JP7257243B2 - Outboard motor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor, and more particularly to an outboard motor that cools an engine with cooling water pumped up from a water intake.

Conventionally, in an outboard motor, the engine is cooled by pumping up cooling water from a water intake provided in a submerged portion of the outboard motor and supplying it to a water jacket formed around the cylinder block of the engine. is common.

For example, Patent Document 1 discloses an outboard engine in which cooling water pumped up from a water intake by a water pump flows into a water jacket to cool the engine, and is discharged from the lower end of a cylinder block into an undercover through a drainage channel. machine is disclosed.

Japanese Patent Application Laid-Open No. 2002-054438

However, in the outboard motor of Patent Document 1, the water pump is driven by the drive shaft that is directly connected to the crankshaft. The water pump is also driven to draw cooling water from the water intake. Therefore, even when the temperature of the engine is low, the cooling water pumped up from the water intake is supplied to the water jacket. As a result, when the temperature of the engine is low, there is a risk that the engine will be overcooled, and it is difficult to warm up the engine early.

SUMMARY OF THE INVENTION The present invention provides an outboard motor capable of preventing overcooling of the engine and early warming up of the engine.

A first aspect of the present invention is
a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The drainage channel is provided with a water test hole for detecting whether the cooling water is supplied to the water jacket,
The information acquisition unit has a cooling water temperature acquisition unit that acquires a cooling water temperature of the cooling water that has passed through the water jacket,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit,
When it is detected that the cooling water is being supplied to the water jacket by the water test hole,
The control unit
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water temperature is less than a preset lower limit temperature;
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the cooling water temperature is equal to or higher than a preset set temperature, the bypass flow control mechanism is operated so that the flow rate of the cooling water flowing through the drain port increases. If the temperature is lower than the set temperature, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing through the drain port is reduced.
A second aspect of the present invention is
a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The information acquisition unit has a cooling water temperature acquisition unit that acquires the cooling water temperature of the cooling water that has passed through the water jacket, and an engine speed acquisition unit that acquires the engine speed of the engine,
Based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit and the engine speed acquired by the engine speed acquisition unit of the information acquisition unit, Controls the drive of the bypass flow control mechanism,
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water temperature is less than a preset lower limit temperature;
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the engine speed is increasing, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing through the drain port increases, When the engine speed is decreasing, the bypass flow control mechanism is controlled so that the flow rate of the cooling water flowing through the drain port becomes small.
A third aspect of the present invention is
a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The information acquisition unit includes a cooling water temperature acquisition unit that acquires the cooling water temperature of the cooling water that has passed through the water jacket, and a cooling water pressure acquisition unit that acquires the cooling water pressure of the cooling water that has passed through the water jacket. and
The control unit, based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit and the cooling water pressure acquired by the cooling water pressure acquisition unit of the information acquisition unit, Controls the drive of the bypass flow control mechanism.
A fourth aspect of the present invention is
a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
A thermostat valve is provided in the outlet passage,
The information acquisition unit has a cooling water pressure acquisition unit that acquires the cooling water pressure of the cooling water that has passed through the water jacket,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water pressure acquired by the cooling water pressure acquisition unit of the information acquisition unit,
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water pressure is less than a preset lower limit pressure;
If the cooling water pressure is equal to or higher than the lower limit pressure, and if the cooling water pressure is equal to or higher than a preset set pressure, the bypass flow rate adjustment mechanism is operated so that the flow rate of the cooling water flowing through the drain port increases. When the pressure is less than the set pressure, the bypass flow control mechanism is controlled so that the flow rate of the cooling water flowing through the drain port becomes small.
A fifth aspect of the present invention is
a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit,
A first throttle mechanism that throttles the flow rate of the cooling water is provided in the bypass passage,
The first throttle mechanism is arranged in the vicinity of a junction of the bypass passage and the water intake passage.

According to the present invention, since the cooling water heated by cooling the engine can be supplied again to the water jacket from the bypass, overcooling of the engine can be prevented and the engine can be warmed up early.

1 is a schematic external view of an outboard motor according to a first embodiment of the invention; FIG. FIG. 2 is an elevational view of the main parts of the outboard motor shown in FIG. 1 with a part cut away; 2 is a block diagram showing a schematic configuration of drive control of an electromagnetic valve of the outboard motor according to the first embodiment of the invention; FIG. 4 is a flow chart showing drive control of the electromagnetic valve of the outboard motor according to the first embodiment of the present invention; 5 is a graph showing the cooling water flow rate and valve opening with respect to the cooling water temperature of the outboard motor according to the first embodiment of the present invention; FIG. 7 is a block diagram showing a schematic configuration of drive control of an electromagnetic valve of an outboard motor according to a second embodiment of the present invention; 8 is a flow chart showing drive control of the electromagnetic valve of the outboard motor according to the second embodiment of the present invention. 8 is a graph showing the cooling water flow rate and valve opening with respect to the engine speed of the outboard motor according to the second embodiment of the present invention; FIG. 10 is a block diagram showing a schematic configuration of drive control of an electromagnetic valve of an outboard motor according to a third embodiment of the present invention; 8 is a flow chart showing drive control of an electromagnetic valve of an outboard motor according to a third embodiment of the present invention; 8 is a graph showing the cooling water flow rate and valve opening with respect to the cooling water pressure of the outboard motor according to the third embodiment of the present invention; FIG. 11 is a block diagram showing a schematic configuration of drive control of an electromagnetic valve of an outboard motor according to a fourth embodiment of the present invention; FIG. 11 is a flow chart showing drive control of an electromagnetic valve of an outboard motor according to a fourth embodiment of the present invention; FIG. FIG. 11 is a graph showing the cooling water flow rate and valve opening with respect to the cooling water pressure of the outboard motor according to the fourth embodiment of the present invention; FIG.

Each embodiment of the outboard motor of the present invention will be described below with reference to the accompanying drawings.

[First embodiment]
First, an outboard motor 1 according to a first embodiment of the invention will be described with reference to FIGS. 1 to 3C.

<Outboard motor structure>
As shown in FIG. 1, an outboard motor 1 of this embodiment includes an engine cover 3 covering the upper portion of an engine 2, an undercover 5 including an engine mount 4, a reduction gear, a clutch, a forward/reverse switching device, and the like. A gear case 8 that houses the mission device 6 and supports a propeller 7 for propulsion, an extension case 9 that connects the undercover 5 and the gear case 8, and the outboard motor 1 are attached to the stern plate of the hull. (shown) and a vise stern bracket 10 for fixing to the stern bracket. An air intake duct 11 is opened in the engine cover 3 .

Between the undercover 5 and the extension case 9, upper and lower ends of a swivel shaft 14 rotatably supported by a pipe-shaped swivel case 13 to which a stern bracket 10 is connected via a tilt shaft 12 are connected. there is By operating a steering arm 15 fixed to the swivel shaft 14, the angle of the outboard motor 1 with respect to the hull can be changed to give the hull a turning motion. The swivel shaft 14 is hollow, and a rod 16 for switching the transmission device 6 between forward and backward movement is inserted through the center thereof.

