Electric vehicle braking system suitable for handlebar braking

Abstract

The invention discloses an electric vehicle braking system suitable for handlebar braking. Comprising a brake handle, a handle bar and a handle bar, the brake stroke detection unit is used for detecting the pressing stroke of the brake handle; the brake assembly is used for braking vehicle wheels; the control unit is electrically connected with the brake stroke detection unit and the motor and is used for controlling the motor to reduce torque output and / or controlling the brake assembly to brake vehicle wheels according to a stroke signal detected by the brake stroke detection unit; and the power supply unit is electrically connected with the brake stroke detection unit, the control unit and the motor and is used for providing electric energy. By detecting the pressing stroke of the braking handle, reduction of the torque of the motor and braking of the vehicle are controlled in different stroke sections, the clutch function which is not achieved by an electric vehicle is achieved, the maximum torque acting on a wheel set in the running process of the motor can be limited, and the service life of the motor is prolonged. And original oil-driven vehicle type driver habits and electric vehicle type driver habits can be compatible.

Description

Technical Field

[0001] The invention relates to the technical field of handlebar controlled braking, in particular to an electric vehicle braking system suitable for handlebar braking. Background Art

[0002] The existing braking scheme of electric vehicles with handlebar brakes is to cut off the power after squeezing the brake, that is, the brake switch signal will be triggered and forwarded to the controller after the handlebar brake is applied. The controller will immediately stop the torque output to the motor after receiving the signal. This brake control strategy can ensure that the power can be cut off during emergency braking during the journey, and can effectively cooperate with the electromagnetic brake function to directly convert the riding energy into electrical energy recovery during the braking process, and can also ensure that the motor can be controlled when out of control or stopped.

[0003] However, this situation will also result in the removal of all power during braking, which may lead to driving accidents in some situations where only power reduction but not cutting off is required. In addition, this braking strategy is too simple and not delicate enough, and is not suitable for precise control of vehicle operation and movement.

[0004] In traditional gasoline-powered vehicles, the left hand is responsible for the clutch function, but in electric bicycles, some electric motorcycles, and bicycles, the left hand is responsible for the rear brake function. When driving a gasoline-powered vehicle and then adapting to an electric vehicle, there will be a process of changing driving habits, and accidents may occur during this process of changing driver behavior habits. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an electric vehicle braking system suitable for handlebar braking to reduce the occurrence of corresponding uncontrollable situations as much as possible and provide a neutralization solution close to the left-hand rear wheel brake and the engine clutch.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions: An electric vehicle braking system suitable for handlebar braking, comprising: Brake handle; A brake stroke detection unit, used to detect the brake handle pressing stroke; Brake assembly, used for braking vehicle wheels; a control unit connected to the brake stroke detection unit and the motor, and controlling the motor to reduce torque output and / or controlling the brake assembly to brake the vehicle wheels according to the stroke signal detected by the brake stroke detection unit; and A power supply unit is connected to the control unit and is used to provide electrical energy.

[0007] In the above technical solution, preferably, the control unit controls the internal electronic devices according to the stroke signal detected by the brake stroke detection unit and the current state of the vehicle, and the output is converted by the electronic devices to control the motor to reduce torque output or control the brake assembly and the motor to reversely brake the vehicle wheels.

[0008] In the above technical solution, preferably, the pressing stroke of the brake handle is divided into a front stroke and a rear stroke. When the brake handle is in the front stroke, the control unit controls the motor to reduce the torque output; when the brake handle is in the rear stroke, the control unit controls the brake assembly and the motor to reversely brake the vehicle wheels.

[0009] In the above technical solution, preferably, the pressing stroke of the brake handle is divided into a front stroke and a rear stroke. During the movement of the brake handle from an initial position to the end of the front stroke, the control unit controls the motor to gradually reduce the torque output; during the movement of the brake handle from the beginning of the rear stroke to the end of the rear stroke, the control unit controls the brake assembly and the motor to reversely increase the force of braking the vehicle wheels.

