JP6065430B2 - Vehicle engine warm-up acceleration device - Google Patents

Description

  The present invention relates to a vehicle engine warm-up promoting device.

  In a vehicle engine, cooling and lubrication are performed with cooling water or oil. Until the warm-up operation of the vehicle engine is completed, the heater in the cabin does not work due to the low temperature of the coolant, the fuel consumption deteriorates due to the increased friction due to the low temperature of the oil, and the exhaust gas purification device because of the low temperature of the exhaust gas Things that don't work can happen. Therefore, in order to promote warm-up of the vehicle engine, warm-up devices such as a glow plug, an intake heater, a block heater, and an oil heater are attached to the vehicle engine.

  For example, an engine such as a fire engine may be equipped with a block heater that warms cooling water using an external power source or an oil heater that warms oil in preparation for emergency dispatch. In addition, diesel engines with cold district specifications and low compression ratio specifications are equipped with glow plugs and intake heaters that warm the intake air of the engine in order to shorten the warm-up time and suppress the emission of white smoke emitted during warm-up operation. May be.

  A warm-up promoting device for a vehicle engine is described in Patent Document 1, for example.

JP 2009-23599 A

  By using a warm-up device such as a glow plug, an intake heater, a block heater, and an oil heater, power is generated by an alternator (AC generator; ACG) and the electric power stored in the battery is consumed. For this reason, when the warm-up device is used, the power generation amount of the alternator increases, so that the engine load increases and the fuel consumption can deteriorate.

  Therefore, an object of the present invention is to suppress deterioration in fuel consumption when using a warm-up device.

The present invention is a vehicle engine warm-up promoting device for promoting warm-up of a vehicle engine, wherein the generator is driven by the vehicle engine, and is directly connected to the generator. A warming-up device that warms intake air, cooling water, or oil of the vehicle engine supplied with electric power generated by the vehicle, and a motoring state detection unit that detects a motoring state of the vehicle engine where the fuel injection amount becomes zero Driving means for generating power by the generator and operating the warm-up device when the motoring state of the vehicle engine is detected by the motoring state detection means, and driven by the vehicle engine. comprising vehicle speed detecting means for detecting a vehicle speed of the vehicle that, the said control means, the vehicle engine by the motoring state detecting means When the motoring state is detected, only when the vehicle speed detected by the vehicle speed detection means is greater than a predetermined vehicle speed at which the engine braking force does not become excessive, the generator generates power and the warm-up device A vehicle engine warm-up promoting device is provided .

  The warm-up promoting device further includes a vehicle driven by the vehicle engine and an operation state detection unit that detects an operation state of the vehicle engine, and the control unit is detected by the operation state detection unit. It may be determined whether or not the warm-up device needs to be operated based on the operating state of the vehicle and the vehicle engine.

  The warm-up device may include a block heater that warms cooling water circulating in the vehicle engine, or an oil heater that warms oil circulating in the vehicle engine.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an outstanding effect that the deterioration of the fuel consumption at the time of use of a warm-up device can be suppressed.

It is a schematic structure figure showing the warming-up promotion device of the engine for vehicles concerning one embodiment of the present invention. It is a figure which shows an example of the control flow of the warming-up device by ECU. It is a figure which shows an example of the control flow of the warming-up device in ECU warming-up promotion mode and normal operation mode.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a warm-up promoting device for a vehicle engine according to an embodiment of the present invention.

  In the vehicle engine (in this embodiment, a diesel engine) 1 shown in FIG. 1, an intake passage 3 is connected to an intake manifold 2 of the vehicle engine 1, and an exhaust manifold 4 of the vehicle engine 1 is exhausted. A passage 5 is connected. In the intake passage 3, a compressor 6 a of the turbocharger (supercharger) 6, an intercooler 7, an intake throttle valve 8, and an intake heater 27 described later are arranged in this order from the intake upstream side. On the other hand, a turbine 6b of a turbocharger 6 and a catalyst-carrying diesel particulate filter (C-DPF) 9 are disposed in the exhaust passage 5 in order from the exhaust upstream side.

  Further, the intake passage 3 between the intake throttle valve 8 and the intake heater 27 and the exhaust passage 5 on the exhaust upstream side of the turbine 6b are connected by an EGR passage (high pressure EGR passage) 10. In the EGR passage 10, an EGR cooler 11 and an EGR valve 12 are disposed in order from the EGR gas upstream side (exhaust passage 5 side).

