, it is possible to restore the belt tension by restoring the contraction of the belt tension adjusting device due to the increase in the tension due to the power generation load. Since the power generation by the motor generator is changed to a high load torque after a predetermined time has elapsed, the power generation load is applied after the belt tension is increased, and the power transmission is more reliably performed.

According to the second aspect of the present invention, when the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the contraction suppression device performs the contraction suppression for a predetermined time. Since the motor generator is driven by power running, the contraction of the belt tension adjusting device due to the decrease in tension caused by the power generation load is restored, and further, the belt tension adjusting device is actively expanded by power running driving, and the belt tension can be increased. . Since the power generation by the motor generator is changed to a high load torque after a predetermined time has elapsed, the power generation load is applied after the belt tension is increased, and the power transmission is more reliably performed.

Furthermore, according to the invention described in claim 4 , since the hysteresis is provided for the predetermined load torque, the operation of the shrinkage suppression device is repeatedly performed in accordance with a change in the vehicle body electrical load when the power generation request is near the threshold value. Can be prevented. Thereby, the load applied to the bearings and belts of the respective shafts can be reduced, and the deterioration of drivability can be minimized.

Furthermore, according to the fifth aspect of the present invention, the motor generator has a coil temperature detector that detects the coil temperature of the motor generator, and the predetermined time is corrected according to the coil temperature. It is possible to minimize the influence of the response delay. As a result, regeneration can be eliminated, and the influence on drivability can be suppressed by minimizing idle time.
According to the sixth aspect of the present invention, the power generation of the motor generator is performed after a predetermined time has elapsed from the execution of the contraction suppression of the contraction suppression device, so that the contraction suppression device changes from the valve open state to the valve closed state. It is possible to prevent power generation from starting during the transition, and it is possible to improve power generation efficiency by generating power in a state where an appropriate tension is applied to the belt.

It is a schematic diagram which shows an example of the belt transmission system of this invention. It is a schematic diagram which shows the other example of the belt transmission system of this invention. It is sectional drawing of the belt tension adjusting apparatus explaining the action | operation of a belt tension adjusting apparatus. It is a graph explaining the level division of power generation load torque. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining a hysteresis. It is a graph explaining annealing control. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph explaining an example of control of a belt tension adjustment device and a motor generator. It is a graph which shows the relationship between coil temperature, delay time, zero power generation time, and power running time. It is a graph which shows the relationship between coil temperature, delay time, zero power generation time, and power running time. In the control in FIG. 5, (a) is a graph showing a case where the coil temperature is high, and (b) is a graph showing a case where the coil temperature is low. In the control in FIG. 6, (a) is a graph showing a case where the coil temperature is high, and (b) is a graph showing a case where the coil temperature is low. In the control in FIG. 7, (a) is a graph showing a case where the coil temperature is high, and (b) is a graph showing a case where the coil temperature is low. In the control in FIG. 8, (a) is a graph showing a case where the coil temperature is high, and (b) is a graph showing a case where the coil temperature is low. It is a flowchart which shows the control flow of a belt tension adjusting device and a motor generator. It is a flowchart of target electric power generation torque calculation. It is a schematic diagram which shows an example of the belt transmission system of patent document 1. FIG.

Hereinafter, an embodiment of a belt transmission system of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of a belt transmission system of the present invention.
A belt transmission system 10A of the present embodiment is used in a power transmission device 3A including an engine 1 and a motor generator 2 that transmits starting power to the engine 1, and a crank pulley 4 and a motor attached to a crankshaft of the engine 1 An endless belt 6 is wound around a motor pulley 5 attached to the generator 2, and a tensioner pulley 8 of a belt tension adjusting device 7 (referred to as a tensioner in the figure) is provided between the crank pulley 4 and the motor pulley 5. ing. The belt tension adjusting device 7 is disposed on a span that becomes a loose side when the motor generator 2 starts the engine 1, in other words, a span that becomes a tight side when the motor generator 2 is driven to generate power. ing.

