FR3072416B1 - HYBRID VEHICLE POWER UNIT WITH DOWNSTREAM PROBE IN OPTIMIZED POSITION - Google Patents

Abstract

The invention relates to a hybrid vehicle powertrain equipped with a catalyst (110) and an electrified gearbox. The catalyst (110) has a central body (110c) extending along an axis (XX ') between an upstream portion and a downstream end portion (110a). Upstream and downstream probe connection jacks arranged on said upstream and downstream portions (110a). The catalyst (110) comprises at least two downstream probe connection jacks (P01, P02).

Description

HYBRID VEHICLE POWER UNIT WITH DOWNSTREAM PROBE IN OPTIMIZED POSITION

The invention relates to a hybrid vehicle powertrain equipped with a catalyst and an electrified gearbox, the catalyst having a downstream probe in an optimized position relative to the electrified gearbox.

A catalyst for a hybrid vehicle is used for the depollution of the exhaust gas. This catalyst needs a temperature of about 250 ° C to 300 ° C to operate. The pollution is carried out continuously for as long as the vehicle is running and two probes, generally oxygen probes, are installed upstream and downstream of this catalyst: a control sensor located upstream of the catalyst measures the oxygen in the vehicle. the exhaust gas, and a diagnostic probe located downstream of the catalyst measures the oxygen contained in the exhaust gas treated with this catalyst.

The electrified gearbox is generally equipped with an electric machine, an inverter, and a water / oil exchanger for maintaining the inside of the electrified gearbox at a temperature below 120 ° C. . Two types of electrified gearbox architecture are currently installed in motor vehicles, respectively illustrated by the schematic figures 1 and 2: an architecture for rechargeable hybrid vehicle, called PHEV / 320V ("PHEV" being the anagram). "Plug-In Electric Vehicle" in English terminology, at a voltage of 320 V), and a semi-hybrid vehicle architecture, called MHEV / 48V ("MHEV" being the anagram of "Mild Hybrid Electric Vehicle"). > in English terminology, at a voltage of 48 V).

Figures 1 and 2 are schematically shown powertrain 2 and 2 'respectively in a hybrid vehicle 10 rechargeable and semi-hybrid 10', these powertrains comprising a hybrid motor 3, respectively 3 ', a box electrified speed 4, respectively 4 ', and a catalyst 11, an end portion 11a is a support mounting the downstream probe (referenced 12 in Figure 3). The electrified gearbox 4, respectively 4 ', comprises a starter / generator said electrical machine 5 (respectively 5'), an inverter 6 (respectively 6 '), and a water / oil exchanger 7.

[0005] The inverter 6 of the electrified gearbox 4 of the rechargeable hybrid vehicles (see FIG. 1) is located in the upper position of the electrified gearbox 4, while the inverter 6 'of the electrified gearbox 4 Semi-hybrid vehicles (see Figure 2) is arranged in the extension of the electric machine 5 '.

Whatever the type of electrified gearbox 4 or 4 ', the catalyst 11 is located on the front side of the AV motor vehicle, and the diagnostic probe is mounted on the end portion 11 of the Catalyst 11 vis-à-vis the water / oil exchanger 7, arranged in the lateral position of gearbox 4 or 4 '.

Figure 3 shows precisely the mounting of the diagnostic probe 12 on the end portion 11a of the catalyst 11 for one or the other type of electrified gearbox. This assembly is performed near the electrified gearbox 4 or 4 ', in the immediate vicinity of the water / oil exchanger 7. A mounting handle 20 has a window 21 which reveals the downstream probe 12. Thus, too much close proximity of the downstream probe 12 and the mounting handle 20 with here the water / oil exchanger 7, and more generally the gearbox 4 or 4 \ highlights a problem of size between these parts.

STATE OF THE ART

Under these conditions, the proximity within a motor of the electrified gearbox and catalyst raises the question of a relative reorganization of these parts, because the position of the downstream diagnostic probe is placed too close to the water / oil exchanger to allow its assembly in standard conditions or to access it in case of change of probe.