The engine 2 mounted on the outboard motor 1 includes a cylinder block 19 integrally comprising a cylinder 17 and a crankcase 18, a crankshaft 20 vertically supported by the cylinder block 19, and pistons of the cylinder block 19 at top dead center. It is a four-cycle vertical crankshaft engine comprising a cylinder head 21 that is joined to a side end face to form a combustion chamber and a valve gear chamber, and a head cover 23 that closes the valve gear chamber in which a camshaft 22 is supported.

The crankshaft 20 has its lower end supported by a lower bearing wall integral with the cylinder block 19 and its upper end supported by an upper bearing provided on an upper cover 24 joined to the upper wall of the cylinder block 19 . A flywheel 25 and a recoil starter 26 are connected to the upper end of the crankshaft 20, and a drive shaft 27 that transmits power to the propeller 7 is connected to the lower end thereof. A belt/pulley mechanism 28 intervenes between the crankshaft 20 and the camshaft 22 .

As shown in FIG. 2 , the cylinder block 19 of the engine 2 has a water jacket 29 surrounding two horizontally extending cylinders 17 arranged vertically and connected to an exhaust port provided in the cylinder head 21 . an exhaust passage 30, an exhaust cooling passage 31 through which cooling water passes in the vicinity of the exhaust passage 30, and a breather passage for connecting the crankcase 18 and the cylinder head 21 to each other in order to reduce fluctuations in the crankcase internal pressure. 32, a suction oil passage 33 to a lubricating oil pump connected to the lower end of the camshaft 22, a discharge oil passage 34 from the lubricating oil pump, and a lubricating oil return passage 35 from the cylinder head 21 are formed respectively. It is

An engine mount 4 provided on the undercover 5 and an oil case 37 are joined to the lower surface of the cylinder block 19 to store lubricating oil. A cooling water supply passage 38 and an exhaust passage 39 are integrally formed in a part of the oil case 37 . The cooling water supply passage 38 is connected to a water supply passage 42 having a water pump 40 driven by a drive shaft 27 directly connected to the crankshaft 20 at its lower end. The water pump 40 is connected to a water intake channel 41 having a water intake port 41A opening at the top of the gear case 8 at its lower end (see FIG. 1). A cooling water supply passage 38 on the oil case 37 side communicates with a cooling water supply passage 46 on the cylinder block 19 side through an opening 45 of a gasket 44 interposed between the cylinder block 19 and the oil case 37 . ing.

An exhaust passage 30 formed in the cylinder block 19 is connected to an exhaust passage 39 formed in the oil case 37 , and the exhaust gas after combustion passes through the extension case 9 and enters the propeller boss 47 . It is exhausted into the water from the exhaust port 48 .

<Cooling water route>
While the outboard motor 1 is sailing, the cooling water pumped up by the water pump 40 from the submerged water intake 41A flows from the water supply passage 42 extending into the extension case 9 through the water intake passage 41 to the lower part of the cylinder block 19. The water flows into the water jacket 29 around the cylinder through the inlet passages 49a and 49b provided inside and the connecting passage 50 provided inside the cylinder head 21 . Then, the cooling water flows upward through the water jacket 29 and flows out from an outlet passage 51 formed on the upper left side of the cylinder block 19 in FIG. A thermostat valve 52 is provided in the outlet passage 51, and when the cooling water in the water jacket 29 reaches a predetermined temperature, the thermostat valve 52 opens, and the cooling water flows into the side machined surface 53 of the cylinder block 19 and the Through a water jacket cover 54 joined thereto and a drainage channel 56 provided in a thermostat cover 55 covering the thermostat valve 52, the water in the cylinder block 19 is discharged from a drainage port 57 provided at the downstream end of the drainage channel 56. It is discharged inside the undercover 5 through a drainage path (not shown). Similarly, the cooling water that has flowed through the exhaust cooling passage 31 near the exhaust passage 30 also passes through a drainage passage (not shown) between the side machined surface 53 of the cylinder block 19 and the water jacket cover 54 to the under cover. 5 inside.

A water test hole 43 is provided in the drainage channel 56 . By providing the water test hole 43 in the drainage path 56 through which the cooling water that has passed through the water jacket 29 flows, it is possible to more reliably detect whether or not the cooling water is being supplied to the water jacket 29 .

A bypass 60 that branches off from the drainage channel 56 and circulates the cooling water to the water intake channel 41 is provided in the vicinity of the drainage port 57 of the drainage channel 56 . Therefore, the cooling water flowing through the drainage channel 56 is either discharged inside the undercover 5 from the drainage port 57 or circulated from the bypass channel 60 to the water intake channel 41 and supplied to the water jacket 29 again. split up.

Therefore, at least part of the cooling water heated by cooling the engine 2 circulates from the bypass passage 60 to the water intake passage 41 and is supplied to the water jacket 29 again.

In the outboard motor 1, the temperature of the engine 2 is low, for example, when the engine 2 is started or during low-speed trolling. Even in such a case, the water pump 40 is driven by the drive shaft 27 directly connected to the crankshaft 20, so when the engine 2 is driven, the water pump 40 is also driven to pump up cooling water from the water intake 41A. Therefore, cooling water is supplied to the water jacket 29 even when the temperature of the engine 2 is low. In this embodiment, in such a case, the cooling water heated by cooling the engine 2 can be circulated from the bypass passage 60 to the water intake passage 41 and supplied to the water jacket 29 again. Since the cooling water having a higher temperature than the cooling water alone can be supplied to the water jacket 29, overcooling of the engine 2 can be prevented and the engine 2 can be warmed up early.

In the outboard motor 1, a first orifice 71 for restricting the flow rate of cooling water is provided in the bypass passage 60, and a second orifice 72 for restricting the flow rate of cooling water is provided in the drainage passage 56. A valve 73 is provided near the drain port 57 of the drain channel 56 and at the branching portion between the drain channel 56 and the bypass channel 60 .

The first orifice 71 is arranged near the junction of the bypass 60 and the intake channel 41 . The water pump 40 not only pumps up the cooling water from the intake channel 41 but also sucks the cooling water from the bypass channel 60 by the suction force of the pump. Therefore, due to fluctuations in the suction force of the water pump 40, the flow rate of the cooling water flowing through the bypass passage 60 also fluctuates. However, in the present embodiment, since the first orifice 71 is arranged near the junction of the bypass passage 60 and the water intake passage 41 , the cooling water flowing through the bypass passage 60 due to fluctuations in the suction force of the water pump 40 Fluctuations in the flow rate can be reduced. By using the first orifice 71 having an appropriate flow path diameter, the flow rate of the cooling water can be throttled and an appropriate amount of cooling water can be supplied to the water intake path 41. Therefore, an appropriate temperature according to the state of the engine 2 can be obtained. Cooling water can be supplied to the water jacket 29 . In addition, since the flow rate of the cooling water is throttled by the orifice, the amount of the cooling water can be adjusted accurately with a simple structure.

