125 results about "Exhaust heat recovery system" patented technology

The thermoelectric conversion module is provided, comprising a plurality of thermoelectric elements, and respective thermoelectric elements are electrically connected by metal caps attached to both ends of each thermoelectric element. In addition, the metal cap may be integrally formed with electrodes on both ends of each thermoelectric element.

An exhaust heat recovery system (EHRS) for a vehicle is provided that is operable to direct coolant heated by exhaust heat to a vehicle transmission under certain operating conditions after the engine is adequately heated by the exhaust heat and without further heating the engine with the exhaust heat. Thus, recovery of exhaust heat is increased as the transmission is heated to a higher operating temperature than the engine using the heated coolant. The EHRS may also operate in a bypass mode during which exhaust heat is not directed to the engine or the transmission. A method of managing exhaust heat is also provided.

An exhaust-heat recovery system includes a catalytic converter, an exhaust heat exchanger, an air conditioner and an engine controller. The catalytic converter is such that exhaust discharged from an engine passes therethrough and combustible components in the exhaust are catalytically burned therein. The exhaust heat exchanger induces heat exchange between the exhaust having passed through the catalytic converter and a coolant having passed through the engine. The air conditioner generates a heating wind by means of the heat exchange between the coolant having passed through the exhaust heat exchanger and an air conditioning wind. The engine controller controls incrementally the combustible components in the exhaust to be burned in the catalytic converter when a prescribed heating condition is unsatisfied.

In an exhaust heat recovery system, electric power generation efficiency of a thermoelectric conversion element can be improved, and warming-up of a catalyst can be completed early, without using a complicated device. The exhaust heat recovery system according to the invention includes an exhaust pipe in which exhaust gas discharged from an internal combustion engine flows; a catalyst which purifies the exhaust gas; a heat recovery portion which is fitted to the exhaust pipe, and which recovers heat contained in the exhaust gas; a thermoelectric conversion element which generates electric power using thermoelectric conversion; and a heat pipe which connects the heat recovery portion to the thermoelectric conversion element, and which transfers the heat recovered in the heat recovery portion to the thermoelectric conversion element. An operation starting temperature of the heat pipe is set so as to be higher than an activation temperature of the catalyst.

An ECU executes a program including the steps of: when a switching valve is controlled to be closed, comparing exhaust gas's temperature, as detected, with a map value; if the exhaust gas's temperature is larger than the map value, determining that the switching valve normally operates; and if the exhaust gas's temperature is smaller than the map value, determining that the switching valve has abnormality.

An exhaust heat recovery device may include a radiator disposed at a main line and through which hot coolant circulates, an exhaust heat exchanger transferring exhaust heat of an engine to coolant, a first valve selectively circulating the coolant to the main line or a bypass line, a water pump connected to the first valve and circulating the coolant, a coolant temperature sensor detecting temperature of the coolant, a second valve connected to the water pump and disposed at a distributing line to distribute the coolant supplied by the water pump to the engine and the exhaust heat exchanger, and a control portion that controls the first and second valves depending on the temperature of the coolant so as to adjust coolant amount circulating in the engine and the exhaust heat exchanger and coolant amount circulating in the radiator and the bypass line.

An exhaust heat recovery system (EHRS) for a vehicle is operable to direct exhaust heat to a vehicle transmission under certain operating conditions. In some embodiments, the EHRS may also direct exhaust heat to a heater for vehicle passenger compartment. Preferably, the EHRS is controllable to manage available exhaust heat according to vehicle operating conditions, by prioritizing the heat flow among the engine, the transmission, and the vehicle heater. The EHRS may also operate in a bypass mode during which exhaust heat is not directed to the engine, the transmission or the vehicle heater. A method of managing exhaust heat recovery on a vehicle having an EHRS is also provided.

Provided is a ferritic stainless steel for heat pipes of high-temperature exhaust heat recovery systems, which comprises, in terms of % by mass, from 16 to 32% of Cr, at most 0.03% of C, at most 0.03% of N, at most 3% of Si, at most 2% of Mn, at most 0.008% of S, from 0 to 0.3% of Al, and at least one of at most 0.7% of Nb, at most 0.3% of Ti, at most 0.5% of Zr and at most 1% of V, and optionally at least one of at most 3% of Mo, at most 3% of W, at most 3% of Cu, at most 0.1% of Y, at most 0.1% of REM (rare earth metal) and at most 0.01% of Ca, with a balance of Fe and inevitable impurities, and which satisfies at least the following formula (1), formula (2) and formula (5):

Cr+3(Mo+Cu)≧20  (1)

Cr+3(Si+Mn+Al−Ti)≧20  (2)

0.037{(C+N)/(V+Ti+0.5Nb+0.5Zr)}+0.001≦0.01  (5).

The exhaust heat recovery system of the invention includes: a thermoelectric conversion element that generates electric energy by thermoelectric conversion using heat of exhaust gas discharged from an engine; and a heat pump including a heat recovery unit that absorbs the heat contained in the exhaust gas through an endothermic reaction using a heating medium, and a heat generation unit which generates heat through an exothermic reaction of the heating medium and which supplies the heat to the thermoelectric conversion element. With this configuration, the thermoelectric conversion element and the heat generation unit are movably attached to each other such that they can be placed in contact with and separated from each other, and the heat recovery unit is positioned in an exhaust gas passage in an exhaust gas downstream flow direction from the heat generation unit.