But this probe can not be moved to the front of the motor vehicle due to technical constraints of space. One solution would be a change in the position of the parts of the electrified gearbox, which involves redefining the design of these gearboxes. Another solution would be to define a second type of catalyst, with a position of the adapted downstream diagnostic probe, which then implies having two types of catalyst and two types of tools for both types of electrified gearbox. . This solution therefore multiplies the means of implementation.

The invention therefore has the main objective of simplifying the assembly operations of a motor vehicle. For this, the invention provides a single catalyst model for a hybrid vehicle with an electrified gearbox, this catalyst being adjustable depending on the type of electrified gearbox used.

More specifically, the present invention relates to a hybrid vehicle powertrain equipped with a catalyst and an electrified gearbox. The catalyst comprises a central body extending along an axis between an upstream portion and a downstream end portion, and upstream and downstream probe connection jacks arranged on said upstream and downstream portions. In this powertrain, the catalyst comprises at least two downstream probe connection jacks in order to be able to couple, for any type of electrified gearbox, the downstream probe to the connection junction without the elements of the gearbox being able to interfere. mounting this downstream probe.

According to advantageous features: - the end portion of the catalyst having a tubular shape, the downstream probe annexing plugs are arranged annularly on this part of the end, according to different angular positions; the advantage is to allow an easy adaptation of the positioning of the downstream probe through this arrangement of these irises arranged side by side, while safeguarding a close cohabitation of the analyzer with different types of electrified gearboxes; the downstream probe connection jacks have an orifice lined with a thread; alternatively, the downstream probe connection sockets are clipping orifices; - a shutter closes the unused connection sockets; - The element of the electrified gearbox disposed opposite the downstream probe is in water / oil heat exchanger; the downstream probe connection sockets are two in number; the downstream probe connection sockets have identical dimensions in order to be able to use probes and shutters equipped with lenticular size connectors; at least two downstream probes are arranged on two connection sockets; this has the advantage of making as many measurements downstream of the catalyst as probes.

The invention also relates to a hybrid motor vehicle equipped with a powertrain as defined above.

In the present text, the qualifiers "on", "under", "superior" refer to the locations of elements with reference to equipment positioned in standard use. The qualifiers "upstream" and "downstream" refer to the flow direction of the exhaust gases. In the figures, identical elements are identified by the same reference sign which refers to the (x) passage (s) of the description which mentions it (nt).

Other data, characteristics and advantages of the present invention will appear on reading the following nonlimited description, with reference to the appended figures which represent, respectively: FIGS. 1 and 2, schematic views of powertrains respectively of rechargeable hybrid vehicle and semi-hybrid vehicle, each group being equipped with an electrified gearbox and a catalyst (already commented); - Figure 3, a view of the mounting in perspective of a downstream probe on the end portion of a catalyst according to the state of the art (already commented); FIG. 4 is a perspective view of an exemplary powertrain catalyst according to the invention provided with two downstream probe connection sockets; FIG. 5, a perspective view showing, in a rechargeable hybrid vehicle, the mounting of a downstream probe on a catalyst end portion according to the invention; and FIG. 6, a perspective view showing, in a semi-hybrid vehicle, the mounting of a downstream probe on a catalyst end portion according to the invention.

[0016] With reference to the perspective view of FIG. 4, the example of catalyst 110 according to the invention shown is part of a powertrain of a hybrid vehicle with electrified gearbox 4 or 4 '(see FIGS. 5 and 6). The catalyst 110 has a cylindrical central body 110c of axis XX 'which is extended by a downstream end portion 110a of curved tubular shape of smaller diameter than the central portion 110c.

Two connection jacks P01 and P02 for mounting a downstream probe are formed side by side annularly on the downstream end portion 110a to define two mounting axes, respectively Y1 and Y2, of distinct angular orientation. The choice of the connection socket P01 or P02 used for this probe depends on the configuration of the gearbox, and more particularly on the position of the element of this gearbox which will be located closest to the probe once. climb. Advantageously, the connection jacks P01 and P02 have identical dimensions in order to be able to use probes and plug shutters with connectors of identical size.

