Hyundai Motor Company

Kia Motors Corporation

Donghwan Hwang

JongSool Park

Changwook Lee

Wonmin Cho

Kangsoo Seo

Horim Yang

Jaechang Kook

Youngmin Yoon

A power transmission system of a hybrid electric vehicle may include an input shaft, an output shaft, a first planetary gear set having three rotation elements, a second planetary gear set having three rotation elements, a third planetary gear set, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, and a seventh rotational shaft such that the power transmission system can suppress conversion to an ENG mode by providing sufficient power performance at the time of wide open throttle (WOT) launching and maximally use power of an engine at the time of conversion to a first HEV mode and a third HEV mode.

Power transmission system of hybrid electric vehicle

A power transmission system of hybrid electric vehicle includes an input shaft, counter shaft, an output shaft, first motor/generator, second motor/generator, first planetary gear set, second planetary gear set to selectively externally gear-connect fourth rotation element to third rotation element through counter shaft while being directly connected to counter shaft and to directly connect fifth rotation element to output shaft and selectively connect sixth rotation element to transmission housing, first transfer gear disposed between second rotation element and output shaft, second transfer gear disposed between third rotation element and counter shaft, variable direct connection device to selectively connect two of three rotation elements of second planetary gear set, and variable connection device to selectively connect sixth rotation element to transmission housing or selectively external gear-connect third rotation element to fourth rotation element.

A power transmission system of a hybrid electric vehicle may include an input shaft to which power from an engine is input, an output shaft, a planetary gear set including a first rotation element being driven by electrical driving force, a second rotation element being externally engaged with the output shaft as an output element, and a third rotation element being driven by rotational power of an engine, a first motor/generator directly connected to the first rotation element of the planetary gear set, a second motor/generator selectively externally engaged with the output shaft, a first transfer gear, a second transfer gear, a variable connecting unit selectively connecting the first transfer gear to the input shaft or the output shaft, and a variable direct coupling unit selectively connecting two rotation elements among the three rotation elements, of the planetary gear set.

A power transmission system of a hybrid electric vehicle may include an input shaft, an output shaft, a first planetary gear set having three rotation elements, a second planetary gear set having three rotation elements, a third planetary gear set, a first shaft, a second shaft, a third shaft, a fourth shaft, a fifth shaft, a sixth shaft, and a seventh rotational shaft such that the power transmission system can suppress conversion to an Engine (ENG) mode by providing sufficient power performance at the time of wide open throttle (WOT) launching and maximally use power of an engine at the time of conversion to a first Hybrid-Electric Vehicle (HEV) mode and a third HEV mode.

A power transmission system of a hybrid electric vehicle may includes an input shaft, a first planetary gear set disposed on the input shaft while including three rotation elements having a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear; first to seventh rotation shafts, and three friction elements configured to selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid vehicle includes an input shaft, an output shaft, a first planetary gear set, a second planetary gear set, a third planetary gear set, a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft, a fifth rotational shaft, a sixth rotational shaft, a seventh rotational shaft, and three friction elements selectively connecting the rotational shafts to each other or selectively connecting the respective rotational shafts and the transmission housing such that the power transmission system can suppress conversion to an ENG mode by providing sufficient power performance upon wide open throttle (WOT) launching and maximally use power of an engine upon conversion to a first HEV mode and a third HEV mode.

A planetary gear train of an automatic transmission for a vehicle may include an input shaft, an output shaft, three planetary gear sets, three transfer gears, and six friction elements. Each of the three planetary gear sets may include three rotation elements, constituting nine rotational elements. The rotational elements may be connected or selectively connected to the input shaft, a transmission housing or each other by an external gear or by the six friction elements. The three transfer gears may be applied to the external gear.

Planetary gear train of automatic transmission for vehicles

A power transmission system of a hybrid electric vehicle includes an input shaft a first planetary gear set disposed on the input shaft while having a first sun gear, a first planetary carrier, and a first ring gear, a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear, a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear, first to sixth rotation shafts and three friction elements selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid electric vehicle may include an input shaft, an output gear disposed on the input shaft, a first planetary gear set having a first sun gear, a first planetary carrier, and a first ring gear; a second planetary gear set having a second sun gear, a second planetary carrier, and a second ring gear; a third planetary gear set having a third sun gear, a third planetary carrier, and a third ring gear; first to seventh rotation shafts, and three friction elements configured to selectively connect the respective rotation shafts to each other or selectively connect the respective rotation shafts to the transmission housing.

A power transmission system of a hybrid electric vehicle includes: an input shaft; an output shaft; first, second and third planetary gear sets; a first rotational shaft, a second rotational shaft, a third rotational shaft, a fourth rotational shaft; a fifth rotational shaft; a sixth rotational shaft; and three friction elements mutually selectively connecting rotational shafts to each other or selectively connecting the respective rotational shafts and the transmission housing such that the power transmission system of the hybrid electric vehicle can suppress conversion to an ENG mode by providing sufficient power performance at a time of wide open throttle (WOT) launching and maximally use power of an engine at a time of conversion to a first HEV mode and a third HEV mode.

A method protects a starting clutch. The method generates an estimated equivalent temperature of the starting clutch and performs an operation for protecting the starting clutch if the estimated temperature exceeds critical temperature, in order to prevent the burnout of the starting clutch caused by excessive slip under severe conditions. A system implementing the method is also described.

Growing community of inventors

Seoul, South Korea

Donghwan Hwang