JP2018155123A - Starting device of vehicle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load on a bearing of a crank journal generating when starting an engine by using a starter generator in a vehicle engine including the starter generator, and to improve durability and reduce cost of the bearing of the crank journal.SOLUTION: When viewed from a crank shaft direction, a starter generator 23 is arranged on one side with respect to a reference line in a direction orthogonal to a crank shaft 15, and a water pump 25 and a compressor 27 for air conditioner which are auxiliary machines are arranged on the other side. A starting device of vehicle engine includes a clutch control part 45 for connecting and controlling a water pump clutch 25b, a compressor clutch 27b which are auxiliary clutches for connecting/disconnecting the auxiliary machines and auxiliary machine pulleys, when starting an engine 3 by the starter generator 23.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle engine starter, and more particularly, to a vehicle engine starter provided with a starter generator.

The starter generator has a function as a starter for starting the engine, and also has a function as an alternator that is driven by the engine to generate electric power.
Generally, a vehicle engine equipped with a starter generator has an idler pulley between a crank pulley fixed to an end of a crankshaft protruding from one end surface of the engine and a starter generator pulley provided in the starter generator. The belt is wound through a tension pulley or the like, and the same belt or another belt is wound around the auxiliary pulley.

  For example, Patent Document 1 discloses a configuration in which an internal combustion engine provided with a motor generator (starter generator) is designed to achieve a compact power transmission system and an engine and a low center of gravity of the engine. Specifically, the belt is sandwiched from above and below by the tension pulley of the pendulum type auto tensioner on both sides of the motor generator pulley, and the upper tension pulley is further away from the engine body than the lower tension pulley. It is shown that the motor generator is shifted downward as much as possible to lower the center of gravity while equalizing the tension with the lower part.

  Patent Document 2 discloses a tension adjusting method for an accessory driving belt and a tension adjusting device for an accessory driving belt, which are applied to a belt type starter generator system, and ensures a belt tension necessary for starting an engine. However, it has been shown to reduce belt tension after engine startup.

Japanese Patent Laid-Open No. 2006-8586 Japanese Patent No. 4258325

  As described above, a vehicle engine equipped with a starter generator is wound between a crank pulley fixed to an end of a crankshaft protruding from one end surface of the engine and a starter generator pulley provided in the starter generator. The driving force is transmitted through the belt.

  For this reason, when the engine is started, a bending force acts on the crankshaft via the belt, and therefore, a bending load of the crankshaft acts on the bearing of the crank journal that rotatably supports the crankshaft. In particular, No. 1 is arranged at the tip on the crank pulley side. One crank journal bearing has a greater load burden than other bearings. Moreover, at the time of starting, since the oil pump that supplies lubricating oil to the bearing is not yet fully operated, the bearing is not sufficiently lubricated, which may cause a problem in the durability of the crank journal bearing. is there.

  In addition, the most susceptible crank pulley side No. In one bearing, there is a problem that it is disadvantageous in terms of cost and friction because it requires high-performance metal and a grade upgrade by increasing the bearing width to reduce the bearing load.

  However, in Patent Documents 1 and 2, in a vehicle engine equipped with a starter generator, the load applied to the crank journal bearing generated when the engine is started using the starter generator is reduced. There is no indication of improving the durability and reducing costs.

  Accordingly, in view of the above technical problem, at least one embodiment of the present invention reduces a load applied to a bearing of a crank journal that is generated when a starter generator is used to start an engine in a vehicle engine including the starter generator. An object of the present invention is to provide a vehicle engine starter capable of improving the durability and reducing the cost of bearings of a crank journal.

(1) A vehicle engine starter according to at least one embodiment of the present invention includes a crank pulley attached to a crankshaft end of a vehicle engine, and a starter generator attached to a starter generator fixed to the engine body. A pulley, a first belt wound between the crank pulley and the starter generator pulley, an accessory pulley mounted on an accessory fixed to the engine body, the crank pulley and the accessory pulley, A starter for a vehicle engine comprising: a second belt wound around the vehicle;
When the starter generator is arranged on one side with respect to a reference line in a direction perpendicular to the crankshaft as viewed from the crankshaft direction, the auxiliary machine is arranged on the other side, and when the starter generator starts the engine, A clutch control unit that controls connection of an auxiliary machine clutch that connects and disconnects the auxiliary machine and the auxiliary machine pulley is provided.

