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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYasushi Aoki, Takeshi Ohba, Iwao Nakamura, Ikuo Nonaga, Yukihisa Ishii
Estimating the term…
In an electric vehicle capable of regenerative braking of wheels, a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by operation of a brake operating element and a brake cylinder for a driven wheel. In a first region in which an input hydraulic pressure into the differential pressure regulating valve is equal to or less than a predetermined value, an output hydraulic pressure from the differential pressure regulating valve is maintained at zero, and in a second region in which the input hydraulic pressure exceeds the predetermined value, the output hydraulic pressure is lower than the input hydraulic pressure by the predetermined value. Further, in the first region, a regenerative braking force is determined in proportion to a quantity of operation of the brake operating element, and in the second region, the regenerative braking force is maintained at a constant value irrespective of the quantity of operation of the brake operating element. Thus, the regenerative braking force is preferentially generated at the start of braking, and after the regenerative braking force reaches a limit, a deficiency of braking force can be made up by the hydraulic braking force. Moreover, a sum total of the hydraulic braking force and the regenerative braking force can be proportioned to the quantity of operation of the brake operating element.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, and a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element and a brake cylinder for the driven wheel so as to reduce the hydraulic braking pressure from said master cylinder and transmit a reduced pressure to said brake cylinder, wherein said differential pressure regulating valve is formed to have such a characteristic that an output hydraulic pressure is maintained substantially at zero in a first region in which an input hydraulic pressure is equal to or lower than a predetermined value, and the output hydraulic pressure is lower than the input hydraulic pressure by substantially the predetermined value in a second region in which the input hydraulic pressure exceeds the predetermined value, and wherein, in said first region, a regenerative braking force is determined in proportion to a quantity of operation of the brake operating element, and in said second region, the regenerative braking force is maintained at a constant value irrespective of the quantity of operation of the brake operating element.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, and a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element and a brake cylinder for the driven wheel so as to reduce the hydraulic braking pressure from said master cylinder and transmit a reduced pressure to said brake cylinder, wherein said differential pressure regulating valve is formed to have such a characteristic that when a quantity of operation of the brake operating element is increased, an output hydraulic pressure is maintained at zero in a first region in which an input hydraulic pressure is increased but at or below a first predetermined value, and the output hydraulic pressure is increased to the largest value in a second region in which the input hydraulic pressure is increased above said first predetermined value, and when the quantity of operation of the brake operating element is decreased, the output hydraulic pressure is maintained at a constant value in a third region in which the input hydraulic pressure is decreased but still at a level above a second predetermined value, and the output hydraulic pressure is decreased to zero in a fourth region in which the input hydraulic pressure is decreased lower than the second predetermined value, and wherein a regenerative braking force is increased in said first region in accordance with an increase in the quantity of operation of the brake operating element;
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element and an accelerator operating element, said braking system comprising
A braking system tier an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be to a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, said means for controlling the regenerative braking force being operable to reduce the regenerative braking force during a steering operation of the vehicle as compared with the regenerative braking force during a non-steering operation of the vehicle.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element,
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including means for prohibiting the regenerative braking when said motor is brought into a driving state by the operation of an accelerator operating element.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including a brake operation quantity detecting sensor for detecting the quantity of operation of said brake operating element, said brake operation quantity detecting sensor including means for correcting, to zero, an output produced when said brake operating element is not operated.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including a timer which starts a count-down upon switching-over between the hydraulic braking and the regenerative braking, and means for maintaining a magnitude of the regenerative braking force at a constant value for a predetermined period of time on the basis of an output from said timer.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including a timer which starts a count-down upon switching-over between the hydraulic braking and the regenerative braking, and means for maintaining a magnitude of the hydraulic braking force at a constant value for a predetermined period of time on the basis of an output from said timer.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including a timer which starts the count-down upon switching-over between the hydraulic braking and the regenerative braking, and means for maintaining a magnitude of each of the hydraulic braking force and the regenerative braking force at a constant value for a predetermined period of time on the basis of an output from said timer.
A braking system for an electric vehicle having a driven wheel which is connected to and driven by a motor using a battery as an energy source, wherein the driven wheel is braked hydraulically and regeneratively on the basis of the operation of a brake operating element, a master cylinder for generating a hydraulic braking pressure by the operation of the brake operating element, and a brake cylinder for the driven wheel, an improvement comprising, means for controlling the hydraulic braking pressure from said master cylinder to maintain the hydraulic pressure at the brake cylinder substantially at zero in a region between no operation of the brake operating element and a predetermined magnitude of operation of the brake operating element, means for controlling a regenerative braking force which is determined in proportion to the magnitude of operation of the brake operating element so as to be a substantially maximum regenerative braking force at said predetermined magnitude of operation of the brake operating element, and further including a battery voltage sensor for detecting a battery voltage, and control means for comparing said battery voltage and a battery voltage limit with each other and, if said battery voltage exceeds the battery voltage limit, controlling the substantially maximum magnitude of the regenerative braking force of the motor.
Dependencies are inferred from the claim text.