[0010] In the above technical solution, preferably, when the pressing stroke of the brake handle is at the end of the front stroke, the control unit controls the motor to reduce the motor torque output to 0; when the pressing stroke of the brake handle is at the end of the rear stroke, the control unit controls the brake assembly and the motor to reverse to achieve maximum braking force.

[0011] In the above technical solution, preferably, when the brake handle is in the rear stroke, the control unit controls the motor torque reverse drag and / or power recovery.

[0012] In the above technical solution, preferably, when the brake handle is in the rear stroke, the brake lights on the vehicle are triggered to light up.

[0013] In the above technical solution, preferably, when the brake handle is in the rear stroke, the control unit controls the brake lights on the vehicle to light up.

[0014] In the above technical solution, preferably, the brake handle includes a fixing seat installed on the vehicle, a handle rotatably connected to the fixing seat, and a torsion spring, wherein the torsion spring is installed at the rotational connection position between the handle and the fixing seat to reset the handle.

[0015] In the above technical solution, preferably, the control unit may be equipped with an ABS braking system and connected to the ABS braking system via cables and oil circuits.

[0016] The beneficial effects of the present invention are: The present invention detects the pressing stroke of the brake handle to control the reduction of the motor torque and the braking of the vehicle in different stroke sections. It has a "clutch" function that electric vehicles do not have, and can limit the maximum torque acting on the wheel set during driving by the motor. It is compatible with the original driver habits of gasoline-powered vehicles and electric vehicle drivers. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with specific embodiments: An electric vehicle braking system suitable for handlebar braking comprises a brake handle installed on the vehicle, a brake stroke detection unit, a brake assembly, a control unit and a power supply unit.

[0018] Among them, the brake stroke detection unit is used to detect the brake handle pressing stroke, and specifically a sensor can be used to detect the handle pressing stroke; the brake assembly is used to brake the vehicle wheels; the control unit is connected to the brake stroke detection unit and the motor, and controls the motor torque output according to the stroke signal detected by the brake stroke detection unit; the power supply unit is connected to the brake stroke detection unit, the control unit, and the motor, and is used to provide power energy supply.

[0019] In this embodiment, when the brake handle is squeezed, the braking states such as normal braking and emergency braking are matched according to the brake stroke opening, and the modes such as reducing torque output, disconnecting power, mechanical braking and power feedback are matched according to the brake stroke opening. This braking scheme combines the "clutch" function of oil-powered vehicles and the power feedback function of electric vehicles, which makes it easier to control the brake feel, meets some traditional driving habits of this type of vehicle and improves driving safety.

[0020] In this embodiment, the brake handle includes a fixing seat mounted on the vehicle, a handle rotatably connected to the fixing seat, and a torsion spring. The torsion spring is installed at the rotational connection position between the handle and the fixing seat to reset the handle.

[0021] In combination with the vehicle running status information, and based on the vehicle braking status information, the vehicle's torque adjustment parameters for the motor are determined, so that the vehicle is controlled according to the required power requirements, and the controller changes the power waveform of the inverter output, controls the speed and torque of the motor, and makes the brake control signal act on the output shaft end of the motor. The vehicle power can be in a state of reducing output torque, motor kinetic energy recovery and reverse drag, and motor reverse drag braking. Based on the construction of the oil circuit system for vehicle braking, the wheel brake system can respond to the master cylinder brake fluid action of the corresponding handle and cooperate with the braking scheme of the motor torque control application.

[0022] In this embodiment, when the brake handle is squeezed to brake, the brake opening is converted into an electrical signal to the controller. The controller controls the motor output according to the current vehicle status information, controls the motor to limit the output torque or perform reverse braking and power recovery, and triggers the brake lights to alert the following vehicles.

[0023] The brake handles include the front brake (right hand) and the rear brake (left hand). The brake signals of the brake handles on both sides are connected to the controller at the same time. The controller judges the collected signal status of the corresponding brake handles respectively, and controls the superimposed coordinated control of the motor torque according to the braking force curves corresponding to different brake handles.