According to the configuration (1), when the engine is started by the starter generator, the clutch control unit controls the connection of the accessory clutch that connects and disconnects the accessory and the accessory pulley. Acting on the second belt.
On the other hand, when the engine is started, the driving force of the starter generator acts on the crank pulley via the first belt.

  The force acting on the center portion of the crank pulley via the second belt, that is, the bending force of the crankshaft, and the force acting on the center portion of the crank pulley via the first belt, that is, the bending force of the crankshaft. Since the starter generator is arranged on one side and the auxiliary machine is arranged on the other side with respect to the reference line in the direction perpendicular to the crankshaft as viewed from the crankshaft direction, it is seen from the crankshaft direction. Acting in the direction of canceling each other.

As a result, the bending force acting on the crankshaft is reduced as compared with the case where the auxiliary machine is not connected. In particular, No1. It is effective in the bearing of the crank journal.
Therefore, it is possible to reduce the load applied to the bearing of the crank journal that is generated when the engine is started using the starter generator, and the durability of the bearing can be improved. As a result, it is not necessary to upgrade the bearing width by increasing the bearing width in order to reduce the load of the high performance metal, and the cost and friction can be improved.

  (2) In some embodiments, an oil temperature detecting unit that detects an oil temperature of lubricating oil to a bearing of a crank journal that rotatably supports the crankshaft is provided, and the clutch control unit includes: The on / off state of the auxiliary clutch is controlled based on the detected value.

  According to the above configuration (2), the clutch control unit intermittently engages the auxiliary clutch based on the detected value from the oil temperature detecting means for detecting the oil temperature of the lubricating oil to the bearing of the crank journal that rotatably supports the crankshaft. Therefore, it is possible to control the disengagement and connection of the auxiliary clutch based on whether or not the lubricating oil is at a temperature at which it can sufficiently perform the lubrication function. Improvement and cost reduction can be achieved effectively.

  (3) In some embodiments, the clutch control unit disconnects the auxiliary clutch when the detected value from the oil temperature detecting means exceeds a predetermined temperature, and when the detected value is equal to or lower than the predetermined temperature. Is connected to the auxiliary clutch.

According to the configuration (3), the clutch control unit disconnects the auxiliary machine clutch when the detected value from the oil temperature detecting means exceeds a predetermined temperature, and disconnects the auxiliary machine clutch when the detected value is lower than the predetermined temperature. Since it is connected, it is possible to effectively improve the durability and cost of the bearing of the crank journal.
That is, when the temperature is lower than the predetermined temperature, the auxiliary machine clutch is connected, and the force applied to the center of the crank pulley can be offset to reduce the bearing load of the crank journal. When the temperature exceeds the predetermined temperature, the auxiliary clutch can be disconnected to reduce the driving load of the starter generator and perform a quick start.

  (4) In some embodiments, the engine includes a starter for starting the engine separately from the starter generator, and when the duration of the engine stop state is a predetermined time or more, the starter generator A start control device that prohibits engine start and starts the engine by the starter is provided.

  According to the configuration (4), when the engine stopped state continues for a predetermined time or more, the lubricating oil supplied to the bearings of the crank journal falls to the oil pan and does not hold a sufficient oil film. For this reason, if the starter generator is started with the starter generator, an excessive burden may be generated on the bearing of the crank journal. Therefore, the starter generator is prohibited from starting and is started with the starter.

  The starter generator is configured to start by transmitting the driving force by pinion at the tip of the starter engaging the ring gear (flywheel outer periphery) directly assembled to the crankshaft. Compared with the starting of the above, the bearing load (the effect of bending force) on the bearing of the crank journal is reduced.

