JP2006207645A - Accessories drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive mechanism for accessories including a vacuum pump, having improved reliability by reducing influences on improved fuel consumption or reduced exhaust gas. <P>SOLUTION: The drive mechanism for the accessories comprises a one-way clutch 14 for transmitting the drive of either an engine 10 or a motor 20, which gives a higher revolving/rotating speed to the vacuum pump 18, to the vacuum pump 18. The one-way clutch 14 consists of a first one-way clutch 14a arranged between the vacuum pump 18 and the engine 10 and a second one-way clutch 14b arranged between the vacuum pump 18 and the motor 20. Thus, the drive of either the engine 10 or the motor 20 which gives a higher revolving/rotating speed to the vacuum pump 18 is transmitted to the vacuum pump 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a driving technique for driving auxiliary machines such as a vacuum pump, and more particularly to a driving technique for auxiliary machines for driving auxiliary machines by an internal combustion engine or an electric motor.

  Various auxiliary machines such as a vacuum pump and a compressor for an air conditioner are provided in the vehicle. These are generally driven by being connected to an output shaft such as a camshaft or crankshaft of an internal combustion engine directly or through a belt-and-pulley mechanism or by being connected to an electric motor such as a motor. As for the driving of these auxiliary machines, various techniques have been proposed for connection to an internal combustion engine and durability of auxiliary machines.

For example, Patent Document 1 proposes a drive control device for auxiliary machines that selects a drive source for auxiliary machines from an internal combustion engine and an electric motor in accordance with the required drive amount of the auxiliary machines. Further, in Patent Document 2, for example, a negative clutch mechanism that connects the drive shaft and the vacuum pump unit when the negative pressure in the negative pressure consumption circuit drops below a predetermined value is disposed between the drive shaft and the vacuum pump. A pressure generator has been proposed. For example, Patent Document 3 proposes a vacuum pump having a small hole for discharging lubricating oil when the pump is stopped in a vane type pump using engine oil as lubricating oil. For example, Patent Document 4 proposes an auxiliary machine support device for an internal combustion engine that includes a control unit that variably adjusts the support rigidity of a bracket for mounting an auxiliary machine on the engine according to the engine speed. In Non-Patent Document 1, a clutch is coaxially fitted to a shaft that is a rotation shaft of a rotor of a vane type vacuum pump, and the clutch is released when a vacuum level of a brake booster or the like reaches a predetermined value. A vacuum pump has been proposed.
JP 2003-35173 A JP-A-8-72700 Utility Model Registration No. 2562414 Japanese Utility Model Publication No. 4-17131 Junichi Tagami, “Vacuum Pump”, Toyota Technical Publications 7470 p. 365 and p. 366, Japan, Toyota Motor Corporation, January 30, 1998

  When driving an auxiliary machine using an internal combustion engine as a drive source, for example, the auxiliary machine may be driven at a higher speed than that required for driving the auxiliary machine. May affect gas reduction. Further, when the electric motor is used as a drive source, there is a problem that maintenance is required due to wear of the motor brush.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a driving device for auxiliary equipment such as a vacuum pump, which has reduced the influence on fuel efficiency improvement and exhaust gas reduction, and has improved reliability. It is in.

  In order to solve the above-described problems, an auxiliary device driving apparatus according to an aspect of the present invention is an auxiliary device driving apparatus that drives an auxiliary device by utilizing the rotation of at least one of an internal combustion engine and an electric motor. In the above, drive transmission means for transmitting, to the auxiliary machinery, the drive having the higher rotational speed given to the auxiliary machinery among the internal combustion engine and the electric motor is provided. According to this aspect, it is possible to switch the driving source of the auxiliary equipment between the internal combustion engine and the electric motor with a simple configuration.

  The drive transmission means includes a first one-way clutch disposed between the auxiliary machinery and the internal combustion engine, and a second one-way clutch disposed between the auxiliary machinery and the electric motor. The higher drive of the rotation speed given to the motor and the rotation speed given to the auxiliary equipment by the electric motor may be transmitted to the auxiliary equipment. According to this aspect, with a simple configuration, it is possible to transmit the drive having the higher rotational speed of the internal combustion engine and the electric motor to the auxiliary machinery.

  The auxiliary machinery may include a vacuum pump that adjusts the negative pressure of the brake booster. When the internal combustion engine is driving the vacuum pump and the negative pressure of the brake booster is below a predetermined value, the electric motor gives the vacuum pump a higher rotational speed than the rotational speed that the internal combustion engine gives to the vacuum pump. Thus, the vacuum pump may be driven at a higher rotational speed than the rotational speed that the internal combustion engine gives to the vacuum pump. According to this aspect, the negative pressure of the brake booster can be adjusted effectively.