FIG. 2 is a schematic view showing another example of the belt transmission system of the present invention.
The belt transmission system 10B of the present embodiment includes an engine 1, a motor generator 2 that transmits starting power to the engine 1, and at least one auxiliary machine 9 (for example, an oil pump, an air conditioner compressor, and the like). An endless belt 6 is wound around a crank pulley 4 attached to a crankshaft of the engine 1, a motor pulley 5 attached to a motor generator 2, and an auxiliary pulley 11 attached to an auxiliary machine 9 used in the power transmission device 3B. A tensioner pulley 8 of the belt tension adjusting device 7 is provided between the motor pulley 5 and the auxiliary pulley 11. The belt tension adjusting device 7 is disposed in a span that becomes a loose side when the motor generator 2 starts the engine 1, in other words, a span that becomes a tight side when the motor generator 2 is driven to generate power. ing. The power transmission devices 3A and 3B in which the belt transmission systems 10A and 10B are used include an electronic control unit, which controls the operation of the belt tension adjusting device 7 and also controls the motor generator 2 via a motor controller and an inverter. The operation is controlled.

Next, the belt tension adjusting device 7 of the belt transmission systems 10A and 10B will be described.
As shown in FIG. 3, the main body 70 of the belt tension adjusting device 7 is formed by connecting a first housing 71 and a second housing 72 arranged in opposition to each other in series by a telescopic bellows 73. A piston 74 formed integrally or separately at the center of the second housing 72 is slidably fitted into a cylinder 75 formed integrally or separately at the center of the second housing 72. A first communication passage P1 penetrating in the axial direction is formed in the piston 74, and a throttle 74a is formed at the lower end of the first communication passage P1.

  The first housing 71 and the second housing 72 are urged in a direction away from each other by a spring 76 housed therein, that is, a direction in which the main body 70 extends, and the tensioner pulley 8 is moved by the extension of the main body 70. To give tension to

  A first liquid chamber 77 defined between the piston 74 and the cylinder 75 and a second liquid chamber 78 defined between the first housing 71, the second housing 72, and the bellows 73 penetrate the piston 74 in the axial direction. The first communication path P1 is connected to the second housing 72 via a second communication path P2 formed in the second housing 72, and the liquid is sealed in the entire first liquid chamber 77 and the lower part of the second liquid chamber 78. When the main body 70 contracts, the volume of the first liquid chamber 77 decreases, and when the main body 70 extends, the volume of the first liquid chamber 77 increases.

  A check valve 79 is provided at a portion where the first liquid chamber 77 communicates with the second communication path P2. The check valve 79 includes a valve seat 80 fixed to the lower end of the cylinder 75 and a valve body 81 made of a ball that can be seated on the valve seat 80 from above. It functions to block the movement of the liquid to the liquid chamber 78 and allow the movement of the liquid from the second liquid chamber 78 to the first liquid chamber 77.

  As is apparent from FIG. 3, the actuator 9 is provided on the side surface of the first housing 71, and the control valve 84 provided inside the first housing 71 is controlled to open and close by the actuator 9. The actuator 9 and the control valve 84 constitute a shrinkage suppression device 12. The actuator 9 includes a solenoid 93 housed in an actuator housing 92, an arm 94 that is actuated by the solenoid 93, and a spring 95 that urges the arm 94 to the right. A valve body 85 fixed to the amateur 94 faces the valve seat 86 so as to be seated. The valve body 85 and the valve seat 86 constitute a control valve 84.

