JP2019147399A - Saddle-riding type vehicle - Google Patents

Abstract

To provide a saddle-riding type vehicle which comprises a brake booster device appropriate for both a condition in which a main switch is turned off and a traveling condition of the vehicle.SOLUTION: The saddle-riding type vehicle comprises a brake booster device capable of boosting brake fluid pressure in accordance with brake fluid pressure generated by one master cylinder. One wheel cylinder operates by receiving brake fluid pressure generated by one master cylinder, when operating one brake operator which actuates one master cylinder with at least a predetermined reference operation amount or greater in a condition where at least the vehicle is made stop and a main switch is turned off. Further, the wheel cylinder operates by receiving break fluid pressure generated by boosting of the break booster device, when travelling in a vehicle traveling condition and operating one break operator with at least a prescribed reference operation amount or greater.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a saddle-ride type vehicle equipped with a brake booster.

  In a four-wheeled vehicle such as a passenger car or a truck, the vehicle is heavy, and it may be necessary to maintain a stop of the vehicle with only the driver's operating force on a slope or the like. In this state, the brake booster is also operated (see Patent Document 1 below, particularly Paragraph 0049, FIG. 5 and the like). Further, in a four-wheeled vehicle, it is rare that the vehicle is moved with the main switch off, and the brake operation is not performed many times with the main switch off.

  On the other hand, in a saddle-ride type vehicle such as a two-wheeled vehicle, in recent years, an electric brake booster used in a passenger car, a truck, or the like has been proposed (for example, Patent Document 2 below).

  In a saddle-ride type vehicle such as a two-wheeled vehicle, the driver can move the vehicle by pushing the vehicle, and the brake operation is repeatedly performed even when the main switch is off. In addition, since saddle-ride type vehicles have a small vehicle body and are equipped with a small battery, it is highly necessary to pay attention to the power consumption of the equipment. Furthermore, for example, in motorcycles, etc., it is not used during the snowfall period, and the battery discharges slowly during that period, so there is a possibility that there is not enough charge at the start of use, and the electric brake with the main switch off It is conceivable that the amount of charge further decreases due to the operation of the booster.

  Thus, there is a need for a brake booster that is more suitable for the situation of use of saddle riding type vehicles than four-wheeled vehicles.

JP 2012-116278 A JP 2000-335399 A

  Accordingly, an object of the present invention is to provide a saddle-ride type vehicle provided with a brake booster suitable for both a state where a main switch is turned off and a traveling state of the vehicle.

  The inventors have studied a brake booster suitable for a saddle-ride type vehicle.

  Usually, a saddle-ride type vehicle has a front wheel braking operator and a rear wheel braking operator. By operating the front wheel braking operator, a braking force is generated on the front wheel. Similarly, a braking force is generated on the rear wheel by operating the rear wheel braking operator. In this way, the saddle-ride type vehicle has a plurality of braking operators, and by operating these braking operators, it is possible to generate a braking force on the front wheels and the rear wheels at the rider's will. .

  Moreover, since the saddle-ride type vehicle has a relatively light vehicle weight, the vehicle may be moved with the vehicle stopped and the main switch turned off. At that time, it is configured to generate a braking force on the front wheels and the rear wheels by operating a plurality of braking operators.

  Furthermore, during research, there is a very large difference between the braking force required when moving the vehicle with the vehicle main switch turned off and the braking force required during vehicle travel. I found it. The braking force required when the vehicle is stopped and the vehicle is moved with the main switch turned off may be much smaller than the braking force required during vehicle travel. This is considered to be due to the fact that the saddle-ride type vehicle is relatively light and the vehicle moves at a low speed with the main switch turned off.

  From these facts, the present inventors have examined the configuration of the brake booster suitable for both the state where the vehicle is stopped and the main switch is turned off, and the traveling state of the vehicle. It came to.

