Method for the performance of the gear disengagement in a servo-controlled manual gear change
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsFrancesco Cimmino, Fabrizio Amisano
Life of this patent
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Abstract
A method for the performance of the gear disengagement in a servo-controlled manual gear change, according to which an oscillation is generated with respect to the angular speed of a primary shaft of the gear change by abruptly opening the relative clutch and the disengagement of the gear is performed around the maximum amplitude of an oscillation half-wave, when this oscillation has caused the angular speed of the primary shaft to be relatively close to the angular speed that the primary shaft has to assume to carry out the engagement of the subsequent gear.
Claims36
A method for performing a gear disengagement in a servo-controlled manual gear change (5), which comprises a primary shaft (7) connected to an engine (2) and a secondary shaft (8) which transmits movement to drive wheels (3);
- the method including generating an oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) of the gear change (5) and performing disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft (7) has to assume to carry out the engagement of the subsequent gear (B).
A method for performing a gear change in a servo-controlled manual gear change (5), which method includes generating an oscillation with respect to the angular speed (ω1(t)) of a primary shaft (7) of the gear change (5) and performing the disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft has to assume in order to perform the engagement of the subsequent gear (B), the method then including the engagement of the subsequent gear (B) and the reclosure of the clutch (4) in order to cause the angular speed (ωm) of the drive shaft (10) to equal the angular speed (ω1) of the primary shaft (7) of the gear change (5), the clutch (4) being brought into a predetermined position (x*) in order to transmit a constant torque (Tcl*) and the clutch (4) being maintained in the predetermined position (x*) until the synchronisation of the drive shaft (10) and the primary shaft (7) has taken place.
A method for performing a gear disengagement in a servo-controlled manual gear change (5), the method including generating an oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) of the gear change (5) and performing disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft (7) has to assume to carry out the engagement of the subsequent gear (B);
- characterised in that the oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) is generated via an abrupt opening of the relative clutch (4);
- and characterised in that the clutch (4) is opened in a time smaller than the duration of the first quarter-wave of the actual oscillation frequency of the mechanical system of which the primary shaft (7) is part.
A method for performing a gear disengagement in a servo-controlled manual gear change (5), the method including generating an oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) of the gear change (5) and performing disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft (7) has to assume to carry out the engagement of the subsequent gear (B);
- and characterised in that the law of opening of the clutch (4) is adjusted as a function of a desired value of the amplitude of this oscillation.
A method for performing a gear disengagement in a servo-controlled manual gear change (5), the method including generating an oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) of the gear change (5) and performing disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft (7) has to assume to carry out the engagement of the subsequent gear (B);
- and characterised in that the law of opening of the clutch (4) is adjusted as a function of the deviation between the angular speed (ω1A) of the primary shaft (7) immediately prior to the gear change (5) and the angular speed (ω1B) of the primary shaft (7) immediately after the gear change (5).
A method for performing a gear disengagement in a servo-controlled manual gear change (5), the method including generating an oscillation with respect to the angular speed (ω1(t)) of the primary shaft (7) of the gear change (5) and performing disengagement of the gear (A) when this oscillation has caused the angular speed (ω1(t)) of the primary shaft (7) to be relatively close to the angular speed (ω1B) that the primary shaft (7) has to assume to carry out the engagement of the subsequent gear B);
- and characterised in that first actuator means (12) which control the disengagement of the gear (A) are actuated when the difference between the angular speed (ω1(t)) of the primary shaft (7) and the angular speed (ωm(t)) of the drive shaft (10) is higher as an absolute value than 50 rpm.
Dependencies are inferred from the claim text.