  (5) In some embodiments, the engine includes a starter for starting the engine separately from the starter generator, and prohibits start of the engine by the starter generator when the atmospheric temperature is equal to or lower than a predetermined temperature. And a start control device for starting the engine by the starter.

  According to the above configuration (5), when the atmospheric temperature is equal to or lower than the predetermined temperature, for example, when the temperature is below freezing, the lubricating performance of the lubricating oil supplied to the bearing of the crank journal is deteriorated. When starting with the starter generator, an excessive burden may be generated on the bearing of the crank journal. Therefore, starting with the starter generator is prohibited and starting is performed with the starter. Thereby, the bearing load (action of bending force) to the bearing of the crank journal is reduced.

  (6) In some embodiments, the reference line is a cylinder center line in the case of an in-line engine, and a center line between banks of a V-type engine in the case of a V-type engine. .

  According to the configuration (6), the reference line in the direction orthogonal to the crankshaft when viewed from the crankshaft direction is the cylinder centerline in the case of an in-line engine, and between banks of the V-type engine in the case of a V-type engine. Therefore, the starter generator arranged on one side of the reference line and the auxiliary machine arranged on the other side can be compactly arranged.

  (7) In some embodiments, the crank pulley has a two-stage hanging structure in the crankshaft direction, the first belt is wound on the engine side, and the second belt is wound on the side away from the engine. It is characterized by that.

According to the configuration (7), since the first belt is wound on the engine side of the two-stage structure, the bending moment force acting on the crank journal bearing by the starter generator acts on the side closer to the crank journal bearing. Since the second belt is wound around the side away from the engine, the bending moment force due to the load from the auxiliary machine acts on the side away from the bearing of the crank journal. The bending moment force is increased.
As a result, the bending moment force generated by the starter generator acting on the bearing of the crank journal can be effectively canceled (cancelled) by the bending moment force generated by the load from the auxiliary machine.

  According to at least one embodiment of the present invention, in a vehicle engine equipped with a starter generator, the load on the crank journal bearing generated when the engine is started using the starter generator is reduced, and the crank journal bearing is reduced. The durability can be improved and the cost can be reduced.

1 is a schematic configuration diagram of a starter for a vehicle engine according to an embodiment of the present invention. It is a conceptual diagram of the load which acts on the bearing of a crank journal. (A) is explanatory drawing of the force and direction which are applied to a pulley center, (B) is a conceptual diagram which shows the direction and magnitude | size of the force which acts on the center part of the crank pulley applied to the crank pulley of one Embodiment. is there. It is a control table which shows ON / OFF control of an auxiliary machine clutch. It is a control flowchart which shows control of a control apparatus. It is a control flowchart of the control apparatus which shows other one Embodiment.

  Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in these embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Only.

An overall configuration of a vehicle engine starter 1 according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a front view of a vehicle engine (hereinafter referred to as an engine) 3 as viewed from the crankshaft direction. The engine 3 shows an in-line three-cylinder engine as an example, and as main elements, a cylinder block 5, a cylinder head 7 fixed to the upper surface thereof, a head cover 9 fixed to the upper surface thereof, and a lower surface of the cylinder block 5 are fixed. The engine body is constituted by these, and one end portion of the crankshaft 15 projects outward from the front surface 13 of the cylinder block 5 of the engine body.

  A crank pulley 17 is fixed to one end of the crankshaft 15. The crank pulley 17 has a two-stage hanging structure, and the groove around which the belt is hung in the crankshaft direction is constituted by two rows of an outer groove 19 and an inner groove 21 (see FIG. 2).

  In FIG. 1, a line extending through the center of the crankshaft 15 and extending in the direction perpendicular to the center of the crankshaft and in the cylinder centerline direction of each cylinder is defined as a reference line K, and the starter generator 23 is provided on one side (left side) of the reference line K. Is arranged and attached to the cylinder block 5. Further, the starter generator 23 is disposed at a substantially intermediate portion in the vertical direction when the engine 3 of FIG. 1 is viewed from the front.