A saddle-ride type vehicle according to the present invention includes a vehicle body,
Front and rear wheels supported by the vehicle body;
A front wheel brake provided on the front wheel, including a front wheel wheel cylinder, and generating a braking force on the front wheel;
A front wheel braking operator that can be operated by the rider;
A front wheel master cylinder that operates by operating the front wheel braking operation element;
Front wheel brake fluid passage connecting the front wheel master cylinder and the front wheel wheel cylinder;
A rear wheel brake provided on the rear wheel, including a rear wheel wheel cylinder, and generating a braking force on the rear wheel;
A rear-wheel braking operator that can be operated by the rider;
A rear wheel master cylinder that operates by operating the rear wheel braking operation element;
A rear wheel brake fluid passage connecting the rear wheel master cylinder and the rear wheel wheel cylinder;
A handle configured to support at least one of the front wheel braking operator or the rear wheel braking operator and to change the direction of the front wheel;
One master cylinder brake fluid pressure detector for detecting brake fluid pressure generated by one master cylinder of the front wheel master cylinder or the rear wheel master cylinder, at least one electric booster, and the one master cylinder A controller that drives the electric booster based on a signal from a brake fluid pressure detector, and a brake booster that can boost the brake fluid pressure according to the brake fluid pressure generated by the one master cylinder; With
One brake fluid passage to which the one master cylinder is connected is formed independently of the other brake fluid passage,
One wheel cylinder to which the one brake fluid passage is connected is
When at least one braking operation element that operates the one master cylinder is operated with an operation amount equal to or greater than a predetermined reference operation amount with the vehicle stopped and the main switch turned off, The master cylinder operates under the brake fluid pressure generated,
The brake booster is operated in response to the boosted brake hydraulic pressure when the one braking operator is operated at an operation amount that is at least a predetermined reference operation amount in the vehicle running state. Features.

  According to the above configuration, when the brake of the saddle-ride type vehicle is used, if the brake fluid pressure needs to be boosted, the brake booster can be appropriately operated and unnecessary operations can be suppressed. As a result, it is possible to provide a saddle-ride type vehicle equipped with a brake booster suitable for both the state where the main switch is turned off and the traveling state of the vehicle.

  The control unit drives the electric booster when the one of the braking operation elements is operated in the vehicle running state, and basically increases the brake hydraulic pressure boosted by the electric booster. You may make it act on one wheel cylinder.

The brake booster is
An electric valve provided in the one brake fluid passage, capable of changing a cross-sectional area of the one brake fluid passage, and driven by the control unit;
The electric valve is
When at least one brake operation element that operates the one master cylinder is operated with an operation amount equal to or greater than a predetermined reference operation amount with the vehicle stopped and the main switch turned off, The one brake fluid passage may be in a communicating state so that the one wheel cylinder is actuated by receiving the brake fluid pressure generated in the master cylinder.

The electric booster is an electric gear pump, an electric trochoid pump, an electric piston pump, or an electric master cylinder,
The control unit drives the electric booster when the vehicle is running and when the one brake operation element is operated with an operation amount equal to or greater than a predetermined reference operation amount. The brake fluid pressure boosted in step 1 may be applied to the one wheel cylinder.

  The control unit is configured to prevent a brake hydraulic pressure generated by the one master cylinder when the one braking operation element is operated with an operation amount equal to or greater than a predetermined reference operation amount in the vehicle running state. The brake fluid pressure boosted at a predetermined ratio may be applied to the one wheel cylinder.

The saddle riding type vehicle includes a running state detection unit that detects data related to the running state of the vehicle,
The control unit is configured to detect a signal from the traveling state detection unit and the one master cylinder when the vehicle traveling state and the one brake operation element are operated with an operation amount equal to or greater than a predetermined reference operation amount. The electric booster is driven based on the signal of the brake fluid pressure detection unit, and the brake fluid pressure boosted at a ratio corresponding to the traveling state of the vehicle is generated with respect to the brake fluid pressure generated by the one master cylinder. You may make it act on said one wheel cylinder.

  The one brake operator may be supported by the handle.

  The brake booster may be supported by the vehicle main body so as to be displaceable with respect to the front wheels and the rear wheels.

  According to the saddle riding type vehicle of the present invention, it is possible to provide a saddle riding type vehicle equipped with a brake booster suitable for both the state where the main switch is turned off and the running state of the vehicle.

