| 摘要 |
PURPOSE:To aim at improvements in a rate of fuel consumption and operability, by setting the desired revolving speed of a prime mover on the basis of size in an operating signal out of an operating lever for a pump tilting command. CONSTITUTION:An operating signal XO out of an operating lever for a pump tilting command is inputted into a pump regulator 4 and a function generator 13. In a range where the operating signal XO is below the setting value (a), the function generator 13 generates a fixed low speed desired revolving speed signal NL and a fuel injection quantity and the discharge of a hydraulic pump 3 are controlled whereby a prime mover 1 is driven with low speed and low output. When the operating signal XO is made to go up beyond the setting valve (a), the desired revolving speed NO is automatically adjusted so that operation sensation of a driver comes to being satisfactory enough. When the operating signal XO is made to go up beyond the setting value (b), the prime mover 1 is automatically driven in a maximum output range where the revolving speed is high. Thus, improvement in a rate of fuel consumption and operatability are well promoted. |