Next, the operation of the belt tension adjusting device 7 of the present invention having the above configuration will be described.
First, when the vehicle is stopped, the solenoid 93 of the actuator 9 of the contraction suppressing device 12 is in a demagnetized state, and the armature 94 is moved to the right by the elastic force of the spring 95 so that the valve body 85 is separated from the valve seat 86. The control valve 84 is open. From this state, when the motor generator 2 is driven to start the engine 1 and the motor pulley 5 is rotated so that the crank pulley 4 rotates in the direction indicated by the arrow in the drawing (see FIGS. 1 and 2), the belt tension adjusting device. Although the tension of the belt 6 rapidly decreases at the position 7, the check valve 79 allows the liquid to move from the second liquid chamber 78 to the first liquid chamber 77, so the first liquid chamber 77 via the second communication path P <b> 2. And the belt tension adjusting device 7 expands. As a result, tension is applied to the belt 6 and the engine 1 can be started.

  Even during normal operation of the engine 1, the solenoid 93 of the actuator 9 of the contraction suppressing device 12 is in a demagnetized state, and the control valve 84 is in an open state. Accordingly, the belt tension adjusting device 7 allows the movement of the liquid from the second liquid chamber 78 to the first liquid chamber 77 when the tension of the belt 6 decreases according to the acceleration / deceleration of the vehicle. The volume of the first liquid chamber 77 is increased by the urging force, and the liquid moves from the second liquid chamber 78 to the first liquid chamber 77 via the second communication path P2. At this time, the belt tension adjusting device 7 is extended and tension is applied to the belt 6. On the other hand, when the tension of the belt 6 increases, the check valve 79 blocks the movement of the liquid from the first liquid chamber 77 to the second liquid chamber 78, but the control valve 84 moves from the second liquid chamber 78 to the first liquid chamber 77. Therefore, the volume of the first liquid chamber 77 is reduced against the biasing force of the spring 76. At this time, the liquid in the first liquid chamber 77 flows into the second liquid chamber 78 via the throttle 74a of the piston 74, the second communication path P2, and the opened control valve 84, and the increase in the tension of the belt 6 is suppressed. The At that time, a damping force is generated by the liquid passing through the throttle 74 a of the piston 74.

  As described above, when the tension of the belt 6 increases or decreases, the main body 70 of the belt tension adjusting device 7 expands and contracts so as to compensate for it, thereby enabling stable power transmission by maintaining the tension of the belt 6 substantially constant. can do.

  By the way, when the main body 70 of the belt tension adjusting device 7 expands and contracts and exhibits the tension adjusting function of the belt 6, when the motor generator 2 is driven as a generator, the tension of the belt 6 is increased at the position of the belt tension adjusting device 7. Increase rapidly. At this time, the main body 70 is easily contracted only by the flow resistance of the liquid generated in the throttle 74 a, and there is a possibility that the belt 6 may slip due to a large load accompanying the power generation of the motor generator 2.

  In this embodiment, the control valve 84 is closed by exciting the solenoid 93 of the actuator 9 of the contraction suppressing device 12 in accordance with the load torque of the motor generator 2. As a result, even if the tension of the belt 6 temporarily increases as the motor generator 2 generates power, the belt tension adjusting device 7 is not compressed and contracted by temporarily suppressing the main body 70 from contracting, so that the belt 6 Thus, slippage can be prevented in advance and power transmission from the engine 1 to the motor generator 2 can be stabilized.

  At this time, as shown in FIG. 4, when the power generation load torque is divided into the high level side and the low level side by providing a threshold value and the power generation load torque of the motor generator 2 is on the low level side, the control valve 84 is opened. The control valve 84 may be closed by exciting the solenoid 93 of the actuator 9 at the same time that the state is maintained and the power generation load torque of the motor generator 2 exceeds the threshold value and shifts from the low level side to the high level side. When the power generation load torque of the motor generator 2 is low, the tension of the belt 6 is relatively small and the occurrence of slip is relatively small. Therefore, the belt tension is maintained without the main body 70 being compressed when the motor generator 2 generates power. As a result, the driving force can be reliably transmitted during power generation, and power saving of the solenoid 93 can be achieved.

