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A technology for recovering torque and generators, which can be used in control devices, vehicle components, hybrid vehicles, etc., and can solve problems such as loss of energy share

Inactive Publication Date: 2015-12-02
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although electric motors have relatively high efficiency, they lose a significant energy share not only when converting kinetic energy to electrical energy but also when converting electrical energy (inversely) to kinetic energy of the vehicle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] If the vehicle is driving, for example, at a speed of 80 km / h to a road section on which there is a speed limit of, for example, 60 km / h, then this can be relaxed at, for example, 100 or 200 m before the speed limit (gehen) throttle advice to inform the driver.

[0029] If the driver follows this advice and releases the accelerator pedal, the electric motor in the vehicle is controlled or regulated in such a way that the generator torque (braking torque) generated by the electric motor will drive the vehicle (if possible) on the road section up to the speed limit Generator braking to the maximum permitted speed before the section. According to the invention, the generator torque is thus generated in a demand-dependent manner, thereby improving the efficiency of the vehicle.

[0030] The later the driver takes the advice to release the accelerator, the greater the dynamo-like braking power that is controlled or regulated. For example, it can be stipulated that when the...

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PUM

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Abstract

The invention relates to a method for controlling the recuperation torque, which is produced by an electric machine of a vehicle operating in generator mode in the overrun operation mode of the vehicle, in an open-loop or closed-loop manner in accordance with need, comprising the following steps: - detecting, on the basis of a specified algorithm, an imminent situation in which the speed of a vehicle should be reduced to a speed lower than the current speed, - outputting a recommendation directed at the driver to release the accelerator when the expected occurrence of such a situation has been detected, and, - if the driver has released the accelerator, - controlling the recuperation torque in an open-loop or closed-loop manner in such a way that the vehicle achieves the lower speed without actuation of the service brake when the situation occurs, or, if this cannot be achieved solely via the recuperation torque, - maximising the vehicle deceleration that can be produced by means of recuperation.

Description

technical field [0001] The invention relates to a method according to the features of claim 1 . Background technique [0002] In electric or hybrid vehicles as well as in conventional vehicles, the kinetic energy of the vehicle is recovered, i.e. converted, during overrunning by one or more electric machines present in the vehicle (electric drive motors or "generators") It is electrical energy and is intermediately stored in the vehicle's battery. [0003] Although electric machines have a relatively high efficiency, a significant energy share is lost not only in the conversion of kinetic energy into electrical energy but also in the (reverse) conversion of electrical energy into kinetic energy of the vehicle. As a rule of thumb, only about 80% of the kinetic energy of a vehicle can be converted into electrical energy, and likewise only about 80% of the electrical energy can be converted back into kinetic energy of the vehicle. Contents of the invention [0004] The obje...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/00B60W30/18B60W50/14
CPCB60W30/18127B60L7/18B60W10/08B60W10/184B60W20/1062B60W30/143B60W30/16B60W50/14B60W2420/42B60W2520/10B60W2540/10B60W2550/142B60W2550/143B60W2550/146B60W2550/22B60W2550/302B60W2550/308B60W2550/402B60W2710/083B60W2720/10B60W2720/106B60Y2300/89B60L2240/12B60L2240/622B60L2240/642B60L2250/26B60W20/14B60W2552/15B60W2552/20B60W2552/30B60W2554/801B60W2554/804B60W2555/60B60W2556/50Y02T10/72Y02T90/16
Inventor J·格伦德赫尔O·舍里格
Owner BAYERISCHE MOTOREN WERKE AG
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