1 is a side view showing a schematic configuration of a motorcycle. It is a schematic block diagram of the brake system of Embodiment 1. It is a functional block diagram of a brake booster for a front wheel. It is a functional block diagram of a brake booster for a rear wheel. It is a flowchart which shows the procedure of control of a brake booster. It is a schematic block diagram of the brake system of Embodiment 2.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. A motorcycle is taken as an example of the saddle-ride type vehicle in the first embodiment. However, the saddle-ride type vehicle of the present invention is not limited to a motorcycle, and the number of front wheels and rear wheels is not limited. For example, a three-wheel or four-wheel saddle-ride type vehicle may be used. In the following description, front and rear and left and right are based on the forward direction of the motorcycle.

  FIG. 1 is a side view showing a schematic configuration of a motorcycle. The motorcycle 1 includes a body frame 2, a front wheel 3, and a rear wheel 4. The front wheel 3 is provided with a front wheel brake 30 that generates a braking force on the front wheel 3. The rear wheel 4 is provided with a rear wheel brake 40 that generates a braking force on the rear wheel 4. The front wheel brake 30 is a disc brake composed of a front wheel brake disc 31 and a front wheel brake caliper 32. A front wheel wheel cylinder 33 is disposed on the front brake caliper 32. The rear wheel brake 40 is a disc brake composed of a rear wheel brake disc 41 and a rear wheel brake caliper 42. A rear wheel wheel cylinder 43 is disposed in the rear wheel brake caliper 42.

  A handle 20 configured to change the direction of the front wheel 3 is attached to the body frame 2. The body frame 2 is provided with an ECU (Electronic Control Unit) 21 that controls the operation of each part of the motorcycle 1. A front wheel speed sensor 34 is provided on the front wheel 3, and a rear wheel speed sensor 44 is provided on the rear wheel 4.

  Further, an IMU (Internal Measurement Unit) 22 is provided on the vehicle body frame 2. The IMU 22 measures the acceleration and angular velocity of the vehicle. Further, the gyro sensor 23, the longitudinal acceleration sensor 24, the vehicle body speed detection unit 25, the pitch angle detection unit 26, the roll angle detection unit 27, and the like may be provided on the vehicle body frame 2. The vehicle body speed detector 25 calculates the vehicle body speed of the motorcycle 1 based on the front wheel speed detected by the front wheel speed sensor 34 and the rear wheel speed detected by the rear wheel speed sensor 44. To do. The pitch angle detection unit 26 receives the pitch rate of the motorcycle 1 from the gyro sensor 23. The pitch angle detection unit 26 detects the pitch angle of the motorcycle 1 based on these input values. The roll angle detector 27 receives the roll rate of the motorcycle 1 from the gyro sensor 23. The roll angle detector 27 detects the roll angle of the motorcycle 1 based on these input values.

  FIG. 2 shows a schematic configuration of a brake system 7 provided in the motorcycle 1. 3A and 3B are functional block diagrams of the brake boosters 70 and 80 included in the brake system 7. The brake system 7 includes a front wheel wheel cylinder 33 provided on the front wheel 3 and a rear wheel wheel cylinder 43 provided on the rear wheel 4. The brake system 7 includes a front wheel braking operation element 51 and a rear wheel braking operation element 61 that are configured to be operated by a rider who operates the motorcycle 1. In the present embodiment, a brake lever supported by the handle 20 is shown as an example of the front wheel braking operation element 51 and the rear wheel braking operation element 61. However, the front wheel braking operation element 51 and the rear wheel braking operation element 61 are not limited to these forms, and the rear wheel braking operation element 61 may be in the form of a brake pedal supported by the vehicle body frame 2, for example.

  The brake system 7 is connected to a front wheel braking operation element 51 and is connected to a front wheel master cylinder 52 that generates a brake fluid pressure corresponding to the operating force of the front wheel braking operation element 51 by a rider, and a rear wheel braking operation element 61. And a rear wheel master cylinder 62 that generates a brake fluid pressure corresponding to the operating force of the rear wheel braking operation element 61 by the rider. The front wheel master cylinder 52 is connected to the front wheel wheel cylinder 33 by a front wheel brake fluid passage 53. The rear wheel master cylinder 62 is connected to the rear wheel wheel cylinder 43 by a rear wheel brake fluid passage 63. The front wheel brake fluid passage 53 and the rear wheel brake fluid passage 63 are formed independently.

