Supercharging pressure controller for engine with supercharger

[Detailed Description of the Invention]

(Field of the Invention) . This invention relates to the supercharged control device of the engine with a supercharger which supercharges an air intake with an exhaust steam turbine supercharging device or a mechanical supercharger. (Conventional technology) When an intake-air temperature rises by the exhaust gas temperature of high temperature , being transmitted to an air intake system when constituted, for example from an exhaust steam turbine supercharging device and an above-mentioned supercharger is constituted from a mechanical supercharger, an intake-air temperature rises by air being compressed. If an intake-air temperature makes it above upper 4, by air expanding, Sufficient 1 efficiency of an inhalation air content will fall, and also it will produce problems, such as carrying out abnormal combustion, because an intake-air temperature is high. Conventionally, when the intake-air temperature of the supercharger upper stream was beyond a predetermined value, there was the method (real Capture No. 56413 [ 53 to ] gazette) of increasing charge pressure and raising the restoration efficiency of an inhalation air content, but when it was this method, it was not solved about the point of abnormal combustion. the method of cooling an air intake, for example except for a cold machine, while interposing a cooling device like an intercooler in the intake passage of the lower stream of a supercharger, for example and supervising open air concentration as decline in the above-mentioned restoration efficiency, and a measure against the prevention from abnormal combustion - it was. Although the above-mentioned problem is solved by the rise of an intake-air temperature being prevented in the case of this method, However, since a chilling effect changes with the run states of vehicles in the case of an above-mentioned intercooler, even if it is difficult to control an intake-air temperature only by the surveillance of outdoor air temperature in a preset value and outside temperature is constant, an intake-air temperature may become low too much below at a preset value. That is, when vehicles run the air cooling of an intercooler, and water-cooling at high speed, a wind is hitting a heat exchanger well, It is a chilling effect's going up, therefore an intake-air temperature's becoming low too much in the time of high speed operation, and air's contracting, and supercharged by this contracted state, an inhalation air content will be supercharged beyond a preset value, and engine Thirsty goes up as a result of a king -- fatigue of an engine -- a large -- the endurance will fall that it is A scintillation and a serious damage will be given to an engine. When an engine is a rotary, microatomization of a fuel system gets worse, and since the oil which has protected the housing side is passed with fuel, it has the problem of compression falling out or causing baking. When detecting the run state of above-mentioned vehicles, for example by the operational status of a speedometer or an engine, controlling the cooling state of a cooling device or controlling charge pressure according to the run state, it has the problem that control of a signal and the composition of a control circuit become very complicated. (The object of an invention) The object of this invention originates in the supercharged intake-air temperature being low, and it is to lose the damage done to an engine in offer of the charge pressure control device of the engine with a supercharger which becomes possible with easy composition. (Constitution of an invention) When the intake temperature sensor which this invention interposed the intake air cooling device in the intake passage of the lower stream of a supercharger, and was formed in the intake passage of the lower stream of this intake air cooling device shows below the predetermined value of an intake-air temperature, a charge pressure adjustment device is a supercharged control device of an engine with predetermined value lowering Supercharger about charge pressure. (EFFECT OF THE INVENTION) In the present invention, if an intake-air temperature of the intake air cooling device lower stream is detected and this intake-air temperature falls below in a predetermined value with an intake air cooling device, air intake pressure will be dropped to a predetermined value by an air intake pressure adjustment device. Therefore, when an intake-air temperature is low, charge pressure is dropped, by high power of an engine by high restoration efficiency being prevented by this, unusual heating of an engine can be prevented and a damage done to an engine can be eliminated. and the intake-air temperature of the lower stream of an intake air cooling device -- surveillance Topple -- by things, positive air intake pressure control can carry out easily. (EXAMPLE) One example of this invention is explained in full detail based on a drawing below. Engine 1 is [ in / a drawing shows the charge pressure control device of an engine with a supercharger, and / Drawing 1 ], In the upstream end of intake passage 6 which has piston 2, cylinder head 3, inhalation valve 4, and exhaust valve 5, and is connected to the air intake boat of inhalation valve 4, Air flow meter 8 is formed in air cleaner 7 and its lower stream, and compressor (compressor impeller) 10 of exhaust steam turbine supercharging device 9 is formed in the lower stream. In intake passage 6 of the lower stream of above-mentioned compressor 1O, Intercooler 11 of air cooling or water-cooling is interposed, and this intercooler 11 cools an air intake, and it is in intake passage 6 of the lower stream of this intercooler 11, Intake temperature sensor 12 which detects an intake-air temperature is formed, and the intake-air temperature signal of this intake temperature sensor 12 is inputted into computer 15 mentioned below. In intake passage 6 of the lower stream of intake temperature sensor 12, Throttle valve 13 and fuel injection valve 14 are provided, and fuel injection valve 14 is, The signal which shows the inhalation air content of air flow meter 8, and the rotation signal which shows the number of rotations of engine 1 are inputted into computer 15, and fuel injection is controlled by