DE102018127492A1 - Method for the mode switching of a hybrid vehicle - Google Patents

Abstract

The invention relates to a method for operating mode switching of a hybrid vehicle (1), wherein the hybrid vehicle (1) comprises an internal combustion engine (2), an electric motor (3), a particle filter (4) for the internal combustion engine and a control unit (5) for switching the operating mode between an active internal combustion engine (2) and an active electric motor (3), comprising the steps:
a) determining a loading state of the particulate filter (4);
b) comparing the loading state with a desired state of the particulate filter (4);
c) switching and / or maintaining the operating mode of an active internal combustion engine (2) when the determined load state deviates from the desired state.

Description

The invention relates to a method for the mode switching of a hybrid vehicle, a computer program product, a control device and a hybrid vehicle.

The DE102013226621 B3 discloses a method and apparatus for operating a hybrid vehicle having two power units, wherein the two power units may each be operated alone or in common.

1. a) Ermitteln eines Beladungszustandes des Partikelfilters;
2. b) Vergleichen des Beladungszustandes mit einem Sollzustand für die Beladung;
3. c) Schalten und/oder Beibehaltung der Betriebsart eines aktiven Verbrennungsmotors, wenn der ermittelte Beladungszustand von dem Sollzustand abweicht.

The method according to the invention for operating mode switching of a hybrid vehicle, the hybrid vehicle comprising an internal combustion engine, an electric motor, a particle filter for the internal combustion engine and a control device for switching the operating mode between an active internal combustion engine and an active electric motor, comprising the steps:

1. a) determining a loading condition of the particulate filter;
2. b) comparing the loading state with a desired state for the loading;
3. c) switching and / or maintaining the operating mode of an active internal combustion engine when the determined load state deviates from the desired state.

The loading of the particulate filter corresponds to an amount of ash particles and / or soot particles which is located inside the particulate filter. In the following, ash particles and / or soot particles are referred to as ash. As a result, loads of the particulate filter with ash are referred to as ash charges.

In the course of the invention it has been shown that particle filters for ash charges below a few grams have a reduced filter efficiency. It was further shown that in an operating mode of an active electric motor, the ash charge in the particulate filter increases only slightly and / or not at all. On the other hand, the ash charge increases faster in an operating mode with an active combustion engine.

Mode switching to an active engine allows a fast increase in filter efficiency.

A computer program product according to the invention comprises a program which, when executed by a control unit, causes the control unit to carry out a method according to the invention.

An inventive control device for mode switching of a hybrid vehicle is set up to carry out a method according to the invention.

A hybrid vehicle according to the invention comprises a control unit according to the invention.

The advantages of the method according to the invention result in the same way for the computer program product according to the invention, the control unit according to the invention and the hybrid vehicle according to the invention.

Preferred embodiments will be explained in more detail with reference to the following figure.

1 schematically shows a hybrid vehicle according to the invention 1 , The hybrid vehicle includes an internal combustion engine 2 , an electric motor 3 , a control unit 5 and a particle filter 4 , The control unit 5 includes a computer program product 6 , The computer program product 6 includes a program that when it comes from a controller 5 running, the controller 5 causes to carry out a method according to the invention.

1. a) Ermitteln eines Beladungszustandes des Partikelfilters 4;
2. b) Vergleichen des Beladungszustandes mit einem Sollzustand für die Beladung;
3. c) Schalten und/oder Beibehaltung der Betriebsart eines aktiven Verbrennungsmotors 2, wenn der ermittelte Beladungszustand von dem Sollzustand abweicht.

The following is a method according to the invention for the mode switching of a hybrid vehicle 1 described. It includes the steps:

1. a) Determining a loading state of the particulate filter 4 ;
2. b) comparing the loading state with a desired state for the loading;
3. c) switching and / or maintaining the operating mode of an active internal combustion engine 2 when the determined loading state deviates from the desired state.

In step c), the electric motor 3 off.

The hybrid vehicle 1 is therefore only by means of the internal combustion engine 2 operated. All performance requirements are derived from the internal combustion engine 2 covered. The requested power for the internal combustion engine 2 is increased, resulting in more ash per time by the internal combustion engine 2 for the particle filter 4 is made available. This will increase the velocity of the ash charge of the particulate filter 4 elevated. This for a faster increase in filter efficiency.

The loading condition includes an ash load. The nominal state includes a limit for the ash load. The loading condition of the particulate filter 4 deviates from the nominal state if the ash charge is less than the limit value for the ash charge.

The limit for the ash load is 2 g.

Such a selected limit allows sufficient filter efficiency, for example, to comply with legal requirements for exhaust gas purity, for example in Germany.

The loading state includes a residence time of the ash in the particulate filter 4 , The nominal state includes a limit value for the residence time. The condition of the particulate filter 4 deviates from the nominal state of the particulate filter 4 if the dwell time is less than the dwell time limit.

The residence time is a time that a relevant subset of ash within the particulate filter 4 lingered. The relevant subset is a subset of the ash that is above the limit for the ash load, ie above 2 g. In addition, the relevant subset is a subset, the last in the particulate filter 4 through the internal combustion engine 2 was introduced. The limit for the residence time is 2 h.

Ash, which has a time of less than 2 hours within the particulate filter 4 The position within the particulate filter can often still linger 4 switch. Only ash, which over a longer period of time within the particle filter 4 dwells significantly contributes to the increase of the filter efficiency of the particulate filter 4 at. The reason for this is that ashes, which adhere to walls of the particulate filter 4 has decreased, to increase the filter efficiency is. Ash, which is mainly in the entrance area of the particulate filter 4 located and not evenly distributed on the walls of the particulate filter 4 is arranged, only reduced and / or not at all contributes to increasing the filter efficiency.

A dwell time of 2 hours is a time that the hybrid vehicle requires on average to travel about 100 km.

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 102013226621 B3 [0002]

Claims (9)

Method for operating mode switching of a hybrid vehicle (1), wherein the hybrid vehicle (1) comprises an internal combustion engine (2), an electric motor (3), a particle filter (4) for the internal combustion engine and a control device (5) for switching the operating mode between an active internal combustion engine ( 2) and an active electric motor (3) comprising the steps of: a) determining a loading state of the particulate filter (4); b) comparing the loading state with a desired state for the loading; c) switching and / or maintaining the operating mode of an active internal combustion engine (2) when the determined load state deviates from the desired state. Method for mode switching after Claim 1 , wherein in step c) the electric motor (3) is switched off. Method for mode switching according to one of the preceding claims, wherein the load state comprises an ash charge of the particulate filter (4), and wherein the target state comprises a threshold for the ash charge. Method for mode switching according to one of the preceding claims, wherein the loading state comprises a residence time of the ash in the particulate filter (4), and wherein the desired state comprises a limit for the residence time. Method for mode switching after Claim 3 wherein the load state deviates from the target state when the ash charge is less than the ash charge limit. Method for mode switching after Claim 4 wherein the load state deviates from the target state when the dwell time is less than the dwell time limit. A computer program product (6) comprising a program which, when executed by a controller (5), causes the controller (5) to perform a method according to any one of Claims 1 to 6 perform. Control unit (5) for mode switching a hybrid vehicle (1) set up a method according to one of Claims 1 to 6 perform. Hybrid vehicle (1) comprising a control unit (5) according to Claim 8 ,

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