How to calculate the braking power of the electric motor

EP2896544A2 - Method for determining the vehicle mass or the vehicle weight of an electric vehicle or an electric hybrid vehicle, device and vehicle - Google Patents

Method for determining the vehicle mass or the vehicle weight of an electric vehicle or an electric hybrid vehicle, device and vehicle Download PDF

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Publication number
EP2896544A2
EP2896544A2EP14192963.8AEP14192963AEP2896544A2EP 2896544 A2EP2896544 A2EP 2896544A2EP 14192963 AEP14192963 AEP 14192963AEP 2896544 A2EP2896544 A2EP 2896544A2
Authority
EP
European Patent Office
Prior art keywords
vehicle
acceleration
engine
mass
inclination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14192963.8A
Other languages
English (en)
French (fr)
Other versions
EP2896544A3 (de
Inventor
Gernot Spiegelberg
Tilo MOSER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102014200557.4ApriorityCriticalpatent / DE102014200557B4 / de
Application filed by Siemens AGfiledCriticalSiemens AG
Publication of EP2896544A2publicationCriticalpatent / EP2896544A2 / de
Publication of EP2896544A3publicationCriticalpatent / EP2896544A3 / de
Withdrawnlegal-statusCriticalCurrent

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Images

Classifications

    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40 / 00 — Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40 / 12 — Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to parameters of the vehicle itself, e.g. tire models
    • B60W40 / 13 — Load or weight
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510 / 00 — Input parameters relating to a particular sub-units
    • B60W2510 / 08-Electric propulsion units
    • B60W2510 / 083 — Torque
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520 / 00 — Input parameters relating to overall vehicle dynamics
    • B60W2520 / 10 — Longitudinal speed
    • B60W2520 / 105 — Longitudinal acceleration
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520 / 00 — Input parameters relating to overall vehicle dynamics
    • B60W2520 / 16 — Pitch
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2530 / 00 — Input parameters relating to vehicle conditions or values, not covered by groups B60W2510 / 00 or B60W2520 / 00
    • B60W2530 / 20-Tire data
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2552 / 00 — Input parameters relating to infrastructure
    • B60W2552 / 15 — Road slope
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30 / 00 — Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30 / 18 — Propelling the vehicle
    • B60W30 / 18009 — Propelling the vehicle related to particular drive situations
    • B60W30 / 18054 — Propelling the vehicle related to particular drive situations at stand still, e.g. engine in idling state
    • B — PERFORMING OPERATIONS; TRANSPORTING
    • B60 — VEHICLES IN GENERAL
    • B60W — CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30 / 00 — Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30 / 18 — Propelling the vehicle
    • B60W30 / 18009 — Propelling the vehicle related to particular drive situations
    • B60W30 / 18109-Braking
    • B60W30 / 18118 — Hill holding

Abstract

Description

  • The invention relates to determining the vehicle mass or the vehicle weight in a vehicle, in particular in an electric vehicle or in an electric hybrid vehicle. These vehicles can be powered by accumulators or fuel cells, for example, and are widely used due to the lower pollutant emissions compared to internal combustion engines and the better climate and environmental compatibility when operated with alternative energies.
  • The invention relates to a method for determining the vehicle mass or the vehicle weight of an electric vehicle or an electric hybrid vehicle,
  1. a) whereby the motor torque of an electric motor is determined,
  2. b) an acceleration and / or an angle of inclination or an inclination of the vehicle or of the roadway on which the vehicle is traveling is determined, and
  3. c) where, using the engine torque, the acceleration and the angle of inclination or inclination,
or using the engine torque and acceleration,
or using the engine torque and the tilt angle or tilt
the vehicle mass or the vehicle weight is determined.
  • The invention also relates to a device, in particular for carrying out the above-mentioned method, the device comprising:
    • a unit for determining the torque of an electric motor,
    • a unit for determining the acceleration and / or the angle of inclination of a vehicle driven by the electric motor,
    • and a determination unit, the input side with an output of the unit for determining the torque and
    1. a) with the unit for determining the acceleration and the angle of inclination, or
    2. b) with the unit for determining the acceleration, or
    3. c) with the unit for determining the inclination angle or the percentage inclination
    is connected and which determines the vehicle mass or the vehicle weight of the vehicle.
  • The invention also relates to a vehicle with an electric motor, the vehicle containing the above-mentioned device.
  • The object of further developments is to specify a simple method for determining the vehicle mass or the vehicle weight of an electric vehicle or an electric hybrid vehicle. In addition, an associated device and an associated method are to be specified.
  • The object related to the method is achieved by the method steps specified in claim 1. Further developments are given in the subclaims. The tasks aimed at the device or the vehicle are achieved by the independent claims.
  • A further development is based on the consideration that it was comparatively difficult to determine the effective engine torque exactly in the case of the internal combustion engines used up to now, particularly at low speeds or low speeds. On the one hand, this is due to the fact that internal combustion engines do not allow low speeds, so that clutches are always required. In contrast, electric motors have a high torque even at low speeds or even when the electric motor is at a standstill, so that no clutch is required. In addition, in the case of electric motors, the torque of the motor is often already known in an inverter or in a control circuit or control circuit of the electric motor, see, for example, marketable inverters from Siemens AG, Bosch GmbH, Brusa Elektronik AG or other companies.
  • The torque of the electric motor is therefore available in a simple manner or can be determined in a simple manner from the current for driving the electric motor. This opens up the possibility, for example, of determining or calculating the vehicle weight in a simple manner from the engine torque.
  • In a method for determining the vehicle mass or the vehicle weight of an electric vehicle or an electric hybrid vehicle:
    1. a) the engine torque of an electric motor can be determined,
    2. b) an acceleration and / or an angle of inclination or an inclination of the vehicle or the lane on which the vehicle is traveling are determined,
    3. c) and using the engine torque, the acceleration and the angle of inclination / inclination,
    or using the engine torque and acceleration,
    or using engine torque and pitch angle / tilt
    the vehicle mass or the vehicle weight can be determined.
  • In addition to the method steps mentioned, further steps can be carried out or only the method steps mentioned for determining the vehicle mass or the vehicle weight are carried out.
  • The electric vehicle can be, for example, a car, a bus, a utility vehicle, a rail vehicle, a motorcycle, a scooter, a bicycle or another vehicle. In particular, the electric vehicle can also be a hybrid vehicle, i.e. it can be driven by an electric motor and a further drive.
  • The engine torque can be determined in various ways, e.g. specified, recorded, measured, in particular in SI units (International System).