WO2021053629A1 - Braking system for an electric vehicle - Google Patents

Braking system for an electric vehicle Download PDF

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Publication number
WO2021053629A1
WO2021053629A1 PCT/IB2020/058755 IB2020058755W WO2021053629A1 WO 2021053629 A1 WO2021053629 A1 WO 2021053629A1 IB 2020058755 W IB2020058755 W IB 2020058755W WO 2021053629 A1 WO2021053629 A1 WO 2021053629A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
braking means
pressure
electric
vehicle
Prior art date
Application number
PCT/IB2020/058755
Other languages
French (fr)
Inventor
Bruno Vianello
Original Assignee
Texa S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Texa S.P.A. filed Critical Texa S.P.A.
Publication of WO2021053629A1 publication Critical patent/WO2021053629A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
    • B60L7/26—Controlling the braking effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/08—Brake-action initiating means for personal initiation hand actuated
    • B60T7/085—Brake-action initiating means for personal initiation hand actuated by electrical means, e.g. travel, force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
    • B60T8/1706—Braking or traction control means specially adapted for particular types of vehicles for single-track vehicles, e.g. motorcycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • B60W10/184—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
    • B60W10/188—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes hydraulic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18109—Braking
    • B60W30/18127—Regenerative braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/60—Regenerative braking
    • B60T2270/604—Merging friction therewith; Adjusting their repartition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2300/00—Indexing codes relating to the type of vehicle
    • B60W2300/36—Cycles; Motorcycles; Scooters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/18—Braking system
    • B60W2510/182—Brake pressure, e.g. of fluid or between pad and disc