The second orifice 72 is located near the outlet passage 51 of the drainage channel 56 . When the cooling water in the water jacket 29 reaches a predetermined temperature, the thermostat valve 52 opens and the cooling water is discharged to the drainage path 56. Therefore, the cooling water flows through the drainage path 56 before and after the thermostat valve 52 is opened and closed. The flow rate of cooling water fluctuates greatly. However, in this embodiment, since the second orifice 72 is arranged near the outlet passage 51 of the drainage channel 56, the opening and closing of the thermostat valve 52 reduces the fluctuation of the flow rate of the cooling water flowing through the drainage channel 56. Therefore, fluctuations in the flow rate of cooling water flowing through the bypass 60 can also be reduced. By using the second orifice 72 having an appropriate flow path diameter, the flow rate of the cooling water can be throttled and an appropriate amount of cooling water can be supplied to the water intake path 41 via the drainage path 56 and the bypass path 60. It is possible to supply the water jacket 29 with cooling water having an appropriate temperature according to the state of the engine 2 . In addition, since the flow rate of the cooling water is throttled by the orifice, the amount of the cooling water can be adjusted accurately with a simple structure.

The electromagnetic valve 73 is provided at the branch of the drainage channel 56 and the bypass channel 60. When the electromagnetic valve 73 is closed, the cooling water does not flow to the drainage port 57, and all the cooling water flows to the bypass channel 60. and flow. On the other hand, when the electromagnetic valve 73 is open, a part of the cooling water flows to the bypass passage 60, and the rest of the cooling water flows to the drain port 57 via the electromagnetic valve 73, and from the drain port 57 to the undercover 5. discharged inside. The electromagnetic valve 73 changes the ratio between the flow rate of cooling water flowing to the bypass passage 60 and the flow rate of cooling water flowing to the drain port 57 depending on the valve opening degree. The ratio of the flow rate of cooling water flowing to 57 is increased.

As shown in FIG. 3A , the outboard motor 1 includes a valve control section 74 that controls driving of the electromagnetic valve 73 and an information acquisition section 80 that acquires information on the state of the outboard motor 1 . The valve control unit 74 controls the driving of the electromagnetic valve 73 based on the information acquired by the information acquisition unit 80 and adjusts the valve opening degree of the electromagnetic valve 73 . Based on the information acquired by the information acquisition unit 80, the valve control unit 74 adjusts the valve opening degree of the electromagnetic valve 73, thereby controlling the flow rate of the cooling water flowing through the bypass passage 60 and the flow rate of the cooling water flowing through the drain port 57. is adjusted, it is possible to supply the water jacket 29 with cooling water having an appropriate temperature according to the state of the engine 2 .

The information acquisition section 80 has a cooling water temperature acquisition section 81 . A temperature sensor 91 provided in the drainage channel 56 is connected to the cooling water temperature acquisition unit 81 . The cooling water temperature acquiring unit 81 acquires the cooling water temperature T of the cooling water passing through the water jacket 29 by detecting the cooling water temperature of the cooling water passing through the drainage channel 56 with the temperature sensor 91 .

<Solenoid valve control>
As shown in FIGS. 3B and 3C, first, in step S110, the valve control unit 74 compares the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 with a preset minimum temperature Tmin.

If the cooling water temperature T is lower than the lower limit temperature Tmin in step S110, the valve control unit 74 controls the electromagnetic valve 73 so that the electromagnetic valve 73 is fully closed, and returns to step S110. Therefore, when the cooling water temperature T is lower than the lower limit temperature Tmin, the electromagnetic valve 73 is fully closed, and the cooling water is prohibited from flowing to the drain port 57 . As a result, all of the cooling water heated by cooling the engine 2 is supplied again from the bypass passage 60 to the water jacket 29, and the cooling water having a higher temperature can be supplied to the water jacket 29, so that the engine 2 can be more effectively operated. can be prevented from overcooling, and the engine 2 can be warmed up earlier.

If the cooling water temperature T is equal to or higher than the lower limit temperature Tmin in step S110, the valve control unit 74 proceeds to the next step S120.

In step S120, the valve control unit 74 compares the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 with the preset set temperature Tset. The set temperature Tset is higher than the lower limit temperature Tmin.

In step S120, when the cooling water temperature T is equal to or higher than the set temperature Tset, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is increased, and the process returns to step S110. Therefore, when the cooling water temperature T is equal to or higher than the set temperature Tset, the opening degree of the electromagnetic valve 73 increases, and the flow rate of the cooling water flowing through the drain port 57 increases. As a result, when the cooling water temperature T is high, a large amount of cooling water is discharged from the drain port 57, and the ratio of the cooling water supplied to the water jacket 29 again from the bypass passage 60 decreases. The temperature of the cooling water supplied is almost the same as that of the cooling water pumped up from the water intake port 41A, so that the engine 2 can be cooled more effectively.

If the cooling water temperature T is less than the set temperature Tset in step S120, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is decreased, and the process returns to step S110. Therefore, when the cooling water temperature T is lower than the set temperature Tset, the opening degree of the electromagnetic valve 73 is reduced and the flow rate of the cooling water flowing through the drain port 57 is reduced. The ratio of the flow rate of the cooling water to be used increases. As a result, when the cooling water temperature T is low, a larger amount of the cooling water heated by cooling the engine 2 is supplied from the bypass passage 60 to the water jacket 29 again. , cooling water having an appropriate temperature can be supplied to the water jacket 29 according to the state of the engine 2 .

In this manner, the valve control section 74 controls driving of the electromagnetic valve 73 based on the coolant temperature T acquired by the coolant temperature acquisition section 81 . As a result, the flow rate of the cooling water flowing through the bypass passage 60 and the flow rate of the cooling water flowing through the drain port 57 can be adjusted according to the cooling water temperature T, so that the cooling water at a more appropriate temperature is supplied to the water jacket 29. can.

[Second embodiment]
Next, an outboard motor 1 according to a second embodiment of the invention will be described with reference to FIGS. 4A to 4C. In the following description, the same components as those of the outboard motor 1 of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted or simplified. In the outboard motor 1 of the first embodiment, the information acquisition section 80 includes the cooling water temperature acquisition section 81. In the outboard motor 1 of the second embodiment, the information acquisition section 80 includes the cooling water temperature It has an acquisition unit 81 and an engine speed acquisition unit 82 that acquires the engine speed of the engine 2 . Differences between the outboard motor 1 of the first embodiment and the outboard motor 1 of the second embodiment will be described in detail below.

As shown in FIG. 4A , the information acquisition section 80 has a cooling water temperature acquisition section 81 and an engine speed acquisition section 82 .

A temperature sensor 91 provided in the drainage channel 56 is connected to the cooling water temperature acquisition unit 81 . The cooling water temperature acquiring unit 81 acquires the cooling water temperature T of the cooling water passing through the water jacket 29 by detecting the cooling water temperature of the cooling water passing through the drainage channel 56 with the temperature sensor 91 .

