Hydraulic hybrid vehicle method of safe operation
First Claim
1. A process for initializing a hydraulic hybrid vehicle system, comprising:
- signaling initialization of the system;
checking a position of a mode valve of the system;
checking a displacement setting of a hydraulic motor of the system;
coupling a high-pressure fluid supply to the system only if the mode valve is at a neutral position or if the displacement setting is at zero; and
enabling operation of the vehicle only if, after performing the coupling step, the mode valve is at the neutral position and the displacement setting is at zero.
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Accused Products
Abstract
A hydraulic hybrid vehicle includes elements such as a hydraulic pump driven by an internal combustion engine and arranged to draw in low pressure fluid and pump the fluid at high pressure to an accumulator. A hydraulic motor is powered by the pressurized fluid. Safety processes are provided for detecting and addressing a number of conditions that may arise in the operation of the hydraulic hybrid vehicle, including an initialization procedure for start-up of the vehicle, a shut-down procedure, and procedures for detecting and responding to failure of the pump or motor, internal and external fluid leaks, and non-responsive actuation and mode control systems.
85 Citations
24 Claims
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1. A process for initializing a hydraulic hybrid vehicle system, comprising:
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signaling initialization of the system; checking a position of a mode valve of the system; checking a displacement setting of a hydraulic motor of the system; coupling a high-pressure fluid supply to the system only if the mode valve is at a neutral position or if the displacement setting is at zero; and enabling operation of the vehicle only if, after performing the coupling step, the mode valve is at the neutral position and the displacement setting is at zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A process for initializing a hydraulic hybrid vehicle system, comprising:
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signaling initialization of the system; checking a position of a mode valve of the system; checking a displacement setting of a hydraulic motor of the system; coupling a high-pressure fluid supply to the system if either the mode valve is at a neutral position or the displacement setting is at zero; commanding the displacement setting to zero if, after performing the coupling step, the displacement setting is not at zero; rechecking the displacement setting of the hydraulic motor after performing the commanding step; decoupling the high-pressure fluid from the system if, after performing the coupling step and the rechecking step, the displacement setting is not at zero; and enabling operation of the vehicle if, after performing the coupling step and the rechecking step, the mode valve is at the neutral position and the displacement setting is at zero. - View Dependent Claims (22)
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23. A process for initializing a hydraulic hybrid vehicle system, comprising:
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signaling initialization of the system; checking a position of a mode valve of the system; checking a displacement setting of a hydraulic motor of the system; coupling a high-pressure fluid supply to the system if either the mode valve is at a neutral position or the displacement setting is at zero; enabling operation of the vehicle if, after performing the coupling step, the mode valve is at the neutral position and the displacement setting is at zero checking a position of a shift selector after the signaling step and before performing the coupling step; and canceling the enabling step if the shift selector is not in either a park or a neutral position. - View Dependent Claims (24)
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Specification