Abstract: A model transmission apparatus used when producing a system model. In the model transmission apparatus, models are transmitted between first computers and a second computer. The second computer includes a second transmission device that transmits a system model to each of the first computers. When the system model is transmitted, component models included in the system model are concealed. When at least one of the concealed component models included in the system model matches at least one corresponding component model stored in the first storage device of at least one of the first computers, the at least one of the first computers automatically replaces the at least one of the concealed component models included in the system model with the at least one corresponding component model stored in the first storage device of the at least one of the first computers.

Abstract: In a system model production support apparatus and method, plural partial models are stored along with input/output information for each partial model; an input-side portion of the system model is produced by sequentially selecting the partial models constituting the input-side portion from among the stored partial models in an order starting from the partial model closest to an input-side end of the system model, based on input information for the system model, and the input/output information for each partial model, and sequentially connecting the selected partial models; an output-side portion of the system model is produced by sequentially selecting the partial models constituting the output-side portion from among the stored partial models in an order starting from the partial model closest to an output-side end of the system model, based on output information for the system, and the input/output information for each partial model, and sequentially connecting the selected partial models; and the produced

Abstract: An abnormality diagnosis system 100 includes a VVT controller 110, an adjustable valve mechanism 120, a cam angle sensor 130, a model computation module 140, an abnormality detection module 150, and an alarm lamp 160. The adjusable valve mechanism 120 advances or delays a phase angle of an intake cam shaft relative to a crankshaft, thereby varying an open-close timing of a valve. The model computation module 140 computes a physical behavior of the adjustable valve mechanism 120 according to a physical model, in response to a control signal input from the VVT controller 110. The abnormality detection module 150 determines whether the adjustable valve mechanism 120 is abnormal or normal, based on a difference between a theoretical value of phase angle calculated according to the physical model and an observed value of phase angle measured with the cam angle sensor 130. The arrangement of the invention ensures highly accurate abnormality diagnosis of the adjustable valve mechanism 120.

Abstract: An abnormality diagnosis system 100 includes a VVT controller 110, an adjustable valve mechanism 120, a cam angle sensor 130, a model computation module 140, an abnormality detection module 150, and an alarm lamp 160. The adjustable valve mechanism 120 advances or delays a phase angle of an intake cam shaft relative to a crankshaft, thereby varying an open-close timing of a valve. The model computation module 140 computes a physical behavior of the adjustable valve mechanism 120 according to a physical model, in response to a control signal input from the VVT controller 110. The abnormality detection module 150 determines whether the adjustable valve mechanism 120 is abnormal or normal, based on a difference between a theoretical value of phase angle calculated according to the physical model and an observed value of phase angle measured with the cam angle sensor 130. The arrangement of the invention ensures highly accurate abnormality diagnosis of the adjustable valve mechanism 120.

Abstract: Hydraulic pressure control apparatus for controlling a pressure of a brake cylinder pressure, including a pump device connected to the brake cylinder and including at least one set of a pump for delivering a pressurized fluid to the brake cylinder and a pump operating electric motor, a low-pressure source for storing the fluid discharged from the brake cylinder, a solenoid-operated pressure control valve disposed between the low-pressure source and the brake cylinder and operated with an electric energy applied thereto, for controlling the brake cylinder pressure depending upon the electric energy, and a controller including a pressure increase control device for increasing the brake cylinder pressure by controlling the electric motor, and a pressure reduction control device or reducing the brake cylinder pressure by controlling the electric energy applied to the control valve.

Abstract: Hydraulic pressure control apparatus wherein a pressure difference across a seating valve disposed in a fluid passage acts on a valve member for placing the seating valve in an open state, while an elastic member biases the valve member for placing the seating valve in a closed state, and a valve driving device operated with an electric current applied thereto generates a drive force acting on the valve member so as to open the seating valve. A control device for controlling the electric current includes a stepping controller for incrementing the amount of the electric current when the seating valve is operated from the closed state into the open state, such that an increment of the electric current decreases with an increase in the pressure difference. The hydraulic pressure control apparatus may be suitably used in a vehicle braking system, for controlling fluid pressure in wheel brake cylinder.

Abstract: Vehicle hydraulic braking system including a brake including a wheel brake cylinder operated with a pressurized fluid to brake a vehicle wheel, a seating valve having a valve member movable toward and away a valve seat and biased in a first direction for seating of the valve member onto the valve seat, and a valve driving device for generating a valve drive force acting on the valve member in a second direction opposite to the first direction, and a seating valve control device for controlling the valve driving device to selectively open and close the seating valve, for thereby regulating a pressure of the fluid in the wheel brake cylinder, and wherein the seating valve control device includes a seating velocity reducing device for commanding the valve driving device to generate a valve drive force, during at least a portion of a movement of the valve member for seating onto the valve seat, for reducing a seating velocity of the valve member.

Abstract: A braking control system for a motor vehicle in which various braking controls, including an antiskid braking control and a traction control, are realized comprehensively, accurately and smoothly without being based on the slip factor of a wheel. The actual wheel speed (Wvr) of the rear wheel side is detected, and the desired wheel speed (Wrf) of the front wheel side is set so as to be lower than the actual wheel speed (Wvr). Besides, the actual wheel speed (Wvf) of the front wheel side is detected, and the deviation (ef) between the actual wheel speed (Wvf) and the desired wheel speed (Wrf) is detected. Subsequently, the desired braking torque (Nrf) of the front wheel side is calculated from the deviation (ef) and the actual wheel speed (Wvf). Further, the desired braking torque (Nrr) of the rear wheel side is set on the basis of the desired braking torque (Nrf). The braking pressure of the braking apparatus is controlled so as to establish the desired braking torques (Nrf) and (Nrr).