computer 15 based on the signal which shows the basic fuel oil consumption computed by these signals. The above-mentioned exhaust steam turbine supercharging device 9 is everything but the above-mentioned compressor 10, It has turbine (turbine wheel) 18 fixed to the other end of compressor housing 16 which stored this compressor 1o, turbine shaft 17 which fixed compressor 10 to one end, and this Ri-pin axis 17, and turbine housing 19 which stored this turbine 18, Turbine 18 is interposed in flueway 2O connected to the exhaust air boat of exhaust valve 5. Bypass channel 21 which bypasses turbine 18 is formed in above-mentioned flueway 20, and it is in this bypass channel 21, Valve 23 of waist gate valve 22 which carries out opening and closing control of this passage 21 is provided, Pressure introducing pipe 24 of this waist gate valve 22 has two branch pipes 25.26, and one branch pipe 25 gives charge pressure to waist gate valve 22, It is connected to intake passage 6 of the lower stream of compressor 1o, and branch pipe 26 of another side is connected upstream of compressor 10, in order to miss a part of above-mentioned charge pressure to the atmosphere. And orifice 27.27 is formed in each branch pipe 25.26. Solenoid valve 28 which opens and closes the passage of this branch pipe 26 is infixed in above-mentioned branch pipe 26, this solenoid valve 28 is controlled by computer 15 when dropping charge pressure, and it is closed down, it is usually opened wide, and a part of charge pressure is missed by the atmosphere. Operation of the charge pressure control device constituted in this way is explained. That is, a maximum and a minimum are set up with the intake-air temperature by which the range which controls charge pressure was cooled by intercooler 11, It is set to the temperature which can prevent abnormal combustion which the intake-air temperature of a maximum is too high, and a knock tends to produce, As the intake-air temperature of a minimum is too low, unusual heating of the engine 1 is carried out in predetermined charge pressure, it is set to temperature which prevents engine 1 from suffering a damage and it is shown in Drawing 2, it supercharges in area A and controls charge pressure in area B. If fuel injection valve 14 is controlled by computer 15, and injects the fuel oil consumption computed based on an inhalation air content and the number of rotations of engine 1 and the exhaust gas of engine 1 is supplied to turbine 18 of exhaust steam turbine supercharging device 9, Compressor 10 rotates, an air intake is compressed and it is supercharged by engine 1 because this turbine 18 rotates. Since an intake-air temperature rises because supercharge uses exhaust air, intercooler 11 cools an air intake and supplies it to engine 1. On the other hand, solenoid valve 28 formed in branch pipe 26 of waist gate valve 22 is usually opened wide, it foresees that a part of charge pressure escapes from this branch pipe 26, and waist gate valve 22 is set up to control the usual charge pressure by charge pressure supplied from branch pipe 25 of another side. And when introductory charge pressure becomes the value set as this, this waist gate valve 22 opens valve 23 wide, misses exhaust gas to flueway 20 of the bypass channel 21 Yo litterbin 18 lower stream, and it operates so that charge pressure may be pressed down in a preset value. If the temperature in which intake temperature sensor 12 is lower than the preset temperature set as the minimum is detected, computer 15 will control solenoid valve 28 and will close branch pipe 26. Therefore, it is since a part of charge pressure missed by the atmosphere of the upper stream of compressor 10 with branch pipe 26 is introduced into waist gate valve 22, The introductory charge pressure of this valve 22 goes up, valve 23 is opened wide, by missing exhaust gas to flueway 20 of the turbine 18 lower stream via bypass channel 21, rotation of turbine 18 falls and charge pressure is dropped. As a result, when an intake-air temperature is low, the supercharge to engine 1 is controlled, unusual heating of engine 1 is prevented, and doing a damage to engine 1 is prevented. This working range is equivalent to area B of the low-temperature region of Drawing 2. If the temperature in which the above-mentioned intake temperature sensor 12 is more expensive than the preset temperature set as the maximum is detected, like the above-mentioned, computer 15 will control solenoid valve 28 and will close branch pipe 26. Therefore, like the above-mentioned, charge pressure falls, when an intake-air temperature is high, the supercharge to engine 1 is controlled, abnormal combustion which a knock tends to produce is prevented, and the reliability of engine 1 is raised, because rotation of turbine 18 falls. This working range corresponds to 1 rear B of the high temperature region of Drawing 2. the mechanical supercharger which drives a pump with the crankshaft which synchronizes with rotation of engine 1, for example, and supercharges with this pump in an above-mentioned example although the supercharger used exhaust steam turbine supercharging device 9 -- it is also -- it is good. Although intercooler 11 constituted the intake air cooling device, Also which uses other cooling devices is good. In the constitution of this invention, a supercharger is equivalent to exhaust steam turbine supercharging device 9 of an example, and it is an intake air cooling device similarly, It corresponds to intercooler 11, an intake temperature sensor is equivalent to intake temperature sensor 12, and a charge pressure adjustment device is equivalent to computer 15, waist gate pulp 22, pressure introducing pipe 24, branch pipe 25.26, and solenoid valve 28.

[Brief Description of the Drawings]

A drawing shows one example of this invention and Drawing 1 is a lineblock diagram of the charge pressure control device of an engine with a supercharger. Drawing 2 is a figure showing a charge pressure control range with charge pressure and an intake-air temperature. 1 ... Engine 6 ... Intake passage 9 ... Exhaust steam turbine supercharging device 11 [ ... Bypass channel 22 / ... Waist gate valve 24 / ... Pressure introducing pipe 25.26 / ... Branch pipe 28 / ... Solenoid valve ] ... Intercooler 12 ... Intake temperature sensor 15 ... Computer 21