A brake system including: (a) a manual hydraulic pressure source; (b) a power hydraulic pressure source; (c) a high pressure generator for generating high pressure, by utilizing pressure of the power hydraulic pressure source; (d) a common passage to which first and second brake cylinders and the hi
A brake system including: (a) a manual hydraulic pressure source; (b) a power hydraulic pressure source; (c) a high pressure generator for generating high pressure, by utilizing pressure of the power hydraulic pressure source; (d) a common passage to which first and second brake cylinders and the high pressure generator are connected; (e) a high-pressure-generator cut-off valve disposed between the common passage and the high pressure generator; (f) a first manual-pressure-source passage connecting a first individual passage and the manual hydraulic pressure source; (g) a first manual-pressure-source cut-off valve provided in the first manual-pressure-source passage; (h) a first valve provided between the second brake cylinder and a connected portion of the first individual passage which is connected to the first manual-pressure-source passage; and (i) a pressure-supply control device for controlling supply of pressure to the brake cylinders, by controlling the high-pressure-generator cut-off valve, first valve and first manual-pressure-source cut-off valve.
대표청구항▼
1. A brake system comprising: a plurality of hydraulic brakes provided for respective wheels of a vehicle, and configured to be activated by hydraulic pressures of respective brake cylinders thereof so as to restrain rotations of the respective wheels;a manual hydraulic pressure source which is conf
1. A brake system comprising: a plurality of hydraulic brakes provided for respective wheels of a vehicle, and configured to be activated by hydraulic pressures of respective brake cylinders thereof so as to restrain rotations of the respective wheels;a manual hydraulic pressure source which is configured to generate hydraulic pressure by operation of a brake operating member by an operator;a power hydraulic pressure source which is configured to generate hydraulic pressure by supply of electric energy thereto;a high pressure generator which is configured to generate hydraulic pressure that is higher than the hydraulic pressure of said manual hydraulic pressure source, by utilizing the hydraulic pressure of said power hydraulic pressure source;a common passage to which a first brake cylinder, a second brake cylinder and said high pressure generator are connected, said first brake cylinder being one of said brake cylinders of said hydraulic brakes and being connected to said common passage via a first individual passage, said second brake cylinder being one of said brake cylinders that is other than said first brake cylinder and being connected to said common passage via a second individual passage that is other than said first individual passage;a high-pressure-generator cut-off valve disposed between said common passage and said high pressure generator;a first manual-pressure-source passage connecting said first individual passage and said manual hydraulic pressure source;a first manual-pressure-source cut-off valve provided in said first manual-pressure-source passage;a first valve provided in a portion of a pressure supply passage which is located between a connected portion of said pressure supply passage and said second brake cylinder, said pressure supply passage including said first individual passage, second individual passage and common passage, said pressure supply passage being connected at said connected portion thereof to said first manual-pressure-source passage; anda pressure-supply control device configured to control supply of the hydraulic pressure to each of said first and second brake cylinders, by controlling at least said high-pressure-generator cut-off valve, first valve and first manual-pressure-source cut-off valve. 2. The brake system according to claim 1, wherein said pressure-supply control device includes an electromagnetic-valve controlling portion configured to control said high-pressure-generator cut-off valve, first valve and first manual-pressure-source cut-off valve, so as to establish a first state and a second state, such that the hydraulic pressure of said high pressure generator is supplied to said first brake cylinder and second brake cylinder by placing said high-pressure-generator cut-off valve and first valve first valve in open states and placing said first manual-pressure-source cut-off valve in a closed state when said first state is established, and such that the hydraulic pressure of said manual hydraulic pressure source is supplied to said first brake cylinder with said first brake cylinder being isolated from said high pressure generator and said second brake cylinder by placing said high-pressure-generator cut-off valve and first valve in closed states and placing said first manual-pressure-source cut-off valve in an open state. 3. The brake system according to claim 1, wherein each of said high-pressure-generator cut-off valve and said first valve is constituted by a normally-open electromagnetic valve that is to be placed in an open state when electric current is not being supplied to a solenoid thereof,and wherein said first manual-pressure-source cut-off valve is constituted by a normally-closed electromagnetic valve that is to be placed in a closed state when electric current is not being supplied to a solenoid thereof. 