Abstract: A check valve (8) and a booster (9) are inserted in parallel in a supplied fuel line (6) connecting a common rail (5) and an injection valve (7), a piston (10E) of a hydraulic circuit (10) is driven for positioning by a piezoelectric actuator (PA-1), the pressures in a chamber (9Db) of the booster (9) and the pressure in a fuel chamber (7G) of the injection valve (7) are selectively lowered by controlling the alignment state between ports (10Eb), (10Ec) provided in the piston (10E) to communicate with a low-pressure portion and an opening 10Aa of a first chamber 10A and an opening (10Ba) of a second chamber (10B) of cylinder (10C), whereby the pressure of the fuel supplied to the fuel reservoir (7B) of the injection valve (7) is rapidly switched to one or the other of high-pressure fuel from the common rail (5) and pressure-boosted high-pressure fuel from the booster (9).

Abstract: Increase in quantity of particulates during a prescribed time period is acquired as first difference data (DX) that is based on pressure differential ?P across a filter (32) and derived from first estimation data (D2) obtained from a first estimation calculator (52) and is simultaneously acquired as second difference data (DY) that is based on integration of the quantity of particulate generation per unit time and derived from second estimation data (D3) obtained from a second estimation calculator (53), and the second estimation data (D3) is corrected using correction data (D4) calculated from the first and second difference data (DX, DY) to acquire corrected second estimation data (D6). A discriminator (73) determines which of the first estimation data (D2) and corrected second estimation data (D6) is suitable data and the regeneration control of the filter is conducted using the so-selected estimation data (Q).

Abstract: Five receiving holes 2e extending along the axis of a circular cylindrical portion 2b of a housing are formed in the circular cylindrical portion 2b. Those five receiving holes 2e are arranged at equal intervals in the peripheral direction of the circular cylindrical portion 2b. Each receiving hole 2e rotatably receives therein a planetary gear 5. The respective planetary gears 5 are in engagement with an inner gear 3 and a sun gear 4. The teeth of the inner gear 3, the sun gear 4 and the planetary gears 5 are helical teeth. The numbers of teeth of the inner gear 3, the sun gear 4 and the planetary gears 5 are set to 36, 24 and 6, respectively. As a result, the numbers of teeth of the inner gear 3 and the sun gear 4 located between adjacent two planetary gears 5 in the peripheral direction become 7.2 and 4.8, respectively, which are values each having a fraction below the decimal point.

Abstract: A receiving portion 2e for rotatably receiving therein a planetary gear 3, is formed between a plurality of retaining protrusions 2d of a carrier. A connection portion 2f extending annularly about a rotation axis L is formed on an outer peripheral of a distal end portion of each retaining protrusion 2d. Through this connection portion 2f, the distal end portions of the respective retaining protrusions 2d are connected to each other. Owing to this arrangement, each retaining protrusion 2d is reinforced to minimize its deformation. As a result, deformation of the receiving portion 2e is greatly reduced and the planetary gear 3 receiving in the receiving portion 2e can rotate smoothly.

Abstract: In a fuel injection apparatus (1) configured so that high-pressure fuel from a common rail (2) is supplied to an injector (8) through a pressure booster (4), it is discriminated whether reduction of the fuel pressure in the common rail (2) is necessary, the spill amount of the high-pressure fuel necessary for pressure reduction is computed when pressure reduction is discriminated to be necessary, and a control solenoid valve (48) is open/close controlled to spill said spill amount of the high-pressure fuel to the low-pressure side at a time point when fuel injection from the injector (8) is not being conducted.

Abstract: A tubular member 18 is slidably fitted into a valve body, and is formed with a vacuum valve seat 21. The tubular member 18, a valve plunger 16 and the valve body 3 are maintained in their inoperative positions shown by abutment against a key member 13. A holder 14 is formed with a tapered surface 14a to assist in allowing an elastic deformation of a reaction disc 15. Immediately after the commencement of operation of a valve mechanism 7 as an input shaft 8 is driven forward, the input shaft 8 and the tubular member 18 are maintained in their inoperative positions until a rear end face of a variable pressure passage 28 abuts against the key member 13. The operating stroke of an input shaft 6 can be chosen to be less than the operating stroke of an output shaft 11 while preventing the jumping value from increasing to an excessively high value.

