Method and arrangement for measuring and estimating a brake factor in a vehicle brake system
First Claim
1. A method for measuring and estimating a brake factor in a vehicle brake system, the vehicle comprising a towing vehicle and a trailer having a plurality of wheel axles, comprising:
- initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle; and
obtaining values representing the brake factor for the first wheel axle and the second wheel axle by means of a control unit which is provided with a brake adaptation function to obtain a brake balance between the towing vehicle and the trailer;
braking, in a forced manner, the first wheel axle when retardation of the vehicle is requested;
estimating the brake factor for the first wheel axle by determining the brake pressure and braking torque for the first wheel axle;
providing a transition phase after which the second wheel axle is braked, in a forced manner; and
estimating the brake factor for the second wheel axle by determining the brake pressure and braking torque for the second wheel axle.
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Accused Products
Abstract
The invention relates to a method for measuring and estimating a brake factor in a vehicle brake system, said vehicle including a towing vehicle and a trailer having a plurality of wheel axles, wherein said method includes: initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle; and obtaining values representing said brake factor for said wheel first wheel axle and said second wheel axle by a control unit which is provided with a brake adaptation function to obtain a brake balance between said towing vehicle and said trailer. The method furthermore includes: braking, in a forced manner, said first wheel axle when retardation of said vehicle is requested; estimating the brake factor for said first wheel axle by determining the brake pressure and braking torque for said first wheel axle; providing a transition phase after which said second wheel axle is braked, in a forced manner, and estimating the brake factor for said second wheel axle by determining the brake pressure and braking torque for said second wheel axle. An arrangement for measuring and estimating the brake factor in a vehicle brake system is also disclosed.
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Citations
7 Claims
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1. A method for measuring and estimating a brake factor in a vehicle brake system, the vehicle comprising a towing vehicle and a trailer having a plurality of wheel axles, comprising:
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initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle; and obtaining values representing the brake factor for the first wheel axle and the second wheel axle by means of a control unit which is provided with a brake adaptation function to obtain a brake balance between the towing vehicle and the trailer; braking, in a forced manner, the first wheel axle when retardation of the vehicle is requested; estimating the brake factor for the first wheel axle by determining the brake pressure and braking torque for the first wheel axle; providing a transition phase after which the second wheel axle is braked, in a forced manner; and estimating the brake factor for the second wheel axle by determining the brake pressure and braking torque for the second wheel axle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for measuring and estimating a brake factor in a vehicle brake system, the vehicle comprising a towing vehicle and a trailer having a plurality of wheel axles, wherein the device furthermore comprises:
- a control unit adapted for initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle, and for obtaining values representing the brake factor for the first wheel axle and the second wheel axle, the control unit being provided with a brake adaptation function to obtain a brake balance between the towing vehicle and the trailer;
wherein the control unit furthermore is adapted for carrying out a braking, in a forced manner, of the first wheel axle when retardation of the vehicle is requested, for estimating the brake factor for the first wheel axle by determining the brake pressure and braking torque for the first wheel axle, for providing a transition phase after which the second wheel axle is braked, in a forced manner, and for estimating (20) the brake factor for the second wheel axle by determining the brake pressure and braking torque for the second wheel axle.
- a control unit adapted for initiating a controlled braking manoeuvre involving at least a first wheel axle and a second wheel axle, and for obtaining values representing the brake factor for the first wheel axle and the second wheel axle, the control unit being provided with a brake adaptation function to obtain a brake balance between the towing vehicle and the trailer;
Specification