Method and device for synchronising an idler pinion of a gearbox with the shaft thereof
The invention relates to a method for synchronising the common speed (ω p) of two concentric primary shafts ( 1, 6 ) of a hybrid transmission in a hybrid operating mode wherein said two shafts are rotatably connected by a first coupling means ( 5 ), with the speed (ω s) of a secondary transmission shaft ( 10 ) comprising at least one idler pinion for allowing the coupling of one of said pinions ( 11, 12 ) to the shaft ( 10 ) thereof by closing a second coupling means ( 13 ) that does not have mechanical synchronisation bodies, the torque (Te) of the electric machine being temporarily reduced during the synchronisation phase in order to meet the conditions of a perfect coupling when the value thereof caps at an upper limit value (T e max ) or a lower limit value (T e min ).
1. A synchronizing method of synchronizing a speed ( ω p) common to two concentric primary shafts of a hybrid transmission cumulatively receiving torque (T ice ) from a combustion engine and torque (Te) from an electric machine in a hybrid mode of operation in which the two concentric primary shafts are rotationally connected by a first coupling, with the speed ( ω s) of a secondary transmission shaft bearing at least one idler pinion, to allow one of the at least one pinion to be coupled to the secondary transmission shaft by closure of a second coupling with no mechanical synchronizing members, the method comprising:
temporarily reducing, via processing circuitry, the torque (Te) of the electric machine during the synchronizing phase to meet the conditions for perfect coupling when the torque (Te) reaches a ceiling represented by an upper limit value (T e max ) or a lower limit value (T e min ).
2. The synchronizing method as claimed in claim 1 , wherein the torque (Te) of the electric machine is reduced by adjusting the magnitude of the torque (T ice ) supplied by the combustion engine.
3. The synchronizing method as claimed in claim 2 , wherein when a demanded torque (T e ) demanded of the electric machine is below a minimum torque (T e min ), the primary shafts are slowed with the combustion engine.
4. The synchronizing method as claimed in claim 2 , wherein when a demanded torque (T e ) demanded of the electric machine is above a maximum torque (T e max ) the primary shafts are accelerated with the combustion engine.
5. The synchronizing method as claimed in claim 3 , wherein the processing circuitry is activated in order to slow or accelerate the combustion engine.
6. The synchronizing method as claimed in claim 1 , wherein the first coupling or the second coupling is one of a dog clutch, synchromesh, or progressive or non-progressive coupling.
7. A device comprising:
processing circuitry configured to adjust a magnitude of torque (T ice ) supplied by a combustion engine thereby synchronizing a speed ( ω p) common to two concentric primary shafts of a hybrid transmission cumulatively receiving the torque (T ice ) from the combustion engine and torque (Fe) from an electric machine in a hybrid mode of operation in which the two concentric primary shafts are rotationally connected by a first coupling, with the speed ( ω s) of a secondary transmission shaft bearing at least one idler pinion, to allow one of the at least one pinion to be coupled to the secondary transmission shaft by closure of a second coupling with no mechanical synchronizing members.
8. The synchronizing device as claimed in claim 7 , wherein the processing circuitry is further configured to influence the magnitude of the torque (Te) of the electric machine by reducing the torque (Te) hen a demanded torque (T e ) demanded of the electric machine is higher than a maximum torque (T e max ) supplied by the combustion engine.
9. The synchronizing device as claimed in claim 8 , wherein when the demanded torque (T e ) demanded of the electric machine is below a minthium torque (T e max ), the processing circuitry is configured to slow down the electric machine along with the combustion engine until the demanded torque T e becomes higher than the minimum torque (T e min ).
10. The synchronizing device as claimed in claim 8 , wherein when the demanded torque (T e ) demanded of the electric machine is higher than a maximum torque (T e max ) the processing circuitry is configured to accelerate the electric machine along with the combustion engine until the demanded torque (T e ) of the electric machine becomes lower than the max torque (T e max ).
11. The synchronizing device as claimed in claim 9 , wherein the processing circuitry is further configured to deliver a combustion engine torque setpoint (T ice ) allowing the primary speed to he synchronized with the secondary speed to meet the conditions of perfect coupling between a secondary pinion and the secondary transmission shaft.
12. The synchronizing device as claimed in claim 7 , wherein the processing circuitry is further configured to keep an electric torque request (T e appli ) between a minimum torque value (T e min ) and a maximum (T e max for the electric machine.
13. The synchronizing device as claimed in claim 7 , wherein the processing circuitry is further configured to deliver a torque setpoint applied to the combustion engine (T ice appli ) that is between minimum and maximninr values (T ice min :T ice max ).