  The brake system 7 includes brake boosters 70 and 80. The brake boosters 70 and 80 are supported by the vehicle body. Here, the vehicle body is a part excluding the wheel unit (the front wheel 3 including the front wheel brake 30 and the rear wheel 4 including the rear wheel brake 40), and is a concept including the body frame 2, the handle 20, and the like. The brake boosters 70 and 80 supported by the vehicle body can be displaced with respect to the front wheel 3 and the rear wheel 4 and do not hinder the vertical movement of the front wheel 3 and the rear wheel 4.

  The brake booster is provided on one or both of the front wheel brake fluid passage 53 and the rear wheel brake fluid passage 63. Here, an example is shown in which the brake booster 70 is provided on the front wheel brake fluid passage 53 and the brake booster 80 is provided on the rear wheel brake fluid passage 63.

  The brake booster 70 includes a master cylinder brake fluid pressure detector 71 that detects the brake fluid pressure generated by the front wheel master cylinder 52, at least one electric booster 72, and a signal from the master cylinder brake fluid pressure detector 71. And a control unit 73 for driving the electric booster 72 based on the above, and configured to be able to boost the brake fluid pressure received by the front wheel wheel cylinder 33 in accordance with the brake fluid pressure generated by the front wheel master cylinder 52. .

  The brake booster 80 includes a master cylinder brake fluid pressure detector 81 that detects the brake fluid pressure generated by the rear wheel master cylinder 62, at least one electric booster 82, and a master cylinder brake fluid pressure detector. And a controller 83 that drives the electric booster 82 based on the signal 81, and boosts the brake fluid pressure received by the rear wheel wheel cylinder 43 in accordance with the brake fluid pressure generated by the rear wheel master cylinder 62. Configured to be possible.

  As the master cylinder brake fluid pressure detectors 71 and 81, pressure sensors that detect the brake fluid pressure generated by the front wheel master cylinder 52 and the rear wheel master cylinder 62 can be used. Master cylinder brake fluid pressure detectors 71 and 81 output a signal corresponding to the detected brake fluid pressure.

  Control units 73 and 83 include boost pressure determining units 73a and 83a. The boost pressure determination units 73a and 83a boost the brake fluid pressure generated by the front wheel master cylinder 52 or the rear wheel master cylinder 62 based on the signals output from the master cylinder brake fluid pressure detection units 71 and 81. Can be determined.

  Control units 73 and 83 include booster drive units 73b and 83b. The booster driving units 73b and 83b drive the electric boosters 72 and 82 based on the boost pressure determined by the boost pressure determining units 73a and 83a. The electric boosters 72 and 82 are not particularly limited as long as the brake fluid pressure can be boosted electrically, but an electric gear pump, an electric trochoid pump, an electric piston pump (including a swash plate pump), or An electric master cylinder is exemplified. However, it is preferable to use a pump with a small hydraulic pressure fluctuation.

  The front wheel wheel cylinder 33 operates the front wheel brake operation element 51 that operates the front wheel master cylinder 52 with an operation amount equal to or greater than a predetermined reference operation amount at least with the vehicle stopped and the main switch turned off. When this occurs, the brake hydraulic pressure generated in the front wheel master cylinder 52 is received to operate.

  When the motorcycle 1 is stopped and the motorcycle 1 is moved with the main switch turned off, the motorcycle 1 is relatively light and the motorcycle 1 moves at a low speed. If the child 51 is operated with an operation amount equal to or greater than a predetermined reference operation amount, the front wheel wheel cylinder 33 can generate a necessary braking force. Therefore, when the front wheel braking operator 51 that operates the front wheel master cylinder 52 is operated with an operation amount that is at least a predetermined reference operation amount at least with the vehicle stopped and the main switch turned off, The wheel cylinder 33 operates by receiving the brake hydraulic pressure generated in the front wheel master cylinder 52 without being boosted by the brake booster 70.

  On the other hand, the front wheel wheel cylinder 33 is a brake fluid pressure boosted by the brake booster device 70 when the vehicle is running and the front wheel brake operation element 51 is operated with an operation amount that is at least a predetermined reference operation amount. Act upon.