  Various sensors such as an engine rotation sensor 13, an accelerator opening sensor 14, an outside air temperature sensor 15, a cooling water temperature sensor 16, an atmospheric pressure sensor 17 and a vehicle speed sensor 18 are provided on the vehicle engine 1 or a vehicle driven by the vehicle engine 1. It is installed. In order to control the fuel injection device (not shown) of the vehicle engine 1, the intake throttle valve 8, the EGR valve 12, and the like, an electronic control unit (hereinafter referred to as ECU) 19 as a control means includes various sensors described above. The output signal from the class is input.

  The warm-up promoting device 20 according to the present embodiment includes a generator 21, a warm-up device 22, and a motoring state detection unit that detects a motoring state of the vehicle engine 1 (a state in which the fuel injection amount is zero). The vehicle speed detecting means for detecting the vehicle speed of the vehicle driven by the vehicle engine 1 and the driving state detecting means for detecting the driving state of the vehicle driven by the vehicle engine 1 and the vehicle engine 1 are provided. The accelerator opening sensor 14 constitutes the motoring state detection means, and the vehicle speed sensor 18 constitutes the vehicle speed detection means. Further, the engine rotation sensor 13, the accelerator opening sensor 14, the outside air temperature sensor 15, the cooling water temperature sensor 16, the atmospheric pressure sensor 17, and the vehicle speed sensor 18 constitute the above-described driving state detection means.

  In the warm-up promotion device 20 according to the present embodiment, a generator 21 is mounted on the vehicle engine 1 and the ECU 19 can control the load, switching between operation and non-operation of the generator 21. . The generator 21 is connected to the crankshaft of the vehicle engine 1 via pulleys 23 and 24 and a belt 25 and is driven by the vehicle engine 1. The generator 21 is composed of, for example, an alternator (alternator: ACG). Although not shown, the generator 21 is connected to a warm-up device 22 (a glow plug 26, an intake heater 27, a block heater 28, and an oil heater 29), and the electric power generated by the generator 21 is supplied to each warm-up device 22. It comes to be supplied. It is also possible to dispose a clutch between the generator 21 and the vehicle engine 1 and switch between the operation and non-operation of the generator 21 by the connection / disconnection control of the clutch.

  In the warm-up promoting device 20 according to the present embodiment, a warm-up device 22 (a glow plug 26, an intake heater 27, a block heater 28, An oil heater 29) is mounted, and the ECU 19 can be switched on / off of each warm-up device 22. Although not shown, each warm-up device 22 is directly connected to the generator 21 without going through the battery, and the electric power generated by the generator 21 is supplied to each warm-up device 22.

  The glow plug 26 is disposed in a cylinder (cylinder) of the vehicle engine 1 and warms the intake air in the cylinder of the vehicle engine 1. The intake heater 27 is disposed in the intake passage 3 of the vehicle engine 1 and warms the intake air in the intake passage 3 of the vehicle engine 1. The block heater (engine block heater) 28 is disposed in the cylinder head or cylinder block of the vehicle engine 1, and warms the cooling water (engine cooling water) in the cylinder head or cylinder block of the vehicle engine 1. The oil heater (oil pan heater) 29 is disposed in the oil pan of the vehicle engine 1 and warms oil (engine oil) in the oil pan of the vehicle engine 1.

  Next, the operation of the warm-up promoting device 20 according to this embodiment will be described.

  FIG. 2 shows an example of a control flow of the warm-up device 22 by the ECU 19.

  When the vehicle engine 1 is started, the engine stop state M0 is shifted to the start mode M1. In the start mode M1, the ECU 19 activates the warm-up device 22 that is operated in the start mode M1 based on the detected values (outside air temperature, cooling water temperature, air pressure, etc.) of the outside air temperature sensor 15, the cooling water temperature sensor 16, the atmospheric pressure sensor 17, and the like. In addition to the selection, the operating time of the warm-up device 22 (may be determined for each warm-up device 22) is set. Next, the ECU 19 generates power by the generator 21 and supplies electric power to the warm-up device 22, and turns on the warm-up device 22 that is operated in the start mode M1.

  After the set operation time has elapsed, the start mode M1 is shifted to the warm-up promotion mode M2 or the normal operation mode M3. That is, the ECU 19 turns off the warm-up device 22 that was operating in the start mode M1. Even before the set operating time has elapsed, when the vehicle starts, the start mode M1 may be shifted to the warm-up promotion mode M2 or the normal operation mode M3.

  The ECU 19 determines the warm-up state of the vehicle engine 1 based on the detected values (outside air temperature, cooling water temperature, air pressure, etc.) of the outside air temperature sensor 15, the cooling water temperature sensor 16, and the atmospheric pressure sensor 17 (warm-up state determination). ). When the ECU 19 determines in the warm-up state determination that the warm-up device 22 needs to be operated, the ECU 19 performs an operation state determination described later. On the other hand, when the ECU 19 determines that it is not necessary to operate the warm-up device 22 in the warm-up state determination, the ECU 19 shifts from the warm-up promotion mode M2 to the normal operation mode M3 or maintains the normal operation mode M3. That is, the ECU 19 turns off the warm-up device 22 that has been operated in the warm-up promotion mode M2, or maintains the state where the warm-up device 22 is off.

