A system comprises a powertrain including an engine configured to output torque to a driveline, and an electronic control system operatively coupled with the powertrain. The electronic control system is configured to determine an engine torque value, and control a component of the driveline in response to the engine torque value. The engine torque value may account for an effect of air-fuel ratio (AFR) on engine torque. The engine torque value may account for an effect of charge transport delay on engine torque

A method to detect whether combustion is taking place in an internal combustion engine of a hybrid vehicle during operation of the hybrid vehicle, whereby a decoupler is provided between the internal combustion engine and an electric machine that serves to power the hybrid vehicle, comprising opening the decoupler between the internal combustion engine and the electric machine, receiving a speed signal when the decoupler is open, said signal indicating a rotational speed of the internal combustion engine when the decoupler is open, and determining, on the basis of the speed signal when the decoupler is open, whether combustion is taking place in the internal combustion engine. The present invention also relates to a control device to carry out the method according to the invention.

A method of controlling a clutch for vehicle may include determining, by a controller, raised offset engine torque, when engine torque is raised to a reference torque or more in an engine idle state, and controlling, by the controller, the clutch based on the determined offset engine torque.

A vehicle includes a clutch to couple a motor and transmission, and a controller that, in response to a regenerative braking request and a temperature being within a first range, partially capacitizes the clutch for regenerative torque transfer therethrough with slip, and in response to another regenerative braking request and the temperature being within a second range less than the first, fully capacitizes the clutch prior to regenerative torque transfer therethough to preclude slip.

A vehicle system includes an engine, a transmission including a torque converter, a clutch configured to selectably couple and decouple the torque converter, and a gearset, a selective catalytic reduction (SCR) exhaust aftertreatment system. An electronic control system may be operatively coupled with the engine, the electronically controllable clutch, and the SCR exhaust aftertreatment system. The electronic control system is configured to evaluate whether an SCR catalyst temperature satisfies at least one minimum temperature criterion, in response to the SCR catalyst temperature satisfying the minimum temperature criterion, permit a neutral at stop operation wherein the electronically controllable clutch is controlled to selectably decouple the torque converter and the one or more gears at least in part in response to the vehicle system being in a stopped state, and in response to the SCR catalyst temperature not satisfying the minimum temperature criterion, prevent the neutral at stop operation.

A vehicle system includes an engine, a transmission including a torque converter, a clutch configured to selectably couple and decouple the torque converter, and a gearset, a selective catalytic reduction (SCR) exhaust aftertreatment system. An electronic control system may be operatively coupled with the engine, the electronically controllable clutch, and the SCR exhaust aftertreatment system. The electronic control system is configured to evaluate whether an SCR catalyst temperature satisfies at least one minimum temperature criterion, in response to the SCR catalyst temperature satisfying the minimum temperature criterion, permit a neutral at stop operation wherein the electronically controllable clutch is controlled to selectably decouple the torque converter and the one or more gears at least in part in response to the vehicle system being in a stopped state, and in response to the SCR catalyst temperature not satisfying the minimum temperature criterion, prevent the neutral at stop operation.

A power control system is provided for a work vehicle with an engine. A combination starter-generator device has an electric machine and a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in two power flow directions. The gear set operates in one of multiple relatively high-torque, low-speed start gear ratios in one direction, including a first start gear ratio corresponding to a cold engine start mode and a second start gear ratio corresponding to a warm engine start mode, and in a relatively low-torque, high-speed gear ratio in another direction corresponding to a generation mode. First and second clutch assemblies are selectively coupled to the gear set to effect the start gear ratios during the engine start modes. A control valve is fluidly coupled to selectively apply a fluid pressure to the clutch assemblies.

A power control system is provided for a work vehicle with an engine. A combination starter-generator device has an electric machine and a gear set configured to receive rotational input from the electric machine and the engine and to couple the electric machine and the engine in two power flow directions. The gear set operates in one of multiple relatively high-torque, low-speed start gear ratios in one direction, including a first start gear ratio corresponding to a cold engine start mode and a second start gear ratio corresponding to a warm engine start mode, and in a relatively low-torque, high-speed gear ratio in another direction corresponding to a generation mode. First and second clutch assemblies are selectively coupled to the gear set to effect the start gear ratios during the engine start modes. A control valve is fluidly coupled to selectively apply a fluid pressure to the clutch assemblies.

The present invention relates to a method to detect whether combustion is taking place in an internal combustion engine (10) of a hybrid vehicle during operation of the hybrid vehicle, whereby a decoupler (13) is provided between the internal combustion engine (10) and an electric machine (12) that serves to power the hybrid vehicle. The method comprises opening (31) the decoupler between the internal combustion engine (10) and the electric machine (12), receiving (32) a speed signal when the decoupler is open (13), said signal indicating a rotational speed of the internal combustion engine (10) when the decoupler (13) is open, and determining (33, 38), on the basis of the speed signal when the decoupler (13) is open, whether combustion is taking place in the internal combustion engine (10). The present invention also relates to a control device to carry out the method according to the invention.

A vehicle includes a clutch to couple a motor and transmission, and a controller that, in response to a regenerative braking request and a temperature being within a first range, partially capacitizes the clutch for regenerative torque transfer therethrough with slip, and in response to another regenerative braking request and the temperature being within a second range less than the first, fully capacitizes the clutch prior to regenerative torque transfer therethough to preclude slip.