Patent claim: The vehicle according to claim 13 wherein the controller performs the drive control of the vehicle based on the operation parameter and the selected operation mode of the vehicle by after entering the HEVeco lowelectricquantity mode determining whether the speed of the vehicle is less than or equal to a fourth speed thresholdif the speed of the vehicle is less than or equal to the fourth speed threshold determining whether the required power of the vehicle is less than or equal to a first power threshold if the required power of the vehicle is less than or equal to the first power threshold controlling the synchronizer to disengage operating the second motor generator with the required power and controlling the engine unit to drive the first motor generator with the first power threshold to generate electricity if the required power of the vehicle is greater than the first power threshold determining whether the required power of the vehicle is less than or equal to a second power threshold if the required power of the vehicle is less than or equal to the second power threshold controlling the synchronizer to engage operating the engine unit with the required power and controlling the first and second motor generators to stop if the required power of the vehicle is greater than the second power threshold determining whether the required power of the vehicle is less than or equal to a sum of the second power threshold and a third power threshold if the required power of the vehicle is less than or equal to the sum of the second power threshold and the third power threshold controlling the synchronizer to engage operating the engine unit with the second power threshold operating the second motor generator with a difference between the required power and the second power threshold and controlling the first motor generator to stop if the required power of the vehicle is greater than the sum of the second power threshold and the third power threshold determining whether the required power of the vehicle is less than or equal to a sum of the second power threshold the third power threshold and a fourth power threshold if the required power of the vehicle is less than or equal to the sum of the second power threshold the third power threshold and the fourth power threshold controlling the synchronizer to engage operating the engine unit with the second power threshold operating the second motor generator with the third power threshold and operating the first motor generator with a difference between the required power and the sum of the second power threshold and the third power threshold if the required power of the vehicle is greater than the sum of the second power threshold the third power threshold and the fourth power threshold controlling the synchronizer to engagecalculating an operation power of the second motor generator according to the required power the second power threshold the third power threshold and the fourth power threshold operating the second motor generator with the operation power operating the engine unit with the second power threshold and operating the first motor generator with a difference between the required power and a sum of the second power threshold and the operation power if the speed of the vehicle is greater than the fourth speed threshold determining whether the required torque of the vehicle is less than or equal to a fourth torque threshold if the required torque of the vehicle is less than or equal to the fourth torque threshold controlling the synchronizer to engage operating the engine unit with a predetermined torque driving the first motor generator with a part of the torque of the engine unit to generate electricity and controlling the second motor generator to stop if the required torque of the vehicle is greater than the fourth torque threshold determining whether the required torque of the vehicle is less than or equal to a sum of the first torque threshold and the fourth torque threshold if the required torque of the vehicle is less than or equal to the sum of the first torque threshold and the fourth torque threshold controlling the synchronizer to engage operating the engine unit with the fourth torque threshold operating the second motor generator with a difference between the required torque and the fourth torque threshold and controlling the first motor generator to stop if the required torque of the vehicle is greater than the sum of the first torque threshold and the fourth torque threshold determining whether the required torque of the vehicle is less than or equal to a sum of the first torque threshold the second torque threshold and the fourth torque threshold if the required torque of the vehicle is less than or equal to the sum of the first torque threshold the second torque threshold and the fourth torque threshold controlling the synchronizer to engage operating the engine unit with the fourth torque threshold operating the second motor generator with the first torque threshold and operating the first motor generator with a difference between the required torque and the sum of the first torque threshold and the fourth torque threshold if the required torque of the vehicle is greater than the sum of the first torque threshold the second torque threshold and the fourth torque threshold controlling the synchronizer to engagecalculating a fourth operation torque of the second motor generator according to the required torque the first torque threshold the second torque threshold and the fourth torque threshold operating the second motor generator with the fourth operation torque operating the engine unit with the fourth torque threshold and operating the first motor generator with a difference between the required torque and a sum of the fourth operation torque and the fourth torque threshold.

Related passage: In order to transmit the torque from the engine 1 to the low speed engineside gear 4 and the high speed engineside gear 6 it is needed to cause the hub 7 to move in the axial direction of the input shaft 40 and to couple directly the hub 7 to the mating gear 3 or the mating gear 5 through the low speed synchronizer ring 8 or the high speed synchronizer ling 9 respectively.To transfer the hub 7 a hydraulic actuator 27 is used which is controlled by a dog clutch controlling device 36.Herein a clutch mechanism comprising the hub 7 the mating gear 3 the mating gear 5 the low speed synchronizer ring 8 and the high speed synchronizer ring 9 is referred to as a dog clutch.This clutch mechanism enables to transmit energy from a power source such as the engine 1 to a tier 25 with high efficiency thereby to provide low fuel consumption.