A rotary control valve includes: a rotor including a tubular part and an opening in the tubular part; a seal member including a contact face, an internal passage, a noncontact part, and a ridge; a biasing member structured to cause the contact face of the seal member to be pressed on the tubular part; and a drive mechanism structured to rotate the rotor. The contact face is structured to be in sliding contact with the tubular part, and has an arc-curved surface shaped to fit with an outer periphery of the tubular part. The internal passage is structured to communicate with the opening of the tubular part. The noncontact part is formed at least one of ends of the arc-curved surface in a rotational direction of the tubular part, and is structured to be out of contact with the tubular part so as to define the ridge.

A vehicle heating/cooling system has first and second fluid circulation loops for circulating engine coolant and automotive fluid. A first heat exchanger transfers heat from the coolant to air for the passenger compartment. A second heat exchanger transfers heat between the coolant and automotive fluid. A first valve has first and second inlets for receiving coolant from hot and cold coolant sources, and an outlet for discharging coolant to the second heat exchanger. A second valve has an inlet for receiving coolant from the first coolant source, and an outlet for discharging coolant to the first inlet of the first valve. The valve positions change with temperature of the coolant and the automotive fluid, providing preferential heating of the passenger compartment during cold start-up of the vehicle. The second heat exchanger and valves may be provided in a temperature control module.

In order to shift a rotation angle of a rotor to a region of a normal mode (for example, a region c) from a region of a heater cut mode (for example, a region e), the rotation angle needs to pass through a region where a flow rate of a refrigerant which is caused to flow through all branch channels becomes zero (a region d). When the refrigerant has a high temperature, there is a possibility of the refrigerant being not cooled, and boiling. Therefore, when a request to switch a normal mode and a heater cut mode is issued, permission/non-permission of switch of the mode is determined by comparison of a temperature of the refrigerant detected by the temperature sensor 26 and an upper limit temperature of the refrigerant.

A multi-mode powertrain system is described, and includes an internal combustion engine having stop/start capability. A method for controlling the multi-mode powertrain system includes circulating coolant to a heater core via an engine fluidic circuit that includes a water jacket of the internal combustion engine when temperature of the coolant is less than an engine fluidic circuit upper temperature threshold and the engine is in an ON state. Coolant is circulated to the heater core via a bypass fluidic circuit that excludes the water jacket of the internal combustion engine when temperature of the coolant is greater than a bypass fluidic circuit lower temperature threshold when the engine is in an OFF state.

A heat system for an electric or hybrid vehicle may be operated in multiple operating modes. The heat system includes a cooling circuit having a cooling unit and a heating heat exchanger for heating the interior. The heating heat exchanger is parallel connected to the cooling unit, for forming a heating circuit. At least one heat source is arranged in the cooling circuit for heat output to the cooling circuit. The heat system may also include a refrigeration circuit for heat exchange with the cooling circuit by way of a capacitor, and an evaporator circuit, which can introduce heat to the refrigeration circuit by way of the evaporator.

An engine having a water jacket may include a cylinder block where cylinder liners in which pistons are disposed are arranged in a length direction, a first water jacket being provided to surround the cylinder liners, and a second water jacket provided in the length direction at an exhaust side, separately from the first water jacket, and a cylinder head disposed above the cylinder block, and including a head water jacket provided therein along a length direction thereof, wherein an exhaust side of the head water jacket receives coolant from the second water jacket through connection paths.

A thermal management system for a vehicle is disclosed, wherein the vehicle comprises an occupant compartment and a propulsion system configured to provide motive power to the vehicle. The system comprises a propulsion coolant circuit configured to cool at least a portion of the propulsion system, a heating circuit configured to heat the occupant compartment, and a heat pump circuit comprising a first evaporator in the propulsion coolant circuit and a condenser in the heating circuit. The propulsion coolant circuit comprises a connecting conduit connecting the propulsion coolant circuit to the heating circuit at a position upstream of the condenser, and a first valve configured to control flow of coolant through the connecting conduit. The present disclosure further relates to a powertrain for a vehicle, as well as a vehicle.

An engine cooling system has a coolant control valve unit and includes a cylinder head disposed on a cylinder block. The coolant control valve unit is configured to receive coolant from a coolant outlet side of the cylinder head to control coolant distributed to a heater and a radiator and to control coolant exhausted from the cylinder block. A control unit is configured to determine a heating priority mode according to operation conditions and to substantially open a first coolant passage corresponding to the heater by controlling the coolant control valve unit in the heating priority mode.

An in-vehicle temperature control system includes: a heater core used to heat an inside of a vehicle cabin using heat of a heat medium; a first heating unit that heats the heat medium using exhaust heat of an internal combustion engine; a thermal circuit configured to circulate the heat medium between the heater core and the first heating unit; a distribution state switching mechanism that switches a distribution state of the heat medium between a first distribution state and a second distribution state; and a control device that controls the distribution state switching mechanism, wherein: the thermal circuit includes a bypass flow path disposed in parallel with the heater core.

A wall temperature acquisition unit acquires a wall temperature of an internal combustion engine. A wall temperature adjustment unit adjusts the wall temperature. A ratio adjustment unit adjusts a gas ratio that is acquired by dividing a mass flow amount of gas supplied to the internal combustion engine by a mass flow amount of fuel supplied to the internal combustion engine. The wall temperature adjustment unit performs a low wall temperature control to maintain the wall temperature at a low temperature when the internal combustion engine is at a high load and a high wall temperature control to maintain the wall temperature at a high temperature when the internal combustion engine is at a low load. The ratio adjustment unit adjusts the gas ratio based on the wall temperature, when switching between the low wall temperature control and the high wall temperature control is performed.