Definitions

  • the invention refers - in general - to a braking and energy recovery system for a vehicle equipped with a propulsion electric motor.
  • the electric vehicle is an electric bicycle.
  • a braking system is then presented for electric vehicle, in particular a bicycle assisted by a propulsion electric motor, the vehicle comprising an electric motor to move the vehicle relative to the ground and a wheel equipped with friction braking means acting on the wheel, wherein said means are driven through a fluid, the system comprising an element operable by a user to brake the vehicle proportionally to a displacement of the element, a hydraulic circuit to drive the braking means, the circuit comprising a fluid whose pressure is variable (e.g.
  • an electronic circuit or board configured (e.g. programmed via a microprocessor) to detect a change in pressure of the fluid (thus indirectly monitoring a movement of the operable element) and control the electric motor and braking means so that at an initial change in the pressure of the fluid (e.g. an increase) the motor functions as an electric generator and the braking merns are inactive, and with an additional pressure variation (e.g. an additional increase) the braking means are activated.
  • the fluid pressure detection makes the discrimination between the instants of intervention of the motor or the brakes very precise and/or easily programmable. Moreover, through the detected pressure it is possible to calculate or estimate indirectly the positional variation of the element operable by the user, avoiding dedicated sensors to detect such positional variation.
  • the system comprises an electric battery to supply the electric motor and to store the electric power generated by the electric motor.
  • the fluid circuit to send a pressurized fluid (e.g. oil) to the braking means to activate them, is open, i.e. configured e.g. to convey fluid from a fluid tank to the braking means or to displace fluid back and forth to and from the braking means without a closed circuit of fluid.
  • a pressurized fluid e.g. oil
  • the system comprises a sensor to detect a change in the fluid pressure, and thus a displacement of the user-operable element; the sensor is a fluid pressure sensor.
  • the user-operable element is a lever configured to increase the fluid pressure at an inlet of the hydraulic circuit and said pressure sensor is configured to detect the fluid pressure at said inlet.
  • the hydraulic circuit comprises a valve configured to let fluid pass to the braking means only if the fluid pressure varied via the operable element is different from a threshold pressure, in particular only if the fluid pressure increased via the operable element is higher than a threshold pressure.
  • the hydraulic circuit comprises an antagonistic element to create an opposite pressure to that of the fluid in order to determine an activation threshold of the braking means.
  • the antagonist element is preferably an elastic element, e.g. a spring.
  • the antagonist element is mounted in contact with an element that is inserted in the hydraulic circuit to receive fluid under pressure and to push fluid towards the braking means.
  • the element to receive the fluid under pressure and push it towards the braking means comprises - or consists of - a membrane or a separating wall, the membrane or separating wall having two opposite surfaces in contact with fluid: a surface receives fluid under pressure pushed by the operable element and a surface pushes fluid towards the braking means.
  • an electric vehicle in particular a bicycle assisted by a propulsion electric motor, which comprises an electric motor to move the vehicle relative to the ground, a wheel equipped with friction braking means acting on the wheel, a braking system as defined in one or each of the above defined variants.
  • a method for braking an electric vehicle in particular a bicycle assisted by a propulsion electric motor and equipped with friction braking means acting on a wheel and operating by means of a pressurized fluid, with the steps of detecting a change in the fluid pressure induced by a user-operable element, the element being operable to brake the vehicle proportionally to a displacement of the element, and controlling the electric motor and braking means so that at an initial increase in the fluid pressure the motor functions as an electric generator and the braking means are inactive, and with a further increase in the fluid pressure, only or also the braking means are activated.
  • - Fig. 1 shows a first principle diagram of a braking system
  • - Fig. 2 shows a second principle diagram of a braking system.
  • the system MC1 shown in Fig. 1 is used to friction brake the rotation of a wheel 40 of a vehicle, e.g. a bicycle, also driven by an electric motor 18.
  • a battery to supply the motor 18 and/or store the energy generated by the motor 18 during braking.
  • the vehicle comprises an element 10 by which to brake the wheel 40 by e.g. driving jaws 42.
  • the element 10 comprises or consists of a lever 12.
  • the lever 12 is connected to a piston 22 adapted to pressurize a fluid inside a circuit 20 that carries the fluid under pressure to the jaws 42 to brake the wheel 40. Downstream the piston 22 is a sensor 24 to detect the fluid pressure at that point in the circuit 20.
  • the circuit 20 comprises a valve 26 calibrated to open, and therefore to pass the fluid to the jaws 42, only when the fluid pressure at its inlet exceeds a certain threshold.
  • An electronic circuit 16 controls the operation of the motor 18 and is connected to the sensor 24 to detect an output signal thereof.
  • the operation of the system MC1 is as follows.
  • the lever 12 operates the piston 22 and progressively increases the fluid pressure inside the circuit 20. This pressure increase is detected by the circuit 16 via the sensor 24.
  • the pressure threshold in the valve 26 is set to a value greater than an initial pressure increase in the circuit 20, such initial pressure increase is not sufficient to open the valve 26, so the jaws activate. Instead, the electronic circuit 16 immediately detects a pressure variation and controls the operation of the motor 18 so that it behaves as a generator, providing a braking torque on the wheel 40, in particular a braking torque proportional to the detected pressure.
  • the electronic circuit 16 controls the operation of the motor 18 so that the motor 18 still behaves as a generator, in particular charging the battery in proportional manner to the pressure of the lever 12 and obtaining a consequent braking action.
  • valve 26 in the system MC1 may be complicated to produce or calibrate in some cases.
  • a different delay element to activate the jaws 42 i.e. a diaphragm separator 50.
  • the diaphragm separator 50 comprises a membrane 52 on which a spring 54 acts to counteract the pressure induced by the lever 12 in the circuit 20.
  • the pressure downstream the separator 50 increases quite linearly as the lever 12 is moved, so that the jaws 42 are activated slowly and become effective in braking only after the pressure in the circuit 20 has increased by a certain value.
  • the system MC2 also avoids the undesired possibility of jerking operation of the jaws 42 due to the valve 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Braking Systems And Boosters (AREA)
  • Braking Arrangements (AREA)
  • Regulating Braking Force (AREA)

Abstract

A braking system (MC1; MC2) for an electric vehicle is described, in particular a bicycle assisted by an electric propulsion motor, wherein the vehicle comprises an electric motor (18) for moving the vehicle with respect to the ground and a wheel equipped with friction braking means (42) acting on the wheel and controlled via fluid. An electronic circuit (16) detects a pressure change of the fluid and controls the electric motor and the braking means so that at an initial change in fluid pressure the motor works as an electric generator and the braking means are inactive, and with an additional pressure change the braking means are activated.