4. The brake system according to claim 1, comprising first and second manual hydraulic pressure sources and a second manual-pressure-source cut-off valve, wherein said first valve is provided in a portion of said pressure supply passage which is located between a high-pressure-generator connected portion of said pressure supply passage and said second brake cylinder, said pressure supply passage being connected at said high-pressure-generator connected portion thereof to said high pressure generator,wherein said first manual hydraulic pressure source is connected to said first brake cylinder via said first manual-pressure-source passage, while said second manual hydraulic pressure source is connected to said second brake cylinder via a second manual-pressure-source passage that is other than said first manual-pressure-source passage,and wherein said second manual-pressure-source cut-off valve is provided in said second manual-pressure-source passage. 5. The brake system according to claim 1, comprising first and second manual hydraulic pressure sources, wherein said first manual hydraulic pressure source is connected to said first brake cylinder via said first manual-pressure-source passage,wherein said second manual hydraulic pressure source is connected to said second brake cylinder via a second manual-pressure-source passage that is other than said first manual-pressure-source passage,wherein said first valve is provided in a portion of said pressure supply passage which is located between said connected portion of said pressure supply passage and a high-pressure-generator connected portion of said pressure supply passage, said pressure supply passage being connected at said high-pressure-generator connected portion thereof to said high pressure generator,said brake system comprising:a second manual-pressure-source cut-off valve provided in said second manual-pressure-source passage; anda second valve provided in a portion of said pressure supply passage which is located between said high-pressure-generator connected portion of said pressure supply passage and a second-manual-pressure-source-passage connected portion of said pressure supply passage, said pressure supply passage being connected at said second-manual-pressure-source-passage connected portion thereof to said second manual-pressure-source passage. 6. The brake system according to claim 5, wherein said second valve is constituted by a normally-closed electromagnetic valve that is to be placed in a closed state when electric current is not being supplied to a solenoid thereof,and wherein said second manual-pressure-source cut-off valve is constituted by a normally-open electromagnetic valve that is to be placed in an open state when electric current is not being supplied to a solenoid thereof. 7. The brake system according to claim 5, wherein said hydraulic brakes are provided for respective front right, front left, rear right and rear left wheels of the vehicle that constitute two pairs of wheels, each pair of the two pairs of wheels being constituted by two of the wheels located in respective positions that are diagonal to each other,wherein said brake cylinders of said hydraulic brakes are connected to said common passage via respective individual passages,wherein each of two of said individual passages, which are connected to respective two of said brake cylinders provided for respective two of the wheels that constitute one pair of the two pairs of wheels, is provided with a pressure-increasing control valve constituted by a normally-open electromagnetic valve that is to be placed in an open state when electric current is not being supplied to a solenoid thereof,and wherein each of two of said individual passages, which are connected to respective two of said brake cylinders provided for respective two of the wheels that constitute another one pair of the two pairs of wheels, is provided with a pressure-increasing control valve constituted by a normally-closed electromagnetic valve that is to be placed in a closed state when electric current is not being supplied to a solenoid thereof. 8. The brake system according to claim 1, wherein said hydraulic brakes are provided for respective front right, front left, rear right and rear left wheels of the vehicle,and wherein said brake cylinders of ones of said hydraulic brakes which are provided for the rear right and left wheels are connected to said common passage via a third individual passage,said brake system comprising a third valve which is provided in said third individual passage and which is constituted by a normally-closed electromagnetic valve that is to be placed in a closed state when electric current is not being supplied to a solenoid thereof. 9. The brake system according to claim 8, comprising a rear-wheel-brake-cylinder-side check valve which is provided in parallel with said third valve, wherein said rear-wheel-brake-cylinder-side check valve is configured to allow flow of a working fluid in a direction toward said common passage away from said brake cylinders of said ones of said hydraulic brakes which are provided for the rear right and left wheels, and to inhibit flow of the working fluid in a direction opposite to said direction toward said common passage away from said ones of said brake cylinders. 10. The brake system according to claim 1, wherein said power hydraulic pressure source is connected to said common passage via a passage bypassing said high pressure generator,said brake system comprising an output hydraulic pressure control device configured to control the hydraulic pressure outputted by said power hydraulic pressure source. 11. The brake system according to claim 1, wherein said high pressure generator is disposed among said first brake cylinder, said second brake cylinder, said power hydraulic pressure source and said manual hydraulic pressure source,and wherein said high pressure generator is to be activated mechanically by the hydraulic pressure of said manual hydraulic pressure source. 