  On the other side (right side) of the reference line K, a water pump 25 that circulates engine cooling water is fixed at a substantially intermediate portion in the vertical direction when the engine 3 of FIG. 1 is viewed from the front. Furthermore, an air conditioner compressor 27 for the vehicle is disposed below the water pump 25.

  Thus, since the reference line K in the direction orthogonal to the crankshaft 15 when viewed from the direction of the crankshaft 15 is a line extending in the cylinder centerline direction, the starter generator 23 arranged on one side of the reference line K is used. And the water pump 25 and the compressor 27 for air conditioners which are auxiliary machines arrange | positioned at the other side can be arrange | positioned compactly.

  In this embodiment, an in-line engine is described. However, in the case of a V-type engine, a center line between banks of the V-type engine may be used as a reference line. By setting the reference line in this way, also in the V-type engine, the arrangement of the starter generator on one side and the auxiliary machine on the other side can be compactly arranged as in the case of the in-line engine.

  The starter generator 23, the water pump 25, and the air conditioner compressor 27 each include a starter generator pulley 23a, a water pump pulley 25a, and an air conditioner compressor pulley 27a that are fixed to the rotation shaft.

  Further, the water pump 25 and the air conditioner compressor 27 constituting the auxiliary machine are auxiliary machine clutches that switch connection and disconnection between the respective rotary shafts and the water pump pulley 25a and the air conditioner compressor pulley 27a. A water pump clutch 25b and a compressor clutch 27b are provided. The auxiliary machine is not limited to the water pump 25 and the air conditioner compressor 27, but may be any machine that is driven by the crank pulley 17 and arranged on the other side with respect to the reference line K.

  A first belt 29 is wound between the inner groove 21 of the crank pulley 17 and the starter generator pulley 23a. The outer groove 19 of the crank pulley 17, the water pump pulley 25a as an auxiliary pulley, and the compressor pulley for the air conditioner. A second belt 31 is wound around the belt 27a.

In the present embodiment, the first belt 29, the second belt 31, and the pulleys 17, 23a, 25a, and 27a rotate in the arrow direction shown in FIG. 1, that is, clockwise.
In addition, an auto tensioner 32 is provided on the loose side of the first belt 29 when the starter generator 23 functions as a starter for starting the engine 3 and can hold the belt tension at a predetermined tension by contacting the belt. Also in the second belt 31, an auto tensioner 34 is provided on the loose side of the second belt 31 so as to contact the belt and maintain the belt tension at a predetermined tension.

  The starter generator 23 has a function as a starter that starts the engine 3, and also has a function as an alternator that is driven by the engine 3 to generate electric power. Therefore, when the engine 3 is started, the starter generator 23 rotates the starter generator pulley 23a, and the driving force is transmitted to the crank pulley 17 and the crankshaft 15 via the first belt 29 to start the engine 3 (or Start).

  Once the engine 3 is started, the engine 3 can rotate the starter generator pulley 23a via the first belt 29 to drive the starter generator 23 and cause the starter generator 23 to generate power. Yes. The starter generator 23 not only generates electric power according to the electric load of the vehicle, such as driving of the on-vehicle air conditioner and lighting of the headlamps, but also generates electric power even when there is no electric load of the vehicle under the control of the control device 33. The engine 3 can be actively loaded.

Next, with reference to FIGS. 2 and 3, a description will be given of the load applied to the bearing 35 (35 a, 35 b, 35 c, 35 d) of the crank journal generated when the engine 3 is started using the starter generator 23 and the reduction thereof. To do.
FIG. 2 shows a conceptual diagram of loads acting on the crank journal bearing 35 (35a, 35b, 35c, 35d). FIG. 3 is an explanatory diagram for explaining the direction and magnitude of the force acting on the central portion of the crank pulley 17.