Description

BRAKING SYSTEM FOR AN ELECTRIC VEHICLE
The invention refers - in general - to a braking and energy recovery system for a vehicle equipped with a propulsion electric motor. In particular, the electric vehicle is an electric bicycle.
It is known to recover the kinetic energy of an electric vehicle while it is braking. Instead of dissipating the energy with the friction of the brakes, the electric motor is used as a generator to recharge the power-supply batteries. In the case of an electric motor-assisted bicycle, for example, it is convenient that there is cooperation between the classic friction brakes and the brake by means of the electric motor.
Therefore, it is desired to propose a system and method to manage the coordinated operation between electric motor and brakes, wherein the system and/or method is defined as in the attached claims, in which the dependent ones define advantageous variants. A braking system is then presented for electric vehicle, in particular a bicycle assisted by a propulsion electric motor, the vehicle comprising an electric motor to move the vehicle relative to the ground and a wheel equipped with friction braking means acting on the wheel, wherein said means are driven through a fluid, the system comprising an element operable by a user to brake the vehicle proportionally to a displacement of the element, a hydraulic circuit to drive the braking means, the circuit comprising a fluid whose pressure is variable (e.g. it can be increased) by means of a displacement of the operable element, an electronic circuit or board configured (e.g. programmed via a microprocessor) to detect a change in pressure of the fluid (thus indirectly monitoring a movement of the operable element) and control the electric motor and braking means so that at an initial change in the pressure of the fluid (e.g. an increase) the motor functions as an electric generator and the braking merns are inactive, and with an additional pressure variation (e.g. an additional increase) the braking means are activated.
The fluid pressure detection makes the discrimination between the instants of intervention of the motor or the brakes very precise and/or easily programmable. Moreover, through the detected pressure it is possible to calculate or estimate indirectly the positional variation of the element operable by the user, avoiding dedicated sensors to detect such positional variation.
Preferably, the system comprises an electric battery to supply the electric motor and to store the electric power generated by the electric motor.
Preferably, the fluid circuit, to send a pressurized fluid (e.g. oil) to the braking means to activate them, is open, i.e. configured e.g. to convey fluid from a fluid tank to the braking means or to displace fluid back and forth to and from the braking means without a closed circuit of fluid. Preferably the system comprises a sensor to detect a change in the fluid pressure, and thus a displacement of the user-operable element; the sensor is a fluid pressure sensor.
Preferably, the user-operable element is a lever configured to increase the fluid pressure at an inlet of the hydraulic circuit and said pressure sensor is configured to detect the fluid pressure at said inlet.
Preferably, the hydraulic circuit comprises a valve configured to let fluid pass to the braking means only if the fluid pressure varied via the operable element is different from a threshold pressure, in particular only if the fluid pressure increased via the operable element is higher than a threshold pressure. Preferably, the hydraulic circuit comprises an antagonistic element to create an opposite pressure to that of the fluid in order to determine an activation threshold of the braking means. The antagonist element is preferably an elastic element, e.g. a spring.
In a variant, the antagonist element is mounted in contact with an element that is inserted in the hydraulic circuit to receive fluid under pressure and to push fluid towards the braking means. More specifically, the element to receive the fluid under pressure and push it towards the braking means comprises - or consists of - a membrane or a separating wall, the membrane or separating wall having two opposite surfaces in contact with fluid: a surface receives fluid under pressure pushed by the operable element and a surface pushes fluid towards the braking means. There is also presented an electric vehicle, in particular a bicycle assisted by a propulsion electric motor, which comprises an electric motor to move the vehicle relative to the ground, a wheel equipped