12. The brake system according to claim 11, wherein said high pressure generator includes (a) a mechanical pressure-increasing device configured to increase the hydraulic pressure of said manual hydraulic pressure source and to output the increased hydraulic pressure and (b) a high-pressure-side check valve disposed between said mechanical pressure-increasing device and said power hydraulic pressure source,and wherein said high-pressure-side check valve is configured to allow flow of a working fluid in a direction toward said mechanical pressure-increasing device away from said power hydraulic pressure source, and to inhibit flow of the working fluid in a direction opposite to said direction toward said mechanical pressure-increasing device away from said power hydraulic pressure source. 13. The brake system according to claim 12, wherein said mechanical pressure-increasing device includes (a) a housing, (b) a stepped piston which is fluid-tightly and slidably fitted in said housing and which has a large diameter portion and a small diameter portion, (c) a large diameter chamber which is located on a side of said large diameter portion of said stepped piston and which is connected to said manual hydraulic pressure source, (d) a small diameter chamber which is located on a side of said small diameter portion of said stepped piston and which is connected to said brake cylinders, (e) a high pressure chamber to which said power hydraulic pressure source is connected, and (f) a high-pressure supply valve which is disposed between said high pressure chamber and said small diameter chamber and which is to be switched from a closed state to an open state by forward movement of said stepped piston,wherein said high-pressure-side check valve is disposed between said high pressure chamber and said power hydraulic pressure source,and wherein said high-pressure-side check valve is configured to allow flow of a working fluid in a direction toward said high pressure chamber away from said power hydraulic pressure source, and to inhibit flow of the working fluid in a direction opposite to said direction toward said high pressure chamber away from said power hydraulic pressure source. 14. The brake system according to claim 13, wherein said high pressure generator includes a manual-side check valve disposed between said manual hydraulic pressure source and an output side portion of said mechanical pressure-increasing device,and wherein said manual-side check valve is configured to allow flow of the working fluid in a direction toward said mechanical pressure-increasing device away from said manual hydraulic pressure source, and to inhibit flow of the working fluid in a direction opposite to said direction toward said mechanical pressure-increasing device away from said manual hydraulic pressure source. 15. The brake system according to claim 1, wherein said high-pressure-generator cut-off valve is constituted by a normally-open electromagnetic valve that is to be placed in an open state when electric current is not being supplied to a solenoid thereof. 16. The brake system according to claim 1, wherein said power hydraulic pressure source includes a pump device and an accumulator that is configured to store therein a working fluid discharged from said pump device. 17. The brake system according to claim 1, wherein said power hydraulic pressure source is connected to said common passage via a passage bypassing said high pressure generator,said brake system comprising an output hydraulic pressure control device configured to control the hydraulic pressure outputted by said power hydraulic pressure source,wherein said pressure-supply control device includes an electromagnetic-valve controlling portion that is configured to place said high-pressure-generator cut-off valve, first valve and first manual-pressure-source cut-off valve in a closed state, an open state and a closed state, respectively, and to cause the hydraulic pressure controlled by said output hydraulic pressure control device to be supplied to said common passage in a state in which said common passage is isolated from said high pressure generator while said first brake cylinder is isolated from said manual hydraulic pressure source. 18. The brake system according to claim 1, comprising: a fluid-leakage possibility detecting device configured to detect presence of possibility of fluid leakage in said brake system; andan electromagnetic-valve controlling portion configured to place at least said first valve in a closed state when the presence of possibility of fluid leakage is detected by said fluid-leakage possibility detecting device. 19. The brake system according to claim 1, wherein said high pressure generator is disposed among said first brake cylinder, said second brake cylinder, said power hydraulic pressure source and said manual hydraulic pressure source,and wherein said high pressure generator is to be activated mechanically by the hydraulic pressure of said manual hydraulic pressure source that is constituted by a pressurized chamber of said master cylinder.
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이 특허에 인용된 특허 (13)
Yamamoto, Takayuki; Komazawa, Masaaki; Miyazaki, Tetsuya, Brake control system.
Hiroshi Isono JP; Yasuji Mizutani JP, Vehicle braking system having devices for controlling fluid flows between pressurizing and assisting chambers of master cylinder and pressure source and reservoir.
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