A crank angle sensor 92 that detects the reference position and rotation angle of the crankshaft 20 of the engine 2 and the rotation speed of the engine 2 is connected to the engine speed acquisition unit 82 . Then, the engine speed acquisition unit 82 acquires the engine speed Ne of the engine 2 detected by the crank angle sensor 92 .

<Solenoid valve control>
As shown in FIGS. 4B and 4C, first, in step S210, the valve control unit 74 compares the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 with a preset minimum temperature Tmin.

In step S210, if the cooling water temperature T is lower than the lower limit temperature Tmin, the valve control unit 74 controls the electromagnetic valve 73 so that the electromagnetic valve 73 is fully closed, and returns to step S210. Therefore, when the cooling water temperature T is lower than the lower limit temperature Tmin, the electromagnetic valve 73 is fully closed, and the cooling water is prohibited from flowing to the drain port 57 . As a result, all of the cooling water heated by cooling the engine 2 is supplied again from the bypass passage 60 to the water jacket 29, and the cooling water having a higher temperature can be supplied to the water jacket 29, so that the engine 2 can be more effectively operated. can be prevented from overcooling, and the engine 2 can be warmed up earlier.

If the cooling water temperature T is equal to or higher than the lower limit temperature Tmin in step S210, the valve control unit 74 proceeds to the next step S220.

In step S220, the valve control unit 74 determines whether the engine speed Ne acquired by the engine speed acquiring unit 82 is increasing or decreasing.

In step S220, if the engine speed Ne is increasing, the valve control unit 74 controls the electromagnetic valve 73 so that the opening degree of the electromagnetic valve 73 increases, and the process returns to step S210. Therefore, when the engine speed Ne is increasing, the opening degree of the electromagnetic valve 73 is increased, and the flow rate of the cooling water flowing through the drain port is increased. As a result, when the engine speed Ne is increasing, a large amount of cooling water is discharged from the drain port 57, and the ratio of the cooling water supplied to the water jacket 29 again from the bypass passage 60 decreases. The temperature of the cooling water supplied to the jacket 29 is almost the same as that of the cooling water pumped up from the water intake port 41A, so that the engine 2 can be cooled more effectively.

In step S220, the valve control unit 74 controls the electromagnetic valve 73 so that the opening degree of the electromagnetic valve 73 is decreased when the engine speed Ne is decreasing, and the process returns to step S210. Therefore, when the engine speed Ne decreases, the opening degree of the electromagnetic valve 73 decreases and the flow rate of the cooling water flowing through the drain port 57 decreases, so that the cooling water is supplied from the bypass passage 60 to the water jacket 29 again. The ratio of cooling water flow rate is increased. As a result, when the engine speed Ne is decreasing, a larger amount of the cooling water heated by cooling the engine 2 is supplied again from the bypass passage 60 to the water jacket 29, and the cooling water with a higher temperature is supplied. Since cooling water can be supplied to the water jacket 29 , it is possible to supply cooling water having an appropriate temperature to the water jacket 29 according to the state of the engine 2 .

Therefore, the higher the engine speed Ne, the lower the temperature of cooling water that can be supplied to the water jacket 29, and the more effectively the engine 2 can be cooled.

In this way, the valve control unit 74 drives the electromagnetic valve 73 based on the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 and the engine speed Ne acquired by the engine speed acquisition unit 82. Control. As a result, the flow rate of the cooling water flowing through the bypass passage 60 and the flow rate of the cooling water flowing through the drain port 57 can be adjusted according to the cooling water temperature T and the engine speed Ne. A water jacket 29 can be supplied.

[Third embodiment]
Next, an outboard motor 1 according to a third embodiment of the invention will be described with reference to FIGS. 5A to 5C. In the following description, the same components as those of the outboard motor 1 of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted or simplified. In the outboard motor 1 of the first embodiment, the information acquisition section 80 includes the cooling water temperature acquisition section 81. In the outboard motor 1 of the third embodiment, the information acquisition section 80 includes the cooling water temperature It has an acquisition unit 81 and a cooling water pressure acquisition unit 83 that acquires the cooling water pressure of the cooling water that has passed through the water jacket 29 . Differences between the outboard motor 1 of the first embodiment and the outboard motor 1 of the third embodiment will be described in detail below.

As shown in FIG. 5A , the information acquisition section 80 has a coolant temperature acquisition section 81 and a coolant pressure acquisition section 83 .

A temperature sensor 91 provided in the drainage channel 56 is connected to the cooling water temperature acquisition unit 81 . The cooling water temperature acquiring unit 81 acquires the cooling water temperature T of the cooling water passing through the water jacket 29 by detecting the cooling water temperature of the cooling water passing through the drainage channel 56 with the temperature sensor 91 .

A pressure sensor 93 provided in the drainage channel 56 is connected to the cooling water pressure acquisition unit 83 . The cooling water pressure acquisition unit 83 acquires the cooling water pressure P of the cooling water passing through the water jacket 29 by detecting the cooling water pressure of the cooling water passing through the drainage channel 56 with the pressure sensor 93 .

<Solenoid valve control>
As shown in FIGS. 5B and 5C, first, in step S310, the valve control unit 74 compares the cooling water temperature T acquired by the cooling water temperature acquiring unit 81 with a preset minimum temperature Tmin.

If the cooling water temperature T is lower than the lower limit temperature Tmin in step S310, the valve control unit 74 controls the electromagnetic valve 73 so that the electromagnetic valve 73 is fully closed, and returns to step S310. Therefore, when the cooling water temperature T is lower than the lower limit temperature Tmin, the electromagnetic valve 73 is fully closed, and the cooling water is prohibited from flowing to the drain port 57 . As a result, all of the cooling water heated by cooling the engine 2 is supplied again from the bypass passage 60 to the water jacket 29, and the cooling water having a higher temperature can be supplied to the water jacket 29, so that the engine 2 can be more effectively operated. can be prevented from overcooling, and the engine 2 can be warmed up earlier.

If the cooling water temperature T is equal to or higher than the lower limit temperature Tmin in step S310, the valve control unit 74 proceeds to the next step S320.

In step S320, the valve control unit 74 compares the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 with a preset set temperature Tset. The set temperature Tset is higher than the lower limit temperature Tmin.

If the cooling water temperature T is less than the set temperature Tset in step S320, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is decreased, and the process returns to step S310. Therefore, when the cooling water temperature T is lower than the set temperature Tset, the opening degree of the electromagnetic valve 73 is reduced and the flow rate of the cooling water flowing through the drain port 57 is reduced. The ratio of the flow rate of the cooling water to be used increases. As a result, when the cooling water temperature T is low, a larger amount of the cooling water heated by cooling the engine 2 is supplied from the bypass passage 60 to the water jacket 29 again. , the overcooling of the engine 2 can be prevented.

If the cooling water temperature T is equal to or higher than the set temperature Tset in step S320, the valve control unit 74 proceeds to the next step S330.

In step S330, the valve control unit 74 compares the cooling water pressure P acquired by the cooling water pressure acquisition unit 83 with a preset set pressure Pset.

