DE102013207619A1 - Starter system for an internal combustion engine and method for starting an internal combustion engine - Google Patents

Abstract

The invention relates to a starter for an internal combustion engine of a motor vehicle, which combines the function of a flywheel mass storage device with the principle of an electric motor.

Description

Field of the invention

The present invention relates to a starter for an internal combustion engine of a motor vehicle.

Background of the invention

The field of application of the invention relates both to vehicles with a conventional internal combustion engine powertrain, but also to vehicles with hybrid drive. Common to these two vehicle categories is that a starter is used for starting the engine. This applies regardless of the transmission type or the further architecture of the hybrid concept.

The advantage of such a conventional starter is its robust and reliable technology. The big disadvantage of such a starter, however, is in the meshing of the starter pinion in the engine flywheel, because the flywheel must be stationary for this purpose. This means that the entire internal combustion engine must first be at a standstill for a starting process.

Concepts are already known from the prior art, with which a still expiring internal combustion engine can be started, so a so-called "change-of-mind-start" can be performed. For example, a belt-starter-generator and a permanent-mounted starter on the transmission side or on the front-end accessory drive (FEAD) side are known. However, the integration of such systems does not come without noticeable application effort or expense in the geometric implementation.

The DE 10 2007 032 316A1 describes a vehicle having an energy-chopping and storage device, wherein the energy store is a helical spring. The energy store can be switched on or off by the internal combustion engine. When the internal combustion engine runs out, its kinetic energy is stored. When starting, this energy of the coil spring is provided to the starting process, so that it can be started faster. Since the coil spring of the internal combustion engine (pre) has to be stretched, it can not be used for a cold start. When the internal combustion engine runs out, the sprocket of the starter must first be synchronized with the flywheel before the coil spring can then be coupled to the flywheel.

A space problem already arises from the fact that the energy storage and the starter are on different sides of the flywheel, whereby additional axial space is needed. Another disadvantage is that the starter must be coupled with the flywheel to store the energy.

Object of the invention

The object of the invention is therefore to provide a starting system with which a still expiring internal combustion engine can be started so that a possibly necessary single-track waiting time is eliminated and thus the starting process is accelerated. Ideally, this should cover the start-stop application with a correspondingly high number of restart operations and also the cold start operations. It should be possible to harness or use the kinetic energy of the expiring engine. At the same time, the system should be suitable for vehicles that previously had a conventional starter, without the need for complex structural changes.

Summary of the invention

This object is achieved by a motor starter according to claim 1 and by a method for starting an internal combustion engine according to claim 5. Further embodiments can be found in the respective subclaims.

The inventive arrangement combines the operation of an electric motor with permanent magnets, a rotating mass and a magnetic coupling, wherein the rotational mass serves as an energy storage. The rotational mass has a Rotationsmasseritzel which is permanently eingespurt in the flywheel of the engine.

Description of the drawings

Embodiments of the invention are illustrated in the figures, which are described in detail below, wherein the invention is not limited to these embodiments.

The overall view of the engine starter in 1 schematically shows the internal combustion engine 1 , the starter pinion 2 and the rotary pestle 3 , The rotary pestle 3 is via a magnetic coupling 4 with the rotational mass 5 connected. It can also be seen the radial bearing 7 the rotational mass 5 and the internally arranged permanent magnets 8a . 8b , In the rotation center of the rotational mass 5 a stator is arranged, which can produce a magnetic field comparable to a stator of an electric motor via a winding and is rotatably mounted.

A task of magnetic coupling 4 is it, the rotational mass 5 (Flywheel) to the flywheel of the internal combustion engine 1 to pair as soon as it is identified. In this way, stores the rotational mass 5 kinetic energy of the expiring internal combustion engine 1 for a later restart (flywheel storage). Another task of the magnetic coupling 5 it is, at a suitable time, the rotational mass 5 to decouple again from the flywheel. The outgoing flywheel should be the rotational mass stored radially to the electric motor 5 do not slow down.

If a restart of the internal combustion engine 1 is desired, couples the magnetic coupling 5 the rotational mass 5 to the flywheel, leaving the internal combustion engine 1 is accelerated.

If the rotational mass 5 still has enough kinetic energy, or has a sufficient speed, alone by the internal combustion engine 1 be started without the need for an energy supply. In this case, the re-start can only be done by rotating in the mass 5 stored energy done.

In the event that the rotational mass 5 does not store enough kinetic energy to the internal combustion engine 1 To start, there is an energy supply to the rotational mass via the stator 6 to the kinetic energy of the rotational mass 5 to increase.

A synchronization of the flywheel to the starter system is not necessary because the rotational mass is permanently meshed in the flywheel.

Because the arrangement according to the invention combines the mode of operation of a flywheel mass accumulator with the functional principle of a starter electric motor, not only is no additional installation space required compared with conventional pinion starters, but even space is saved.

LIST OF REFERENCE NUMBERS

1

Internal combustion engine

2

starter pinion

3

Rotating mass gear

4

magnetic coupling

5

rotating mass

6

electric motor

7

radial bearing

8a, 8b

permanent magnets

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007032316 A1 [0005]

Claims (5)

Starter system for an internal combustion engine with an energy storage device for storing and returning kinetic energy into a starting process comprising a starter pinion (US Pat. 2 ) and a rotary pest ( 3 ), which via a magnetic coupling ( 4 ) with a rotational mass ( 5 ) is connectable. Starter system according to claim 1 with within the rotational mass ( 5 ) permanent magnets ( 8a . 8b ) and one in the center of rotation of the rotational mass ( 5 ) rotatably mounted stator ( 6 ) with a winding for generating a magnetic field. Starter system according to claim 1 or 2, wherein the rotary mass ( 3 ) is permanently inserted in a flywheel of the internal combustion engine. Method for starting an internal combustion engine, comprising connecting a rotary earth pinion ( 2 ) with a rotational mass ( 5 ) via a magnetic coupling ( 4 ), Supplying kinetic energy of one with the rotary mass ( 2 ) permanently meshed flywheel to the rotational mass ( 5 ), Separating the rotary earth pinion ( 2 ) of the rotational mass ( 5 ) by the magnetic coupling, connecting the Rotationsmaßitzels ( 2 ) with the rotational mass ( 5 ) via the magnetic coupling ( 4 ) and returning kinetic energy from the rotating mass ( 5 ) to the rotating mass ( 2 ). Method for starting an internal combustion engine according to claim 4, further comprising supplying kinetic energy from a center of rotation of the rotational mass ( 5 ) rotatably mounted stator ( 6 ) with a winding for generating a magnetic field to the rotating mass.

Images