In FIG. 2, the force applied to the center of the crank pulley 17 includes a force P <b> 1 acting from the starter generator 23 via the first belt 29, a water pump 25 which is an auxiliary load via the second belt 31, and an air conditioner compressor. The force P2 which acts from 27 is applied.
As shown in FIG. 2, the forces P1 and P2 applied to the center of the crank pulley 17 share the load (R1 to R4) by journal bearings 35 (35a, 35b, 35c, and 35d) of the crankshaft 15. Therefore, the No. closest to the crank pulley 17 is set. The load concentrates on one bearing 35a.

  FIG. 3A is an explanatory diagram of the force and direction applied to the pulley center, and the force Frad applied to the pulley center is generally given by the following equation (1).

Ｆｒａｄ:ラジアル荷重（プーリ中心に掛かる力）
Ｔｓ１：始動（運転）時張り（緩み）側張力（Ｎ）
Ｔｓ２：始動（運転）時緩み側（張り）側張力（Ｎ）
θｓｇ：プーリ掛り角（ｄｅｇ）

Frad: Radial load (force applied to pulley center)
Ts1: Tension (loosening) side tension (N) at start (operation)
Ts2: Loose side (tension) side tension (N) at start (operation)
θsg: Pulley angle (deg)

  In the above formula (1), either Ts1 or Ts2 may be the tension side or the loose side. In addition, the radial load is applied in the same direction regardless of whether it is driven or driven. Further, the direction of radial load is determined by the direction of the tension side and loose side belts. Further, the direction of the radial load is determined in the bisection direction of the pulley hook angle.

  Based on the above formula (1), the force P1 acting on the center of the crank pulley 17 from the starter generator 23 via the first belt 29, the water pump 25 and the air conditioner that are auxiliary loads via the second belt 31. FIG. 3B shows the force P2 that acts on the center of the crank pulley 17 from the compressor 27 and shows it.

  Accordingly, the force acting on the center portion of the crank pulley 17 via the second belt 31, that is, the bending force of the crankshaft 15, and the force acting on the center portion of the crank pulley 17 via the first belt 29, ie, the crank The bending force of the shaft 15 means that a starter generator 23 is arranged on one side with respect to a reference line K in a direction orthogonal to the crankshaft 15 when viewed from the direction of the crankshaft 15, and a water pump 25 of an auxiliary machine is arranged on the other side. Since the air conditioner compressor 27 is disposed, the compressors 27 act in the direction of canceling each other when viewed from the crankshaft direction. That is, the horizontal component force of P1 and P2 in FIG.

  As a result, the bending force acting on the crankshaft 15 is reduced as compared with the case where the auxiliary machine is not connected. Therefore, the crank journal bearing 35 generated when the starter generator 23 is used to start the engine, particularly No. The load on one bearing 35a can be reduced, and the durability of the bearing can be improved and the cost can be reduced. For this reason, it is not necessary to upgrade the bearing width by increasing the bearing width in order to reduce the bearing load, and it is possible to improve the cost and friction.

  Further, as shown in FIG. 2, the first belt 29 is wound around the inner groove 21 of the crank pulley 17, and the force P <b> 1 acting on the center of the crank pulley 17 from the starter generator 23 via the first belt 29 is It arrange | positions in the position which approaches the bearing 35 of a crank journal (L1 of FIG. 2), and is arrange | positioned so that the bending moment force which acts on the bearing 35 of a crank journal by the starter generator 23 may be made small.

  Further, the second belt 31 is wound around the outer groove 19 of the crank pulley 17, and the force P <b> 2 acting from the water pump 25 and the air conditioner compressor 27 that are auxiliary loads via the second belt 31 is applied to the crank journal. It arrange | positions in the position away from the bearing 35 (L2 of FIG. 2), and arrange | positions so that the bending moment force which acts on the bearing 35 of a crank journal by the load from an auxiliary machine may be enlarged.

  As a result, it is possible to effectively cancel (cancel) the bending moment force acting on the crank journal bearing 35 by the starter generator 23 acting on the crank journal bearing 35 and the bending moment force caused by the load from the auxiliary machine. Thus, the adverse effect due to the bending load acting on the bearing 35 can be effectively reduced.