  Another aspect of the present invention is also a drive device for auxiliary machinery. This device is a driving device for auxiliary machinery that drives the auxiliary machinery by utilizing the rotation of at least one of the internal combustion engine and the electric motor. The auxiliary machinery is supplied with oil when the internal combustion engine is operated. The oil is discharged when the electric motor drives the auxiliary machinery. When the internal combustion engine is stopped from the state where the internal combustion engine is operating, the electric motor drives the auxiliary machinery for a predetermined time. According to this aspect, the reliability of auxiliary machinery can be improved.

  Yet another embodiment of the present invention is also a drive device for auxiliary machinery. This device is a driving device for auxiliary machinery that drives the auxiliary machinery by utilizing the rotation of at least one of the internal combustion engine and the electric motor. The auxiliary machinery is supplied with oil when the internal combustion engine is operated. The oil is discharged when the electric motor drives the auxiliary machines, and the internal combustion engine is operated when the electric motor drives the auxiliary machines for a predetermined time or more with the internal combustion engine stopped. According to this aspect, the reliability of auxiliary machinery can be improved.

  Yet another embodiment of the present invention is also a drive device for auxiliary machinery. This apparatus is a drive device for auxiliary equipment that drives auxiliary equipment by utilizing the rotation of at least one of the internal combustion engine and the electric motor, and the internal combustion engine drives the auxiliary equipment in a state where the internal combustion engine drives the auxiliary equipment. When the motor rotates at a rotational speed within a predetermined range for a predetermined time or longer, the electric motor is driven so that the accessories are driven at a rotational speed other than the rotational speed within the predetermined range. According to this aspect, it is possible to suppress inconveniences such as noise caused by the auxiliary machines rotating at a rotation speed within a predetermined range.

  Yet another embodiment of the present invention is also a drive device for auxiliary machinery. This device is a drive device for auxiliary equipment that drives auxiliary equipment by utilizing the rotation of at least one of an internal combustion engine and an electric motor, and adds the drive by both the internal combustion engine and the electric motor to the auxiliary equipment. Drive transmission means for transmitting is provided. According to this aspect, it is possible to effectively control the driving of the auxiliary machinery.

  The auxiliary device driving apparatus according to the present invention may drive the electric motor so that the rotational speed of the auxiliary machinery is reduced when the rotational speed of the auxiliary machinery is equal to or higher than a predetermined value. According to this aspect, the reliability of auxiliary machinery can be improved.

  When the rotational speed of the auxiliary machinery reaches a predetermined value, the electric motor may be driven so that the rotational speed of the auxiliary machinery does not exceed the predetermined value. According to this aspect, it is possible to suppress inconveniences such as noise caused by the rotation speed of auxiliary machinery exceeding a predetermined value.

  The auxiliary machinery may include a vacuum pump that adjusts the negative pressure of the brake booster. When the internal combustion engine is driving a vacuum pump and the negative pressure of the brake booster is below a predetermined value, the rotational speed higher than the rotational speed that the internal combustion engine gives to the vacuum pump by driving the electric motor The vacuum pump may be driven by According to this aspect, the negative pressure of the brake booster can be adjusted effectively.

  According to the auxiliary device drive apparatus of the present invention, the simple structure can reduce the influence on the fuel efficiency improvement and the exhaust gas reduction, and can improve the reliability of the auxiliary equipment such as a vacuum pump. A class of driving devices can be provided.

  Hereinafter, embodiments of the present invention (hereinafter referred to as “embodiments”) will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a drive device for auxiliary machinery according to the first embodiment. In the present embodiment, the vacuum pump 18 will be described as an example of auxiliary equipment.

  A vehicle generally includes a braking assist device such as a brake booster having a brake assist function for increasing a driver's brake operation force. Such a braking assist device stores the negative pressure generated in the intake passage of the internal combustion engine in a pressure accumulating mechanism provided in a brake booster or the like, and uses the negative pressure of the pressure accumulating mechanism as a boost pressure at the time of brake operation. It is carried out. A vacuum pump 18 using an internal combustion engine or an electric motor as a drive source for supplying a negative pressure to the pressure accumulating mechanism is provided for the case where the negative pressure is lowered.

  In this figure, the brake booster 30 is a single type vacuum brake booster integrated with the master cylinder 50, and inside the case 40 there is a variable pressure chamber 43 a partitioned by a power piston 41 and a diaphragm 42. A low pressure chamber 43b as a pressure accumulating mechanism is formed. The case 40 houses a push rod 44 that connects the power piston 41 and the pressurizing piston of the master cylinder 50, and a spring 45 that biases the power piston 41 toward the brake pedal 32. The power piston 41 is provided with a switching portion capable of switching between communication / blocking between the variable pressure chamber 43a and the low pressure chamber 43b. The switching rod is an operating rod that is displaced by a depression operation of the brake pedal 32. 32a is connected.

