Method for estimating a measure of the friction coefficient between the stator and the rotor in a braking device
AssigneeVolvo Lastvagnar AB
InventorJan-Inge SVENSSON
Life of this patent
Estimating the term…
Abstract
A method for estimating the friction coefficient between the stator and the rotor in a braking device including the following method steps: measurement of the temperature of the braking device, establishment of the friction coefficient by calculating the relationship between a measure of thermal energy generated by the rotor and the stator during a time interval and a measure of braking energy absorbed by the rotor and the stator during the same time interval, in which the generated thermal energy is calculated from a function of the measured temperature. The method is preferably used in calculating a correction factor for trailer compensation.
Claims20
A method for estimating a measure of the friction coefficient (μ) between the stator (29) and the rotor (28) in a braking device (8) of a vehicle, said method comprising:
- measuring (100) the temperature (T) of the braking device;
- and
- calculating (130) a friction coefficient (μ) from the relationship between a measure of thermal energy (110) generated by the rotor and the stator during a time interval and a measure of braking energy (120) absorbed by the rotor and the stator during the same time interval, said generated thermal energy (110) being calculated as a function of said measured temperature (T).
An arrangement for estimating a measure of the friction coefficient between the stator (29) and the rotor (28) in a braking device (8) of a vehicle comprising:
- a temperature sensor (15) for measuring the temperature (T) of the braking device (8);
- and
- means (11) for establishing the friction coefficient (μ) from a calculation (130) of the relationship between a measure (110) of thermal energy generated by the rotor and the stator during a time interval and a measure (120) of braking energy absorbed by the rotor and the stator during the same time interval, wherein said establishing means calculates the generated thermal energy as a function of said measured temperature (T).
An arrangement for estimating a measure of the friction coefficient between the stator (29) and the rotor (28) in a braking device (8) of a vehicle, said arrangement comprising:
- a temperature sensor (15) that measures the temperature (T) of a braking device (8) of a vehicle;
- and
- a computer processor (11) programmed with a control program that determines a friction coefficient (μ) from a calculation (130) of a relationship between a measure (110) of thermal energy generated by the rotor and the stator of the braking device (8) during a time interval and a measure (120) of braking energy absorbed by the rotor and the stator during the same time interval and wherein the control program calculates the generated thermal energy as a function of said measured temperature (T).
A control unit for estimating a measure of the friction coefficient (μ) between the stator (29) and the rotor (28) in a braking device (8) of a vehicle comprising a temperature sensor (15) for measuring the temperature (T) of the braking device (8) and a computer program that calculates a friction coefficient therefrom.
Dependencies are inferred from the claim text.