If the cooling water pressure P is less than the set pressure Pset in step S330, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is decreased, and the process returns to step S310. Therefore, when the cooling water pressure P is less than the set pressure Pset, the opening degree of the electromagnetic valve 73 becomes small, and the flow rate of the cooling water flowing through the drain port 57 becomes small. The ratio of the flow rate of the cooling water to be used increases. As a result, when the cooling water pressure P is low, a larger amount of the cooling water heated by cooling the engine 2 is supplied from the bypass passage 60 to the water jacket 29 again. , cooling water having an appropriate temperature can be supplied to the water jacket 29 according to the state of the engine 2 .

In step S330, when the cooling water pressure P is equal to or higher than the set pressure Pset, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is increased, and the process returns to step S310. Therefore, when the cooling water pressure P is equal to or higher than the set pressure Pset, the degree of opening of the electromagnetic valve 73 increases, and the flow rate of the cooling water flowing through the drain port 57 increases. As a result, when the cooling water pressure P is high, a large amount of the cooling water is discharged from the drain port 57, and the ratio of the cooling water supplied to the water jacket 29 again from the bypass passage 60 decreases. The temperature of the cooling water supplied is almost the same as that of the cooling water pumped up from the water intake port 41A, so that the engine 2 can be cooled more effectively.

Therefore, the higher the coolant pressure P, the lower the temperature of the coolant that can be supplied to the water jacket 29, and the more effectively the engine 2 can be cooled.

In this way, the valve control unit 74 drives the electromagnetic valve 73 based on the cooling water temperature T acquired by the cooling water temperature acquisition unit 81 and the cooling water pressure P acquired by the cooling water pressure acquisition unit 83. Control. As a result, the flow rate of the cooling water flowing through the bypass passage 60 and the flow rate of the cooling water flowing through the drain port 57 can be adjusted according to the cooling water temperature T and the cooling water pressure P, so cooling water at a more appropriate temperature can be obtained. A water jacket 29 can be supplied.

[Fourth embodiment]
Next, an outboard motor 1 according to a fourth embodiment of the invention will be described with reference to FIGS. 6A to 6C. In the following description, the same components as those of the outboard motor 1 of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted or simplified. In the outboard motor 1 of the first embodiment, the information acquisition section 80 includes the cooling water temperature acquisition section 81. In the outboard motor 1 of the third embodiment, the information acquisition section 80 includes the water jacket 29. It has a cooling water pressure acquisition unit 83 that acquires the cooling water pressure of the cooling water that has passed through. Differences between the outboard motor 1 of the first embodiment and the outboard motor 1 of the third embodiment will be described in detail below.

As shown in FIG. 6A , the information acquisition section 80 has a cooling water pressure acquisition section 83 .

A pressure sensor 93 provided in the drainage channel 56 is connected to the cooling water pressure acquisition unit 83 . The cooling water pressure acquisition unit 83 acquires the cooling water pressure P of the cooling water passing through the water jacket 29 by detecting the cooling water pressure of the cooling water passing through the drainage channel 56 with the pressure sensor 93 .

Since the outlet passage 51 is provided with a thermostat valve 52 , when the temperature of the cooling water that has passed through the water jacket 29 does not reach a predetermined temperature, the thermostat valve 52 is not open, so that the cooling water passes through the water jacket 29 . Cooling water is not discharged to the drainage channel 56 . Therefore, even if the engine 2 is running, if the temperature of the cooling water that has passed through the water jacket 29 does not reach a predetermined temperature, the cooling water will stay in the water jacket 29, so the temperature of the cooling water will be higher than that of the engine. 2 is driven to gradually increase. Accordingly, by appropriately setting the temperature at which the thermostat valve 52 opens, overcooling of the engine 2 can be prevented and the engine 2 can be warmed up more quickly.

The valve control unit 74 drives and controls the electromagnetic valve 73 when the temperature of the cooling water that has passed through the water jacket 29 reaches a predetermined temperature and the thermostat valve 52 is opened to discharge the cooling water to the drainage path 56 . .

<Solenoid valve control>
As shown in FIGS. 6B and 6C, the valve control unit 74 first compares the cooling water pressure P acquired by the cooling water pressure acquiring unit 83 with a preset lower limit pressure Pmin in step S410.

In step S410, if the cooling water pressure P is less than the lower limit pressure Pmin, the valve control unit 74 controls the electromagnetic valve 73 so that the electromagnetic valve 73 is fully closed, and returns to step S310. Therefore, when the cooling water pressure P is less than the lower limit pressure Pmin, the electromagnetic valve 73 is fully closed and the cooling water is prohibited from flowing to the drain port 57 . As a result, all of the cooling water heated by cooling the engine 2 is supplied again from the bypass passage 60 to the water jacket 29, and the cooling water having a higher temperature can be supplied to the water jacket 29, so that the engine 2 can be more effectively operated. can be prevented from overcooling, and the engine 2 can be warmed up earlier.

If the cooling water pressure P is equal to or higher than the lower limit pressure Pmin in step S410, the valve control unit 74 proceeds to the next step S420.

In step S420, the valve control unit 74 compares the cooling water pressure P acquired by the cooling water pressure acquisition unit 83 with the preset set pressure Pset. The set pressure Pset is higher than the lower limit pressure Pmin.

If the cooling water pressure P is less than the set pressure Pset in step S420, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is decreased, and the process returns to step S410. Therefore, when the cooling water pressure P is less than the set pressure Pset, the opening degree of the electromagnetic valve 73 becomes small, and the flow rate of the cooling water flowing through the drain port 57 becomes small. The ratio of the flow rate of the cooling water to be used increases. As a result, when the cooling water pressure P is low, a larger amount of the cooling water heated by cooling the engine 2 is supplied from the bypass passage 60 to the water jacket 29 again. , the overcooling of the engine 2 can be prevented.

In step S420, when the cooling water pressure P is equal to or higher than the set pressure Pset, the valve control unit 74 controls the electromagnetic valve 73 so that the valve opening degree of the electromagnetic valve 73 is increased, and the process returns to step S410. Therefore, when the cooling water pressure P is equal to or higher than the set pressure Pset, the degree of opening of the electromagnetic valve 73 increases, and the flow rate of the cooling water flowing through the drain port 57 increases. As a result, when the cooling water pressure P is high, a large amount of the cooling water is discharged from the drain port 57, and the ratio of the cooling water supplied to the water jacket 29 again from the bypass passage 60 decreases. The temperature of the cooling water supplied is almost the same as that of the cooling water pumped up from the water intake port 41A, so that the engine 2 can be cooled more effectively.

Therefore, the higher the coolant pressure P, the lower the temperature of the coolant that can be supplied to the water jacket 29, and the more effectively the engine 2 can be cooled.

Thus, the valve control unit 74 controls driving of the electromagnetic valve 73 based on the cooling water pressure P acquired by the cooling water pressure acquisition unit 83 . As a result, the flow rate of the cooling water flowing through the bypass passage 60 and the flow rate of the cooling water flowing through the drain port 57 can be adjusted according to the cooling water pressure P, so that the cooling water at a more appropriate temperature is supplied to the water jacket 29. can.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified, improved, and the like as appropriate.

