Starting process for an internal-combustion engine

Details Starting process for an internal-combustion engine Starting process for an internal-combustion engine

1999-09-13

2001-09-11

Dolinar, Andrew M. (Department: 3747)

Internal-combustion engines

Starting device

Condition responsive control of starting device

Reexamination Certificate

active

06286470

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
This application claims the priority of German Application No. 198 41 752.7, filed Sep. 11, 1998, the disclosure of which is expressly incorporated by reference herein.
The invention relates to a process for starting an internal-combustion engine.
Conventional starting systems or starters are designed for commercially conventional cold-start limit temperatures. Under defined marginal parameters, such as the oil viscosity, the battery condition, the voltage drop, the compression quality, etc., a certain rotational starting speed occurs at a defined cold-start limit temperature. At other starting temperatures and other or undefined marginal parameters, the rotational starting speed is essentially accidental. This results in random starting events, for example, in the case of the required energy, the starting times, the starting safety and the exhaust gas crude emissions.
Possible measures using electronic control systems are conventionally used for increasing the operational safety and for reducing the starter noise.
It is an object of the present invention to provide a method for starting an internal-combustion engine with a view to an improved starting strategy. In the case of the present invention, the required electric starting energy is reduced, the starting time is shortened, the starting safety is increased and the crude emissions can be reduced.
This and other objects are achieved by a process for starting an internal-combustion engine, having a starting device in the case of which the rotational starting speed can be controlled or automatically controlled, characterized in that the rotational speed generated by the starting device can be adjusted to a defined maximal rotational starting speed.
Accordingly, in the case of a starting device for starting an internal-combustion engine, in which the rotational starting speed is controllable or automatically controllable, a defined maximal rotational starting speed is set. The maximum rotational starting speed (hereinafter abbreviated as: maximum rotational speed) is preferably selected as a function of vehicle operating and/or internal-combustion engine parameters. As a result of the defined rotational starting speed, a synchronization of the control units, of the transmission line and of the first firing of the internal-combustion engine can take place. This saves electric starting energy. Furthermore, the parameters for the ignition and the mixture preparation can be adjusted in a targeted manner to the defined rotational speed. This results in a much more precise adjustment than in the case of conventional starting devices, wherein the adjustment cannot be coordinated with the rotational starting speed in the required manner. By means of the measure according to the present invention, crude emissions during the starting phase can therefore clearly be reduced.
In order to achieve a good balancing of energy, the acceleration up to the defined rotational starting speed takes place with a torque which is optimal for the starting motor and the internal-combustion engine. This again saves electric starting energy. Furthermore, the starting device can promote the running-up of the engine during a start to a provided rotational starting end speed, so that a secure starting—also in the case of a cold start—will always be ensured.
In a particularly advantageous embodiment of the present invention, the crankshaft is adjusted to an angular value which is positive for the start. By means of this adjustment (for example, the approaching of a synchronization mark), the synchronization time during the subsequent start can be reduced approximately by up to one revolution. This also contributes to the improvement of the energy balance of the starting battery. The rotation of the crankshaft into this positive starting position can take place before an imminent start, but in a still more advantageous manner, during or after the switching-off of the internal-combustion engine. In the latter case, the energy expenditure for the rotation or the stopping of the crankshaft is the lowest because the engine is still warm.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.


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