Commission Regulation (EU) 2017/2400Show full title

Generic model – torque converter U.K.

Generic torque converter model based on standard technology:

For the determination of the torque converter characteristics a generic torque converter model depending on specific engine characteristics may be applied.

The generic TC model is based on the following characteristic engine data:

n_rated

=

Maximum engine speed at maximum power (determined from the engine full-load curve as calculated by the engine pre-processing tool) [rpm]

T_max

=

Maximum engine torque (determined from the engine full-load curve as calculated by the engine pre-processing tool) [Nm]

Thereby the generic TC characteristics are valid only for a combination of the TC with an engine sharing the same specific characteristic engine data.

Description of the four-point model for the torque capacity of the TC:

Generic torque capacity and generic torque ratio:

Figure 1

Generic torque capacity

Figure 2

Generic torque ratio

where:

T_P1000

=

Pump reference torque; [Nm]

v

=

Speed ratio; [-]

μ

=

Torque ratio; [-]

v_s

=

Speed ratio at overrun point; [-]

For TC with rotating housing (Trilock-Type) v_s typically is 1. For other TC concepts, especially power split concepts, v_s may have values different from 1.

v_c

=

Speed ratio at coupling point; [-]

v₀

=

Stall point; v ₀ = 0 [rpm]

v_m

=

Intermediate speed ratio; [-]

The model requires the following definitions for the calculation of the generic torque capacity:

• Stall point:

  • Stall point at 70 % nominal engine speed.

  • Engine torque in stall point at 80 % maximum engine torque.

  • Engine/Pump reference torque in stall point:

    

• Intermediate point:

  • Intermediate speed ratio v_m = 0,6 * v_s

  • Engine/pump reference torque in intermediate point at 80 % of reference torque in stall point:

    

• Coupling point:

  • Coupling point at 90 % overrun conditions: v_c = 0,90 * v_s

  • Engine/pump reference torque in clutch point at 50 % of reference torque in stall point:

    

• Overrun point:

  • Reference torque at overrun conditions = v_s :

    

The model requires the following definitions for the calculation of the generic torque ratio:

• Stall point:

  • Torque ratio at stall point v₀ = v_s = 0:

    

• Intermediate point:

  • Linear interpolation between stall point and coupling point

• Coupling point:

  • Torque ratio at coupling point v_c = 0,9 * v_s :

    

• Overrun point:

  • Torque ratio at overrun conditions = v_s :

    

• Efficiency:

  n = μ * v

Linear interpolation between the calculated specific points shall be used.