For example, in the outboard motors 1 of the first to fourth embodiments, the electromagnetic valve 73 is provided at the branch of the drainage channel 56 and the bypass channel 60. Any bypass flow control mechanism capable of adjusting the flow of cooling water through passage 60 and the flow of cooling water through outlet 57 may be used. The bypass flow control mechanism is preferably a valve mechanism such as a gate valve, globe valve, check valve, ball valve, butterfly valve, or the like. Also, the bypass flow rate adjustment mechanism may be driven by any drive system such as pneumatic, hydraulic, electric, or electromagnetic. From the viewpoint of miniaturization and weight reduction, the bypass flow rate adjustment mechanism is preferably electromagnetically driven.

Further, for example, the outboard motors 1 of the first to fourth embodiments have the first orifice 71 and the second orifice 72. Any throttling mechanism for throttling the flow rate of cooling water may be used, and similarly, any throttling mechanism for throttling the flow rate of cooling water, not limited to the second orifice 72, provided in the drainage channel 56 may be used. .

Further, for example, the outboard motors 1 of the first to fourth embodiments have the first orifice 71 and the second orifice 72, but the first orifice 71 and the second orifice 72 may be omitted.

Further, for example, in the outboard motors 1 of the first to third embodiments, the information acquisition unit 80 has the cooling water temperature acquisition unit 81, and the temperature sensor 91 detects the cooling water temperature of the cooling water passing through the drainage channel 56. Since the cooling water temperature T of the cooling water that has passed through the water jacket 29 can be acquired by the detection, the flow rate of the cooling water flowing through the bypass passage 60 can be adjusted according to the cooling water temperature T by the valve control unit 74 . Therefore, although the outboard motors 1 of the first to third embodiments are provided with the thermostat valve 52 in the outlet passage 51, the thermostat valve 52 may be omitted.

Further, for example, in the outboard motor 1 of the third embodiment, the information acquisition section 80 has the cooling water pressure acquisition section 83, and the pressure sensor 93 detects the cooling water pressure of the cooling water passing through the drainage passage 56. , the cooling water pressure P of the cooling water that has passed through the water jacket 29 can be acquired, so that the cooling water pressure acquisition unit 83 can detect whether or not the cooling water is being supplied to the water jacket 29 . Therefore, although the water test hole 43 is provided in the drainage channel 56 in the outboard motor 1 of the third embodiment, the water test hole 43 may be omitted.

In addition, at least the following matters are described in this specification. In addition, although the parenthesis shows the components corresponding to the above-described embodiment, the present invention is not limited to this.

(1) a water intake channel (water intake channel 41) provided with a water intake (water intake port 41A);
a water pump (water pump 40) for pumping cooling water from the water intake through the water intake channel;
an engine (engine 2) formed with a water jacket (water jacket 29) through which the cooling water passes;
a water supply passage (water supply passage 42) for supplying the cooling water from the water pump to the water jacket;
an outlet passage (outlet passage 51) through which the cooling water that has passed through the water jacket flows;
An outboard motor (outboard motor 1) comprising: a drainage channel (drainage channel 56) through which the cooling water flowing out from the outlet passage flows, and a drainage port (drainage port 57) provided at a downstream end thereof. hand,
a bypass passage (bypass passage 60) for circulating the cooling water from the drainage passage to the intake passage;
A bypass flow rate adjusting mechanism (electromagnetic valve 73) provided at a branching portion of the drainage channel and the bypass channel and adjusting a flow rate of the cooling water flowing to the bypass channel and a flow rate of the cooling water flowing to the drain port. and,
a control unit (valve control unit 74) that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit (information acquisition unit 80) for acquiring information on the state of the outboard motor,
The outboard motor, wherein the control section controls driving of the bypass flow rate adjustment mechanism based on the information acquired by the information acquisition section.

According to (1), the outboard motor has a bypass passage that circulates cooling water from the drainage passage to the water intake passage, and the cooling water that has been heated by cooling the engine can be resupplied from the bypass passage to the water jacket. Therefore, overcooling of the engine can be prevented and the engine can be warmed up early.
Further, the outboard motor controls the driving of the bypass flow rate adjustment mechanism based on the information acquired by the information acquisition unit that acquires the information on the state of the outboard motor, thereby controlling the flow rate of the cooling water flowing through the bypass passage, Since the flow rate of cooling water flowing to the drain port is adjusted, cooling water having an appropriate temperature according to the state of the engine can be supplied to the water jacket.

(2) The outboard motor according to (1),
The drainage channel is provided with a water test hole (water test hole 43) for detecting whether or not the cooling water is supplied to the water jacket,
The information acquisition unit has a cooling water temperature acquiring unit (cooling water temperature acquiring unit 81) that acquires the cooling water temperature (cooling water temperature T) of the cooling water that has passed through the water jacket,
The outboard motor, wherein the control section controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition section.

According to (2), since the water test hole is provided in the drainage channel, it is possible to more reliably detect whether cooling water is being supplied to the water jacket.
Furthermore, based on the cooling water temperature acquired by the cooling water temperature acquisition unit, the bypass flow rate adjustment mechanism is controlled to adjust the flow rate of cooling water flowing through the bypass and the flow rate of cooling water flowing through the drain port. Therefore, it is possible to supply cooling water at a more appropriate temperature to the water jacket according to the temperature of the cooling water.

(3) The outboard motor according to (2),
When it is detected that the cooling water is being supplied to the water jacket by the water test hole,
The control unit
If the cooling water temperature is less than a preset lower limit temperature (lower limit temperature Tmin), controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port;
If the cooling water temperature is equal to or higher than the lower limit temperature, if the cooling water temperature is equal to or higher than a preset set temperature (set temperature Tset), the flow rate of the cooling water flowing through the drain port is increased. An outboard motor that controls a bypass flow rate adjustment mechanism so that, when the temperature is below the set temperature, the flow rate of the cooling water flowing through the drain port is reduced.

According to (3), if the cooling water temperature is less than the preset lower limit temperature, the control unit controls the bypass flow control mechanism so as to prohibit the cooling water from flowing to the drain port. All of the cooling water that has been cooled and heated can be resupplied to the water jacket from the bypass, thereby preventing overcooling of the engine more effectively and warming up the engine more quickly.
If the cooling water temperature is above the lower limit temperature, if the cooling water temperature is above the set temperature, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing to the drain port increases. Since the bypass flow control mechanism is controlled so that the flow rate of cooling water flowing to the drain port is reduced, cooling water at a more appropriate temperature can be supplied to the water jacket according to the state of the engine.

(4) The outboard motor according to (1),
The information acquisition unit includes a cooling water temperature acquiring unit (cooling water temperature acquiring unit 81) that acquires the cooling water temperature (cooling water temperature T) of the cooling water that has passed through the water jacket, and the engine speed of the engine ( an engine speed acquisition unit (engine speed acquisition unit 82) that acquires the engine speed Ne);
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit and the engine speed acquired by the engine speed acquisition unit. Outboard motor.

