Method and device for starting an internal combustion engine

A technology for internal combustion engines and starting torque, applied in the direction of internal combustion piston engines, motor starters for engines, combustion engines, etc., can solve problems such as limitations and cost that cannot be realized meaningfully

Active Publication Date: 2012-05-23
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the omission of the starter motor or the second electric machine, the achievable advantages are limited here if the capacity of the electric energy store is not simultaneously enlarged (thus resulting in a so-called strong hybrid drive)
[0012] The mentioned alternatives "mild hybrid with conventional starter", "mild hybrid with oversized (überdimensioniert) electric motor" and "strong hybrid" are due to technical and / or Economical reasons (cost, weight and / or installation space) cannot be implemented meaningfully in many hybrid vehicles

Method used

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  • Method and device for starting an internal combustion engine
  • Method and device for starting an internal combustion engine
  • Method and device for starting an internal combustion engine

Examples

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Embodiment Construction

[0103] Before explaining the embodiments in detail, the prior art is shown first.

[0104] figure 1 Shows the curve of the sliding friction torque 1 over one working cycle of a four-cylinder four-stroke engine. Here, the duty cycle includes, for example, also image 3 The angular range of 0° to 720° is shown in crankshaft angle 2. In this case, the sliding friction torque 1 is essentially composed of two components. If the starting friction torque is overcome, then at Figure 7 Sliding friction occurs at the friction points of the internal combustion engine 3 shown in , in particular at the cylinder running surfaces and bearings. In principle, this brings about a braking of the rotational movement of the crankshaft. The frictional force acting between the piston and the working surface of the cylinder is converted into a frictional torque by the crankshaft drive, which fluctuates during the working cycle. Thus, the sliding friction moment 1 is obtained at figure 1 The a...

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PUM

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Abstract

The invention relates to a method and a device for starting an internal combustion engine (3) of a motor vehicle, said internal combustion engine (3) exerting a drive torque on a crankshaft in a preferred direction of the internal combustion engine (3), a starting motor (9) exerting a starting torque (7) on the crankshaft during a starting process to achieve a minimum rotational speed of the internal combustion engine (3), a control unit regulating the starting torque (7). Said control unit regulates the starting torque (7) in a time-dependent manner between a positive maximum starting torque (27) and a negative minimum starting torque (27) during the starting process, a positive starting torque acting on the crankshaft in the direction of the preferred direction and a negative starting torque in the direction opposite thereto.

Description

technical field [0001] The invention relates to a method and a device for starting an internal combustion engine. Background technique [0002] An internal combustion engine is generally not able to start independently, but requires a minimum rotational speed of, for example, 60 to 200 rpm for starting. For this purpose, a battery-powered starter motor is usually used, which can also deliver a breakaway moment when the vehicle is stationary. The basic moments that must be overcome by the breakaway torque during the starting process are breakaway friction moment, friction moment and compression moment. At the beginning of the starting process, the crankshaft of the internal combustion engine is stationary. Static friction occurs via existing friction points such as cylinder running surfaces and / or crankshaft bearings. In order for the crankshaft to rotate completely, this static friction must first be overcome in the first phase. For this, a corresponding torque must be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02N11/08
CPCF02N2019/008F02N2300/102F02N19/005F02N2300/104F02N11/0814F02N2019/007Y02T10/48Y02T10/40
Inventor H·福格特U·欣里希森A·施文格
Owner VOLKSWAGEN AG
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