  Thus, by using the negative pressure in the low pressure chamber 43b, the master cylinder 50 can be pressed via the operating rod 32a, the power piston 41, and the push rod 44 even when the brake pedal 32 is depressed with a small force. When the master cylinder 50 is pressed, hydraulic pressure is applied to the braking portion of the wheel through the hydraulic piping, and braking force is applied to the wheel.

  The brake booster 30 is not limited to a single type, and may be a tandem type including two power pistons 41 and two diaphragms 42. In addition, the brake booster 30 is not limited to an integral type, and may be a separate type configured separately from the master cylinder 50. Furthermore, the brake booster 30 is not limited to the one having the low pressure chamber 43b in the case 40, and a reserve tank may be connected to the case 40 as a separate storage device.

  The vacuum pump 18 and the low pressure chamber 43b are communicated with each other via a communication passage 38, and a check valve 36 that suppresses the inflow of air from the vacuum pump 18 to the low pressure chamber 43b is provided in the middle of the communication passage 38. It has been. A negative pressure sensor 34 is provided in the communication path 38 so that the negative pressure in the communication path can be detected.

  The vacuum pump 18 according to this embodiment is configured to be operable by the driving force of the camshaft 12 of the engine 10. Inside the vacuum pump 18, a rotor 16, which is a rotating part, driven by the camshaft 12 or the motor 20 is disposed, and the rotation of the rotor 16 ensures a negative pressure of the brake booster 30. It has come to be.

  A first one-way clutch 14 a is disposed between the camshaft 12 and one side of the shaft of the rotor 16 in the vacuum pump 18. A motor 20 is disposed on the opposite side of the vacuum pump 18 from the engine 10. A second one-way clutch 14 b is disposed between the drive shaft of the motor 20 and the other side of the shaft of the rotor 16 in the vacuum pump 18.

  Thereby, for example, when the engine 10 is operating and the camshaft 12 is rotating and the motor 20 is not rotating, the rotor 16 in the vacuum pump 18 is rotated by the driving force of the camshaft 12 to the vacuum pump 18. To do. Further, when the motor 20 is rotating while the engine is stopped and the camshaft 12 is also stopped rotating, the rotor 16 in the vacuum pump 18 is rotated by the driving force of the motor 20. In addition, when the engine 10 is operating and the camshaft 12 is rotating and the motor 20 is also rotating, the vacuum pump 18 is driven by the driving force of the camshaft 12 or the motor 20 having the higher rotational speed. The rotor 16 rotates.

  The vehicle has an electronic control unit (hereinafter referred to as “ECU”) 100, and an engine speed sensor 80 that detects the speed of the engine 10 is connected to the ECU 100. The engine speed sensor 80 is configured by, for example, an angle sensor provided on the crankshaft of the engine 10. In addition, a vehicle speed sensor 82 is connected to the ECU 100. The vehicle speed sensor 82 includes a wheel or a rotation sensor such as a hall element provided on a drive shaft that transmits driving to the wheel. In addition, an engine ON / OFF sensor 84 is connected to the ECU 100. The engine ON / OFF sensor 84 detects the ON / OFF of the engine, for example, by detecting the ON / OFF of the ignition switch. The ECU 100 is connected to the negative pressure sensor 34 and the motor 20. A relay 60 that turns the motor 20 on and off is provided between the ECU 100 and the motor 20.

  FIG. 2 is a flowchart showing the operation of the accessory driving apparatus according to the first embodiment. The processing in this flowchart may be started every predetermined time, or may be started when a button input is accepted.

  First, the ECU 100 determines whether the engine 10 is ON or OFF based on a detection signal from the engine ON / OFF sensor 84 (S11). If the engine 10 is OFF (N in S11), the processing in this flowchart is terminated.

If the engine 10 is determined to be ON (S11 of Y), ECU 100, based on the detection signal of the vacuum sensor 34, the booster negative pressure is determined whether the predetermined value _{P 0} is less than ( S12).

When it is determined that the booster negative pressure is smaller than the predetermined value P ₀ (Y in S12), the ECU 100 determines that the engine speed is lower than the predetermined value R ₀ based on the detection signal of the engine speed sensor 80. It is determined whether it is small (S13). Here, it is determined whether or not the engine speed is smaller than the predetermined value R ₀ because the vacuum pump 18 is connected to the camshaft 12 and the motor 20 of the engine 10 via the one-way clutch 14. This is because if the motor 20 cannot be rotated at a higher rotational speed than the engine rotational speed, the vacuum pump 18 cannot be driven by the motor 20.

If it is determined that the engine speed is smaller than the predetermined value _R0 (Y in S13), the ECU 100 inputs a motor ON signal that instructs the relay 60 to drive the motor 20, and starts driving the motor 20. Then (S14), the process in this flowchart is terminated.