  Further, the ECU 19 determines the operating states of the vehicle and the vehicle engine 1 based on the detected value (vehicle speed) of the vehicle speed sensor 18 and the fuel injection amount calculated from the detected value (accelerator opening) of the accelerator opening sensor 14. Determine (running state determination). When the ECU 19 determines that the vehicle speed of the vehicle is equal to or higher than the predetermined vehicle speed or determines that the vehicle engine 1 is not in the motoring state in the driving state determination, the ECU 19 shifts from the warm-up promotion mode M2 to the normal operation mode M3 or The operation mode M3 is maintained. That is, the ECU 19 turns off the warm-up device 22 that has been operated in the warm-up promotion mode M2, or maintains the state where the warm-up device 22 is off.

  On the other hand, when the ECU 19 determines that the vehicle speed of the vehicle is greater than the predetermined vehicle speed and determines that the vehicle engine 1 is in the motoring state in the driving state determination, the ECU 19 changes from the normal operation mode M3 to the warm-up promotion mode M2. The transition or warm-up promotion mode M2 is maintained. That is, the ECU 19 generates power by the generator 21 and supplies power to the warm-up device 22, and turns on the warm-up device 22 that is operated in the warm-up promotion mode M2 or the warm-up device 22 is ON. maintain. Only when the vehicle speed is higher than the predetermined vehicle speed, the transition from the normal operation mode M3 to the warm-up promotion mode M2 or the maintenance of the warm-up promotion mode M2 is caused by the use of the generator 21 in accordance with the use of the warm-up device 22. This is to prevent the engine braking force from becoming excessive due to the increase in the amount.

  FIG. 3 shows an example of a control flow of the warm-up device 22 in the warm-up promotion mode M2 and the normal operation mode M3 by the ECU 19.

  In step S1, the ECU 19 determines whether or not the detected value T (outside temperature) of the outside temperature sensor 15 is lower than a predetermined outside temperature T0 (for example, 30 ° C. to 40 ° C.). In step S2, the ECU 19 determines whether or not the detected value Tw (cooling water temperature) of the cooling water temperature sensor 16 is lower than a predetermined cooling water temperature Tw0 (for example, 80 ° C. to 90 ° C.).

  When the ECU 19 determines in step S1 that the detected value T of the outside air temperature sensor 15 is equal to or higher than the predetermined outside air temperature T0, the ECU 19 proceeds to step S7 and turns off the warm-up device 22 that has been operated in the warm-up promotion mode M2 or warms up. The device 22 remains off. Further, when the ECU 19 determines in step S2 that the detected value Tw of the cooling water temperature sensor 16 is equal to or higher than the predetermined cooling water temperature Tw0, the ECU 19 proceeds to step S7 and turns off the warm-up device 22 that has been operated in the warm-up promotion mode M2. Or the warm-up device 22 is maintained in the OFF state.

  Next, in step S3, the ECU 19 determines whether or not the detected value Vs (vehicle speed) of the vehicle speed sensor 18 is greater than a predetermined vehicle speed Vs0 (for example, 5 km / h). In step S4, the ECU 19 determines whether the fuel injection amount Ef calculated from the detected value (accelerator opening) of the accelerator opening sensor 14 is zero (Ef = 0).

  When the ECU 19 determines in step S3 that the detected value Vs of the vehicle speed sensor 18 is equal to or lower than the predetermined vehicle speed Vs0, the ECU 19 proceeds to step S7 and turns off the warm-up device 22 that has been operated in the warm-up promotion mode M2 or warms-up device 22. Is maintained in the OFF state. Further, when the ECU 19 determines that the fuel injection amount Ef calculated from the detected value of the accelerator opening sensor 14 is not zero in step S4, the ECU 19 proceeds to step S7, and the warm-up that has been operated in the warm-up promotion mode M2 is performed. The machine device 22 is turned off or the warm-up device 22 is kept off.

  Then, in step S5, the ECU 19 performs the warm-up operation in the warm-up promotion mode M2 based on the detected values (outside air temperature, cooling water temperature, air pressure, etc.) of the outside air temperature sensor 15, the cooling water temperature sensor 16, and the atmospheric pressure sensor 17. Device 22 is selected. Next, in step S6, the ECU 19 generates power by the generator 21, supplies power to the warm-up device 22, and turns on the warm-up device 22 to be operated in the warm-up promotion mode M2 or turns on the warm-up device 22 Maintain the state.