  If the motorcycle 1 is in a running state and the front wheel braking operation element 51 is operated with an operation amount equal to or greater than a predetermined reference operation amount, it can be said that the rider needs a relatively large braking force. For this reason, when the front wheel braking operator 51 is operated with an operation amount that is at least a predetermined reference operation amount while the vehicle is running, the front wheel wheel cylinder 33 reduces the brake hydraulic pressure generated in the front wheel master cylinder 52. The brake booster 70 operates by receiving a boosted brake fluid pressure.

  According to the saddle-ride type vehicle of the present invention, when the brake fluid pressure needs to be boosted when the brake of the saddle-ride type vehicle is used, the brake booster 70 is appropriately operated and unnecessary operation is suppressed. be able to. As a result, it is possible to provide a saddle-ride type vehicle equipped with a brake booster suitable for both the state where the main switch is turned off and the traveling state of the vehicle.

  Further, the rear wheel wheel cylinder 43 has at least a predetermined reference operation amount or more for the rear wheel braking operation element 61 that operates the rear wheel master cylinder 62 in a state where the vehicle is stopped and the main switch is turned off. When the operation amount is, the brake fluid pressure generated in the rear wheel master cylinder 62 is received to operate.

  When the motorcycle 1 is stopped and the motorcycle 1 is moved with the main switch turned off, the motorcycle 1 is relatively light and the motorcycle 1 moves at a low speed. If the operation element 61 is operated with an operation amount equal to or greater than a predetermined reference operation amount, the rear wheel wheel cylinder 43 can generate a necessary braking force. Therefore, when the rear wheel brake operation element 61 that operates the rear wheel master cylinder 62 is operated at an operation amount that is at least a predetermined reference operation amount with at least the vehicle stopped and the main switch turned off, The rear wheel wheel cylinder 43 operates by receiving the brake hydraulic pressure generated in the rear wheel master cylinder 62 as it is without being boosted by the brake booster 80.

  On the other hand, the rear wheel wheel cylinder 43 is a brake boosted by the brake booster 80 when the vehicle is running and the rear wheel brake operation element 61 is operated at an operation amount that is at least a predetermined reference operation amount. Operates under hydraulic pressure.

  If the motorcycle 1 is in a traveling state and the rear wheel brake operation element 61 is operated with an operation amount equal to or greater than a predetermined reference operation amount, it can be said that the rider needs a relatively large braking force. Therefore, when the rear wheel braking operation element 61 is operated with an operation amount that is at least a predetermined reference operation amount in the vehicle running state, the rear wheel wheel cylinder 43 is braked by the rear wheel master cylinder 62. The brake is actuated by receiving the brake fluid pressure boosted by the brake booster 80.

  The “reference operation amount” in the present invention is an operation amount for determining a situation where the rider needs a relatively large braking force. For example, the front wheel braking operation element 51 and the rear wheel braking operation element 61 One half of the total operation amount may be set as the reference operation amount. Alternatively, a reference operation force may be determined based on experimental values and design values, and an operation amount reaching the operation force may be set as a reference operation amount. Further, the reference operation amount may be a value different between the front wheel and the rear wheel.

  According to the saddle-ride type vehicle of the present invention, when the brake fluid pressure needs to be boosted when the brake of the saddle-ride type vehicle is used, the brake booster 80 is appropriately operated and unnecessary operations are suppressed. be able to. As a result, it is possible to provide a saddle-ride type vehicle equipped with a brake booster suitable for both the state where the main switch is turned off and the traveling state of the vehicle.

  In the present invention, “the main switch is in an off state” is determined not only in the state in which the mechanical main switch connected to the vehicle is off, but also in the brake control software that the main switch is off. It is the state that was done. Therefore, for example, when the mechanical main switch is turned off while traveling at a high speed, the brake booster can be operated if the brake control software does not determine that the main switch is off. In addition, when the vehicle is above a certain speed threshold (for example, 10 km / h), the brake booster is kept operating or the brake booster is operated until the vehicle is completely stopped (0 km / h). Or leave it alone.

  By the way, the above-mentioned Patent Document 2 includes a primary wheel cylinder and a secondary wheel cylinder that can operate a brake caliper when hydraulic pressure is supplied to a brake caliper of a disc brake of a wheel in a motorcycle. The output port of the master cylinder operated by the operator is connected to the cylinder, and the secondary wheel cylinder doubles the proportional booster valve that draws the boosted hydraulic pressure proportional to the output hydraulic pressure of the master cylinder from the hydraulic source including the hydraulic pump. A brake device connected to a hydraulic chamber is disclosed.

