US 12,071,042 B2
Method for determining the temperature of an active layer of a heating resistor
Maximilian Benkert, Munich (DE); and Egor Sawazki, Munich (DE)
Assigned to VITESCO TECHNOLOGIES GMBH, Hannover (DE)
Appl. No. 16/645,958
Filed by Vitesco Technologies GmbH, Hannover (DE)
PCT Filed Sep. 26, 2018, PCT No. PCT/EP2018/076068
§ 371(c)(1), (2) Date Mar. 10, 2020,
PCT Pub. No. WO2019/063591, PCT Pub. Date Apr. 4, 2019.
Claims priority of application No. 10 2017 217 194.4 (DE), filed on Sep. 27, 2017.
Prior Publication US 2020/0276901 A1, Sep. 3, 2020
Int. Cl. G01K 7/16 (2006.01); B60L 7/08 (2006.01); B60L 7/22 (2006.01); B60T 17/22 (2006.01); G01K 7/18 (2006.01)
CPC B60L 7/08 (2013.01) [B60L 7/22 (2013.01); B60T 17/22 (2013.01); G01K 7/183 (2013.01); G01K 7/16 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for operating a recuperation system of a motor vehicle having a heating resistor and a braking system, the method comprising:
determining an instantaneous value of a current flowing through an active layer of the heating resistor at a first time;
determining an instantaneous value of a voltage present on the active layer at the first time;
calculating an instantaneous value of an electrical resistance of the active layer based on the determined instantaneous value of the current and the determined instantaneous value of the voltage;
determining an instantaneous value of a temperature of the active layer from the calculated value of the electrical resistance;
determining a capacity of the active layer to absorb thermal energy based on the determined instantaneous value of the temperature of the active layer;
receiving an anticipated braking duration from the braking system;
determining an amount of energy to be generated by the braking system; and
if the amount of energy to be generated exceeds the determined capacity of the active layer, activating a friction brake of the recuperation system based on an amount of excess energy, else absorbing the energy generated in the heating resistor.