Search

WO-2026093390-A1 - METHOD FOR MONITORING A PHYSICAL PARAMETER OF A VEHICLE BATTERY

WO2026093390A1WO 2026093390 A1WO2026093390 A1WO 2026093390A1WO-2026093390-A1

Abstract

The invention relates to a method for monitoring a physical parameter of an item of equipment of a vehicle (1), in particular electric vehicle, the item of equipment comprising a plurality of sensors (34) electrically connected to an electronic control unit (36) and configured to measure a physical parameter, the electronic control unit (36) also comprising at least one pre-recorded threshold value and being configured to receive the measured values from the plurality of sensors (34) and to send a reference value of the physical parameter to a computer, the method comprising the following steps: - receiving the values of the parameter that are measured by the plurality of sensors (34), - calculating a reference value of the measured physical parameter, by interpolating the plurality of received values, - the computer (20) receiving and processing the calculated reference value, - the computer (20) activating functions of the vehicle (1) based on the received reference value.

Inventors

  • TROCME, Loïc
  • TISSERAND, Michael

Assignees

  • Schaeffler Technologies AG & Co. KG

Dates

Publication Date
20260507
Application Date
20251029
Priority Date
20241031

Claims (12)

  1. [Claim 1] A method for controlling a physical parameter of vehicle equipment (1), particularly of an electric vehicle, said vehicle (1) comprising said equipment, an electronic control unit (36, 48) and a computer (20), the equipment comprising a plurality of sensors (34, 46) electrically connected to said electronic control unit (36, 48) and configured to measure a physical parameter, the electronic control unit (36, 48) also comprising a memory area in which at least one threshold value is pre-recorded, the electronic control unit (36, 48) being configured to receive the values of the physical parameter measured by the plurality of sensors (34, 46) and to send a reference value of the physical parameter to the computer (20), said method comprising the steps of: - reception (E2), by the electronic control unit (36, 48), of the values of the physical parameter measured by the plurality of sensors (34, 46), - calculation (E3), by the electronic control unit (36, 48), of a reference value of the measured physical parameter, by comparing the received values to at least one pre-recorded threshold and in which: • if at least one received value exceeds the threshold, the reference value is determined to be equal to said measurement, • and if none of the values received by the plurality of sensors exceeds the pre-recorded threshold, the reference value is calculated as an interpolation of the plurality of received values, in which each value is weighted by a function of the difference between the values and at least one pre-recorded threshold, - sending, by the electronic control unit (36, 48), of the calculated reference value to the computer (20), - reception and processing, by the calculator (20), of the calculated reference value, - activation, by the computer (20), of vehicle functions (1) according to the reference value received.
  2. [Claim 2] A method for controlling a physical parameter of a vehicle equipment (1), according to the preceding claim, wherein said equipment is at least an electric battery (30).
  3. [Claim 3] Method of controlling a physical parameter of a vehicle equipment (1) according to claim 2, wherein the physical parameter is the temperature of the battery (30).
  4. [Claim 4] A method for controlling a physical parameter of a vehicle equipment (1) according to claim 2, wherein at least one battery (30) comprises a plurality of electrical cells (32), each electrical cell (32) being connected to an electrical charge sensor (34) and wherein the physical parameter is the charge level of each electrical cell (32).
  5. [Claim 5] Method of controlling a physical parameter of a vehicle equipment (1) according to claim 1, wherein said equipment is a rotating throttle handle (40), and the physical parameter is the rotation of said throttle handle (40).
  6. [Claim 6] Method of controlling a physical parameter of a vehicle equipment (1) according to any one of the preceding claims, wherein a plurality of thresholds are pre-recorded in the memory area of the electronic control unit (36, 48).
  7. [Claim 7] A method for controlling a physical parameter of a vehicle equipment (1) according to the preceding claim, wherein two thresholds are pre-recorded in the memory area, a high threshold and a low threshold, and wherein the determination of the reference value of the measured physical parameter consists of, if at least one value measured by a sensor is less than the low threshold or greater than the high threshold, taking as the reference value the corresponding measured value, and, if all the values measured by the plurality of sensors are between the low threshold and the high threshold, taking as the reference value an interpolation of the plurality of measured values, wherein each measured value is weighted by a function of the difference between said measured value and the low threshold and the high threshold.
  8. [Claim 8] A method for controlling a physical parameter of a vehicle equipment (1) according to any one of the preceding claims, wherein the interpolation of the plurality of measured values is a linear interpolation.
  9. [Claim 9] An electronic control unit (36, 48), particularly for electric vehicles, configured to be connected to a plurality of sensors (34, 46) of a physical parameter and to a computer (20), the electronic control unit (36, 48) comprising a memory area in which at least one threshold value is pre-recorded and being configured to: - receive the measured values of the sensor plurality parameter (34, 46), - compare each measured value received with at least one pre-recorded threshold and with other received values, - calculate an interpolation of the plurality of measured values, in which each measured value is weighted by a function of the difference between said measured value and at least one pre-recorded threshold, - determine a reference value from the measured values received, - send the reference value to the calculator (20).
  10. [Claim 10] Vehicle (1) comprising equipment, an electronic control unit (36, 48) according to the preceding claim and a computer (20), said equipment comprising a plurality of sensors (34, 46) for measuring a physical parameter connected to the electronic control unit (36, 48) and said electronic control unit (36, 48) being configured to implement the method according to any one of claims 1 to 8.
  11. [Claim 11] Vehicle (1) according to the preceding claim, wherein the equipment is at least one electric battery (30).
  12. [Claim 12] A vehicle according to the preceding claim, wherein the equipment is a throttle grip (40).

