EP0335413A2
Expired / Lapsed
EP
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Supercharging device of an engine
Assignee: Mazda Motor Corp
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Filing: 1989-03-31
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Granted: —
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Expires: 2009-03-31
Abstract
Abstract In the present invention, in addition to a main throttle valve (4) which is conventional, a sub-throttle valve (5) for exclusive use of a supercharger is provided. By this sub-throttle valve (5), a flow rate of intake air is throttled by the fixed amount when the mechanical supercharger (6) is switched from a non-connected state over to a connected state. This makes it possible to prevent supercharged air from being bypassed to the upper stream of the supercharger through the bypass (21) and also prevent generation of air intake noises. Moreover, in the case where the mechanical supercharger (6) is of a type involving the interior compression, at the time of switching operation of the switching means, torque shock can be prevented and controllability on engine output by the accelerator pedal is improved.
Inventors
- 👤 Tsuyoshi C/O Motor Corporation Goto
- 👤 Kouichi C/O Motor Corporation Hatamura
- 👤 Shinji C/O Motor Corporation Seike
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:32
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/44; F02B33/446; F02B39/00; F02B39/02; F02B39/12; F02B39/16
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
202 words
A supercharging device of an engine comprising: a air intake passage for supplying intake air to the engine, a mechanical supercharger which is provided in said air intake passage and is driven by an output shaft of the engine, a switching means which switches said mechanical supercharger from a connected state over to a non-connected state in relation to said output shaft of the engine, a bypass provided in said air intake passage in such a fashion that it bypasses said mechanical supercharger, a main throttle valve provided in the air intake passage upstream a joint of the bypass on an intake side of the supercharger, and a sub-throttle valve provided in the air intake passage between a joint of the bypass on an intake side of the supercharger and the mechanical supercharger, said sub-throttle valve throttles further a flow rate of intake air by the fixed amount in addition to throttling of a flow rate of intake air by the said main throttle valve when the mechanical supercharger is switched from a non-connected state over to a connected state and after this switchover, opens in response to an increase of required output of the engine or opens with a time lag
Claim 2
Dependent Claim
202 words
A supercharging device of an engine comprising: a air intake passage for supplying intake air to the engine, a mechanical supercharger which is provided in said air intake passage and is driven by an output shaft of the engine, a switching means which switches said mechanical supercharger from a connected state over to a non-connected state in relation to said output shaft of the engine, a bypass provided in said air intake passage in such a fashion that it bypasses said mechanical supercharger, a main throttle valve provided in the air intake passage upstream a joint of the bypass on an intake side of the supercharger, and a sub-throttle valve provided in the air intake passage between a joint of the bypass on an intake side of the supercharger and the mechanical supercharger, said sub-throttle valve throttles further a flow rate of intake air by the fixed amount in addition to throttling of a flow rate of intake air by the said main throttle valve when the mechanical supercharger is switched from a non-connected state over to a connected state and after this switchover, opens in response to an increase of required output of the engine or opens with a time lag
Claim 3
Dependent Claim
44 words
A supercharging device of an engine as defined in Claim 1, wherein the switching means is so designed that it is put in a non-connected state at the time of low load and put in a connected state at the time of high load.
Claim 4
Dependent Claim
69 words
A supercharging device of an engine as defined in Claim 2, wherein a adjusting valve which opens when at least the switching means is in a non-connected state is provided in the bypass and the bypass has a passage area which is large enough to secure a flow rate of intake air sufficient for producing required output of the engine when the switching means is in a non-connected state.
Claim 5
Dependent Claim
45 words
A supercharging device of an engine as defined in Claim 3, wherein the adjusting valve is so designed that it closes from an opened state at almost the same time as the switching means is switched from a non-connected state over to a connected state.
Claim 6
Dependent Claim
50 words
A supercharging device of an engine as defined in Claim 3, wherein the adjusting valve is a one-way valve which opens only when a pressure of intake air on a discharge side of the supercharger is lower than a pressure of intake air on an intake side of the supercharger.
Claim 7
Dependent Claim
55 words
A supercharging device of an engine as defined in Claim 4, wherein the sub-throttle valve is so designed that it increases its opening, together with the main throttle valve, in response to an increase of required output of the engine after the switching means is switched from a non-connected state over to a connected state.