  According to the brake device of Patent Document 2, the operator can strongly brake the wheel with a relatively small operation force on the master cylinder. Further, an increase in unsprung load can be suppressed by installing a hydraulic pressure source and a proportional pressure increasing valve for applying a boost hydraulic pressure to the brake caliper above the suspension spring of the motorcycle.

  Thus, in a saddle-ride type vehicle such as a motorcycle, it is desired to suppress the weight of a wheel unit that moves up and down with respect to the vehicle body as much as possible. According to the saddle-ride type vehicle of the present invention, the brake hydraulic pressure can be boosted by the brake booster 70 or the brake booster 80 when a large braking force is required. The rear wheel brake caliper 42 can be reduced in size, and as a result, the weight of the wheel unit that moves up and down with respect to the vehicle body can be suppressed while ensuring the necessary braking force.

  The brake booster 70 may include an electric valve 74 provided in the front wheel brake fluid passage 53 and capable of changing the cross-sectional area of the front wheel brake fluid passage 53. The electric valve 74 is disposed between the front wheel master cylinder 52 and the connection portion of the electric booster 72 to the brake fluid passage 53. The brake booster 80 may include an electric valve 84 provided in the rear wheel brake fluid passage 63 and capable of changing the cross-sectional area of the rear wheel brake fluid passage 63. The electric valve 84 is disposed between the rear wheel master cylinder 62 and the connection portion of the electric booster 82 to the brake fluid path 63. The electric valves 74 and 84 are driven by valve drive units 73c and 83c of the control units 73 and 83.

  The electric valve 74 is a valve (normally open valve) that is in a communication state when no current is supplied to the solenoid. At least the vehicle is stopped and the main switch is turned off, and the front wheel master cylinder 52 is turned off. When the front wheel braking operation element 51 that operates the vehicle is operated with an operation amount that is at least a predetermined reference operation amount, the front wheel wheel cylinder 33 is activated by receiving the brake fluid pressure generated in the front wheel master cylinder 52. The brake fluid passage 53 is kept in communication. On the other hand, the electric valve 74 receives the brake fluid pressure boosted by the electric booster 72 when the vehicle is running and the front wheel braking operator 51 is operated at an operation amount that is at least a predetermined reference operation amount. Thus, the brake fluid passage 53 can be shut off so that the front wheel wheel cylinder 33 operates.

  The electric valve 84 is a valve (normally open valve) that is in communication when no current is supplied to the solenoid, and at least the vehicle is stopped and the main switch is turned off, and the rear wheel master cylinder The rear wheel wheel cylinder 43 receives the brake fluid pressure generated in the rear wheel master cylinder 62 when the rear wheel braking operation element 61 that operates the motor 62 is operated with an operation amount that is at least a predetermined reference operation amount. The brake fluid path 63 remains in communication so that it operates. On the other hand, when the electric valve 84 is in a vehicle running state and the rear wheel brake operation element 61 is operated with an operation amount that is at least a predetermined reference operation amount, the electric booster 82 boosts the brake hydraulic pressure. The brake fluid path 63 can be shut off so that the rear wheel wheel cylinder 43 is actuated.

  The motorcycle 1 may include a traveling state detection unit that detects data related to the traveling state of the vehicle. Specifically, the data related to the running state of the vehicle is a vehicle body speed, a pitch angle, a roll angle, and the like. Examples of the running state detection unit include an IMU 22, a vehicle body speed detection unit 25, a pitch angle detection unit 26, a roll angle detection unit 27, and the like.

  The control units 73 and 83 are signals of the traveling state detection unit when the vehicle is in a traveling state and the front wheel braking operation element 51 or the rear wheel braking operation element 61 is operated with an operation amount that is at least a predetermined reference operation amount. The electric boosters 72 and 82 are driven on the basis of signals from the master cylinder brake fluid pressure detectors 71 and 81, and the vehicle is controlled against the brake fluid pressure generated by the front wheel master cylinder 52 or the rear wheel master cylinder 62. Thus, the brake hydraulic pressure boosted at a ratio corresponding to the traveling state can be applied to the front wheel master cylinder 52 or the rear wheel master cylinder 62. The boost ratio according to the running state of the vehicle is determined by the boost pressure determining units 73a and 83a.