5 to 9 and 12 to 14 show a control method for controlling the contraction suppression of the main body 70 and the power generation of the motor generator 2 according to the power generation request.
FIG. 5 shows a case where a predetermined time delay is provided from the power generation request from the electronic control unit, and power generation of the motor generator 2 is started after a predetermined time has elapsed from the power generation request from the electronic control unit. At this time, the shrinkage suppression device 12 blocks the flow path (shrinkage suppression is performed) prior to the start of power generation simultaneously with the power generation request. As a result, the solenoid 93 of the actuator 9 is excited to prevent power generation from starting while the control valve 84 shifts from the open state to the closed state. Power generation efficiency can be improved by performing power generation in a state where an appropriate tension is applied.

  FIG. 6 shows a predetermined time from the power generation request when there is a power generation request across the threshold value from the low level side to the high level side from the electronic control unit during power generation on the low level side where the power generation load torque is lower than the threshold value. A case where the power generation of the motor generator 2 is shifted to the high level side after the elapse is shown. At this time, the shrinkage suppression device 12 blocks the flow path (shrinkage suppression is performed) simultaneously with the power generation request. As a result, the main body 70 is prevented from being compressed and power generation is performed in a state where an appropriate tension is applied to the belt 6, thereby improving the power generation efficiency and reducing the power consumption of the solenoid 93.

  FIG. 7 shows a predetermined time from the power generation request when there is a power generation request across the threshold value from the low level side to the high level side from the electronic control unit during power generation on the low level side where the power generation load torque is lower than the threshold value. Shows a case where the power generation load torque is canceled (zero power generation) and the power generation of the motor generator 2 is shifted to the high level side after a predetermined time has elapsed. At this time, the shrinkage suppression device 12 blocks the flow path (shrinkage suppression is performed) simultaneously with the power generation request. By canceling the power generation load torque once, the tension of the belt 6 is reduced at the position of the belt tension adjusting device 7, and the main body 70 is thereby extended. The expansion of the main body 70 is further maintained by previously closing the control valve 84, and the power generation efficiency can be improved by the motor generator 2 generating power in this state.

  FIG. 8 shows a predetermined time from the power generation request when there is a power generation request across the threshold value from the low level side to the high level side from the electronic control unit during power generation at the low level side where the power generation load torque is lower than the threshold value. Shows a case where the motor generator 2 is driven by power running and the power generation of the motor generator 2 is shifted to the high level side after a lapse of a predetermined time. At this time, the shrinkage suppression device 12 blocks the flow path (shrinkage suppression is performed) simultaneously with the power generation request. By driving the motor generator 2 once, the tension of the belt 6 is further reduced at the position of the belt tension adjusting device 7, whereby the main body 70 extends. The expansion of the main body 70 is further maintained by previously closing the control valve 84, and the power generation efficiency can be improved by the motor generator 2 generating power in this state.

FIG. 9 shows a case where the power generation of the motor generator 2 is started after a lapse of a predetermined time when a power generation request straddling the threshold value 1 from zero to the high level side, and the power generation load torque is made to follow the power generation request thereafter. .
Here, in FIGS. 9 and 12 to 14, the threshold value 1 is a threshold value when the power generation load torque described in FIG. 4 shifts from the low level side to the high level side, and the threshold value 2 is high. This is a threshold value for shifting from the level side to the low level side. Hysteresis is provided for threshold value 1 and threshold value 2. And the shrinkage | contraction suppression apparatus 12 interrupts | blocks a flow path in order to suppress shrinkage | contraction of the main body 10 at the same time that the electric power generation request crosses the threshold value 1 from the low level side to the high level side, and the electric power generation request 2 is set to the high level. The flow path is opened to allow contraction of the main body 10 at the same time from the side to the low level side.