Next, the control device 33 will be described with reference to FIGS.
The control device 33 is provided with a signal input unit, a signal output unit, a storage unit, a calculation unit, and the like (not shown). As shown in FIG. 1, signals from various sensors that detect the state of the engine 3 are input to the signal input unit. For example, signals from an oil temperature sensor 37 that detects the temperature of the lubricating oil supplied to the bearing 35 of the crank journal, a rotation speed sensor 39 that detects the engine speed, and an outside air temperature sensor 41 that detects the outside air temperature of the vehicle. Entered. Further, an ON signal of an ignition switch 43 that is operated when the driver starts the engine is input.

As shown in FIG. 1, the control device 33 mainly includes a clutch control unit 45 and an engine start control unit 47.
The clutch control unit 45 controls the water pump clutch 25b and the compressor clutch 27b to be connected when the engine 3 is started by the starter generator 23.
In addition, the engine start control unit 47 performs start control when an ON signal of the ignition switch 43 is input, and engine start control at the time of restart after the engine 3 is automatically stopped by an idle stop signal. Do.

The control by the clutch control unit 45 and the engine start control unit 47 of the control device 33 is summarized in the control table shown in FIG.
As shown in FIG. 4, when the operation pattern is extremely cold or the engine is started by the ignition switch 43, the starting power is started by the starter (cell motor) 49. In this case, the auxiliary pump water pump clutch 25b and the compressor clutch 27b are turned off and disconnected. In this case, it is the same as the normal engine start, and the starter generator 23 is not driven.

  When the operation pattern is before the engine is warmed up (below the oil temperature threshold), the starting power is started by the starter generator 23. In this case, the auxiliary pump water pump clutch 25b and compressor clutch 27b are turned on and connected. This cancels the force applied to the center of the crank pulley 17 and reduces the bearing load of the crank journal.

When the operation pattern is after the engine is warmed up (over the temperature threshold value), the starting power is started by the starter generator 23. In this case, the auxiliary pump water pump clutch 25b and the compressor clutch 27b are turned off and disconnected. As a result, the drive load of the starter generator 23 is reduced and a quick start is performed.
The oil temperature threshold is, for example, a predetermined temperature set within a range of 50 ° C. to 60 ° C., and is a temperature at which the lubricating performance of the lubricating oil is exhibited when the predetermined temperature is reached.

Next, a control flowchart will be described with reference to FIG.
First. In step S1, the engine start switch is turned on. This engine start switch ON is an engine start signal when an ON signal (start signal) from the ignition switch 43 is input and when the engine 3 is automatically stopped by an idle stop signal after restarting the engine. Including both cases.

  Next, in step S2, it is determined whether the engine is started by the ignition switch 43. In the case of No, in the case of starting other than the ignition switch 43, that is, in the case of starting in the case of the engine start signal at the time of restart after the engine is automatically stopped by the idle stop signal, the process proceeds to step S3.

  Next, in step S3, the starter generator 23 is started. In step S4, it is determined whether the detected temperature from the oil temperature sensor 37 that detects the temperature of the lubricating oil is equal to or lower than a threshold temperature. This threshold temperature is a predetermined temperature set in the range of 50 ° C. to 60 ° C. as described above. If the temperature is equal to or lower than the threshold temperature, the process proceeds to step S5 to turn on the accessory clutch. That is, the water pump clutch 25b and the compressor clutch 27b are connected.

  If the oil temperature exceeds the threshold temperature in step S4, the process proceeds to step S6 to turn off the auxiliary machine clutch. That is, the water pump clutch 25b and the compressor clutch 27b are disconnected.

Thereafter, in step S7, it is determined whether the engine 3 has been started. This determination is made based on whether or not the engine speed has reached a speed at which it can be determined that the start has been completed based on a signal from the engine speed sensor 39 that detects the engine speed. If it is determined that the engine 3 has started, in step S8, the connected water pump clutch 25b and compressor clutch 27b are turned off again. .
If it is determined in step S7 that the engine 3 has not been started, the process returns to step S3 and the starter generator 23 is repeatedly started. If the starter generator 23 does not start even if it is repeated, the starter 49 may be switched to the start by a predetermined number of times, for example, from the third time to start by the starter 49.