with friction braking means acting on the wheel, a braking system as defined in one or each of the above defined variants. There is also presented a method for braking an electric vehicle, in particular a bicycle assisted by a propulsion electric motor and equipped with friction braking means acting on a wheel and operating by means of a pressurized fluid, with the steps of detecting a change in the fluid pressure induced by a user-operable element, the element being operable to brake the vehicle proportionally to a displacement of the element, and controlling the electric motor and braking means so that at an initial increase in the fluid pressure the motor functions as an electric generator and the braking means are inactive, and with a further increase in the fluid pressure, only or also the braking means are activated..
The advantages of the invention will be clearer from the following description of a preferred embodiment, referring to the attached drawing in which
- Fig. 1 shows a first principle diagram of a braking system, - Fig. 2 shows a second principle diagram of a braking system.
Equal numbers in the figures indicate equal parts.
The system MC1 shown in Fig. 1 is used to friction brake the rotation of a wheel 40 of a vehicle, e.g. a bicycle, also driven by an electric motor 18.
In the diagrams shown there may be a battery to supply the motor 18 and/or store the energy generated by the motor 18 during braking.
The vehicle comprises an element 10 by which to brake the wheel 40 by e.g. driving jaws 42. In the case of the bicycle, the element 10 comprises or consists of a lever 12.
The lever 12 is connected to a piston 22 adapted to pressurize a fluid inside a circuit 20 that carries the fluid under pressure to the jaws 42 to brake the wheel 40. Downstream the piston 22 is a sensor 24 to detect the fluid pressure at that point in the circuit 20.
Between the piston 22 and the jaws 42 the circuit 20 comprises a valve 26 calibrated to open, and therefore to pass the fluid to the jaws 42, only when the fluid pressure at its inlet exceeds a certain threshold. An electronic circuit 16 controls the operation of the motor 18 and is connected to the sensor 24 to detect an output signal thereof.
The operation of the system MC1 is as follows.
When the user wants to brake the wheel 40, he acts on the lever 12 to move it.
The lever 12 operates the piston 22 and progressively increases the fluid pressure inside the circuit 20. This pressure increase is detected by the circuit 16 via the sensor 24.
Since the pressure threshold in the valve 26 is set to a value greater than an initial pressure increase in the circuit 20, such initial pressure increase is not sufficient to open the valve 26, so the jaws activate. Instead, the electronic circuit 16 immediately detects a pressure variation and controls the operation of the motor 18 so that it behaves as a generator, providing a braking torque on the wheel 40, in particular a braking torque proportional to the detected pressure.
When the lever 12 increases the pressure of the fluid inside the circuit 20 so that the pressure threshold in the valve 26 is exceeded, the valve 26 opens and the jaws activate pushed by the fluid, therefore with a certain delay compared to the braking action of the motor 18. At this point the braking action of the electric motor adds to the action of the mechanical brake.
During the activation of the jaws 42 the electronic circuit 16 controls the operation of the motor 18 so that the motor 18 still behaves as a generator, in particular charging the battery in proportional manner to the pressure of the lever 12 and obtaining a consequent braking action.
When the lever 12 is released, the fluid assumes the initial configuration, traveling backward in the circuit 20 through a unidirectional free valve 32. The valve 26 in the system MC1 may be complicated to produce or calibrate in some cases.
Then the variant of the system MC2 shown in Fig. 2 can be used, wherein the valve 26 is replaced by a different delay element to activate the jaws 42, i.e. a diaphragm separator 50. The diaphragm separator 50 comprises a membrane 52 on which a spring 54 acts to counteract the pressure induced by the lever 12 in the circuit 20.
The pressure downstream the separator 50 increases quite linearly as the lever 12 is moved, so that the jaws 42 are activated slowly and become effective in braking only after the pressure in the circuit 20 has increased by a certain value. The system MC2 also avoids the undesired possibility of jerking operation of the jaws 42 due to the valve 26.