According to (4), based on the cooling water temperature acquired by the cooling water temperature acquisition unit and the engine speed acquired by the engine speed acquisition unit, the bypass flow rate adjustment mechanism is controlled to operate in the bypass path. Since the flow rate of the cooling water flowing and the flow rate of the cooling water flowing to the drain port can be adjusted, cooling water having a more appropriate temperature can be supplied to the water jacket according to the cooling water temperature and the engine speed.

(5) The outboard motor according to (4),
The control unit
If the cooling water temperature is less than a preset lower limit temperature (lower limit temperature Tmin), controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port;
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the engine speed is increasing, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing through the drain port increases, The outboard motor controls the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing through the drain port is reduced when the engine speed is low.

According to (5), if the cooling water temperature is less than the preset lower limit temperature, the control unit controls the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port. All of the cooling water that has been cooled and heated can be resupplied to the water jacket from the bypass, thereby preventing overcooling of the engine more effectively and warming up the engine more quickly.
If the cooling water temperature is above the lower limit temperature and the engine speed is increasing, the bypass flow control mechanism is controlled so that the flow rate of the cooling water flowing to the drain port increases, and the engine speed decreases. If there is, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing to the drain is reduced, so the higher the engine speed, the lower the temperature of the cooling water that can be supplied to the water jacket, effectively cooling the engine. can.

(6) The outboard motor according to (1),
The information acquisition unit includes a cooling water temperature acquiring unit (cooling water temperature acquiring unit 81) that acquires the cooling water temperature (cooling water temperature T) of the cooling water that has passed through the water jacket, and the cooling water temperature acquiring unit 81 that has passed through the water jacket. a cooling water pressure acquisition unit (cooling water pressure acquisition unit 83) that acquires the cooling water pressure of the cooling water (cooling water pressure P),
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit and the cooling water pressure acquired by the cooling water pressure acquisition unit. Outboard motor.

According to (6), based on the cooling water temperature acquired by the cooling water temperature acquisition unit and the cooling water pressure acquired by the cooling water pressure acquisition unit, driving of the bypass flow rate adjustment mechanism is controlled, and the bypass path Since the flow rate of the cooling water flowing and the flow rate of the cooling water flowing to the drain port can be adjusted, cooling water at a more appropriate temperature can be supplied to the water jacket according to the cooling water temperature and cooling water pressure.

(7) The outboard motor according to (6),
The control unit
If the cooling water temperature is less than a preset lower limit temperature (lower limit temperature Tmin), controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port;
If the cooling water temperature is equal to or higher than the lower limit temperature,
when the cooling water temperature is less than a preset set temperature (set temperature Tset), controlling the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing through the drain port is reduced;
When the cooling water temperature is equal to or higher than the set temperature, if the cooling water pressure is less than a preset set pressure (set pressure Pset), the flow rate of the cooling water flowing through the drain port is reduced. An outboard motor that controls a bypass flow rate adjustment mechanism so that, if the cooling water pressure is equal to or higher than the set pressure, the bypass flow rate adjustment mechanism increases the flow rate of the cooling water flowing through the drain port.

According to (7), if the cooling water temperature is less than the preset lower limit temperature, the control unit controls the bypass flow control mechanism so as to prohibit the cooling water from flowing to the drain port. All of the cooling water that has been cooled and heated can be resupplied to the water jacket from the bypass, thereby preventing overcooling of the engine more effectively and warming up the engine more quickly.
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the cooling water temperature is lower than the set temperature, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing to the drain port becomes small. can be increased, and overcooling of the engine can be prevented. On the other hand, if the cooling water temperature is higher than the set temperature and the cooling water pressure is less than the set pressure, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing to the drain port is reduced, and the cooling water pressure is set. If the pressure is higher than the pressure, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing to the drain port increases. can be cooled.

(8) The outboard motor according to (1),
A thermostat valve (thermostat valve 52) is provided in the outlet passage,
The information acquisition unit has a cooling water pressure acquisition unit (cooling water pressure acquisition unit 83) that acquires the cooling water pressure (cooling water pressure P) of the cooling water that has passed through the water jacket,
The outboard motor, wherein the control section controls driving of the bypass flow rate adjustment mechanism based on the cooling water pressure acquired by the cooling water pressure acquisition section.

According to (8), since a thermostat valve is provided in the outlet passage, if the temperature of the cooling water that has passed through the water jacket does not reach a predetermined temperature, the cooling water will not be discharged to the drainage channel. overcooling of the engine can be prevented and the engine can be warmed up earlier. In addition, based on the cooling water pressure acquired by the cooling water pressure acquisition unit, it is possible to control the drive of the bypass flow rate adjustment mechanism and adjust the flow rate of cooling water flowing through the bypass path and the flow rate of cooling water flowing through the drain port. , cooling water at a more appropriate temperature can be supplied to the water jacket according to the cooling water pressure.

(9) The outboard motor according to (8),
The control unit
If the cooling water pressure is less than a preset lower limit pressure (lower limit pressure Pmin), controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port,
If the cooling water pressure is equal to or higher than the lower limit pressure, if the cooling water pressure is equal to or higher than a preset set pressure (set pressure Pset), the flow rate of the cooling water flowing through the drain port is increased. An outboard motor that controls a bypass flow rate adjustment mechanism, and controls the bypass flow rate adjustment mechanism so that, when the pressure is less than the set pressure, the flow rate of the cooling water flowing through the drain port is reduced.

According to (9), if the cooling water pressure is less than the lower limit pressure, the control unit controls the bypass flow control mechanism to prohibit the cooling water from flowing to the drain port. All of the warmed cooling water can be resupplied from the bypass to the water jacket, preventing overcooling of the engine more effectively and warming up the engine more quickly.
If the cooling water pressure is equal to or higher than the lower limit pressure, if the cooling water pressure is equal to or higher than the set pressure, the bypass flow control mechanism is controlled so that the flow rate of the cooling water flowing to the drain port increases. Since the bypass flow control mechanism is controlled so that the flow rate of the cooling water flowing to the drain port is reduced, cooling water at a more appropriate temperature can be supplied to the water jacket according to the cooling water pressure.

(10) The outboard motor according to any one of (1) to (9),
The outboard motor, wherein the bypass flow control mechanism is an electromagnetic valve.

According to (10), since the bypass flow control mechanism is an electromagnetic valve, it is possible to reduce the size and weight.

(11) The outboard motor according to any one of (1) to (10),
An outboard motor, wherein a first throttling mechanism (first orifice 71) for throttling a flow rate of the cooling water is provided in the bypass passage.

According to (11), since the bypass is provided with the first throttle mechanism that throttles the flow rate of the cooling water, the flow rate of the cooling water flowing through the bypass can be adjusted with a simple structure.

(12) The outboard motor according to (11),
The outboard motor, wherein the first throttle mechanism is arranged in the vicinity of a junction of the bypass passage and the water intake passage.

According to (12), since the first throttle mechanism is arranged near the confluence of the bypass passage and the water intake passage, the flow rate of the cooling water flowing through the bypass passage fluctuates due to fluctuations in the suction force of the water pump. can be reduced.

