28 results about "Internal combustion engine cooling" patented technology

This invention relates to the field of hydrogen-powered equipment manufacturing technology, and in particular to a hydrogen internal combustion engine coupling system integrating hydrogen oil cooling and dehydrogenation. Hydrogen-rich oil serves as the core functional medium, simultaneously acting as both a cooling medium for the hydrogen internal combustion engine and a raw material for the dehydrogenation reaction. During its circulation, the hydrogen-rich oil first absorbs low-temperature waste heat from the hydrogen internal combustion engine cylinder for primary preheating, and then recovers high-temperature waste heat from the exhaust gas through an integrated heat exchange unit for further heating. The high-temperature hydrogen-rich oil then enters the dehydrogenation reactor to react and generate hydrogen and lean hydrogen oil. The generated hydrogen is transported to the hydrogen internal combustion engine via a hydrogen supply unit for combustion and power generation, while the lean hydrogen oil flows back to the hydrogen storage unit, achieving a closed-loop circulation of the medium. In this way, on the one hand, by recovering waste heat from the internal combustion engine in stages to heat the dehydrogenation reaction, the potential for thermal energy utilization is fully explored, which is beneficial for improving the system's operational stability and overall energy utilization efficiency; on the other hand, the integrated cooling and dehydrogenation functions are beneficial for improving system integration and lightweighting.

The invention relates to the technical field of outboard engine internal combustion engine cooling, and particularly discloses an open type double-circulation anti-corrosion cooling system which comprises a machine body base, a cover plate is arranged at the bottom of the machine body base, an oil pan is arranged at the bottom of the cover plate, an overwater shell is arranged at the bottom of the oil pan, and an underwater shell is arranged at the bottom of the overwater shell. A water inlet and a water outlet are formed in the underwater shell, a water inlet filter screen is arranged in the water inlet, an anti-blocking mechanism is arranged on the water inlet, a water pump is arranged at the lower end of one side of the oil pan, and the input end of the water pump is connected with the water inlet through a water inlet channel. By arranging a series of structures, the system has two modes of a small circulation cooling system and a large circulation cooling system, large circulation and small circulation are automatically switched in, a cooling medium is seawater, the system is light in weight, good in cooling effect and good in corrosion resistance, a water inlet filter screen is arranged in a water inlet for filtering, a seawater circulation channel of the cooling system is prevented from being blocked, and the service life of the system is prolonged. And the water inlet filter screen is double-sided cleaned and anti-clogging.

The application relates to the field of internal combustion engine cooling jacket die casting technology, in particular to an internal combustion engine cooling jacket die casting forming device, which comprises a middle die mechanism, a hole scrap cleaning mechanism arranged on the middle die mechanism and a casting hole temperature control mechanism arranged in the middle die mechanism; the middle die mechanism comprises a protective outer cover and a plastic mold inner pad arranged on the inner side of the protective outer cover. By arranging the independent middle die mechanism between the movable mold for casting the cylinder head and the fixed mold for casting the cylinder body, when the movable mold is lowered until the middle die mechanism is pressed and locked on the fixed mold, the combined three molds are subjected to high-frequency impact by an energy supply assembly, at this time, the casting material in the double mold cavity can be continuously rammed, during the ramming period, the bubbles in the casting material and the gas in the double mold are driven out, so that the casting material is fully wrapped with the cylinder head casting hole part and the cylinder body casting hole part, and the problem of cold separation or wrinkle of the water jacket hole wall in subsequent forming caused by bubbles or air is avoided.

The invention relates to a chemical regenerative ammonia internal combustion engine fuel cell hybrid power system and a control method, belongs to the technical field of hybrid power systems, and aims at solving the problems that a traditional power system is low in fuel utilization rate and low in energy efficiency, and the system size is large, energy is wasted and the like due to separation of ammonia cracking and an internal combustion engine cooling system. Ammonia fuel serves as a cooling medium of a cylinder sleeve of the internal combustion engine, meanwhile, the fuel is subjected to cracking reaction to generate cracking gas such as hydrogen and nitrogen, and the cracking gas enters the fuel cell to be subjected to electrochemical reaction with air to generate electric energy after doing work and reducing pressure through the expansion turbine. Unreacted fuel components in the tail gas of the fuel cell are introduced into the internal combustion engine for combustion to drive the generator to generate power. According to the invention, integration of chemical heat regeneration and the cracker and the cooling cylinder sleeve of the internal combustion engine is realized. Cracked gas expands to do work and fuel cell tail gas is introduced into the internal combustion engine for combustion, so that gradient utilization of energy is realized, and high fuel utilization rate and high energy efficiency of the power system are further realized.