A cooling system controller controls a cooling system at least having a coolant pump (3) configured to supply a coolant to an internal combustion engine, a heat radiator (9) configured to cool the coolant, and an exhaust heat recovery system (6) configured to perform in heat exchange between the exhaust gas and the coolant. In addition, the cooling system controller (12) has a unit configured to control the coolant flow rate, a unit (13) configured to obtain a coolant temperature or pressure of the internal coolant passage of the engine, and a unit configured to obtain an internal coolant temperature or pressure of the exhaust heat recovery system. Furthermore, the coolant flow rate is restricted at a cold start of the internal combustion engine, and the restriction of the coolant flow rate is released on the basis of the coolant temperature or pressure of the engine coolant passage and the internal coolant temperature or pressure of the exhaust heat recovery system.

Systems and methods are described for heating engine coolant by transferring heat from an exhaust flow to the engine coolant via a heat exchanger positioned in an exhaust gas heat recovery line coupled to the EGR cooler responsive to an EGR valve position. In one particular example, a branching pathway of the EGR cooler is positioned downstream of the EGR cooler and allows exhaust gas to be routed to the EGR cooler and/or exhaust gas heat exchanger based on the EGR valve position, which allows for control of the amount of heat transferred to the engine coolant as well as exhaust gas recirculation into the engine. With this arrangement, a cabin temperature of a hybrid vehicle may be increased as quickly as possible under cold start conditions to allow the engine to be quickly turned off after heating the vehicle cabin.

A cooling circuit for internal combustion engines includes an internal combustion engine, a pressure-feeding unit for feeding coolant, which cools the internal combustion engine under pressure, a valve unit having a plurality of heat exchangers connected in parallel thereto, an exhaust heat recovery system for recovering heat from exhaust air of the internal combustion engine by the coolant, a first circulation circuit including the pressure-feeding unit, the valve unit and the exhaust heat recovery system, and a second circulation circuit including the pressure-feeding unit and the exhaust heat recovery system.

An exhaust heat recovery system 25 provided with a plurality of heat pipes 60, 61 provided with heat recovery parts 60a, 61a and heat exchange parts 60b, 61b. The heat pipes recover heat from exhaust gas exhausted from an internal combustion engine at the heat recovery parts and transfer this recovered heat to an object to be heated at the heat exchange parts. The heat recovery part 60a of the first heat pipe 60 recovers heat from the exhaust gas at an exhaust purification catalyst 20′ provided in an engine exhaust passage or its upstream side. The heat recovery part 61b of the second heat pipe 61 recovers heat from the exhaust gas at the downstream side of the exhaust purification catalyst. Due to this, there is provided an exhaust heat recovery system which can recover at least a fixed amount of exhaust heat at all times while maintaining a warm-up performance of the exhaust purification catalyst.

Disclosed are a control method and a control device for an exhaust heat recovery system which are capable of preventing an onboard supply power outage in response to a sharp change in the load of the main drive machine. For an exhaust heat recovery system for which a portion of the exhaust gas generated by the ship's main drive machine is supplied to a gas turbine and the amount of heat of the exhaust gas exhausted by the gas turbine is conducted to an exhaust gas economizer, this control method and control device: obtain an estimated or calculated current reserve amount of heat (Q), which is based on the heat energy detection signal of the exhaust gas economizer; obtain, based on the operation state of an auxiliary electrical generator and on the onboard power demand, a reference amount of heat (Q_min), which is required to maintain the requisite power until the auxiliary electrical generator starts up; compare the current reserve amount of heat (Q) and the reference amount of heat (Q_min); and, based on the result of the comparison, select the operating state of the auxiliary electrical generator from either stop, idle or driving operation.

Provided is a method for controlling and diagnose an exhaust gas heat exchanger. The method includes measuring air mass flow, engine coolant temperature (ECT), exhaust gas temperature (EGT), heat exchanger coolant temperature (HECT), and engine speed; and operating a valve to selectively provide exhaust gas flow through the exhaust gas heat exchanger based on air mass flow, ECT, EGT, HECT, and engine speed. A vehicle has an engine and an exhaust heat recovery system with an exhaust gas heat exchanger and a valve configured to control exhaust gas flow. A controller for the vehicle is configured to (i) measure air mass flow, ECT, EGT, HECT, and engine speed, and (ii) operate the valve to selectively provide exhaust gas flow through the exhaust gas heat exchanger based on air mass flow, ECT, EGT, HECT, and engine speed.

The invention provides a heat recovery super heat pump system for an electric vehicle. The heat recovery super heat pump system comprises the components of a power pump, a motor driver, a driving motor, a storage battery, a three-way stop valve, a first electric vehicle external heat exchanger, a second electric vehicle external heat exchanger, a compressor, a four-way valve, a first electric vehicle internal heat exchanger, a second electric vehicle internal heat exchanger, a throttling element, a control valve and an electric heater. The heat recovery super heat pump system for the electric vehicle comprises an electric heating system, a new air exhausting heat recovery system, a waste heat recovery system and a super heat pump system. The electric heating system, the new air exhausting heat recovery system, the waste heat recovery system and the super heat pump system are respectively formed by connecting parts of the components in sequence to form an integrated circulation system. According to the heat recovery super heat pump system for the electric vehicle, heat emitted by an electric vehicle air conditioner internal radiating system and waste gas exhausted by an air conditioner can be sufficiently recycled and reused, and resource waste is reduced.