Electrical Flow Heater for a Vehicle, in Particular an Electric Vehicle, Operating Method for the Flow Heater and Vehicle

Patent metadata

Field	Value
Publication number	US-2026061800-A1
Application number	US-202319103411-A
Country	US
Kind code	A1
Filing date	Oct 10, 2023
Priority date	Nov 9, 2022
Publication date	Mar 5, 2026
Grant date	—

Abstract

A method is provided for operating an electrical flow heater in a vehicle, in particular an electric vehicle, wherein the flow heater has multiple electrical heating circuits for electrically generating a respective heating power in a heating section through which a medium to be heated flows, and a power control of the respective heating power of the respective heating circuit is carried out by a control circuit by controlling a respective controllable electrical switch element of the respective heating circuit. A sum of the heating powers is adjusted to a total heating power. With the control circuit, a distribution of the total heating power into the heating powers of the heating circuits is carried out according to configuration data, wherein the configuration data is independent of a current temperature of the medium to be heated.

First claim

1 .- 15 . (canceled)

16 . A method for operating an electric flow heater in a vehicle, wherein the flow heater comprises multiple electrical heating circuits for electrical generation of a respective heating power in a heating section through which a medium which is to be heated flows, the method comprising:
actuating, via a control circuit, a respective controllable electrical switching element of the respective heating circuit, in order to execute a power control of the respective heating power of the respective heating circuit, wherein a sum of the heating powers is adjusted to a total heating power, wherein the control circuit executes a distribution of a total heating power into the heating powers of the heating circuits, in accordance with configuration data, wherein the distribution, which is defined by the configuration data, is independent of current temperature of the medium which is to be heated.

17 . The method according to claim 16 , wherein
the configuration data of the control circuit are permanently stipulated, or are modified during operation of the control circuit, or a selection of different configuration data is executed by the control circuit, depending upon a current operating situation detected, and the actuation of heating circuits is executed in accordance with the configuration data selected.

18 . The method according to claim 16 , wherein, via the configuration data, a condition for actuating the switching elements is stipulated by the control circuit, which dictates a respective upper limit for the heating power of one, a number, or each of the heating circuits.

19 . The method according to claim 16 , wherein, via the configuration data, a condition which is to be fulfilled by the control circuit is stipulated which provides for a coordinated switching of the switching elements of at least two of the heating circuits, the electrical heating lines of which are arranged in the flow heater in direct mutual proximity, wherein
coordinated switching provides for a dependence of the heating power and/or a circuit state of one of the heating circuits which is switched in a coordinated manner upon the heating power and/or circuit state of another of the heating circuits which is switched in a coordinated manner.

20 . The method according to claim 16 , wherein, via the configuration data, a condition which is to be fulfilled by the control circuit is stipulated which dictates a synchronized switching.

21 . The method according to claim 20 , wherein the synchronized switching is a staggered and/or phase-displaced switching of at least two of the switching elements.

22 . The method according to claim 21 , wherein
the phase-displaced switching is dictated for such heating circuits, the electrical heating lines of which and/or the electric power supply lines of which are arranged in immediate mutual proximity.

23 . The method according to claim 20 , wherein, via the control circuit, actuation of the switching elements is executed in the form of a pulse-width modulation (PWM) and, via the configuration data, synchronized switching is dictated for all, or only for a number of switching frequencies which are provided for PWM.

24 . The method according to claim 16 , wherein
the configuration data provide for different installation positions and/or spatial installation locations of the flow heater in the vehicle and/or for different distributions of the total heating power for different vehicle models, and, via the control circuit, said configuration data are selected as are provided for the actual installation position and/or installation location of the flow heater, and actuation is executed according to the configuration data selected.

25 . The method according to claim 16 , wherein
the control circuit executes a different setting of the distribution of the total heating power and/or a different actuation of switching elements, according to configuration data for different operating states of the flow heater, which different operating states are distinguished with respect to flow conditions of the medium, and/or for different operating modes, which different operating modes are distinguished with respect to a fluidic coupling of the heating section with different vehicle components of the vehicle.

26 . The method according to claim 16 , wherein, via the control circuit, in accordance with the configuration data, the distribution of the total heating power and/or the actuation of switching elements is executed based on a respective operating history, which operating history indicates an age and/or hours of service and/or a total quantity of energy converted by the respective heating circuit.

27 . The method according to claim 16 ,
wherein, via the configuration data for different potential operating situations which are continuously and/or presently provided for the flow heater in the vehicle, differing proportional components of the respective heating power in the total heating power and/or upper power limits for one or more, or for all of, the heating circuits are dictated and, via the control circuit, situation data are ascertained which indicate the actual operating situation, and actuation is executed in accordance with the associated configuration data, and/or wherein configuration data incorporate a code flag, according to the state of which a control is executed to the effect that distribution is only activated in accordance with a vehicle parameter logic, with respect to a national version, a target market, material variants of the heating plates and/or in consideration of a dedicated cold climate vehicle.

28 . The method according to claim 27 , wherein
the situation data are ascertained from an on-board communication network to which the control circuit is coupled, and/or by a sensor circuit of the flow heater.

29 . The method according to claim 16 , wherein
the control circuit, further to an employment of configuration data and in a servicing mode, receives new configuration data, and the configuration data are entirely or partially replaced and/or expanded by the new configuration data received.

30 . An electrical flow heater, comprising:
multiple electrical heating circuits, each of which is connected via a respective and controllable electric switching element to a terminal apparatus for supplying electrical energy to the respective heating circuit; a control circuit of the flow heater for power control of electric power which is converted via the switching elements in the respective heating circuit, wherein the control circuit is operatively configured to:
actuate, via a control circuit, a respective controllable electrical switching element of the respective heating circuit, in order to execute a power control of the respective heating power of the respective heating circuit, wherein a sum of the heating powers is adjusted to a total heating power, wherein
the control circuit executes a distribution of a total heating power into the heating powers of the heating circuits, in accordance with configuration data, wherein the distribution, which is dictated by the configuration data, is independent of current temperature of the medium which is to be heated is designed for executing a method according to one of the preceding claims.

31 . A vehicle comprising an electrical flow heater according to claim 30 .

32 . The vehicle according to claim 31 , wherein the vehicle is an electric vehicle.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Hoedl Johannes

Classifications

• H05B2203/005

  using multiple resistive elements or resistive zones isolated from each other · CPC title

• H05B1/0236

  for vehicles · CPC title

• H03K3/017

  Adjustment of width or dutycycle of pulses (pulse width modulation H03K7/08 {; to maintain energy constant H03K3/015}) · CPC title

• B60H1/2221

  arrangements of electric heaters for heating an intermediate liquid (B60H1/034 takes precedence) · CPC title

• B60H1/00392

  for electric vehicles having only electric drive means · CPC title