# US 10,766,472 B2 · ABS strategy for hybrid brake actuators

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- Number: US 10,766,472 B2
- Document ID: US10766472B2
- Status: Granted
- Kind: B2
- Application number: 15/742,916
- Filed: 2015-07-27
- Published: 2018-08-16
- Granted: 2020-09-08
- Earliest claimed: 2015-07-27
- Assignees: Volvo Truck Corporation
- Applicants: Volvo Truck Corporation
- Inventors: Lionel Farres; Christophe Long
- Web page: https://patentgrep.com/patent/US10766472B2

## CPC

- B60T 13/662: {characterised by specified functions of the control system components}
- B60T 7/22: initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle {, or by means of contactless obstacle detectors mounted on the vehicle}
- B60T 8/172: Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)}
- B60T 13/588: {both fluid and mechanical assistance or drive}
- B60T 13/683: {in pneumatic systems or parts thereof (in vacuum systems B60T13/72)}
- B60T 13/741: {acting on an ultimate actuator}
- B60T 2270/10: ABS control systems
- B60T 2270/20: ASR control systems
- B60T 2270/30: ESP control system
- F16D 2121/08: acting on a membrane-type actuator, e.g. for gas pressure
- F16D 2121/24: using motors
- 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
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A method of managing the braking force applied on the wheels of a vehicle including hybrid brake actuators is provided. In particular, safety functions, such as ABS and ESP are performed using hybrid actuators.

## Claims

### Claim 1

A method of managing a braking force on a wheel w of a vehicle v equipped with at least a pair of hybrid brake actuators and at least a control unit, each brake actuator comprising a first brake actuator and a second brake actuator, said method comprising the steps of:
determining, by the at least a control unit, a targeted braking force;
applying a main braking force to the wheel w by the first brake actuator;
applying a complementary braking force to the wheel w by a second brake actuator in such a way that the targeted braking force is actually delivered;
monitoring an actual braking force delivered to the wheel w; and
modulating one or more of the main braking force and the complementary braking force.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first brake actuator is a pneumatic actuator and the second brake actuator is an electric actuator.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the electric actuator is not reversible.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the targeted braking force is determined according to information transmitted by brake pedal sensors or other sensors selected from a sensor.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the main braking force is applied up to a given threshold, and wherein the complementary braking force is provided for a braking request above a value of the given threshold.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the main braking force and the complementary braking force are both applied at a constant ratio.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the actual braking force FD remains equal or below a maximum braking force Fmax, according to:
FD=E3a+E3b<Fmax
Wherein:
FD denotes the actual braking force effectively delivered;
E3a denotes the main braking force;
E3b denotes the complementary braking force; and
Fmax denotes the maximum braking force available by the pneumatic actuator alone.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the monitoring of the actual delivered braking force is performed by the mean of one or more of a rotation speed sensor of a wheel, a pressure sensor, a piston position sensor, and an electrical power consumption sensor.

### Claim 9 (depends on 2)

The method according to claim 2, wherein the electric actuator is activated or over-activated to compensate for a lack of braking strength of a pneumatic system on the wheel w.

### Claim 10 (depends on 1)

The method according to claim 1, wherein in absence of the main braking force, the electric actuator is automatically activated if a traveling speed of the vehicle v is too high with respect to an approaching obstacle.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the complementary braking force is applied before the main braking force.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the complementary braking force is controlled by a first electronic control unit (ECU) of the at least a control unit and the main braking force is controlled by a second ECU of the at least a control unit.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the main braking force may be equally modulated at several wheels, and wherein the complementary braking force is modulated at each wheel w independently.

### Claim 14 (depends on 1)

A vehicle comprising at least a pair of hybrid brake actuators, each brake actuator comprising a first brake actuator and a second brake actuator, and wherein a braking force is managed according to claim 1.