  Thus, when the engine 10 is driving the vacuum pump 18 and the negative pressure of the brake booster becomes equal to or lower than a predetermined value, the motor 20 has a higher rotational speed than the rotational speed that the engine 10 gives to the vacuum pump 18. By giving to the vacuum pump, the vacuum pump 18 can be rotated at a higher rotational speed than the rotational speed of the engine, and high pressure accumulation performance can be obtained. That is, compared with the case where the vacuum pump 18 is driven only by the engine 10, the capacity of the vacuum pump 18 can be reduced, thereby reducing the driving torque for driving the vacuum pump 18, thereby reducing fuel consumption. can do.

  When it is determined that the booster negative pressure is greater than or equal to a predetermined value (N in S12) and when the engine speed is determined to be greater than or equal to a predetermined value (N in S13), the ECU 100 causes the relay 60 to A motor OFF signal for instructing the stop of the drive of 20 is input, the drive of the motor 20 is stopped (S15), and the processing in this flowchart is ended. As a result, when the motor 20 is ON, the vacuum pump 18 is driven by the motor 20 even when the booster negative pressure becomes sufficiently high or the engine 10 has a high rotational speed so that the motor 20 rotates. When the motor 20 cannot be rotated, the rotation of the motor 20 can be stopped, and the wear durability of the motor 20 can be improved.

  In the above flow, ECU 100 may turn on motor 20 when it is determined that the speed of the vehicle is greater than a predetermined value based on a detection signal from vehicle speed sensor 82. Thereby, the high pressure accumulation performance of the brake booster 30 can be obtained at high speeds where high braking performance is required.

Further, the predetermined value P ₀ of the booster negative pressure may be changed according to the speed of the vehicle. Thereby, the pressure accumulation performance of the brake booster 30 can be changed according to the speed of the vehicle, and the braking performance of the vehicle can be obtained effectively.

(Second Embodiment)
FIG. 3 is a flowchart showing the operation of the auxiliary device drive apparatus according to the second embodiment. The processing in this flowchart may be started every predetermined time, or may be started when a button input is accepted.

  The ECU 100 determines whether or not the engine 10 has been turned OFF from the ON state based on the detection signal from the engine ON / OFF sensor 84 (S21). If the engine remains on (N in S21), the processing in this flowchart is terminated.

  When it is determined that the engine 10 has changed from the ON state to the OFF state (Y in S21), the ECU 100 determines whether the motor 20 is OFF, that is, whether the motor 20 is not driven (S22). ). Whether or not the motor 20 is OFF can be determined by referring to the ON flag of the motor 20, for example.

  When it is determined that the motor 20 is OFF (Y in S22), the ECU 100 inputs a motor ON signal that instructs the relay 60 to drive the motor 20, and starts driving the motor 20 (S23). The ECU 100 measures a time during which the motor 20 is driven from when the engine 10 is turned off by a timer, and when a predetermined time ΔT seconds elapses from when the engine 10 is turned off, the ECU 20 sends the motor 20 A motor OFF signal for instructing to stop driving is input to stop driving the motor 20 (S24). When the driving of the motor 20 is stopped, the processing in this flowchart is terminated.

  When it is determined that the motor 20 is ON (N in S22), the ECU 100 causes the relay 60 to drive the motor 20 when ΔT seconds, which is a predetermined time, has elapsed since the engine 10 was turned OFF. A motor OFF signal for instructing the stop is input, and the drive of the motor 20 is stopped (S24). When the driving of the motor 20 is stopped, the processing in this flowchart is terminated.

  While the engine 10 is in operation, oil is supplied from the engine 10 to auxiliary equipment such as the vacuum pump 18, and when the engine 10 stops, the supply of oil from the engine 10 to the auxiliary equipment stops. However, if the engine 10 is stopped, oil will remain in the accessories. According to the auxiliary device driving apparatus according to the present embodiment, when the driving of the engine 10 is stopped from the state where the auxiliary device such as the vacuum pump 18 is driven by the engine 10, the motor 20 is rotated for a short time. By doing so, the oil remaining in the auxiliary machinery such as the vacuum pump 18 can be discharged into the engine 10. As a result, for example, when starting at a low temperature, it is not necessary to discharge the oil having increased viscosity, the burden on the auxiliary equipment such as the vacuum pump 18 can be reduced, and high reliability of the auxiliary equipment is ensured. Can do.

  The ECU 100 does not determine whether or not the engine 10 has been turned off from the ON state, but determines whether or not the vehicle speed has become 0 km / h based on the detection signal from the vehicle speed sensor 82. May be. Thereby, even when the vehicle speed becomes 0 km / h, the oil in the auxiliary equipment such as the vacuum pump 18 can be discharged into the engine 10, and similarly, the high reliability of the auxiliary equipment is ensured. Can do.