  Here, the significance of providing hysteresis will be described with reference to FIG. 10. After the power generation request crosses the threshold value 1 from the low level side to the high level side, the threshold value 2 crosses from the high level side to the low level side. If the threshold value 1 is straddled from the high level side to the low level side, but the threshold value 1 is straddled again from the low level side to the high level side without straddling the threshold value 2, if there is no hysteresis, the shrinkage suppression device 12 performs the blocking / opening 2 Will be repeated. However, by providing a hysteresis between the threshold value 1 and the threshold value 2, the contraction suppression device 12 continues to suppress contraction until the power generation request crosses the threshold value 1 and crosses the threshold value 2. Accordingly, it is possible to prevent the shrinkage suppression device 12 from being repeatedly shut off and opened due to a change in the vehicle body electrical load when the power generation request is near the threshold. Thereby, the load applied to the bearings and the belt 6 of each shaft can be reduced, and the deterioration of drivability can be suppressed to the minimum.

  In FIG. 9, when the power generation of the motor generator 2 is increased to the power generation request after a predetermined time delay from the state where the power generation load torque is not applied, the power generation command is subjected to smoothing control to issue the actual power generation command. ing.

FIG. 11 is a graph for explaining the annealing control.
As shown in FIG. 11, when the power generation command changes in a step shape, drivability deteriorates if control is performed so as to immediately follow this. For this reason, when raising the power generation load torque of the motor generator 2 to the power generation request and reducing it to the power generation request, smoothing control is performed so as to slowly follow the power generation request, so that an unpleasant inertial force is applied to the occupant. It can be suppressed and drivability can be improved.

  FIG. 12 shows that when the power generation request crosses the threshold 1 from zero to the high level side, the power generation load torque of the motor generator 2 is made to follow the power generation request up to the threshold 1, and the power generation load torque is maintained for a predetermined time at the threshold 1. The case where the power generation of the motor generator 2 is shifted to the high level side after a predetermined time has elapsed and the power generation load torque is made to follow the power generation request thereafter is shown. Also in this case, by maintaining the power generation load torque for a predetermined time at the threshold value 1, the solenoid 93 of the actuator 9 is excited to generate power on the high level side while the control valve 84 shifts from the open state to the closed state. Can be prevented, and the power generation efficiency can be improved by preventing the contraction of the main body 70 and generating power on the high level side in a state where an appropriate tension is applied to the belt 6. Note that the above-described smoothing control is performed at the time of shifting to the high level side.

  FIG. 13 shows that when the power generation request crosses the threshold value 1 from zero to the high level, the power generation load torque of the motor generator 2 follows the power generation request until the threshold value 1, and after reaching the threshold value 1, the power generation load torque is set for a predetermined time. In this example, canceling (zero power generation) is performed, the power generation of the motor generator 2 is shifted to a high level after a lapse of a predetermined time, and the power generation load torque is made to follow the power generation request thereafter. Also in this case, as described with reference to FIG. 7, after reaching the threshold value 1, a larger belt tension is applied by once canceling the power generation load torque. In this state, the power generation efficiency can be improved by closing the control valve 84 and generating power with the motor generator 2. Note that the above smoothing control is performed when the generated load torque is canceled once after reaching the threshold 1 and when the generated load torque is shifted to a higher level after cancellation.

  FIG. 14 shows that when the power generation request crosses the threshold 1 from zero to the high level side, the power generation load torque of the motor generator 2 follows the power generation request until the threshold 1, and after reaching the threshold 1, the motor generator 2 is driven by power running. In this case, the power generation of the motor generator 2 is shifted to a high level after a predetermined time has elapsed, and the power generation load torque is made to follow the power generation request thereafter. Also in this case, as described with reference to FIG. 8, after the threshold value 1 is reached, the motor generator 2 is driven by powering to apply a larger belt tension. In this state, the power generation efficiency can be further improved by closing the control valve 84 and generating power with the motor generator 2. Note that the above smoothing control is performed when the motor generator 2 is driven by power running after reaching the threshold 1 and when the generated load torque is shifted to a higher level after power running.