Abstract: A planetary gear mechanism 3 is provided at one end portion of a housing 2 in a direction of the rotation axis L. The mechanism 3 includes a planetary gear 31 disposed at the housing such that the planetary gear is rotatable about its own axis and revolvable about the rotation axis together with the housing, and an inner gear 33 and a sun gear 34 which are in mesh with the planetary gear. A differential gear mechanism 4 is provided at the other end portion of the housing. The mechanism 4 includes a casing 41 non-rotatably connected to the sun gear, a pair of pinion gears 43 disposed within the casing such that the pinion gears are rotatable about their axes and revolvable about the rotation axis together with the casing, and a pair of side gears 44, which are in mesh with the pinion gears.

Abstract: A base 36A of an output shaft 36 is made up of a rod member 36B, and a holder 43 having a bottom 43A. A stop 42 is formed separately from the holder. The holder has a reduced diameter portion 43B, in which an outer coiled spring 41A and an inner coiled spring 41B are disposed, and a piston 40 is disposed rearward thereof, and an increased diameter portion 43D in which the stop is disposed, and a reaction disc 35 is disposed rearward thereof.

Abstract: A fuel feed pump is provided that has a fuel flow-rate regulating valve, on the inlet side. The fuel flow-rate regulating valve includes a housing with a fuel inlet port and a fuel outlet port, a valve mechanism for controlling the flow rate of the fuel from the inlet port to the outlet port, and a regulating mechanism for regulating a backpressure to control the position of a needle valve of the valve mechanism in response to a system pressure, to thereby control the flow rate by controlling the fuel flow through an opening provided in a valve chamber. This arrangement makes it difficult for contamination to accumulate, and also enables a low-cost implementation.

Abstract: In a negative pressure boosting device, a movable valve seat is air-tightly and slidably disposed in a concavity of a valve body. The movable valve seat and a valve element compose a vacuum valve. A servo ratio changing device includes a control spring compressed and disposed between the movable valve seat and the valve body. The servo ratio changing device is provided on a valve mechanism (the vacuum valve). During operation, the valve element comes in contact with the movable valve seat. The movable valve seat does not move in a low-input range so that the servo ratio is a relatively large ratio for the normal operation. In a high-input range, the control spring starts to be compressed to move the movable valve seat, thereby changing the servo ratio to a small ratio.

Abstract: A fuel injection pump includes a cam shaft (7) driving a plunger (4) and a feed pump (3) assembled therein for feeding fuel pressured by the plunger (4). A flange part (52) projecting radially is provided on the cam shaft (7), an internal gear (41) transmits a power to the feed pump (7), and a housing member (8c) rotatably supports the cam shaft (7) on the free end opposite to the end part of the driven side of the cam shaft (7). A housing member (8c) rotatably supporting the cam shaft (7) through a radial bearing (12) is held between the flange part (52) and the internal gear (41) so as to allow adjustment of the axial position of the cam shaft (7), so that adjustment of the axial position of the cam shaft is substituted for the existing member assembled into the pump. Thus, an axial gap due to a deterioration of durability of the bearing is eliminated to be adjusted so as to facilitate the assembly, reduce the number of parts, and reduce the size of the injection pump.

Abstract: A fuel injection pump includes a plurality of plungers and a cam shaft having a plurality of drive cams (31, 32) corresponding to the plungers. The cam shaft is rotated by a power from the outside so as to reciprocate the plurality of plungers by the corresponding drive cams, and fuel is pressurized and force-fed in the forward stroke of each plunger. All or a part of the drive cams (31, 32) are installed with the phase thereof shifted, and the cam lobes (31a, 32a) of the drive cams are formed asymmetrical so that the amount of displacement of the plungers relative to a unit cam rotating angle is reduced in the forward stroke more than in the backward stroke of the plunger. Thus, the pressure variation in a common rail is reduced, the pressure resistance of the entire system is lowered, and the drive torque is reduced so as to reduce the load and noise of a drive system.

Abstract: A brake booster 1 includes a valve mechanism 6, and a solenoid 8 which operates the valve mechanism 6. When the solenoid 8 is energized, a solenoid plunger 26 and a valve seat member 11 move rearward relative to a valve body 3, whereby the valve mechanism 6 is operated to actuate the brake booster 1 without depressing a brake pedal. A core member 27 which forms a magnetic path for the solenoid 8 is disposed rearward of the solenoid plunger 26 so as to be movable axially of the valve body and so as to move in linked relationship with a valve plunger 13. The invention allows the size of the solenoid 8 to be reduced.