(Third embodiment)
FIG. 4 is a flowchart showing the operation of the auxiliary device drive apparatus according to the third embodiment. The processing in this flowchart may be started every predetermined time, or may be started when a button input is accepted. In the present embodiment, a so-called hybrid vehicle that obtains power for running a vehicle by an internal combustion engine and an electric motor will be described as an example.

  The ECU 100 first determines whether or not the motor 20 is ON, that is, whether or not the motor 20 is driving (S31). If the motor 20 is not driven (N in S31), the processing in this flowchart is terminated.

  If it is determined that the motor 20 is ON (Y in S31), the ECU 100 determines whether stop control of the engine 10 is being performed (S32). The engine 10 being in stop control refers to a case where, for example, in a hybrid vehicle, since the battery is sufficiently charged, the engine 10 that is an internal combustion engine is controlled to stop. When the stop control of the engine 10 is not being performed, that is, when the engine 10 is operating (N in S32), the oil is supplied to the auxiliary machines such as the vacuum pump 18, so the processing in this flowchart is ended. To do.

If it is determined that the engine 10 is under stop control (Y in S32), the ECU 100 determines that the accumulated drive time of the motor 20 during engine stop is less than T ₀ based on the drive time of the motor 20 measured by the timer. It is determined whether it is larger (S33). If the driving cumulative time of the motor 20 during engine stoppage is determined to be smaller than T ₀ finishes the process (S33 of N), the flowchart.

When it is determined that the accumulated driving time of the motor 20 while the engine is stopped is longer than T ₀ (Y in S33), the ECU 100 cancels the stop control of the engine 10 for T ₁ second and starts driving the engine 10. (S34).

  While the engine 10 is in operation, oil is supplied from the engine 10 to the auxiliary machines such as the vacuum pump 18. However, when the engine 10 is stopped, the supply of oil from the engine 10 to the auxiliary machines is stopped. For this reason, when the motor 20 is driven for a long time while the engine 10 is stopped, the auxiliary machinery is driven without supplying oil to the auxiliary machinery. As in this embodiment, when the driving time of the motor 20 exceeds a predetermined time while the engine 10 is stopped, the operation of the engine 10 is started and oil is supplied to the auxiliary machinery. Performance and reliability can be ensured.

  In the drive control of the vacuum pump 18, before canceling the stop control of the engine 10, the ECU 100 determines whether the booster negative pressure is lower than a predetermined value, and the booster negative pressure is lower than the predetermined value. If it is lower, the stop control of the engine 10 may be canceled and the drive of the engine 10 may be started. Thereby, oil can be effectively supplied to auxiliary machinery.

  Further, instead of canceling the stop control of the engine 10, oil may be supplied to the auxiliary equipment by an electric hydraulic pump or the like. Thereby, oil can be supplied to the auxiliary machines without starting the engine 10.

(Fourth embodiment)
FIG. 5 is a diagram showing the noise level of the vacuum pump 18 with respect to the rotational speed of the engine 10 that drives the vacuum pump 18. As the rotational speed of the engine 10 increases, the noise level of the vacuum pump 18 also gradually increases. However, the noise level of the vacuum pump 18 may increase when the rotational speed of the engine 10 falls within a predetermined range due to the resonance of the rotor 16 of the vacuum pump 18 and the like due to the rotation of the engine 10. .

In this figure, the noise level of the vacuum pump 18 generally increases gently as the rotational speed of the engine 10 increases. However, for reasons such as the resonance rotational speed of the engine 10 there is a case in which the noise level of the vacuum pump 18 becomes high at between R ₁ of R _2. When the rotational speed of the engine 10 is maintained at between R ₁ of R _2, would be maintained becomes higher noise level of the vacuum pump 18. In this case, for example, by switching the drive source of the vacuum pump 18 from the engine 10 to the motor 20, the rotational speed for driving the vacuum pump 18 may be set to a rotational speed other than between R ₁ and R ₂ .

  FIG. 6 is a flowchart showing the operation of the auxiliary device drive apparatus according to the fourth embodiment. The processing in this flowchart may be started every predetermined time, or may be started when a button input is accepted.

First, the ECU 100 determines whether or not the rotation speed of the engine 10 that drives the vacuum pump 18 has continued for T ₂ seconds or more at a rotation speed higher than R _{1 and} lower than R ₂ , which is a rotation speed at which the noise level of the vacuum pump 18 is high. Determine whether. Time speed is a low rotational speed higher than R ₂ than R ₁ of the engine 10, the rotational speed of the engine 10 is measured by the timer from when low rotational speed higher than R ₂ than R _1. If the engine 10 has a rotational speed lower than R ₁ or higher than R ₂ , or even if the rotational speed of the engine 10 is higher than R _{1 and} lower than R ₂ , this rotational speed is only T ₂ seconds or less. If it is determined that the process has not been continued (N in S41), the process in this flowchart is terminated.