  On the other hand, if it is determined in step S2 that the ignition switch 43 has been started, the process proceeds to step S14, where starter (cell motor) 49 starts. In step S15, as in steps 7 and 7, it is determined whether the engine 3 has started based on the engine speed. If it is determined that the engine has started, the process ends. If it is determined that the engine has not started, the process returns to step S14 and the starter 49 repeats the start.

  According to the embodiment described above, the starter generator 23 is arranged on one side with respect to the reference line K in the direction orthogonal to the crankshaft 15 when viewed from the crankshaft direction, and the auxiliary machine is arranged on the other side. When starting the engine 3 with the generator 23, the clutch control unit 45 controls the connection of the water pump clutch 25b and the compressor clutch 27b, so that the load of the auxiliary machine acts on the crank pulley 17 via the second belt 31. Since the driving force of the starter generator 23 acts on the crank pulley 17 via the first belt 29, the force applied to the center of the crank pulley 17 is canceled out, and the bearing load of the crank journal can be reduced.

  When the detected value from the oil temperature sensor 37 by the clutch control unit 45 exceeds a predetermined temperature, the water pump clutch 25b and the compressor clutch 27b are disconnected, and when the detected value is lower than the predetermined temperature, the water pump clutch 25b and the compressor Since the clutch 27b is connected, the auxiliary clutch is connected when the temperature is lower than the predetermined temperature, and the load applied to the center of the crank pulley 17 can be canceled to reduce the bearing load of the crank journal. Can cut off the auxiliary machine clutch and reduce the driving load of the starter generator 23 to perform a quick start. As a result, the durability and cost reduction of the bearing 35 of the crank journal can be effectively achieved.

Another embodiment will be described with reference to the flowchart of FIG.
The embodiment shown in FIG. 6 is obtained by adding steps S12 and S13 to the embodiment of FIG. The other steps are the same as those in FIG. 5, and the same step numbers are assigned to the same steps and the description thereof is omitted.

  If it is determined in step S2 that the engine is not started by the ignition switch 43, the process proceeds to step S12. In step S12, it is determined whether a predetermined time or more has elapsed since the previous start. This fixed time is, for example, a few days or more. If the predetermined time or more has elapsed, the process proceeds to step S14 where the starter 49 starts the engine.

  On the other hand, if No in step S12, the process proceeds to step S13 to determine whether it is extremely cold. During this extremely cold time, the outside air temperature sensor 41 determines whether or not the outside air temperature is below freezing point (zero ° C. or less). If it is below the freezing point, the result of step S12 is Yes, the process proceeds to step S14, and the starter 49 starts. When step S12 is No, it progresses to step S3 and the starter generator 23 starts.

  According to the embodiment shown in FIG. 6, when the engine stopped state continues for a predetermined time or more, for example, when a few days have passed, the lubricating oil supplied to the bearing 35 of the crank journal Therefore, if the starter generator 23 is started when the engine is started, an excessive load may be generated on the bearing 35 of the crank journal. Therefore, the starter generator 23 is prohibited from starting and the starter 49 is started. To do.

  The starter (cell motor) 49 is started by a pinion at the tip of the starter 49 being engaged with the ring gear (outer periphery of the flywheel) directly attached to the crankshaft 15 to transmit the driving force to start. Therefore, the action of the bending force on the bearing of the crank journal is reduced compared to the start of the starter generator 23.

  Further, when the atmospheric temperature is lower than the predetermined temperature, for example, when the temperature is below freezing, the lubrication performance of the lubricating oil supplied to the bearing 35 of the crank journal is deteriorated, so the starter generator 23 is started when starting the engine. If this is done, an excessive burden may be generated on the bearing 35 of the crank journal. Therefore, the starter generator 23 is prohibited from starting and the starter 49 starts.