(13) The outboard motor according to (11) or (12),
The outboard motor, wherein the first throttle mechanism is an orifice.

According to (13), since the first throttle mechanism is an orifice, the flow rate of the cooling water flowing through the bypass can be adjusted accurately with a simple structure.

(14) The outboard motor according to any one of (1) to (13),
An outboard motor, wherein a second throttling mechanism (second orifice 72) for throttling the flow rate of the cooling water is provided in the drainage passage.

According to (14), since the second throttling mechanism for throttling the flow rate of the cooling water is provided in the drainage path, the flow rate of the cooling water flowing through the drainage path can be adjusted with a simple structure.

(15) The outboard motor according to (14),
The outboard motor, wherein the second throttle mechanism is arranged in the vicinity of the outlet passage of the drainage channel.

According to (15), since the second throttle mechanism is arranged near the outlet passage of the drainage channel, it is possible to reduce fluctuations in the flow rate of the cooling water flowing through the drainage channel.

(16) The outboard motor according to (14) or (15),
The outboard motor, wherein the second throttle mechanism is an orifice.

According to (16), since the second throttle mechanism is an orifice, it is possible to accurately adjust the flow rate of the cooling water with a simple structure.

1 outboard motor 2 engine 29 water jacket 40 water pump 41 water intake channel 41A water intake port 42 water supply channel 43 water test hole 51 outlet passage 52 thermostat valve 56 drainage channel 57 drainage port 60 bypass channel 71 first orifice (first throttle mechanism)
72 second orifice (second diaphragm mechanism)
73 electromagnetic valve (bypass flow control mechanism)
74 valve control unit (control unit)
80 Information acquisition unit 81 Coolant temperature acquisition unit 82 Engine speed acquisition unit 83 Coolant pressure acquisition unit Ne Engine speed T Coolant temperature Tmin Lower limit temperature Tset Set temperature P Coolant pressure Pmin Lower limit pressure Pset Set pressure

Claims (11)

a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The drainage channel is provided with a water test hole for detecting whether the cooling water is supplied to the water jacket,
The information acquisition unit has a cooling water temperature acquisition unit that acquires a cooling water temperature of the cooling water that has passed through the water jacket,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit ,
When it is detected that the cooling water is being supplied to the water jacket by the water test hole,
The control unit
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water temperature is less than a preset lower limit temperature;
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the cooling water temperature is equal to or higher than a preset set temperature, the bypass flow control mechanism is operated so that the flow rate of the cooling water flowing through the drain port increases. and controlling the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing to the drain port is reduced when the temperature is less than the set temperature. a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The information acquisition unit has a cooling water temperature acquisition unit that acquires the cooling water temperature of the cooling water that has passed through the water jacket, and an engine speed acquisition unit that acquires the engine speed of the engine,
Based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit and the engine speed acquired by the engine speed acquisition unit of the information acquisition unit , Controls the drive of the bypass flow control mechanism ,
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water temperature is less than a preset lower limit temperature;
If the cooling water temperature is equal to or higher than the lower limit temperature, and if the engine speed is increasing, the bypass flow rate adjustment mechanism is controlled so that the flow rate of the cooling water flowing through the drain port increases, The outboard motor controls the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing through the drain port is reduced when the engine speed is low. a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The information acquisition unit includes a cooling water temperature acquisition unit that acquires the cooling water temperature of the cooling water that has passed through the water jacket, and a cooling water pressure acquisition unit that acquires the cooling water pressure of the cooling water that has passed through the water jacket. and
The control unit, based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit and the cooling water pressure acquired by the cooling water pressure acquisition unit of the information acquisition unit , An outboard motor that controls the drive of the bypass flow control mechanism. The outboard motor according to claim 3 ,
The control unit
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water temperature is less than a preset lower limit temperature;
If the cooling water temperature is equal to or higher than the lower limit temperature,
when the cooling water temperature is lower than a preset temperature, controlling the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing through the drain port is reduced;
When the cooling water temperature is equal to or higher than the set temperature, and the cooling water pressure is less than a preset set pressure, the bypass flow rate adjustment mechanism is operated so that the flow rate of the cooling water flowing through the drain port becomes small. and controlling the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing through the drain port increases when the cooling water pressure is equal to or higher than the set pressure. a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
A thermostat valve is provided in the outlet passage,
The information acquisition unit has a cooling water pressure acquisition unit that acquires the cooling water pressure of the cooling water that has passed through the water jacket,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water pressure acquired by the cooling water pressure acquisition unit of the information acquisition unit ,
controlling the bypass flow rate adjustment mechanism to prohibit the cooling water from flowing to the drain port if the cooling water pressure is less than a preset lower limit pressure;
If the cooling water pressure is equal to or higher than the lower limit pressure, and if the cooling water pressure is equal to or higher than a preset set pressure, the bypass flow rate adjustment mechanism is operated so that the flow rate of the cooling water flowing through the drain port increases. and controlling the bypass flow rate adjustment mechanism so that the flow rate of the cooling water flowing to the drain port is reduced when the pressure is less than the set pressure. a water intake channel provided with a water intake;
a water pump for pumping cooling water from the water intake through the water intake channel;
an engine formed with a water jacket through which the cooling water passes;
a water supply passage for supplying the cooling water from the water pump to the water jacket;
an outlet passage through which the cooling water that has passed through the water jacket flows out;
an outboard motor, comprising: a drainage channel through which the cooling water flowing out from the outlet passage flows, and a drainage port provided at a downstream end thereof, the outboard motor comprising:
a bypass channel for circulating the cooling water from the drainage channel to the water intake channel;
a bypass flow rate adjusting mechanism provided at a branching portion between the drainage channel and the bypass channel, and adjusting a flow rate of the cooling water flowing through the bypass channel and a flow rate of the cooling water flowing through the drain port;
a control unit that controls driving of the bypass flow rate adjustment mechanism;
an information acquisition unit that acquires information on the state of the outboard motor,
The control unit controls driving of the bypass flow rate adjustment mechanism based on the cooling water temperature acquired by the cooling water temperature acquisition unit of the information acquisition unit,
A first throttle mechanism that throttles the flow rate of the cooling water is provided in the bypass passage,
The outboard motor, wherein the first throttle mechanism is arranged in the vicinity of a junction of the bypass passage and the water intake passage. The outboard motor according to claim 6,
The outboard motor, wherein the first throttle mechanism is an orifice. The outboard motor according to any one of claims 1 to 7 ,
The outboard motor, wherein the bypass flow control mechanism is an electromagnetic valve . The outboard motor according to any one of claims 1 to 8 ,
An outboard motor, wherein a second throttling mechanism for throttling a flow rate of the cooling water is provided in the drainage passage. The outboard motor according to claim 9 ,
The outboard motor, wherein the second throttle mechanism is arranged in the vicinity of the outlet passage of the drainage channel. 11. The outboard motor according to claim 9 , wherein
The outboard motor, wherein the second throttle mechanism is an orifice.

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