US 11,910,579 B2
Determining the flow velocity in a coolant circuit
Ingolf Hoffmann, Herzogenaurach (DE); Horst Geyer, Erlangen (DE); and Abderrahim Chahid, Hemhofen (DE)
Assigned to Siemens Aktiengesellschaft, Munich (DE)
Appl. No. 17/414,798
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Nov. 25, 2019, PCT No. PCT/EP2019/082426
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/126330, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18213067 (EP), filed on Dec. 17, 2018.
Prior Publication US 2022/0022345 A1, Jan. 20, 2022
Int. Cl. H05K 7/20 (2006.01); G01F 1/69 (2006.01)
CPC H05K 7/20927 (2013.01) [G01F 1/69 (2013.01); H05K 7/20945 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for monitoring a coolant circuit, the method comprising:
cooling a conversion device giving rise to a power loss with a coolant flowing in the coolant circuit;
sending to a monitoring device as a measurement value an inflow temperature at which the coolant is supplied to the conversion device;
determining with the monitoring device a flow velocity at which the coolant flows in the coolant circuit based on operating data of the conversion device and/or the coolant circuit, a quantity of heat to be removed per unit of time by the coolant known to the monitoring device, a local temperature of the conversion device known to the monitoring device, and the inflow temperature;
comparing with the monitoring device the determined flow velocity with a limit velocity;
resorting with the monitoring device to a special reaction when the determined flow velocity reaches or exceeds the limit velocity; and
resorting with the monitoring device to either no reaction at all or to a normal reaction that is not the same as the special reaction as long as the determined flow velocity does not reach the limit velocity.