As described above, since the starter generator 23 is prohibited from being started and the starter 49 is started based on the elapsed time of the engine stop state and the outside air temperature, it is possible to prevent an excessive burden from being generated on the bearing 35 of the crank journal. Therefore, in addition to the embodiment shown in FIG. 5, the bearing load of the crank journal can be further reduced. Therefore, it is possible to effectively improve the durability and cost of the bearing 35 of the crank journal.
Note that only one of the determination based on the elapsed time of the engine stop state and the determination based on the outside air temperature may be performed.

  According to at least one embodiment of the present invention, in a vehicle engine equipped with a starter generator, the load on the crank journal bearing generated when the engine is started using the starter generator is reduced, and the crank journal bearing is reduced. Therefore, it is possible to improve the durability and reduce the cost of the vehicle, which is suitable for use in a starter for a vehicle engine.

DESCRIPTION OF SYMBOLS 1 Vehicle engine starter 3 Engine 15 Crankshaft 17 Crank pulley 19 Outer groove 21 Inner groove 23 Starter generator 23a Starter generator pulley 29 First belt 25 Water pump 25a Water pump pulley (auxiliary pulley)
25b Water pump clutch (auxiliary clutch)
27 Air conditioner compressor 27a Air conditioner compressor pulley (auxiliary pulley)
27b Compressor clutch (auxiliary clutch)
31 Second belt 33 Control device 35 Bearing 37 Oil temperature sensor (oil temperature detecting means)
39 Rotational Speed Sensor 41 Outside Air Temperature Sensor 43 Ignition Switch 45 Clutch Control Unit 47 Engine Start Control Unit (Start Control Device)
49 Starter K Reference line

Claims (7)

A crank pulley mounted on a crankshaft end of a vehicle engine, a starter generator pulley mounted on a starter generator fixed to the engine body, and a first pulley wound between the crank pulley and the starter generator pulley. A vehicle engine starter comprising: 1 belt; an accessory pulley mounted on an accessory fixed to the engine body; and a second belt wound between the crank pulley and the accessory pulley. Because
The starter generator is disposed on one side with respect to a reference line in a direction perpendicular to the crankshaft as viewed from the crankshaft direction, and the auxiliary machine is disposed on the other side,
An engine starter for a vehicle, comprising: a clutch control unit that controls connection of an accessory clutch that connects and disconnects the accessory and the accessory pulley when the engine is started by the starter generator.   Oil temperature detecting means for detecting oil temperature of lubricating oil to a bearing of a crank journal that rotationally supports the crankshaft is provided, and the clutch control unit is configured to detect the auxiliary clutch based on a detection value from the oil temperature detecting means. The vehicle engine starter according to claim 1, wherein the intermittent operation is controlled.   The clutch control unit disconnects the auxiliary machine clutch when the detected value from the oil temperature detecting means exceeds a predetermined temperature, and connects the auxiliary clutch when the detected value is lower than the predetermined temperature. The starting device for a vehicle engine according to claim 1 or 2, characterized in that   The engine includes a starter for starting the engine separately from the starter generator, and when the duration of the engine stop state is a predetermined time or more, the starter generator is prohibited from starting the engine and the starter The start device for a vehicle engine according to any one of claims 1 to 3, further comprising a start control device for starting the engine.   The engine includes a starter for starting the engine separately from the starter generator. When the atmospheric temperature is equal to or lower than a predetermined temperature, the starter generator is prohibited from starting and the starter is used to start the engine. The start device for a vehicle engine according to any one of claims 1 to 3, further comprising a start control device.   2. The start of a vehicle engine according to claim 1, wherein the reference line is a cylinder center line in the case of an in-line engine and a center line between banks of the V-type engine in the case of a V-type engine. apparatus.   7. The crank pulley has a two-stage structure in a crankshaft direction, wherein the first belt is wound on the engine side and the second belt is wound on the side away from the engine. The starter for a vehicle engine according to any one of the above.

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