  Next, the control of the brake boosters 70 and 80 will be described with reference to FIG. FIG. 4 is a flowchart showing a control procedure of the brake boosters 70 and 80.

  First, as shown in FIG. 4, it is determined whether or not the vehicle is traveling (step S1). Whether or not the vehicle is traveling is determined by, for example, the vehicle body speed detection unit 25. When the vehicle is stopped, the valve drive units 73c and 83c do not drive the electric valves 74 and 84, but communicate the brake fluid passages 53 and 63 that connect the master cylinders 52 and 62 and the wheel cylinders 33 and 43. Leave. As a result, the brake fluid pressure in the brake fluid passages 53 and 63 is not boosted.

  If the vehicle is traveling, the master cylinder brake fluid pressure detectors 71 and 81 detect the brake fluid pressure generated by the front wheel master cylinder 52 and the rear wheel master cylinder 62 (step S2).

  Next, the valve drive units 73c and 83c drive the electric valves 74 and 84 to block the brake fluid passages 53 and 63 connecting the master cylinders 52 and 62 and the wheel cylinders 33 and 43 (step S3).

  Next, the traveling state of the vehicle is detected by the traveling state detection unit (step S4).

  Finally, the boost pressure determining units 73a and 83a determine the boost pressure according to the vehicle traveling state detected by the traveling state detecting unit (step S5). The booster drive units 73b and 83b drive the electric boosters 72 and 82 based on the boost pressure determined by the boost pressure determination units 73a and 83a.

(Embodiment 2)
In the first embodiment, an example in which the boosted brake fluid passage shares a part with the brake fluid passages 53 and 63 that connect the master cylinders 52 and 62 and the wheel cylinders 33 and 43 is shown in FIG. As such, the boosted brake fluid path may be independent of the brake fluid path connecting the master cylinders 52 and 62 and the wheel cylinders 33 and 43.

[Another embodiment]
(1) The control units 73 and 83 drive the electric boosters 72 and 82 when the vehicle is running and the front wheel braking operation element 51 or the rear wheel braking operation element 61 is operated. The brake hydraulic pressure boosted by the type boosters 72 and 82 may be applied to the front wheel wheel cylinder 33 or the rear wheel wheel cylinder 43. Here, “basically” means that the electric boosters 72 and 82 are almost always driven to boost when the vehicle is in a running state. As a result, when the front wheel braking operation element 51 or the rear wheel braking operation element 61 is operated in the vehicle running state, the electric boosters 72 and 82 are basically driven, so that the vehicle can be secured while ensuring the necessary braking force. The weight of the wheel unit that moves up and down with respect to the main body can be suppressed.

  (2) The control units 73 and 83 control the front wheel master when the vehicle is running and the front wheel braking operation element 51 or the rear wheel braking operation element 61 is operated with an operation amount that is at least a predetermined reference operation amount. The brake fluid pressure boosted at a predetermined ratio with respect to the brake fluid pressure generated by the cylinder 52 or the rear wheel master cylinder 62 may be applied to the front wheel wheel cylinder 33 or the rear wheel wheel cylinder 43.

  (3) The brake booster may be provided for both the front wheel 3 and the rear wheel 4 as described above, but may be provided only for the front wheel 3 or the rear wheel 4.

  (4) The brake booster may be combined with an ABS device or an interlocking brake device. Moreover, you may make it a part of brake booster serve as a part of an ABS apparatus or a interlocking brake apparatus.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 Front wheel 4 Rear wheel 20 Handle 30 Front wheel brake 33 Front wheel wheel cylinder 40 Rear wheel brake 43 Rear wheel wheel cylinder 51 Front wheel braking operation element 52 Front wheel master cylinder 53 Front wheel brake fluid path 61 Rear wheel Braking operator 62 Rear wheel master cylinder 63 Rear wheel brake fluid path 70 Brake booster 71 Master cylinder brake fluid pressure detector 72 Electric booster 73 Controller 74 Electric valve 80 Brake booster 81 Master cylinder brake fluid Pressure detection unit 82 Electric booster 83 Control unit 84 Electric valve

Claims (8)