  Next, the function and effect of the warm-up promoting device 20 according to this embodiment will be described.

  In the present embodiment, when the vehicle engine 1 is in a motoring state, the generator 21 generates power and supplies electric power to the warm-up device 22, and the warm-up device 22 (glow plug 26, intake heater 27, The warming-up of the vehicle engine 1 is promoted by operating the block heater 28 and the oil heater 29). By operating the warm-up device 22, warm-up of the vehicle engine 1 is promoted to improve fuel consumption, exhaust gas, and cabin heater performance. Further, when the vehicle engine 1 is in a motoring state, power is generated by the generator 21 using the kinetic energy of the vehicle running in coasting, and the electric power generated by the generator 21 is used for warming. Since the machine device 22 is operated, the fuel consumption is not deteriorated.

  In this embodiment, each warm-up device 22 (glow plug 26, intake heater 27, block heater 28, and oil heater 29) is directly connected to the generator 21 without going through the battery. This configuration is characterized in that it is not necessary to temporarily store the power generated by the generator 21 in the battery, so that the configuration is simple and there is no energy loss due to power storage. However, as in a so-called hybrid electric vehicle (HEV), the power generated by the generator 21 can be temporarily stored in the battery, and the warm-up device 22 can be operated by the power stored in the battery. In that case, it is not necessary to always operate the generator 21 when the vehicular engine 1 is in the motoring state, and the ECU 19 controls the generator 21 according to the state of charge (SOC) of the generator 21. You may make it switch an action | operation and a non-operation.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various other embodiments can be adopted.

  For example, the present invention may be applied to a heater for warming up oil at a location (for example, transmission, differential gear, etc.) where power supply is required in a vehicle. At that time, by monitoring the temperature of each part, it is possible to efficiently warm up by controlling which part is heated and its output is controlled by the ECU.

  Moreover, although it becomes a control flow different from what was shown in FIG.2 and FIG.3, it is possible to raise an engine load by raising an engine load with a generator at the time of deceleration of a vehicle. The electric power generated by the generator at that time can be used for the operation of warm-up devices such as a glow plug, an intake heater, a block heater and an oil heater.

  The vehicle engine 1 is not limited to a diesel engine, and may be a gasoline engine, for example.

  Furthermore, the warm-up device 22 is not limited to the glow plug 26, the intake heater 27, the block heater 28, the oil heater 29, and the like, and may be provided at other locations in the vehicle engine 1. .

DESCRIPTION OF SYMBOLS 1 Vehicle engine 13 Engine rotation sensor (driving condition detection means)
14 Accelerator opening sensor (motoring state detection means, driving state detection means)
15 Outside air temperature sensor (operating state detection means)
16 Cooling water temperature sensor (operating state detection means)
17 Barometric pressure sensor (operating state detection means)
18 Vehicle speed sensor (vehicle speed detection means, driving state detection means)
19 ECU (control means)
20 Warm-up Promotion Device 21 Generator 22 Warm-up Device 26 Glow Plug 27 Intake Heater 28 Block Heater 29 Oil Heater

Claims (3)

A vehicle engine warm-up promoting device for promoting warm-up of a vehicle engine,
A generator driven by the vehicle engine;
A warm-up device that is directly connected to the generator and is supplied with electric power generated by the generator to warm intake air, cooling water, or oil of the vehicle engine;
Motoring state detecting means for detecting a motoring state of the vehicle engine in which the fuel injection amount becomes zero;
Control means for generating power by the generator and operating the warm-up device when the motoring state detection means detects the motoring state of the vehicle engine;
Vehicle speed detection means for detecting the vehicle speed of the vehicle driven by the vehicle engine;
Equipped with a,
When the motoring state detection unit detects the motoring state of the vehicle engine, the control unit detects a vehicle speed of the vehicle detected by the vehicle speed detection unit at a predetermined vehicle speed at which an engine braking force is not excessive. A warm-up promoting device for a vehicle engine characterized by generating power by the generator and operating the warm-up device only when larger . A vehicle driven by the vehicle engine, and driving state detecting means for detecting a driving state of the vehicle engine;
It said control means, based on operating conditions of the vehicle and the vehicle engine is detected by said operating condition detecting means, according to claim 1 to determine whether the it is necessary to operate the warm-up device Vehicle engine warm-up promotion device. The warming-up device, block heater to warm the cooling water circulating within the vehicle engine, or a vehicle engine according to claim 1 or 2 comprising an oil heater to warm the oil circulating through the vehicle in an engine Warm-up promotion device.