  Here, the time delay, the zero power generation time, and the power running time in FIGS. 5 to 9 and 12 to 14 correspond to detection values from a coil temperature detection unit (not shown) that detects the coil temperature of the motor generator 2. It is preferable to correct it. For example, as shown in FIG. 15, a predetermined threshold value is provided for the coil temperature, and if the temperature is lower than the threshold value, these predetermined time delays, zero power generation time, and power running time are allotted. A predetermined time may be assigned, or a map may be prepared in advance as shown in FIG. 16, and these time delay, zero power generation time, and power running time may be set according to the detected value.

  FIGS. 17A and 17B are obtained by correcting the time delay in the case of FIG. 5 according to the coil temperature. If the coil temperature is high, the time delay is shortened as shown in FIG. If the coil temperature is low, the time delay is set long as shown in FIG. Similarly, FIGS. 18A and 18B are obtained by correcting the time delay in the case of FIG. 6 according to the coil temperature, and FIGS. 19A and 19B are the zero power generation time in the case of FIG. Are corrected according to the coil temperature, and FIGS. 20A and 20B are obtained by correcting the power running time in the case of FIG. 8 according to the coil temperature. Thus, regeneration can be eliminated by shifting the power generation timing according to the coil temperature, and drivability can be suppressed by minimizing the idle time.

  Next, the power generation control flow in FIGS. 9 and 12 to 14 of the belt tension adjusting device 7 of the present invention having the above-described configuration will be described with reference to FIGS. 21 and 22. 21 and 22, the time correction according to the coil temperature described in FIGS. 15 and 16 is taken into account.

  First, in step S101 shown in FIG. 21, the flow path blocking state of the shrinkage suppression device 12 is confirmed. If the flow path is not blocked as a result of step S101, that is, if the control valve 84 is in the open state, it is detected whether or not the command power generation torque is larger than the threshold value 1 in step S102. As a result, if the commanded power generation torque is equal to or less than the threshold value 1, the blockage of the shrinkage suppression device 12 is continuously prohibited and the control valve 84 is kept open (step S103). On the other hand, if the flow path is shut off as a result of step S101, that is, if the control valve 84 is closed, it is detected whether or not the indicated power generation torque is smaller than the threshold value 2 (step S104). If it is smaller than 2, the flow path blocking of the shrinkage suppression device 12 is prohibited and the control valve 84 is opened (step S103). On the other hand, when the command power generation torque is equal to or greater than the threshold value 2, the flow path block of the shrinkage suppression device 12 is continued (step S105), and the target power generation torque is calculated (step S106). Even when the command power generation torque is larger than the threshold value 1 in step S102, the flow path of the shrinkage suppression device 12 is shut off (step S107), and the target power generation torque is calculated (step S108). In step S103, if the flow path blocking of the shrinkage suppression device 12 is prohibited and the control valve 84 is opened, or the flow blocking of the shrinkage suppression device 12 is continuously prohibited and the control valve 84 is kept open, The power generation torque is set to the power generation instruction torque (step S109).

  Subsequently, in the calculation of the target power generation torque in step S106 and step S108, as shown in FIG. 22, first, a timer set value for determining the time delay, the zero power generation time, and the power running time is searched based on the coil temperature (step S201). Subsequently, the timer is counted based on the timer set value (step S202), and it is detected whether a predetermined time has elapsed (step S203). If the predetermined time has elapsed in step S203, the power generation instruction torque is set to the target power generation torque (step S204). If the predetermined time has not elapsed in step S203, it is detected whether or not there is only a time delay (step S205). If only the time delay is detected, the immediately preceding power generation torque is set as the target power generation torque (step S206). If so (step S207), zero torque is set as the target power generation torque (step S208), and if it is the power running mode, the drive torque is set as the target power generation torque (step S209).

  Returning to FIG. 21, after calculating the target power generation torque in steps 106 and 108, or after setting the power generation instruction torque to the target power generation torque in step S <b> 109, the target power generation torque is subjected to a smoothing process to generate a power generation torque command value. (Actual power generation command) is set (step S110).