A vehicle body,
Front and rear wheels supported by the vehicle body;
A front wheel brake provided on the front wheel, including a front wheel wheel cylinder, and generating a braking force on the front wheel;
A front wheel braking operator that can be operated by the rider;
A front wheel master cylinder that operates by operating the front wheel braking operation element;
Front wheel brake fluid passage connecting the front wheel master cylinder and the front wheel wheel cylinder;
A rear wheel brake provided on the rear wheel, including a rear wheel wheel cylinder, and generating a braking force on the rear wheel;
A rear-wheel braking operator that can be operated by the rider;
A rear wheel master cylinder that operates by operating the rear wheel braking operation element;
A rear wheel brake fluid passage connecting the rear wheel master cylinder and the rear wheel wheel cylinder;
A handle configured to support at least one of the front wheel braking operator or the rear wheel braking operator and to change the direction of the front wheel;
One master cylinder brake fluid pressure detector for detecting brake fluid pressure generated by one master cylinder of the front wheel master cylinder or the rear wheel master cylinder, at least one electric booster, and the one master cylinder A controller that drives the electric booster based on a signal from a brake fluid pressure detector, and a brake booster that can boost the brake fluid pressure according to the brake fluid pressure generated by the one master cylinder; With
One brake fluid passage to which the one master cylinder is connected is formed independently of the other brake fluid passage,
One wheel cylinder to which the one brake fluid passage is connected is
When at least one braking operation element that operates the one master cylinder is operated with an operation amount equal to or greater than a predetermined reference operation amount with the vehicle stopped and the main switch turned off, The master cylinder operates under the brake fluid pressure generated,
The brake booster is operated in response to the boosted brake hydraulic pressure when the one braking operator is operated at an operation amount that is at least a predetermined reference operation amount in the vehicle running state. A saddle-ride type vehicle.   The control unit drives the electric booster when the one of the braking operation elements is operated in the vehicle running state, and basically increases the brake hydraulic pressure boosted by the electric booster. The saddle riding type vehicle according to claim 1, wherein the saddle riding type vehicle acts on one of the wheel cylinders. The brake booster is
An electric valve provided in the one brake fluid passage, capable of changing a cross-sectional area of the one brake fluid passage, and driven by the control unit;
The electric valve is
When at least one brake operation element that operates the one master cylinder is operated with an operation amount equal to or greater than a predetermined reference operation amount with the vehicle stopped and the main switch turned off, The saddle-ride type vehicle according to claim 1 or 2, wherein the one brake fluid passage is brought into a communication state so that the one wheel cylinder is operated in response to a brake fluid pressure generated in a master cylinder. . The electric booster is an electric gear pump, an electric trochoid pump, an electric piston pump, or an electric master cylinder,
The control unit drives the electric booster when the vehicle is running and when the one brake operation element is operated with an operation amount equal to or greater than a predetermined reference operation amount. The saddle riding type vehicle according to any one of claims 1 to 3, wherein the brake hydraulic pressure boosted in step (a) is applied to the one wheel cylinder.   The control unit is configured to prevent a brake hydraulic pressure generated by the one master cylinder when the one braking operation element is operated with an operation amount equal to or greater than a predetermined reference operation amount in the vehicle running state. The saddle riding type vehicle according to any one of claims 1 to 4, wherein the brake fluid pressure boosted at a predetermined ratio is applied to the one wheel cylinder. The saddle riding type vehicle includes a running state detection unit that detects data related to the running state of the vehicle,
The control unit is configured to detect a signal from the traveling state detection unit and the one master cylinder when the vehicle traveling state and the one brake operation element are operated with an operation amount equal to or greater than a predetermined reference operation amount. The electric booster is driven based on the signal of the brake fluid pressure detection unit, and the brake fluid pressure boosted at a ratio corresponding to the traveling state of the vehicle is generated with respect to the brake fluid pressure generated by the one master cylinder. The saddle riding type vehicle according to any one of claims 1 to 5, wherein the saddle riding type vehicle acts on the one wheel cylinder.   The saddle-ride type vehicle according to any one of claims 1 to 6, wherein the one braking operator is supported by the handle. The saddle riding type vehicle according to any one of claims 1 to 7, wherein the brake booster is supported by the vehicle body so as to be displaceable with respect to the front wheels and the rear wheels.

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