Description

Method for controlling a physical parameter of a vehicle battery DESCRIPTION [Technical field] [0001] The present invention relates to the field of vehicles and more particularly concerns a method of controlling a measured physical parameter. [Prior art] [0002] Today, more and more functions of commercial vehicles are performed by electronic components, requiring a power supply provided by one or more batteries. [0003] Batteries are increasingly used in vehicles with an electric motor, whether hybrid or fully electric. These vehicles can be four-wheeled (for motor vehicles) or two-wheeled. [0004] Due to the importance of batteries, it is important to control several physical parameters of said batteries in order to avoid premature wear and prevent potential safety risks. [0005] For example, if the battery temperature is too low, the battery may degrade more rapidly, and if the temperature is too high, the battery presents a risk to vehicle safety. [0006] To monitor the condition of the batteries, a set of measuring sensors is installed. For example, for temperature, several sensors can measure the temperature at different locations on the battery. The measurements taken by these sensors are sent to automated systems, such as control units, which activate different functions depending on the measurements received. For example, the control unit can reduce the torque supplied by the electric motor to limit power consumption if a battery has an abnormal temperature. [0007] With a plurality of sensors, for the sake of simplicity, it is preferable for the computer to receive a reference value for the measured physical parameter that synthesizes the plurality of measurements. An obvious way to synthesize this plurality of measurements is to calculate its average value. Thus, a single overall reference value is obtained. [0008] However, in the event of dispersion of the measurements, the calculation of the average may lead to neglecting extreme values of the measurements which would signify potential risks. [0009] Thus, if one sensor measures a high temperature at a point on the battery because overheating is occurring locally, but the others measure lower temperatures, the calculated average may remain close to a temperature considered normal. In this situation, the vehicle's computer does not activate a safety function, and the overheating may then spread and intensify before being detected. [0010] One solution is to add a comparison with one or more thresholds to the calculation of the average. In the previous example, if a single temperature is below or above one of these thresholds, the computer sends activation signals to safety systems even if the calculated average temperature remains within the range between the thresholds. [0011] This solution allows extreme values to be taken into account while calculating the average, but in addition to requiring the computer to take into account two additional values for the thresholds, it can cause a sudden jump for the vehicle's systems. [0012] Indeed, it is possible that an average value may be far from the thresholds while a sensor measures a rapid increase in temperature, which means that crossing the threshold by the measurement of this sensor suddenly triggers the sending of activation signals by the computer to the safety systems, which thus switch abruptly into a safety mode. [0013] There is therefore a need for a simple and effective solution to remedy at least some of these drawbacks. [Description of the invention] [0014] To this end, the invention first relates to a method for controlling a physical parameter of vehicle equipment, particularly of an electric vehicle, said vehicle comprising said equipment, an electronic control unit and a computer, the equipment comprising a plurality of sensors electrically connected to said electronic control unit and configured to measure a physical parameter, the electronic control unit also comprising a memory area in which at least one threshold value is pre-recorded, the electronic control unit being configured to receive the measured values of the physical parameter from the plurality of sensors and to send to the calculating a reference value for the physical parameter, said process comprising the steps of: [0015] - reception, by the electronic control unit, of the values of the physical parameter measured by the plurality of sensors, [0016] - calculation, by the electronic control unit, of a reference value of the measured physical parameter, by comparing the received values to at least one pre-recorded threshold and wherein: [0017] - if at least one received value crosses the threshold, the reference value is determined to be equal to said received value, [0018] - and if none of the values received by the plurality of sensors crosses the pre-recorded threshold, the reference value is calculated as an interpolation of the plurality of received values, in which each value is weighted by a function of the differen