[0024] When the rear brake handle is squeezed, the controller has the function of reducing the torque of the motor to 0 from the zero dead zone (initial position) to the middle section of the brake handle, and matches the mechanical brake trigger to the maximum braking force that can be achieved by the mechanical brake from the middle section to the maximum braking stroke of the brake handle. At the same time, this section of the process has the function of enabling the controller to reverse the torque of the motor and recover power. The execution motor control curve corresponding to this function can be freely set according to actual conditions. The brake lights are triggered in the braking stroke section to alert the following vehicle to meet safety requirements.

[0025] For vehicle versions with ABS braking system, the ABS braking system is connected to the control unit. When the vehicle needs to brake, the front section of the brake handle is the "clutch" function, and the rear section is the braking function. This system is connected to the ABS using a communication cable and oil circuit, in which the ABS module can detect the oil circuit pressure and, when working in conjunction with the vehicle posture control module, control the vehicle posture of the vehicle using this braking solution, making riding activities safer and more reliable.

[0026] In this version, when you squeeze the rear brake handle, the controller has the function of reducing the torque of the motor to 0 in the process from the zero dead zone (initial position) to the middle section of the brake handle, and matches the mechanical brake trigger to the maximum braking force that can be achieved by the mechanical brake from the middle section to the maximum braking stroke of the brake handle. At the same time, this section has the function of enabling the controller to reverse the torque of the motor and recover power. The execution motor control curve corresponding to this function can be freely set according to actual conditions, and the brake lights are triggered in the braking stroke section to alert the following vehicle; the added ABS braking system can collect the changes in the oil pressure signals of the master brake cylinders corresponding to the left and right brake handles when the vehicle brakes, and divides them into emergency braking, ordinary deceleration braking, stagnant uphill or starting on the spot, special venues, etc. according to the braking situation.

[0027] According to these braking scenarios and the corresponding vehicle speed and braking travel ratio, the corresponding braking force will be applied to the brake calipers or drum brakes on the brake pistons of the front and rear wheels; in special circumstances, such as when no oil pressure changes can be collected but the brake handle has travel changes in the braking range and other body sensors detect that the body needs to brake, the ABS controller directly executes the corresponding real-time braking force distribution to the front and rear wheels.

[0028] This embodiment can be applied to any vehicle that needs a handlebar brake, and to determine the vehicle state and perform brake control on the vehicle during the driving process. The vehicle is a vehicle that uses a handlebar brake, such as an electric bicycle, a power-assisted bicycle, an electric two-wheeled motorcycle, etc.

[0029] The front / rear brake handle integrated stroke detection module is connected to the motor controller via wired / wireless mode to obtain the stroke detection signal of the front and rear brake handles. The motor controller is connected to the motor via power cables and signal wires, and is used to drive the motor, detect the motor current, detect the motor position and vehicle speed, etc. The motor controller controls the motor output power and state so that the controller controls the acceleration and deceleration process of the vehicle. The front / rear brake handle and the corresponding front and rear brake master cylinders are connected to the corresponding front / rear brake modules through the front and rear brake oil circuits of the vehicle body, and the vehicle is braked by applying the target braking force to the wheel group.

[0030] In this example, a control method for such a vehicle control is provided, comprising the following steps: the controller obtains vehicle status information, usually, these parameters are various attribute information corresponding to the whole vehicle during driving, such as throttle value, front and rear brake values, driving speed, acceleration, angle, and some attribute information of the whole vehicle itself, such as mass, tire grip, etc. By squeezing the brake handle, the controller detects the travel change of the brake handle, and the corresponding travel curve in the first half of the travel controls the motor output torque to reduce until the torque is 0, and the corresponding travel curve in the second half of the travel controls the motor to recover power and reverse drag, and the greater the brake travel, the greater the reverse drag or power recovery.

[0031] Specifically, in actual installation, the rear section needs to be calibrated with the mechanical brake part according to actual conditions. The calibration requirements are that the braking force of the wheelset or the brake components connected to the wheelset transmission can be triggered at a stroke near the middle, and the mechanical brake force can reach the maximum braking force at the bottom stroke of the handlebar brake.