This relates to a system and method for generating hydrogen from ammonia on a vehicle. [Solution] The present invention relates to a system and method for producing hydrogen from ammonia on a vehicle, wherein the produced hydrogen is used together with ammonia as a fuel source for an internal combustion engine. The present invention utilizes ammonia not only as a co-fuel for the engine but also as a heat exchange medium used in a cooling system for the internal combustion engine, thereby transferring heat from the high-temperature engine coolant to the ammonia, which cools the engine coolant and preheats the ammonia into a gaseous state, providing a system and method for producing hydrogen from ammonia on a vehicle for use as a fuel source for an internal combustion engine.

Coolant pumps for internal combustion engines with a drive shaft (18), a coolant pump impeller (20) which is fixedly arranged on the drive shaft (18) at least rotationally fixed and through which coolant can be conveyed and an adjustable control slide (58) via which a flow cross-section of an annular gap (62) between an outlet (64) of the coolant pump impeller (20) and the surrounding conveying channel (12) can be controlled are known. In order to achieve a reliable seal between the two opposing pressure chambers (92, 94), particularly in the case of purely hydraulic adjustment, it is proposed that the control slide (58) has an inner hollow cylindrical circumferential wall (84) with a radial groove (86) on its radial inside, in which a sealing ring (88) is arranged, and an outer hollow cylindrical circumferential wall (60) with a radial groove (74) on its radial outside, in which a sealing ring (76) is arranged, wherein the two circumferential walls (60, 84) are connected to each other via a base (80).

Transmission device between an engine and a fan comprises an input device, configured to be driven in rotation by the engine, and an output device, configured to be linked to the fan so as to drive the fan in rotation. Advantageously, the transmission device also comprises a first clutch, which is linked to the output device, a second clutch, which is linked to the input device, a shaft, which connects mechanically the first clutch to the second clutch, and an electric motor, which is arranged on the shaft between the first clutch and the second clutch. The first clutch and the second clutch are switchable, between their respective open and closed states, independently from each other.

Regardless of differences in intake air volume during fuel cut-off, it suppresses torque shock at the start of fuel cut-off. [Solution] When cutting fuel during accelerator release, the time required TX for the torque to decrease to the F / C permitted torque TP after accelerator release is calculated based on the F / C target air amount GA*, which is the target value of the intake air amount during fuel cut, and the engine water temperature THW, which is the coolant temperature of the internal combustion engine (S100~S130). Then, when the elapsed time after accelerator release is equal to or greater than the required time TX (S140: YES), fuel cut is initiated (S150).

The present invention provides a cooling system for an internal combustion engine that allows a cooling pump, which supplies cooling water to an additive valve located in the exhaust path of the internal combustion engine and which adds an additive to the exhaust, to be operated as needed even after the internal combustion engine has stopped operating. [Solution] The cooling system for the internal combustion engine includes a cooling water temperature correlation value acquisition unit (86) that acquires a cooling water temperature correlation value that correlates with the temperature of the cooling water near an additive valve (41) located in the exhaust path (3), an exhaust temperature correlation value acquisition unit (85) that acquires an exhaust temperature correlation value that correlates with the temperature of the exhaust gas near the additive valve in the exhaust path (3), and a control unit (7) that operates a cooling pump (6) that supplies cooling water to the additive valve in response to a cooling request. The control unit determines that a cooling request has occurred when the cooling water temperature correlation value is greater than a first temperature threshold and the exhaust temperature correlation value is greater than a second temperature threshold after the internal combustion engine (1) has stopped operating.

An off-road vehicle includes: an internal combustion engine; a circulation passage in which cooling liquid that cools the internal combustion engine flows; a first radiator that is located behind an outside air introduction opening in a front space, is interposed in the circulation passage, and includes a first heat exchange core; and a second radiator that is located behind the first radiator in the front space, is interposed in the circulation passage, and includes a second heat exchange core. The first radiator is located such that the first heat exchange core overlaps the second heat exchange core from a front side.

