阅读说明：本技术 用于估计内燃发动机的油中的燃料的稀释度的方法 (Method for estimating the dilution of a fuel in the oil of an internal combustion engine ) 是由 M·梭罗 B·佩拉德 于 2019-01-17 设计创作，主要内容包括：本发明涉及一种用于估计配备有需要燃料后喷射再生阶段的燃烧气体处理设备的内燃发动机的油中的燃料的稀释比的方法,在该方法之前进行的步骤期间,限定所述燃料的组成的多个部分(F<Sub>1</Sub>,F<Sub>2</Sub>,…F<Sub>x</Sub>),每个部分(F<Sub>i</Sub>)具有不同的密度,并且该方法包括：重复地在一系列时刻(t,t+dt)通过将在前一时刻估计的稀释比(T(t))与稀释比变化值(dT)相加来估计稀释比(T),该稀释比变化值是基于在两个连续时刻(t,t+dt)之间该油中的所述燃料的组成的该多个部分(F<Sub>1</Sub>,F<Sub>2</Sub>,…F<Sub>x</Sub>)中的每个部分(F<Sub>i</Sub>)的稀释比变化(dTi)的估计值而计算的。(The invention relates to a method for estimating the dilution ratio of a fuel in the oil of an internal combustion engine equipped with a combustion gas treatment device requiring a post-injection regeneration phase of the fuel, during which method a plurality of portions (F) of the composition of said fuel are defined during a step carried out before it 1 ，F 2 ，…F x ) Each of the portions (F) i ) Have different densities, and the method comprises: repeatedly estimating a dilution ratio (T) at a series of times (T, T + dT) by adding the dilution ratio (T (T)) estimated at the previous time to the dilution ratio variation value (dT),the dilution ratio variation value being based on the portions (F) of the composition of said fuel in the oil between two successive instants (t, t + dt) 1 ，F 2 ，…F x ) Each of (F) i ) Is calculated as an estimate of the change in dilution ratio (dTi).)

1. A method for estimating the dilution ratio of fuel in the oil of an internal combustion engine (1) equipped with a combustion gas treatment device (3) requiring a post-injection regeneration phase of fuel,

said method comprising the step of determining a total dilution speed (vdilt) of the fuel,

characterized in that, in a preliminary step of the method, a plurality of portions (F) of the composition of the fuel are defined₁，F₂，…F_x) Each of the portions (F)_i) Has the characteristics of different densities of the mixture,

and in that the method comprises: repeatedly estimating at a series of times (T, T + dT) a dilution ratio (T) by adding the dilution ratio (T (T)) estimated at the previous time to a dilution ratio variation value (dT) that is a function of the plurality of portions (F) of the composition of said fuel in the oil between two consecutive times (T, T + dT)₁，F₂，…F_x) Each of (F)_i) Is calculated as an estimate of the change in dilution ratio (dTi).

2. The estimation method according to claim 1, characterized in that each portion (Fi) of composition is related to the composition ratio (% Fi) of the fuel and to the vaporization speed (V) of said portion (Fi)_{Vaporization Fi}) Associated, dilution of each fraction (Fi)The estimated values of the degree (Ti) are the total dilution speed (VDlute) of the fuel, the composition ratio (% Fi) of the fuel and said vaporization speed (VDlute) of said portion_{Vaporization Fi}) As a function of (c).

3. Method for estimating according to claim 2, characterized in that said fraction (Fi) has a vaporization speed (V)_{Vaporization Fi}) Is a function of the engine torque (C) at the considered instant (t).

4. A method according to claim 2 or 3, characterized in that the estimated value of the dilution ratio variation (dTi) of each portion (Fi) between two consecutive instants (t, t + dt) is equal to the product of the total dilution rate (vdlute) and the composition ratio of the fuel (% Fi) minus the vaporization rate (vdi) of said portion (Fi)_{Vaporization Fi}) The result is multiplied by the time interval (dt) between the two successive instants.

5. Estimation method according to any one of claims 1 to 4, the engine being able to operate according to a regeneration mode, characterized in that outside said regeneration mode said total dilution speed (VDilt) of the fuel is equal to 0.

6. Estimation method according to any one of claims 1 to 5, the engine being able to operate according to a regeneration mode, characterized in that, in said regeneration mode, said total dilution speed (VDilt) of the fuel is predetermined according to the engine torque (C) and a value representative of the water temperature.

7. The estimation method according to any one of claims 1 to 6, characterised in that the dilution ratio variation (dT) at each moment (t, t + dT) is calculated as the plurality of portions (F) of the composition of said fuel in the oil₁，F₂，…F_x) Each of (F)_i) Is the sum of the estimated values of the change in dilution ratio (dTi).

8. An apparatus for estimating the dilution ratio of fuel in the oil of an internal combustion engine (1) equipped with a combustion gas treatment device (3) requiring a post-injection regeneration phase of fuel, by which the dilution ratio (T) is estimated according to the operating mode of the engine,

said device comprising means for determining the total dilution speed (vdilt) of the fuel,

characterized in that it comprises a plurality of portions (F) for defining the composition of said fuel₁，F₂，…F_x) Each part (F)_i) Have different densities;

and the apparatus comprises: means adapted to repeatedly estimate, at a series of times (T, T + dT), an estimate of the dilution ratio (T) by adding the dilution ratio (T)) estimated at the previous time to the dilution ratio variation value (dT);

the dilution ratio variation value (dT) being a function of the fractions (F) of the composition of said fuel in the oil between two successive instants (t, t + dT)₁，F₂，…F_x) Each of (F)_i) Is calculated as an estimate of the change in dilution ratio (dTi).

9. An engine assembly comprising an internal combustion engine equipped with a combustion gas treatment device (3) and an estimation device as claimed in claim 8.

10. A motor vehicle comprising the engine assembly of claim 9.