[0032] Specifically, when a driver is driving a two-wheeled electric vehicle, he can use various sensors of the two-wheeled electric vehicle, such as a speed sensor, an angle sensor, etc. to obtain vehicle status information during driving, and then obtain the vehicle status information obtained by using the sensors.

[0033] The present application has a "clutch" function that electric vehicles do not have, which can limit the maximum torque acting on the wheel set during driving of the electric motor; it can decouple the brake travel curve from the linear action of the brake caliper, and recouple the curve according to the driving scenario; it can self-learn the driver's braking and throttle usage habits, making the vehicle closer and closer to the driver's daily feel; it can monitor the braking status and connect with other vehicle components to have more application expansions; it can be compatible with the original gasoline vehicle driver habits and electric vehicle driver habits.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric vehicle braking system suitable for handlebar braking, characterized in that: Includes vehicle-mounted: Brake handle; A brake stroke detection unit, used to detect the brake handle pressing stroke; Brake assembly, used for braking vehicle wheels; A control unit connected to the brake stroke detection unit and the motor, and controlling the motor to reduce torque output and / or controlling the brake assembly to brake the vehicle wheel according to the stroke signal detected by the brake stroke detection unit; as well as A power supply unit is connected to the control unit and is used to provide electrical energy.

2. The electric vehicle braking system suitable for handlebar braking according to claim 1, characterized in that: The control unit controls the internal electronic devices according to the travel signal detected by the brake travel detection unit and the current state of the vehicle, and the electronic devices convert the output to control the motor to reduce the torque output or control the brake assembly and the motor to reversely brake the vehicle wheels.

3. The electric vehicle braking system applicable to handlebar braking according to claim 1, characterized in that: The pressing stroke of the brake handle is divided into a front stroke and a rear stroke. When the brake handle is in the front stroke, the control unit controls the motor to reduce the torque output; when the brake handle is in the rear stroke, the control unit controls the brake assembly and the motor to reversely brake the vehicle wheels.

4. The electric vehicle braking system suitable for handlebar braking according to claim 1, characterized in that: The pressing stroke of the brake handle is divided into a front stroke and a rear stroke. During the movement of the brake handle from the initial position to the end of the front stroke, the control unit controls the motor to gradually reduce the torque output; During the movement of the brake handle from the beginning of the rear stroke to the end of the rear stroke, the control unit controls the brake assembly and the motor to reversely increase the force of braking the vehicle wheels.

5. An electric vehicle braking system suitable for handlebar braking according to claim 3 or 4, characterized in that: When the pressing stroke of the brake handle is at the end of the front stroke, the control unit controls the motor to reduce the motor torque output to 0; when the pressing stroke of the brake handle is at the end of the rear stroke, the control unit controls the brake assembly and the motor to reverse to achieve maximum braking force.

6. An electric vehicle braking system suitable for handlebar braking according to claim 3 or 4, characterized in that: When the brake handle is in the rear stroke, the control unit controls the motor to reverse the torque and / or recover the power.

7. An electric vehicle braking system suitable for handlebar braking according to claim 3 or 4, characterized in that: When the brake handle is in the rear travel, the brake lights on the vehicle are triggered to light up.

8. An electric vehicle braking system suitable for handlebar braking according to claim 3 or 4, characterized in that: When the brake handle is in the rear travel, the control unit controls the brake lights on the vehicle to light up.

9. The electric vehicle braking system applicable to handlebar braking according to claim 1, characterized in that: The brake handle comprises a fixing seat mounted on the vehicle, a handle rotatably connected to the fixing seat, and a torsion spring. The torsion spring is mounted at the rotationally connected position between the handle and the fixing seat to reset the handle.

10. The electric vehicle braking system applicable to handlebar braking according to claim 1, characterized in that: The control unit may be equipped with an ABS braking system and connected to the ABS braking system via cables and oil circuits.