Internal combustion engine processes, including: Setting an internal combustion engine torque actuator based on the internal combustion engine oil temperature (EOT), estimated by applying an excitation signal, comprising a pulse-width modulated duty cycle, a voltage and an electric current, applied to a solenoid valve (OCV) of a variable cam control (VCT) device, and using an associated relationship stored in non-volatile memory (110) that controls the camshaft solenoid duty cycle and relates the camshaft angular velocity of the device to the combustion engine oil temperature (EOT), wherein the adjustment is made in response to degradation of a sensor used to measure the combustion engine oil temperature (EOT) directly or indirectly, and damage to the non-volatile memory (110), wherein the non-volatile memory (110) includes a keep-alive memory (KAM) of a combustion engine control unit (12), wherein the sensor includes one or more of an combustion engine oil temperature sensor (EOT) coupled to an oil pan, a combustion engine coolant temperature sensor (ECT), an air charge temperature sensor (ACT), and a mass airflow sensor (MAF).

Hybrid group for rotationally driving fans (1) of vehicle engines, comprising an electromechanical coupling (40) for taking up the movement from the crankshaft of the vehicle and an electric motor (10) which can be powered independently of the combustion engine, respectively connected to the driven shaft (2) which drives the fan (1), the group being characterized in that the electric motor (10) is arranged upstream of the electromechanical coupling (40) in the axial direction (X-X) and is integral with a bell member (5) fastened to the base (3) of the combustion engine.

1. The name of the design product: speed regulating water pump. 2. The use of the design product: speed regulating water pump for cooling system of internal combustion engine of automobile and ship. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: design 1 perspective view. 5. Design 1 is specified as the basic design.

When a stop request for the internal combustion engine is detected, a control device for the internal combustion engine calculates a target rotational speed such that the target rotational speed increases as the engine coolant temperature decreases. Next, in a state in which the throttle valve is fully opened, the fuel injection is continued and idling is performed until the engine rotation speed reaches the target rotation speed. Furthermore, when the engine rotation speed reaches the target rotation speed, the control device stops the fuel injection in a state in which the throttle valve is fully opened. According to the present invention, an output shaft of an internal combustion engine is rotated due to inertia to scavenge the inside of a cylinder of the internal combustion engine, so that moisture generated on the inner wall of the cylinder can be blown away, and the occurrence of misfire can be suppressed.

Method for diagnosing the coolant injection of an internal combustion engine, characterized in that smoothness or roughness of running is determined from the fluctuations in the speed of several combustion processes, wherein the roughness of running indicates how much the individual combustion processes differ from each other and the smoothness of running indicates how much the individual combustion processes are similar, and from the smoothness of running or roughness of running a functioning or non-functioning of the coolant injection is determined.

Cooling device (30) for a turbocharged internal combustion engine (10), wherein the turbocharged internal combustion engine (10) comprises: a cylinder head (18) with an exhaust port (18C); a turbocharger (12) comprising a compressor (12a) arranged in an inlet channel (22) and a turbine (12b) arranged on a downstream side of the outlet opening (18C) in an outlet channel (24) which includes a channel in the outlet opening (18C); and a charge air cooler (26) which is arranged on a downstream side of the compressor (12a) in the inlet channel (22), the cooling device (30) comprises: a high-temperature side cooling circuit (32) comprising a high-temperature side pump (36) configured to circulate a high-temperature coolant, and an HT cooler (38) acting as a high-temperature side cooling section, configured to cool the high-temperature coolant, wherein the high-temperature side cooling circuit (32) is configured to supply the high-temperature coolant to the cylinder head (18); a low-temperature side cooling circuit (34) comprising a low-temperature side pump (62) configured to circulate a low-temperature coolant, and an LT cooler (64) acting as a low-temperature side cooling section, configured to cool the low-temperature coolant, wherein the low-temperature side cooling circuit (34) is configured to supply the low-temperature coolant to the charge air cooler (26); and an electronic control unit (70), where the high-temperature cooling section and the low-temperature cooling section are at least partially used together, comprising the high-temperature cooling circuit (32), a first coolant channel (54) in which the high-temperature coolant flows around the outlet opening (18C), a second coolant channel (56) in which the high-temperature coolant flows through the cylinder head (18) without flowing around the exhaust port (18C), and a flow rate control valve (58) configured to control the flow rate of the high-temperature coolant flowing through the first coolant channel (54), and wherein the electronic control unit (70) is configured to perform a response improvement process for controlling the flow rate control valve (58) in at least part of an acceleration period from the start of acceleration of a vehicle containing the turbocharged internal combustion engine (10) to the end of acceleration, in order to reduce the flow rate of the high-temperature coolant flowing through the first coolant channel (54), characterized by the fact that the electronic control unit (70) is configured to control the low-temperature side pump (62) to increase the flow rate of the low-temperature coolant circulating through the low-temperature side cooling circuit (34), wherein the electronic control unit (70) is configured to control the flow rate control valve (58) during the response improvement process to stop the flow of high-temperature coolant through the first coolant channel (54), and wherein the electronic control unit (70) is configured to control the low-temperature side pump (62) during the response improvement process by increasing the flow rate of the low-temperature coolant in order to increase the cooling capacity of the low-temperature side cooling circuit (34) by an amount corresponding to a decrease in the cooling capacity of the high-temperature side cooling circuit (32) in response to a decrease in the amount of heat absorbed by the high-temperature coolant from the exhaust gas via the outlet opening (18C).