These connection jacks P01 and P02 have an orifice lined with a thread to ensure the connection by screwing. Alternatively, the P01 and P02 jacks may have connection ports formed for clipping coupling. In this embodiment, the connection jacks P01 and P02 are two in number, but it is possible to install several, particularly annularly around the tubular end portion 110a.

The perspective view of Figure 5 shows, in a plug-in hybrid vehicle, the mounting of the downstream probe 12 on the catalyst 110, disposed next to the electrified gearbox 4. The connection socket P01 being placed at near the water / oil exchanger 7, the mounting of the downstream probe 12 on this P01 socket would cause too much proximity, or even contact, between the downstream probe 12 (and the mounting handle 20, see Figure 3) and the exchanger 7. The connection socket P01 is not used and a shutter 50 blocks its opening. The downstream probe 12 is then coupled to the connection socket P02, so that the axis of the probe 12 coincides with the axis Y2 of the P02 tap. The downstream probe 12 is thus well separated from the immediate environment of the water / oil exchanger 7.

The perspective view of Figure 6 shows, in a semi-hybrid vehicle, the mounting of the probe 12 on the catalyst 110, next to the electrified gearbox 4 ". On this 4 "gearbox, the water / oil exchanger 7 is positioned on the top of the electrified gearbox 4". This location is available because the inverter 6 'is placed on the front AV of the electrified gearbox 4 ", in the extension of the electric machine 5' (see also Figure 2, in which the exchanger 7 remained in the lateral position of the gearbox 4 ').

The probe 12 can then be mounted on the P01 socket along the Y1 axis (as shown in Figure 6) or the P02 socket, without its assembly is hindered by the gearbox 4 ". Shutter 50 closes the opening of the unused socket (P02 in the example shown). In the illustrated case, it is possible to mount a second downstream probe on the P02 socket, and thus to benefit from a second source of information, without the 4 "speed box hindering its mounting.

The invention is not limited to the embodiments described and shown. For example, downstream probe connection sockets may be associated with a slide-mounted shutter to plug the unused connection socket.

Claims (10)

A power train (2, 2 ') of a hybrid vehicle equipped with a catalyst (110) and an electrified gearbox (4, 4', 4 "), the catalyst (110) having a central body (110c ) extending along an axis (XX ') between an upstream portion and a downstream end portion (110a), and upstream and downstream probe connection jacks arranged on said upstream and downstream portions (110a), the power unit (2,2 ') being characterized in that the catalyst (110) comprises at least two downstream probe (12) connection jacks (P01, P02). 2. Power train (2, 2 ') according to claim 1, wherein the end portion (110a) of the catalyst (110) having a tubular shape, the connection jacks (P01, P02) downstream probe (12). are arranged annularly on this end portion (110a) in different angular positions. 3. Powertrain (2, 2 ') according to any one of claims 1 or 2, wherein the downstream probe connection jacks (P01, P02) (12) have an orifice lined with a thread. 4. Powertrain (2, 2 ') according to any one of claims 1 or 2, wherein the downstream probe connection jacks (P01, P02) (12) are clipping coupling orifices. 5. powertrain (2, 2 ') according to any one of the preceding claims, wherein a shutter (50) closes the connection terminals (P01, P02) not used. 6. Powertrain (2, 2 ') according to any one of the preceding claims, wherein the element of the electrified gearbox (4, 4') disposed opposite the downstream probe (12) is a water exchanger / oil (7). 7. Powertrain (2, 2 ') according to any one of the preceding claims, wherein the connection terminals (P01, P02) downstream probe (12) are two in number. 8. Powertrain (2, 2 ') according to any one of the preceding claims, wherein the downstream probe connection jacks (P01, P02) have identical dimensions. 9. Powertrain (2, 2 ') according to any one of the preceding claims, wherein at least two downstream probes (12) are arranged on two jacks (P01, P02). 10. Motor vehicle, characterized in that it comprises a powertrain (2, 2 ') according to any one of the preceding claims.