If it is determined that the rotational speed of the engine 10 that drives the vacuum pump 18 is higher than R _{1 and} lower than R ₂ and this rotational speed has continued for T ₂ seconds or longer (Y in S41), the ECU 100 60 enter the oN signal of the motor 20 starts driving of the motor 20 in (S42), the motor 20 drives the vacuum pump 18 at a higher rotational speed than _{R 2.} As a result, the vacuum pump 18 can be driven at a rotational speed higher than the rotational speed in a predetermined range where the noise level of the vacuum pump 18 is high, and the noise level of the vacuum pump 18 can be reduced.

When the motor 20 is turned on, the ECU 100 determines whether the rotational speed of the engine 10 is smaller than R ₁ or whether the rotational speed of the engine 10 is larger than R ₂ (S43). When it is determined that the rotational speed of the engine 10 is maintained at a rotational speed higher than R _{1 and} lower than R ₂ (N in S43), the ECU 100 again restarts the rotational speed of the engine 10 from R ₁ after a predetermined time. or becomes smaller, or the rotational speed of the engine 10 to determine whether it is greater than R ₂ (S43). Thus if the rotational speed of the engine 10 is less than R _1, or the rotational speed of the engine 10 repeats this operation until greater than R _2.

When it is determined that the number of revolutions of the engine 10 is less than R ₁ or the number of revolutions of the engine 10 is greater than R ₂ (Y in S43), the ECU 100 inputs an OFF signal of the motor 20 to the relay 60 Then, the driving of the motor 20 is stopped (S44). Thereby, the drive time which drives the motor 20 can be reduced, and the reliability of the motor 20 can be improved.

In addition, when the rotation speed of the engine 10 is maintained at a rotation speed higher than R _{1 and} lower than R _{2 for} a long time, for example, the rotation speed of the engine 10 is maintained at a rotation speed higher than R _{1 and} lower than R ₂ . Even in such a case, the motor 20 may be intermittently driven by turning off the motor 20 after a lapse of a predetermined time from turning on the motor 20 and turning off the motor 20 again after the lapse of a predetermined time. Thereby, the drive time of the motor 20 can be reduced and the reliability of the motor 20 can be improved.

  In addition, although drive control of the vacuum pump 18 was illustrated in this embodiment, it is applicable also to auxiliary machines other than a vacuum pump.

(Fifth embodiment)
FIG. 7 is a diagram illustrating a configuration of a drive device for auxiliary machinery according to the fifth embodiment. In the present embodiment, the vacuum pump 18 will be described as an example of auxiliary equipment. In addition, about the same location as the above-mentioned embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the present embodiment, the vacuum pump 18 is not directly connected to the camshaft 12 of the engine 10 but is connected via the differential mechanism 24. The gear of the differential mechanism 24 meshes with a motor gear 22 provided on the rotating shaft of the motor 20. The differential mechanism 24 transmits the drive of one of the engine 10 and the motor 20 to the vacuum pump 18 and drives both the engine 10 and the motor 20 to drive the vacuum pump 18. To communicate. Thereby, when one of the engine 10 or the motor 20 is driven, the drive of the one can be transmitted to auxiliary machinery such as the vacuum pump 18, and when both the engine 10 and the motor 20 are driven, both drives are driven. Can be transmitted to the auxiliary machines, so that the auxiliary machines can be driven efficiently. Further, by rotating the motor 20 in the reverse direction, auxiliary equipment such as the vacuum pump 18 can be driven at a lower rotational speed than the rotational speed of the engine 10, and the reliability of the auxiliary equipment can be improved.

  FIG. 8 is a diagram illustrating the configuration of the differential mechanism 24 according to the fifth embodiment. The camshaft 12 of the engine 10 is connected to the input shaft 74 of the differential mechanism 24. The input shaft 74 is fixed to the first bevel gear 66, and the first bevel gear 66 meshes with the second bevel gear 72. The second bevel gear 72 meshes with the third bevel gear 68, and the third bevel gear 68 is fixed to the output shaft 78. Thereby, when the input shaft 74 is driven, the output shaft 78 rotates.

  The second bevel gear is rotatably inserted into the shaft 76, and the shaft 76 is fixed to the gear 70. The gear 70 meshes with the motor gear 22 fixed to the rotation shaft of the motor 20. Thus, when the motor 20 is driven, the gear 70 rotates and the output shaft 78 is rotated via the second bevel gear 72 and the third bevel gear 68. Thus, when one of the engine 10 or the motor 20 is driven, the drive of the one is transmitted to the vacuum pump, and when both the engine 10 and the motor 20 are driven, both of the drives are transmitted to the vacuum pump 18. it can.