A cooling water temperature control method for a hybrid vehicle equipped with an internal combustion engine comprises: calculating the required workload for traveling from the position of the hybrid vehicle to the highest elevation point within a predetermined distance range; executing first control for cooling the cooling water so that the temperature of the cooling water of the internal combustion engine reaches a first target temperature when the value obtained by subtracting a possible workload of the internal combustion engine from the required workload does not exceed a threshold; and executing second control for cooling the cooling water so that the temperature of the cooling water reaches a second target temperature lower than the first target temperature with cooling capacity higher than that of the first control even if the temperature of the cooling water is lower than the first target temperature when the value obtained by subtracting the possible workload of the internal combustion engine from the required workload exceeds the threshold.

The following description relates to a system for cooling an internal combustion engine (12) in a motor vehicle, comprising: a fluid tank (14) for storing and supplying a coolant (16); an injection device (18) connected to the fluid tank (14) for indirectly or directly injecting the coolant (16) into the internal combustion engine (12); a first sensor unit (20) for measuring the fill quantity of the coolant (16) within the fluid tank (14) and for providing measurement data; a control unit (22) connected to the first sensor unit (20) and the injection device (18) for storing and providing the measurement data received from the first sensor unit (20) and for controlling the injection quantity of the coolant (16) as a function of at least one operating parameter of the internal combustion engine (12);wherein the control unit (22) stores measurement data implying a filling of the fluid tank (14) with a timestamp in a first storage unit (24).

Method for controlling the cooling of a piston of at least one cylinder (250) of an internal combustion engine, comprising the steps: - Providing a pressurized cooling medium at a crankcase side of the cylinder (250) via a first valve arrangement (240) comprising a cooling medium inlet and a cooling medium outlet and a spring-loaded piston arrangement (241, 242) for a flow connection between the coolant inlet and the coolant outlet at a predetermined coolant pressure at the inlet, and - Providing the cooling medium at a second valve arrangement (220) for providing cooling medium to the spring-loaded piston arrangement (241, 242) for controlling the predetermined cooling medium pressure, characterized by the step: - Providing, in the spring-loaded piston arrangement (241, 242), an additional spring-loaded piston (243) to provide a specific coolant flow rate from the inlet to the outlet at a coolant pressure at the inlet below the predetermined coolant pressure.

Coolant fluid leakage detection method for a cooling system of an internal combustion engine (5) of a motor vehicle comprising measuring (10, 20) the temperature at two different instants (Tti,Tti+1) and comparing (30) measurements taken. If the difference is smaller than a first threshold value (X1) restart measuring stages and if it is equal or bigger then measuring (40) the knocking level (K) of the internal combustion engine. If knocking level (K) is lower than a second threshold value (X2), then set a counter (Ct) to zero and restart measuring stages. Conversely if knocking level (K) is equal or bigger, then add one unit to the counter. If the resulting counter value is lower than a third threshold value (X3), then restart measuring stages and if the counter value is equal to the third threshold value (X3), then send (60) a leakage alert.