  As described above, according to the belt transmission systems 10 </ b> A and 10 </ b> B of the present embodiment, the belt tension adjusting device 7 becomes a tension side when the engine 1 is driven, that is, when the engine is started by the motor generator 2. Therefore, the belt tension adjusting device 7 can be set to a low tension, and the load applied to the bearings and the belt 6 of each shaft can be reduced.

  Further, when the motor generator 2 is used as a generator, the side on which the belt tension adjusting device 7 is disposed becomes the tension side, but the motor generator 2 includes the contraction suppressing device 12 that suppresses the contraction of the belt tension adjusting device 7. When the belt 2 generates power when the belt 2 generates power, it is possible to suppress the belt tension adjusting device 7 from being compressed and the transmission efficiency from being lowered.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

1 Engine 2 Motor generator (motor generator)
4 Crank pulley (engine pulley)
5 Motor pulley (motor generator pulley)
6 Belt 7 Belt tension adjusting device 10A, 10B Belt transmission system 11 Auxiliary pulley 12 Shrinkage suppression device

Claims (6)

A motor-generator pulley of a motor-generator that transmits starting power to the engine;
An engine pulley that transmits the starting power of the motor generator to the engine and transmits the rotational power of the engine to the motor generator pulley;
An endless belt wound around the motor generator pulley and the engine pulley;
A belt transmission system comprising: a belt tension adjusting device that applies tension to the belt as it contracts and expands;
The belt tension adjusting device is disposed in a span that becomes a tension side when the engine is driven, and a contraction suppressing device that suppresses contraction of the belt tension adjusting device when the motor generator is used as a generator. equipped with a,
The shrinkage suppression device operates according to a power generation load torque by the motor generator,
The shrinkage suppression device is configured not to operate when a power generation load torque by the motor generator is lower than a predetermined load torque, and to operate when higher than the predetermined load torque,
When the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the load torque is canceled for a predetermined time from the execution of the contraction suppression of the contraction suppression device, and the predetermined time A belt transmission system that changes power generation by the motor generator to a high load torque after elapse of time .   A motor-generator pulley of a motor-generator that transmits starting power to the engine;
  An engine pulley that transmits the starting power of the motor generator to the engine and transmits the rotational power of the engine to the motor generator pulley;
  An endless belt wound around the motor generator pulley and the engine pulley;
  A belt transmission system comprising: a belt tension adjusting device that applies tension to the belt as it contracts and expands;
  The belt tension adjusting device is disposed in a span that becomes a tension side when the engine is driven, and a contraction suppressing device that suppresses contraction of the belt tension adjusting device when the motor generator is used as a generator. With
  The shrinkage suppression device operates according to a power generation load torque by the motor generator,
  The shrinkage suppression device is configured not to operate when a power generation load torque by the motor generator is lower than a predetermined load torque, and to operate when higher than the predetermined load torque,
  When the power generation request to the motor generator is changed from a load torque lower than the predetermined load torque to a high load torque, the motor generator is power-run for a predetermined time from the execution of the contraction suppression of the contraction suppression device, A belt transmission system, wherein power generation by the motor generator is changed to a high load torque after the predetermined time has elapsed.   An auxiliary pulley that transmits power from the engine pulley transmitted through the belt to the auxiliary device;
  The belt transmission system according to claim 1 or 2, wherein the belt tension adjusting device is arranged between the motor generator pulley and the auxiliary pulley.   The belt transmission system according to claim 1, wherein a hysteresis is provided in the predetermined load torque.   The motor generator has a coil temperature detector that detects the coil temperature of the motor generator;
  The belt transmission system according to claim 1, wherein the predetermined time is corrected according to the coil temperature.   6. The belt transmission system according to claim 1, wherein power generation by the motor generator is performed after a predetermined time has elapsed since the contraction suppression of the contraction suppression device.

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