  FIG. 9 is a flowchart showing the operation of the auxiliary device drive apparatus according to the fifth embodiment. The processing in this flowchart may be started every predetermined time, or may be started when a button input is accepted.

  The ECU 100 determines whether or not the engine 10 is ON based on a detection signal from the engine ON / OFF sensor 84 (S51). If the engine 10 is OFF (N in S51), the processing in this flowchart is terminated.

If the engine 10 is determined to be ON (S51 of Y), ECU 100, based on the detection signal from the engine speed sensor 80, whether or not the rotational speed of the engine 10 is higher than the predetermined rotational speed _{R h} Is determined (S52). If the rotational speed of the engine 10 is equal to or less than the predetermined rotational speed R _h (S52 of N), ECU 100 determines that it is not the rotational speed of the auxiliary machines, such as vacuum pump 18 is too high Then, the processing in this flowchart is terminated without reducing the drive rotation speed of the auxiliary machinery.

If the rotational speed of the engine 10 is determined to a predetermined larger number of revolutions _{R h} (S52 of Y), ECU 100, by inputting a reverse rotation ON signal of the motor 20 to the relay 60 of the motor 20, the motor 20 Is reversely rotated (S53). As a result, when the rotational speed of the engine 10 that drives the auxiliary equipment becomes equal to or higher than a predetermined value, the motor 20 can be reversely rotated to reduce the rotational speed of the auxiliary equipment. Can be prevented from being driven at a high rotational speed, and the reliability of the auxiliary machinery can be improved.

  It should be noted that when the auxiliary machines such as the vacuum pump 18 are driven by the engine and the rotational speed of the engine 10 exceeds a predetermined value, the rotational speed of the auxiliary equipment exceeds the predetermined value. You may drive the motor 20 so that there may not be. As a result, for example, when the auxiliary machinery is driven at a rotational speed equal to or higher than the predetermined value, the noise level becomes high, so that the rotational speed of the auxiliary machinery can be suppressed below the predetermined value. The level can be reduced.

  The present invention is not limited to the above-described embodiments, and an appropriate combination of the elements of each embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and embodiments to which such modifications are added can also be included in the scope of the present invention. Here are some examples.

  Auxiliaries such as the vacuum pump 18 may be driven not by the camshaft 12 but by a crankshaft or the like when driven by the engine 10 which is an internal combustion engine. In addition, the auxiliary machinery may be transmitted with the drive of the engine 10 via a rotating shaft such as a camshaft 12 or a crankshaft and a pulley belt. Thereby, flexible arrangement | positioning of auxiliary machines is realizable.

  The motor 20 is not only turned ON / OFF by the relay 60, but the ECU 100 may control the rotational speed of the motor 20 by the ECU 100 inputting a drive signal such as a pulse signal to the motor 20. Thereby, the control of the rotational speed of auxiliary machinery such as the vacuum pump 18 can be performed more finely.

  In the first embodiment, the driving of the engine 10 and the motor 20 is not switched using the one-way clutch 14, but the vacuum pump 18 is connected to the cam of the engine 10 via the differential mechanism 24 as in the fifth embodiment. It may be connected to the shaft 12. As a result, when the vacuum pump 18 is driven by the engine 10 and the negative pressure of the brake booster 30 falls below a predetermined value, the motor 20 is driven and the differential mechanism 24 drives both. By transmitting to the vacuum pump 18, the vacuum pump 18 can be driven at a higher rotational speed than the rotational speed of the engine 10. For this reason, the booster negative pressure can be increased by effectively increasing the rotational speed for driving the vacuum pump 18.

  In the second embodiment, the driving of the engine 10 and the motor 20 is not switched using the one-way clutch 14, but the vacuum pump 18 is connected to the cam of the engine 10 via the differential mechanism 24 as in the fifth embodiment. It may be connected to the shaft 12. Thereby, while realizing effective driving of auxiliary machinery by the differential mechanism 24, it is possible to reduce the burden on the auxiliary machinery such as the vacuum pump 18, and to ensure high reliability of the auxiliary machinery. Can do.

  In the third embodiment, the driving of the engine 10 and the motor 20 is not switched using the one-way clutch 14, but the vacuum pump 18 is connected to the cam of the engine 10 via the differential mechanism 24 as in the fifth embodiment. It may be connected to the shaft 12. As a result, it is possible to ensure the performance and reliability of the auxiliary equipment while realizing effective driving of the auxiliary equipment by the differential mechanism 24.