To positively cool an exhaust manifold arranged on the rear side of an engine in the longitudinal direction of a vehicle by an air flow.SOLUTION: In the cooling control device of the internal combustion engine for the vehicle, the internal combustion engine 1 includes an exhaust manifold 2 on the rear side, and the internal combustion engine 1 is cooled by an air flow introduced from the front side. A cooling-heat-exchanger 8b for circulating the refrigerant whose temperature is lowered is arranged above the exhaust manifold 2, a valve 8b for selectively circulating the refrigerant to the cooling-heat-exchanger 7b is provided, and a controller 10 for controlling opening and closing of the valve 7b includes a determination unit for determining whether or not the exhaust gas temperature of the internal-combustion engine 1 is equal to or higher than a predetermined determination reference temperature, and a cooling-instruction unit for operating the valve to circulate the refrigerant to the cooling-heat exchanger when the determination unit determines that the exhaust gas temperature of the internal-combustion engine is equal to or higher than the determination reference temperature.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of internal combustion engine cooling, and particularly relates to a cooling system and method for ensuring full-load operation of an internal combustion engine in a high-temperature environment, which comprises a high-temperature cooling circulation system, a low-temperature cooling circulation system, an air cooling radiator, a high-temperature electric valve, a low-temperature electric valve and a cooling tower circulation system, the high-temperature cooling circulation system, the high-temperature side of the air cooling radiator and the high-temperature electric valve form a heat exchange loop, the low-temperature cooling circulation system, the low-temperature side of the air cooling radiator and the low-temperature electric valve form a heat exchange loop, and the cooling tower circulation system comprises a cooling tower, a high-temperature plate heat exchanger and a low-temperature plate heat exchanger which form the heat exchange loop. The cooling tower circulating system has the beneficial effects that efficient cooling is achieved by introducing the cooling tower circulating system, and it is guaranteed that the internal combustion engine can run in a full-load mode in a high-temperature environment.

The objective is to provide a cooling device for an internal combustion engine that can suppress the freezing of the throttle valve. [Solution] A cooling system for an internal combustion engine comprising: a first cooling water passage connected to an internal combustion engine; a second cooling water passage connected to a throttle valve; a third cooling water passage connected to the first cooling water passage; a first pump; a second pump provided upstream of the first pump and upstream of the position in the first cooling water passage to which the third cooling water passage is connected; and a control unit that controls the first pump and the second pump, wherein the control unit switches between a first control using the first pump to circulate cooling water in the order of the first cooling water passage, the internal combustion engine, the second cooling water passage, the throttle valve, and the third cooling water passage, and a second control using the second pump to circulate cooling water in the order of the first cooling water passage, the third cooling water passage, and the throttle valve.

The invention discloses a coupling hydrogen afterburning organic liquid hydrogen storage combined hydrogen engine power system and a working method thereof, and belongs to the technical field of new energy automobile power systems. The system comprises an organic liquid hydrogen storage (LOHC) preheating subsystem, an LOHC dehydrogenation subsystem, a hydrogen separation and purification subsystem, a hydrogen internal combustion engine subsystem, a catalytic combustion energy supplementing subsystem, a cooling liquid subsystem and an electric heating and electric auxiliary heating starting subsystem. According to the system, waste heat of cooling liquid of the hydrogen internal combustion engine, dehydrogenated mixed gas and energy-supplied tail gas is recycled in sequence through a multi-stage heat exchange network and used for preheating LOHC; and part of hydrogen is used for performing catalytic combustion energy supplement on engine tail gas, and high-temperature tail gas is used as a main heat source for dehydrogenation reaction, so that the contradiction between low temperature of high-efficiency engine tail gas and high heat required by dehydrogenation is solved. The system is integrated with a central control unit and can intelligently coordinate all subsystems according to working conditions. The energy comprehensive utilization efficiency is remarkably improved, and the cold start capacity of the system is ensured.

The invention discloses a core parameter design method applied to a heat dissipation cooling system of an industrial internal combustion engine. Comprising the steps of calculating the heat dissipating capacity of a cooling system, calculating the circulating liquid flow of the cooling system, calculating the demand quantity of cooling air, calculating the windward area of a radiator, calculating the average temperature difference of cooling liquid and cooling air in the radiator, calculating the heat exchange coefficient of the radiator, calculating the heat dissipating surface area of the radiator and calculating the core thickness of the radiator. And calculating the performance of the water pump assembly and the performance of the cooling fan. The method is a general calculation theory in an internal combustion engine cooling system and has high engineering adaptability.

