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Method for operating an internal combustion engine of a motor vehicle with an automatic transmission

A technology of automatic transmission and internal combustion engine, applied in the direction of internal combustion piston engine, automatic control, automatic control, etc., can solve the problem of exhaust gas enthalpy reduction, and achieve the effect of reducing the risk of damage, reducing overshoot, and smoothing torque release.

Pending Publication Date: 2020-02-21
梅赛德斯-奔驰集团股份公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the smaller amount of fuel injected reduces the exhaust gas enthalpy

Method used

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  • Method for operating an internal combustion engine of a motor vehicle with an automatic transmission
  • Method for operating an internal combustion engine of a motor vehicle with an automatic transmission
  • Method for operating an internal combustion engine of a motor vehicle with an automatic transmission

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Embodiment Construction

[0031] in accordance with figure 1 It will be described how, in a motor vehicle with an automatic transmission, an undesired significant drop in charge pressure can be avoided by increasing the exhaust gas enthalpy during an upshift by means of a delayed supplementary injection. This means that the torque delivered by the internal combustion engine is temporarily reduced when, for example, a high load, in particular a full load, of the internal combustion engine of a motor vehicle with automatic transmission shifts into a higher gear.

[0032] The internal combustion engines exemplified above are especially diesel engines. Accordingly, the transmission control unit of the automatic transmission requests the engine controller of the diesel engine to reduce the engine torque, ie the torque delivered by the diesel engine, for example during a full-load upshift. In the case of diesel engines, this is achieved by reducing the injection quantity. That is, the amount of injected fu...

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Abstract

The invention relates to a method for operating an internal combustion engine of a motor vehicle with an automatic transmission, wherein a torque provided by the internal combustion engine is reduceddepending on the operating state of a powertrain of the motor vehicle. Depending on an excess of combustion air which occurs upon reducing the torque, said combustion air being supplied to the internal combustion engine by means of a turbocharger, the fuel combustion efficiency relating to the torque provided by the internal combustion engine is reduced in at least one combustion chamber of the internal combustion engine.

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine of a motor vehicle with an automatic transmission. In this case, the torque delivered by the internal combustion engine is reduced depending on the operating state of the drive train of the vehicle. Background technique [0002] For example, in a motor vehicle with an automatic transmission, the torque delivered by the internal combustion engine is limited during full-load upshifts. In particular, the transmission control requires, for example, the engine controller to limit or reduce the torque. During full-load acceleration, this requirement leads to a reduction in engine torque, ie a reduction in the torque delivered by the internal combustion engine. After the gearshift process is complete, the torque limitation is canceled again. [0003] For example, in internal combustion engines designed as diesel engines, the injection quantity, ie the quantity of fuel injected in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/02F02D41/40F02D41/00B60W30/19F02P5/15
CPCF02D41/023F02D41/401F02D41/405F02P5/1504F02D41/0007F02D2250/21F02D2250/22Y02T10/12Y02T10/40F02D41/0225F02D41/1454
Inventor M·沙伯S·鲍姆加特纳G·施耐德N·鲁霍拉明
Owner 梅赛德斯-奔驰集团股份公司
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