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Control method for a drive train with a transmission gear connected via freewheel

A transmission and drive train technology, applied in the drive train field of hybrid vehicles, can solve problems such as damage to driving comfort and component wear

Inactive Publication Date: 2019-10-15
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the freewheel is closed, violent impacts and severe jolts of the motor vehicle can impair driving comfort and / or lead to increased wear of components such as the freewheel

Method used

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  • Control method for a drive train with a transmission gear connected via freewheel
  • Control method for a drive train with a transmission gear connected via freewheel

Examples

Experimental program
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Effect test

Embodiment Construction

[0036] figure 1 Measurements are shown for a drive train with an engine, a transmission drivable by the engine via the engine shaft, and at least one transmission gear of a freewheel coupling that transmits tractive torque in operation without the method according to the invention.

[0037] figure 1 It is clarified that when the freewheel is opened during propulsion operation of the motor vehicle, the engine shaft speed U can also be the engine shaft speed U of the freewheel input speed. M,FE Significantly less than the free wheel output speed U FA , and if possible, decrease until the idle speed of the engine is above. When the driver manipulates the accelerator pedal or increases the position of the accelerator pedal in this state, the engine shaft-speed U M,FE With much torque and high power after a certain delay in fuel delivery (Gasnahme, sometimes called throttle response) and abrupt closing of the freewheel, this can lead to violent jerks and / or violent shocks in mot...

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Abstract

The invention relates to a control method for a drive train with a transmission gear connected via a freewheel. The invention relates to a method for controlling a drive train of a motor vehicle. Themotor vehicle is provided with a motor, a transmission driven by the motor via a motor shaft, and a transmission gear connected by a freewheel gear used for transmitting traction torque, wherein the speed of the motor shaft can be changed by the driver via change of the position of an accelerator pedal. In a simple and cost-effective manner, the ride comfort can be increased and / or the componentwear can be reduced if the at least one freewheeled transmission gear is active, engine-side freewheel input speed and freewheel output freewheel output speed of the freewheel are determined, the determined coasting output speed is greater than the determined coasting input speed and the position of the accelerator pedal is maintained unchanged or reduced, the engine is operated at a desired motor shaft speed, which is just below the determined freewheel output speed.

Description

technical field [0001] The invention relates to a method for controlling a drive train (Antriebsstrang, sometimes referred to as a powertrain) of a motor vehicle, in particular a hybrid vehicle, according to the features of the preamble of patent claim 1 . Background technique [0002] A drive train of a motor vehicle can have, in particular, at least one engine, for example an internal combustion engine and / or an electric motor, and a transmission that can be driven by the engine via an engine shaft. In this case, the rotational speed of the engine shaft can be changed by changing the position of the accelerator pedal by the driver. In the case of a conventional purely internal combustion engine driven motor vehicle, the drive train has the internal combustion engine. In the case of an electric vehicle, the drive train has an electric motor. In the case of a hybrid vehicle, the drive train has both the internal combustion engine and the electric motor and can be driven hy...

Claims

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Application Information

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IPC IPC(8): B60W30/18B60W20/00B60W10/06B60W10/10
CPCB60W30/18B60W20/00B60W10/06B60W10/10B60W2540/10B60W2510/1005B60W2710/0644B60K6/383B60K2006/4825B60W20/15B60W2030/1809B60W2510/0241B60W2510/0283B60W2710/028B60Y2400/427Y02T10/62Y02T10/60
Inventor S.舍费尔
Owner VOLKSWAGEN AG
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