Abstract: When a booster is inoperative, a first atmosphere valve and a second atmosphere valve are both closed to block a communication of an orifice passage with a variable pressure chamber. At the commencement of operation of the booster, the first atmosphere valve opens while the second atmosphere valve remains closed to allow the atmosphere to be introduced into the variable pressure chamber through the orifice passage, followed by an opening of the second atmosphere valve to allow the atmosphere to be introduced into the variable pressure chamber through the second atmosphere valve and the first atmosphere valve. This arrangement allows the occurrence of oscillations of or abnormal sounds from a valve mechanism to be prevented during the initial phase of the brake operation.

Abstract: A housing (10) has a planetary gear mechanism (20) composed of an inner gear (21), a planetary gear (22) and a sun gear (23), which mechanism is disposed within the housing (10) on its outer periphery side. The inner gear (21) is connected with a casing (31) arranged on a rotation axis (L). A spherical receiving portion (31a) is formed on the casing (31). This receiving portion (31a) is received in the sun gear (23). A pair of element gears (33, 33) and a pair of side gears (34, 34) of the planetary gear mechanism (30) are received in the receiving portion (31a).

Abstract: During a normal brake operation, a brake reaction from a reaction disc is transmitted to a valve plunger through an outer plunger and an inner plunger. During an emergency brake operation, as a valve plunger is driven forward through a given stroke relative to a valve body, a tubular member retracts relative to the valve body. In a servo balance condition, which is reached subsequently, the valve plunger, retracts by an amount corresponding to the retraction of the tubular member, and the outer plunger abuts against a holder. A brake reaction from the reaction disc is transmitted to the valve plunger only through the inner plunger, allowing a booster ratio to be greater and a jumping quantity to be greater than during a normal brake operation. It is possible to increase an output from a brake booster 1 rapidly in immediate response to a quick depression of a brake pedal.

Abstract: An object of the present invention is to provide an accumulator fuel injection system comprising a pressure increasing unit 7 and a pressure increasing common rail 6, in which leaked fuel is recirculated from a high pressure side to a low pressure side, and which is capable of reducing the amount of fuel that must be delivered under pressure by a low pressure pump 3. The focus of the present invention is to return high pressure leaked fuel to between the low pressure pump 3 and a high pressure pump 5.

Abstract: When a method for operating a reference speed judges that an ABS control is being executed, the method judges whether the ABS control is being executed to a front wheel or not. When the method judges that the ABS control is not executed to the front wheel, the method considers that the lifting of a rear wheel does not occur, and makes the reference speed follow the fastest wheel speed VRH. When the method judges that the ABS control is being executed to the front wheel, and further judges that a reference body deceleration is a predetermined value or more, the method considers that the lifting of the rear wheel has occurred, and makes the reference speed follow a speed VRM. The speed VRM is a wheel speed calculated in accordance with the following formula: VRM=&agr;VRL+(1−&agr;)VRH (0<&agr;<1), where &agr; character VRL indicates the slowest wheel speed, and a character &agr; indicates a default.

Abstract: By a method for detecting an output-stuck fault of a car body acceleration sensor, an absolute value of a relative difference between the logical car body acceleration operated on the basis of a wheel speed and the physical car body acceleration output from a car body acceleration sensor is obtained, and the obtained absolute value of the relative difference is compared with a first rated value. When the absolute value of the relative difference exceeds the first rated value, a fail counter is made to start to count up at that point of time. When a counted value of the fail counter exceeds one second during the absolute value of the relative difference is exceeding the first rated value, the difference of the maximum value and the minimum value of the physical car body acceleration during the period is compared with a second rated value.

Abstract: In a negative pressure boosting device of the present invention, upon depression of a pedal at a normal speed, an input shaft 11 and a valve plunger 10 move forward to close a vacuum valve 15 and open an atmospheric Valve 16 and a power piston 5, a valve body 4, and an output shaft 24 move forward. In the initial stage of operation, hooks 27c and 31a are not engaged with each other so that a cylindrical member 27 does not move forward, thereby shortening the stroke of the input shaft 11 as compared to a conventional one. Upon rapid depression of the pedal, a press face 10a presses a pressed face 27e so as to deform an engaging arm portion 27b, thereby disengaging the hooks 27c and 31a from each other. The cylindrical member 27 is moved backward by a spring 30 to push a vacuum valve portion 12b so that the atmospheric valve portion 12a is spaced apart from the atmospheric valve seat 14 more rapidly than that of the service braking, thereby increasing the jumping amount and thus rapidly intensifying the output.