# US 2012/0074768 A1 · Vehicle brake system

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- Number: US 2012/0074768 A1
- Document ID: US20120074768A1
- Status: Published application
- Kind: A1
- Application number: 13/246,174
- Filed: 2011-09-27
- Published: 2012-03-29
- Earliest claimed: 2010-09-28
- Assignees: Advics Co., Ltd.
- Inventors: Masayuki Naito; Masahiro Matsuura; Akitaka Nishio
- Web page: https://patentgrep.com/patent/US20120074768A1

## CPC

- B60W 20/13: in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60L 3/0076: {relating to braking}
- B60L 7/14: for vehicles propelled by AC motors
- B60L 7/26: Controlling the braking effect
- B60L 15/2009: {for braking}
- B60L 50/16: with provision for separate direct mechanical propulsion
- B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors
- B60T 8/4059: {involving the rate of delivery}
- B60T 8/4872: {pump-back systems}
- B60T 13/586: {the retarders being of the electric type}
- B60T 13/686: {in hydraulic systems or parts thereof}
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/188: hydraulic brakes
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 30/18127: {Regenerative braking}
- B60L 2210/40: DC to AC converters
- B60L 2240/12: Speed
- B60L 2240/423: Torque
- B60L 2240/461: Speed
- B60L 2250/26: by pedal actuation
- B60T 2270/604: Merging friction therewith; Adjusting their repartition
- B60W 2540/12: Brake pedal position
- B60W 2710/083: Torque
- B60W 2710/18: Braking system
- B60W 2710/182: Brake pressure, e.g. of fluid or between pad and disc
- B60W 2720/406: between left and right wheel
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 10/72: Electric energy management in electromobility
- 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
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Vehicle brake system comprises a hydraulic brake device, a regenerative brake device to drive wheels driven by a generator-motor and a brake control device for cooperatively controlling the hydraulic brake force and the regenerative brake force in response to an operation amount of a brake operation member. This vehicle brake system further includes a differential amount calculating portion calculating a differential amount by subtracting a regeneration execution brake force obtained by execution of the generator-motor from a regeneration request brake force, a regenerative range judging portion for judging whether the regeneration request brake force is within a range of a re-generable brake force which is executable by the generator-motor and a hydraulic pressure restricting portion for restricting increase of the hydraulic brake force when the differential amount is a positive value and the regeneration request brake force is within the range of the re-generable brake force.

## Claims

### Claim 1

A vehicle brake system comprising:
a hydraulic brake device for applying hydraulic brake force to wheels of a vehicle;
a regenerative brake device for applying regenerative brake force to drive wheels among the wheels of the vehicle driven by a generator-motor; and
a brake control device for cooperatively controlling the hydraulic brake force of the hydraulic brake device and the regenerative brake force of the regenerative brake device in response to an operation amount of a brake operation member, wherein the brake control device includes;
a differential amount calculating means for calculating a differential amount by subtracting a regeneration execution brake force obtained by execution of the generator-motor from a regeneration request brake force obtained by command to the generator-motor;
a regenerative range judging means for judging whether or not the regeneration request brake force is within a range of a re-generable brake force which is executable by the generator-motor; and
a hydraulic pressure restricting means for restricting increase of the hydraulic brake force when the differential amount is judged to be a positive value and the regeneration request brake force is judged to be within the range of the re-generable brake force.

### Claim 2

A vehicle brake system comprising:
a hydraulic brake device for applying hydraulic brake force to wheels of a vehicle;
a regenerative brake device for applying regenerative brake force to drive wheels among the wheels of the vehicle driven by a generator-motor; and
a brake control device for cooperatively controlling the hydraulic brake force of the hydraulic brake device and the regenerative brake force of the regenerative brake device in response to an operation amount of a brake operation member, wherein the brake control device, upon decreasing a ratio of the regenerative brake force relative to a total target brake force determined by the operation amount of the brake operation member, includes;
a differential amount calculating means for calculating a differential amount by subtracting a regeneration execution brake force obtained by execution of the generator-motor from a regeneration request brake force obtained by command to the generator-motor;
a regenerative range judging means for judging whether or not the regeneration request brake force is within a range of a re-generable brake force which is executable by the generator-motor; and
a hydraulic pressure increasing means for increasing the hydraulic brake force when the differential amount is a negative value and the regeneration request brake force is within the range of the re-generable brake force.

### Claim 3 (depends on 1)

The vehicle brake system according to claim 1, wherein the brake control device is comprised of a hydraulic brake control portion for controlling the hydraulic brake device, a regenerative brake control portion for controlling the regenerative brake device and a telecommunication means through which the hydraulic brake control portion and the regenerative brake control portion are operatively connected with each other, wherein a time difference is generated at the hydraulic brake control portion between a request signal representing the regeneration request brake force and a signal of execution thereof representing the regeneration execution brake force caused by a telecommunication delay.

### Claim 4 (depends on 1)

The vehicle brake system according to claim 1, wherein the hydraulic brake device includes a master cylinder for generating a basic hydraulic pressure in response to the operation amount of the brake operation member, a pump for generating a controlled hydraulic pressure, and a hydraulic control unit for applying a basic hydraulic brake force corresponding to the basic hydraulic pressure and adding thereto a controlled hydraulic brake force corresponding to the controlled hydraulic pressure to the wheels of the vehicle, wherein the brake control device includes a pump restriction means for restricting the pump driving when the sum of the basic hydraulic brake force and the re-generable brake force exceeds the total target brake force determined by the operation amount of the brake operation member.

### Claim 5 (depends on 4)

The vehicle brake system according to claim 4, wherein the brake control device includes;
a regenerative brake capacity specifying means for specifying a regenerative brake capacity indicating the total amount of a re-generable brake force by the generator-motor at a certain point of time;
a re-generable slope specifying means for specifying a re-generable slope indicating a time rate of change of the re-generable brake force of the generator-motor at a certain point of time; and
a re-generable range estimating means for estimating a range of the re-generable brake force at the next point of time based on the regeneration request brake force or regeneration execution brake force, regenerative brake capacity and a re-generable slope at a certain point of time.

### Claim 6 (depends on 5)

The vehicle brake system according to claim 5, wherein the brake control device further includes a pump driving means for driving the pump when a predetermined condition is established.

### Claim 7 (depends on 6)

The vehicle brake system according to claim 6, wherein the predetermined condition is that the re-generable slope is smaller than a predetermined first slope.

### Claim 8 (depends on 6)

The vehicle brake system according to claim 6, wherein the predetermined condition is that a regenerative capacity which is obtained by subtracting the regeneration request brake force from the regenerative brake capacity is smaller than a predetermined capacity.

### Claim 9 (depends on 6)

The vehicle brake system according to claim 6, wherein the predetermined condition is that the regeneration request slope indicating the time rate of change of the regeneration request brake force is larger than a predetermined second slope.

### Claim 10 (depends on 1)

The vehicle brake system according to claim 1, wherein the brake control device includes a back-up means for increasing the hydraulic brake force when the regeneration execution brake force is not generated after a predetermined delay time elapsed after the regeneration request brake force is requested from the generator-motor.