Claims

1. Braking system (MC1 ; MC2) for an electric vehicle, in particular a bicycle assisted by an electric propulsion motor, the vehicle comprising an electric motor (18) for moving the vehicle with respect to the ground and a wheel equipped with friction braking means (42) acting on the wheel, the system comprising an element (12) operable by a user to brake the vehicle proportionally to a displacement of the element, a hydraulic circuit for driving the braking means, the circuit comprising a fluid whose pressure is variable through a displacement of the operable element (12), an electronic circuit (16) configured to detect a pressure change of the fluid and control the electric motor and the braking means so that at an initial change in fluid pressure the motor works as an electric generator and the braking means are inactive, and with an additional pressure change the braking means are activated.
2. System according to claim 1, wherein the hydraulic circuit, for sending a fluid under pressure to the braking means to activate them, is open.
3. System according to any previous claim, comprising a sensor (24) for detecting a pressure change of the fluid.
4. System according to any previous claim, wherein the element operable by a user is a lever configured to increase the pressure of the fluid at an inlet of the hydraulic circuit.
5. System according to any previous claim, wherein the hydraulic circuit comprises a valve configured to let fluid pass to the braking means only if the fluid pressure changed by means of the actuable element is different from a threshold pressure.
6. System according to any previous claim, wherein the hydraulic circuit comprises an antagonist element for creating an opposite pressure to that of the fluid in order to determine an activation threshold of the braking means.
7. System according to claim 6, wherein the antagonist element is mounted in contact with an element which is inserted in the hydraulic circuit to receive pressurized fluid and to push fluid towards the braking means.
8. System according to Claim 7, wherein the element for receiving the pressurized fluid and pushing it towards the braking means comprises - or consists of - a membrane or a separating wall, the membrane or separating wall having two opposite surfaces in contact with fluid: a first surface for receiving pressurized fluid pushed by the actuable element and a second surface for pushing fluid towards the braking means.
9. Electric vehicle, in particular a bicycle assisted by an electric propulsion motor, comprising an electric motor for moving the vehicle with respect to the ground, a wheel equipped with friction braking means acting on the wheel, a braking system as defined in one or each of the preceding claims.
10. Method for braking an electric vehicle, in particular a bicycle assisted by an electric propulsion motor and provided with friction braking means acting on a wheel and operating through a pressurized fluid, with the steps of detecting a pressure change of the fluid induced by a user-operable element, the element being operable to brake the vehicle proportionally to a displacement of the element, and controlling the electric motor and the braking means so that at an initial pressure increase of the fluid the motor works as an electric generator and the braking means are inactive, and with a further increase of the fluid pressure only or also the braking means are activated.
PCT/IB2020/058755 2019-09-20 2020-09-19 Braking system for an electric vehicle WO2021053629A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000016874A IT201900016874A1 (en) 2019-09-20 2019-09-20 "Braking system for electric vehicle"
IT102019000016874 2019-09-20

Publications (1)

Publication Number Publication Date
WO2021053629A1 true WO2021053629A1 (en) 2021-03-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110233994A1 (en) * 2010-03-29 2011-09-29 Electric Vehicle Manufacturing, LLC System And Method To Control Regenerative Braking
DE102011001095A1 (en) * 2010-04-11 2011-10-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Bicycle comprises electrical auxiliary drive, which has electric machine that is operated as generator and as electromotor, and accumulator for storing electrical power, which is connected with electric machine
US20110304198A1 (en) * 2010-06-11 2011-12-15 Cottrell V Daniel D Method for controlling regenerative and hydraulic braking
US9969374B2 (en) * 2013-05-31 2018-05-15 Ford Global Technologies, Llc Control and delivery of hydraulic fluid in vehicle braking system
EP3392104A1 (en) * 2015-12-18 2018-10-24 Robert Bosch GmbH Hydraulic brake system, bicycle, and method for controlling hydraulic brake system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110233994A1 (en) * 2010-03-29 2011-09-29 Electric Vehicle Manufacturing, LLC System And Method To Control Regenerative Braking
DE102011001095A1 (en) * 2010-04-11 2011-10-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Bicycle comprises electrical auxiliary drive, which has electric machine that is operated as generator and as electromotor, and accumulator for storing electrical power, which is connected with electric machine
US20110304198A1 (en) * 2010-06-11 2011-12-15 Cottrell V Daniel D Method for controlling regenerative and hydraulic braking
US9969374B2 (en) * 2013-05-31 2018-05-15 Ford Global Technologies, Llc Control and delivery of hydraulic fluid in vehicle braking system
EP3392104A1 (en) * 2015-12-18 2018-10-24 Robert Bosch GmbH Hydraulic brake system, bicycle, and method for controlling hydraulic brake system

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