Claim 8
Dependent Claim
55 words
A supercharging device of an engine as defined in Claim 6, wherein the sub-throttle valve is so designed that its opening increases by such a degree that output torque of the engine equals to driving torque of the mechanical supercharger when the switching means is switched from a non-connected state over to a connected state.
Claim 9
Dependent Claim
45 words
A supercharging device of an engine as defined in Claim 7, wherein the switching means is so designed that it is in a connected state while the engine running speed is more than a fixed number of revolutions, even at the time of low load.
Claim 10
Dependent Claim
23 words
A supercharging device of an engine as defined in Claim 8, wherein the mechanical supercharger is of a type involving the interior compression.
Claim 11
Dependent Claim
37 words
A supercharging device of an engine as defined in Claim 9, wherein the sub-throttle valve is so controlled that discharge air pressure of the mechanical supercharger approaches intake air pressure at the downstream from the mechanical supercharger.
Claim 12
Dependent Claim
41 words
A supercharging device of an engine as defined in Claim 10, wherein the sub-throttle valve is so controlled that discharge air pressure of the mechanical supercharger is made almost equal to intake air pressure at the downstream from the mechanical supercharger.
Claim 13
Dependent Claim
42 words
A supercharging device of an engine as defined in Claim 9, wherein the interior compression ratio of the mechanical supercharger is set at a value to be obtained by dividing suction force of the mechanical supercharger by suction force of the engine.
Claim 14
Dependent Claim
20 words
A supercharging device of an engine as defined in Claim 9, wherein the mechanical supercharger is a screw type supercharger.
Claim 15
Dependent Claim
36 words
A supercharging device of an engine as defined in Claim 9, wherein the main throttle valve and the sub-throttle valve are connected through the medium of a link mechanism and are so designed that both interlock.
Claim 16
Dependent Claim
121 words
A supercharging device of an engine as defined in Claim 9, wherein the switching means is so designed that it receives a signal corresponding to intake air pressure at the downstream of the main throttle valve and when an absolute value of this intake air pressure becomes higher than a fixed value, it is switched from a non-connected state to a connected state, and the adjusting valve is operated by an actuator which makes intake air pressure at the downstream from the throttle value as an operating source and biassing force of a spring which is provided at the actuator and biases the adjusting valve in a closing direction is set at such force which corresponds to the foregoing fixed value.
Claim 17
Dependent Claim
23 words
A supercharging device of an engine as defined in Claim 1, wherein the mechanical supercharger is of a type involving the interior compression.
Claim 18
Dependent Claim
38 words
A supercharging device of an engine as defined in Claim 16, wherein the sub throttle valve is so controlled that discharge air pressure of the mechanical supercharger approaches intake air pressure at the downstream from the mechanical supercharger.
Claim 19
Dependent Claim
41 words
A supercharging device of an engine as defined in Claim 17, wherein the sub-throttle valve is so controlled that discharge air presure of the mechanical supercharger is made almost equal to intake air pressure at the downstream from the mechanical supercharger.
Claim 20
Dependent Claim
42 words
A supercharging device of an engine as defined in Claim 16, wherein the interior compression ratio of the mechanical supercharger is set at a value to be obtained by dividing suction force of the mechanical supercharger by suction force of the engine.
Claim 21
Dependent Claim
55 words
A supercharging device of an engine as defined in Claim 1, wherein the sub-throttle valve is so designed that when the switching means is switched from a non-connected state over to a connected state, its opening increases by such a degree that output torque of the engine corresponds to driving torque of the mechanical supercharger.
Claim 22
Dependent Claim
77 words
A supercharging device of an engine as defined in Claim 1, wherein a passage area of the air intake passage near the main throttle valve and a passage area of the air intake passage near the sub-throttle are set almost equal and the opening of the sub-throttle valve when the switching means is switched from a non-connected state over to a connected state is set smaller than the opening of the main throttle valve at that time.
Claim 23
Dependent Claim
42 words
A supercharging device of an engine as defined in Claim 1, wherein the sub-throttle valve is so controlled that after the switching means is switched from a non-connected state over to a connected state, it opens gradually with the lapse of time.
Claim 24
Dependent Claim
51 words
A supercharging device of an engine as defined in Claim 22, wherein the switching means is so designed that it is switched over in response to the opening of the actuator and at a full opening of the accelerator it is switched from a non-connected state over to a connected state.
References Cited (Backward Citations)
No citation records indexed.
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