It is a figure which shows the structure of the drive device of auxiliary machines concerning 1st Embodiment. It is a flowchart which shows operation | movement of the drive device of auxiliary machines concerning 1st Embodiment. It is a flowchart which shows operation | movement of the drive device of auxiliary machines concerning 2nd Embodiment. It is a flowchart which shows operation | movement of the drive device of auxiliary machines concerning 3rd Embodiment. It is a figure which shows the noise level of a vacuum pump with respect to the rotation speed of the engine which drives a vacuum pump. It is a flowchart which shows operation | movement of the drive device of auxiliary machines concerning 4th Embodiment. It is a figure which shows the structure of the drive device of auxiliary machines concerning 5th Embodiment. It is a figure which shows the structure of the differential mechanism concerning 5th Embodiment. It is a flowchart which shows operation | movement of the drive device of auxiliary machines concerning 5th Embodiment.

Explanation of symbols

  10 engine, 12 camshaft, 14 one-way clutch, 16 rotor, 18 vacuum pump, 20 motor, 22 motor gear, 24 differential mechanism, 30 brake booster, 32 brake pedal, 34 negative pressure sensor, 36 check valve, 38 communication path, 40 Case, 41 Power Piston, 42 Diaphragm, 43a Transformer Chamber, 43b Low Pressure Chamber, 44 Push Rod, 45 Spring, 50 Master Cylinder, 60 Relay, 80 Engine Speed Sensor, 82 Vehicle Speed Sensor, 84 Engine ON / OFF Sensor.

Claims (10)

In an auxiliary device drive apparatus for driving auxiliary machinery by utilizing the rotation of at least one of an internal combustion engine and an electric motor,
A drive apparatus for auxiliary equipment, comprising drive transmission means for transmitting, to the auxiliary equipment, a drive having a higher rotational speed given to the auxiliary equipment among the internal combustion engine and the electric motor.   The drive transmission means includes a first one-way clutch disposed between the auxiliary machinery and the internal combustion engine, and a second one-way clutch disposed between the auxiliary machinery and the electric motor. 2. The drive device for auxiliary equipment according to claim 1, wherein a higher drive among the rotational speed given to the machinery and the rotational speed given to the auxiliary machinery by the electric motor is transmitted to the auxiliary machinery. The auxiliary machinery includes a vacuum pump for adjusting the negative pressure of the brake booster,
When the internal combustion engine is driving the vacuum pump and the negative pressure of the brake booster is below a predetermined value, the electric motor gives the vacuum pump a higher rotational speed than the rotational speed that the internal combustion engine gives to the vacuum pump. 3. The auxiliary drive apparatus according to claim 1, wherein the vacuum pump is driven at a higher rotational speed than the rotational speed that the internal combustion engine gives to the vacuum pump. In an auxiliary device drive apparatus for driving auxiliary machinery by utilizing the rotation of at least one of an internal combustion engine and an electric motor,
Auxiliaries are supplied with oil by the operation of the internal combustion engine, and the motor discharges oil by driving the accessories,
A drive apparatus for auxiliary equipment, wherein when the internal combustion engine is stopped from a state where the internal combustion engine is operating, the electric motor drives the auxiliary equipment for a predetermined time. In an auxiliary device drive apparatus for driving auxiliary machinery by utilizing the rotation of at least one of an internal combustion engine and an electric motor,
Auxiliaries are supplied with oil by the operation of the internal combustion engine, and the motor discharges oil by driving the accessories,
A drive device for auxiliary equipment, wherein the internal combustion engine is operated when the electric motor drives the auxiliary equipment for a predetermined time or longer with the internal combustion engine stopped. In an auxiliary device drive apparatus for driving auxiliary machinery by utilizing the rotation of at least one of an internal combustion engine and an electric motor,
When the internal combustion engine is driving the auxiliary machinery and the internal combustion engine rotates at a rotational speed within a predetermined range for a predetermined time or longer, the auxiliary machinery is driven at a rotational speed other than the rotational speed within the predetermined range. A drive device for auxiliary machinery, wherein the motor is driven as described above. In an auxiliary device drive apparatus for driving auxiliary machinery by utilizing the rotation of at least one of an internal combustion engine and an electric motor,
A drive device for auxiliary equipment, comprising drive transmission means for adding and transmitting the drive by both the internal combustion engine and the electric motor to the auxiliary equipment.   8. The driving apparatus for auxiliary equipment according to claim 7, wherein when the rotational speed of the auxiliary machinery becomes equal to or higher than a predetermined value, the electric motor is driven so that the rotational speed of the auxiliary machinery is reduced.   8. The auxiliary equipment according to claim 7, wherein when the rotational speed of the auxiliary equipment reaches a predetermined value, the motor is driven so that the rotational speed of the auxiliary equipment does not exceed the predetermined value. Drive device. The auxiliary machinery includes a vacuum pump for adjusting the negative pressure of the brake booster,
When the internal combustion engine is driving a vacuum pump and the negative pressure of the brake booster is below a predetermined value, the rotational speed higher than the rotational speed that the internal combustion engine gives to the vacuum pump by driving the electric motor 8. The auxiliary device driving apparatus according to claim 7, wherein the vacuum pump is driven by the motor.

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