公开(公告)号：US10851892B2

公开(公告)日：2020-12-01

申请号：US16305354

申请日：2017-06-12

Applicant: Perkins Engines Company Limited

Inventor： Michael Beyer

IPC: F16H61/66 ,  F16H61/468 ,  F16H61/472 ,  F16H63/50 ,  F16H59/70 ,  F16H37/08 ,  F16H59/36

Abstract: A method is provided for estimating input torque and output torque in a continuously variable transmission having a variator. The method comprising the steps of determining (202) a transmission Input and/or output speed, calculating (204) the speed of each of a plurality of transmission components by reflecting the transmission input and/or output speed through the transmission to each of the plurality of transmission components, and calculating (208) the speed rate of change of each of the plurality of transmission components. The inertia torque of each of the plurality of transmission components is calculated (210) based upon its respective speed rate of change and a predetermined component inertia value (209). The method further comprises the steps of determining (211) a motor torque of the variator, and calculating (212) a transmission input torque and transmission output torque by reflecting the motor torque of the variator through the transmission to the transmission input and output. The calculated transmission Input and output torque values are adjusted (214) to account for the calculated inertia torque values of those of the plurality of transmission components which lie between the variator and the transmission input, and the variator and the transmission output, respectively.

公开(公告)号：US11143297B2

公开(公告)日：2021-10-12

申请号：US16306059

申请日：2017-06-12

Applicant: Perkins Engines Company Limited

Inventor： Michael Beyer ,  Steven Spencer

IPC: F16H61/462 ,  F16H63/50 ,  F16H59/70 ,  F16H59/36 ,  F16H47/04

Abstract: According to the present invention, there is provided a method of reducing output torque deficits during the launch of a vehicle having a continuously variable transmission, wherein the variator has an input connected to a prime mover and an output. The method comprises the steps of determining a rate of change of ratio in the transmission, and predicting a required motor speed ratio rate of change value of the variator on the basis of: (i) the determined rate of change of ratio in the transmission, and (ii) the configuration of the transmission. The speed of the variator output is adjusted so as to achieve the required motor speed ratio rate of change value.

公开(公告)号：US11040718B2

公开(公告)日：2021-06-22

申请号：US16648971

申请日：2018-09-17

Applicant: Perkins Engines Company Limited

Inventor： Michael Beyer ,  Michael Cronin ,  Steven Spencer ,  Matthew Mauritzson ,  Kevin Stutzman

IPC: B60W10/02 ,  B60W30/18 ,  B60W10/101 ,  B60W10/18 ,  B60W30/186

Abstract: A launch control method is provided for a vehicle having an accelerator, a brake and a continuously variable transmission (CVT). The method comprises determining: (i) a braking torque set by a vehicle operator by pressing a brake pedal of the vehicle; and (ii) a holding torque required to hold the vehicle in a stationary position. The method also determines that the operator has released the brake pedal. The brake is released whilst engaging a launch clutch of the CVT, wherein the launch clutch is engaged by increasing a clutch engagement pressure at a first pressure ramp rate, such that the sum of the braking torque and a clutch torque of the clutch remains equal to the holding torque. An acceleration torque requested by the operator via the accelerator is determined. The clutch engagement pressure is increased at a second pressure ramp rate when it is determined that the braking torque is substantially zero, such that the clutch torque is increased by the acceleration torque. A fixed minimum pressure ramp rate is stored, wherein the minimum pressure ramp rate increases the clutch engagement pressure towards a maximum engagement pressure. The current pressure ramp rate is compared with the minimum pressure ramp rate, and the clutch engagement pressure is switched to the minimum pressure ramp rate if the current pressure ramp rate is less than the minimum pressure ramp rate.

公开(公告)号：US20200318735A1

公开(公告)日：2020-10-08

申请号：US16305354

申请日：2017-06-12

Applicant: Perkins Engines Company Limited

Inventor： Michael Beyer

IPC: F16H61/468 ,  F16H61/66 ,  F16H61/472 ,  F16H63/50

Abstract: A method is provided for estimating input torque and output torque in a continuously variable transmission having a variator. The method comprising the steps of determining (202) a transmission input and/or output speed, calculating (204) the speed of each of a plurality of transmission components by reflecting the transmission input and/or output speed through the transmission to each of the plurality of transmission components, and calculating (208) the speed rate of change of each of the plurality of transmission components. The inertia torque of each of the plurality of transmission components is calculated (210) based upon its respective speed rate of change and a predetermined component inertia value (209). The method further comprises the steps of determining (211) a motor torque of the variator, and calculating (212) a transmission input torque and transmission output torque by reflecting the motor torque of the variator through the transmission to the transmission input and output. The calculated transmission input and output torque values are adjusted (214) to account for the calculated inertia torque values of those of the plurality of transmission components which lie between the variator and the transmission input, and the variator and the transmission output, respectively.

公开(公告)号：US20190211925A1

公开(公告)日：2019-07-11

申请号：US16306059

申请日：2017-06-12

Applicant: Perkins Engines Company Limited

Inventor： Michael Beyer ,  Steven Spencer

IPC: F16H61/462 ,  F16H47/04 ,  F16H63/50

CPC classification number: F16H61/462 ,  F16H47/04 ,  F16H63/50 ,  F16H2059/363 ,  F16H2059/702 ,  F16H2059/704

Abstract: According to the present invention, there is provided a method of reducing output torque deficits during the launch of a vehicle having a continuously variable transmission, wherein the variator has an input connected to a prime mover and an output. The method comprises the steps of determining a rate of change of ratio in the transmission, and predicting a required motor speed ratio rate of change value of the variator on the basis of: (i) the determined rate of change of ratio in the transmission, and (ii) the configuration of the transmission. The speed of the variator output is adjusted so as to achieve the required motor speed ratio rate of change value.