Cooling system of a vehicle, comprising: a first refrigerant line (10) configured to circulate a refrigerant between an internal combustion engine (11) and a first radiator (12), and comprising a main line (13) which is a closed circuit to connect the internal combustion engine (11) to the first radiator (12); a second refrigerant line (20) configured to circulate the refrigerant between a thermoelectric module (21) and a second radiator (22) to generate electricity from heat in an exhaust gas released by the combustion engine (11), and configured to circulate the refrigerant passing through the thermoelectric module (21) to a heating element (15) in a cold start mode; a supply line (30) configured to connect an inlet side of the combustion engine (11) in the first refrigerant line (10) and an inlet side of the thermoelectric module (21) in the second refrigerant line (20) to supply the refrigerant in the first refrigerant line (10) to the second refrigerant line (20); and a return line (40) configured to connect an outflow side of the thermoelectric module (21) in the second refrigerant line (20) and an outflow side of the combustion engine (11) in the first refrigerant line (10) to return the refrigerant in the second refrigerant line (20) to the first refrigerant line (10), the cooling system further comprising: a first pump (16) which is provided on an inflow side of a connection point of the main line (13) and the supply line (30), and a second pump (23) which is provided on an inflow side of a connection point of the second refrigerant line (20) and the supply line (30), wherein in the cold start mode, in which the temperature of the refrigerant passing through the combustion engine (11) is less than a first reference temperature (T1), the first pump (16) supplies some refrigerant to the thermoelectric module (21) through the supply line (30) and the second pump (23) is not operated when the temperature of the refrigerant passing through the combustion engine (11) is less than the first reference temperature (T1).

The invention relates to an internal combustion engine (1) with at least one liquid-cooled cylinder head (2) and cylinder block (3), wherein: - the at least one cylinder head (2) is equipped with at least one integrated coolant jacket (2a), - the cylinder block (3) is equipped with at least one integrated coolant jacket (3a), wherein this block-associated coolant jacket (3a) has a second supply opening (4b) on the inlet side for supplying coolant and a second discharge opening (5b) on the outlet side for discharging the coolant, and - to form a coolant circuit, the discharge openings (5a, 5b) are at least connectable to the supply openings (4a, 4b), wherein: - the second discharge opening (5b) is at least connectable to the second supply opening (4b) via a return line (7) in which a heat exchanger (7a) is arranged, - the second discharge opening (5b) is at least connectable to the second supply opening (4b) via a bypass line (8). connectable,- the first discharge opening (5a) via heating circuit line (6), in which a coolant-operated vehicle interior heater (6a) is arranged, is at least connectable to the first supply opening (4a), - upstream of the supply openings (4a, 4b) a common pump (12) is provided for conveying coolant to the two supply openings (4a, 4b), wherein the pump (12) comprises a housing and a shut-off element (9) is provided between the pump (12) and the second supply opening (4b), and - the heating circuit line (6) opens into the bypass line (8), wherein no shut-off element is provided between the first discharge opening (5a) and the bypass line (8).

Hybrid vehicle cooling system, with: an internal combustion engine (206); a cooler (209); an electric machine; Power electronic components that can be operated to supply energy to the electric machine; a coolant circuit (220) which is in heat exchange with the internal combustion engine (206), the radiator (209), the electric machine and the power electronics components; wherein the electric machine and the power electronics components are arranged in parallel to each other in the coolant circuit (220) in order to selectively receive coolant from the radiator (209), and wherein the internal combustion engine (206) and the radiator (209) are arranged in series in the coolant circuit (220) and in series with each of the electric machine and the power electronics components, and further comprising an internal combustion engine bypass (226) which is configured to direct the coolant flow around the internal combustion engine (206), and a valve which is operable to selectively direct coolant through the internal combustion engine (206) or through the internal combustion engine bypass (226); a mechanically driven coolant pump (204) to pump coolant through the internal combustion engine (206), wherein the internal combustion engine bypass (226) is further configured to bypass the mechanically driven coolant pump (204), and an electrically driven coolant pump (202) which is operable to circulate coolant through the coolant circuit (220) through the internal combustion engine bypass (226) and through the mechanically driven coolant pump (204) and the internal combustion engine (206), wherein each of the mechanically driven coolant pump (204) and the electrically driven coolant pump (202) is arranged in series with each other and in series with each of the electric machine and the power electronics components in the coolant circuit (220) to provide a coolant flow through the internal combustion engine (206) to the radiator (209) and from the radiator (209) to the electric machine and the power electronics components; and a control unit that can be operated to control the electric machine and the power electronics components in order to supply energy to the electric machine, wherein the control unit is operable to selectively increase the temperature of the internal combustion engine (206) by controlling the electric machine and / or the power electronics components to supply more heat to the coolant which is in heat exchange with the internal combustion engine (206) and by circulating the coolant to the internal combustion engine (206) through at least one of the mechanically driven coolant pumps (204) and the electrically driven coolant pump (202).