Electric car controller and control method
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsHiroyuki Yamada, Minoru Kaminaga, Takuma Nomura
Life of this patent
Estimating the term…
Abstract
The electric car controller is characterized in that evaluation two-phase/three-phase converting means (15) for calculating a three-phase evaluation current indication value is provided in control means, and current detected value from current detecting means (8) and evaluation current indication value are compared with each other by a deviation computing means (17). This result is evaluated by error evaluation means (18), and is sent to target command computing means (10), whereby the operation of a drive apparatus is stopped or continued.
Claims16
An electric car controller which provides dq-axis vector current control for separate and independent control of primary current to be supplied to a stator of an alternating current motor based on a q-axis control current command value and a d-axis control current command value, and which provides current feedback control by detecting the primary current of said alternating current motor by current detecting means:
- said controller comprising;
- an operation processing unit for generating a control current command value based on a command value to supply it to said alternating current motor and for performing current feedback control through detection by said current detecting means and conversion by current converting means, and
- an evaluation processing unit for generating a current command value for evaluation and performing evaluation to see if said current detecting means is normal or not:
- said evaluation processing unit characterized by comprising;
- a step of generating an evaluation current command value for comparison and evaluation unaffected by said current feedback and independently of said control current command value, based on said q-axis control current command value and said d-axis control current command value using command value converting means,
- a step of comparing between an alternating current detected value detected by said current detecting means without being converted by said current converting means and said evaluation current command value, and
- a step of determining that said current detecting means is incorrect if the result of comparison has exceeded a threshold value.
An electric car controller comprising a step of regulating the amplitude and phase of the primary current to be supplied to an alternating current motor and controlling the speed or torque of said alternating current motor, by dq-axis vector current control which provides separate and independent control of the primary current supplied to the stator of said alternating current motor, namely, a q-axis current component as a torque component based on a q-axis control current command value and a d-axis current component as an exciting component based on a d-axis control current command value;
- wherein said primary current is applied to said alternating current motor and is controlled by electric power converting means, and said primary current to said alternating current motor is detected as an alternating current detected value by current detecting means:
- said controller comprising;
- an operation processing unit for generating a control current command value based on a command value to supply it to said alternating current motor and for performing current feedback control, and
- an evaluation processing unit for generating a current command value for evaluation and performing evaluation to see if said current detecting means is normal or not:
- said operation processing unit comprising a step of providing feedback current control by detecting said primary current as a q-axis current detected value and a d-axis current detected value and converting it through current converting means, and by comparing between said q-axis control current command value and said q-axis current detected value, and between said d-axis control current command value and said d-axis current detected value;
- said evaluation processing unit characterized by comprising;
- a step of generating an evaluation current command value for comparison and evaluation independently of said current command value for feedback control, based on said q-axis control current command value and said d-axis control current command value, using command value converting means,
- a step of comparing between an alternating current detected value as alternating current component detected by said current detecting means without being converted by said current converting means and said evaluation current command value, and
- a step of determining that said current detecting means is incorrect if the result of comparison has exceeded a threshold value.
An electric car control method comprising;
- a step of regulating the amplitude and phase of the primary current to be supplied to an alternating current motor and controlling the speed or torque of said alternating current motor, by dq-axis vector current control which provides separate and independent control of the primary current supplied to the stator of said alternating current motor, namely, a q-axis current component as a torque component based on a q-axis control current command value and a d-axis current component as an exciting component based on a d-axis control current command value,
- a step of applying said primary current to said alternating current motor and controlling it through electric power converting means, and
- a step of detecting said primary current to said alternating current motor an alternating current detected value through current detecting means:
- said electric car control method comprising;
- a step of providing feedback current control by detecting said primary current as a q-axis current detected value and a d-axis current detected value and converting it through current converting means, and by comparing between said q-axis control current command value and said q-axis current detected value, and between said d-axis control current command value and said d-axis current detected value,
- a step of generating an evaluation current command value for comparison and evaluation independently of said feedback control current command value based on said q-axis control current command value and said d-axis control current command value,
- a step of comparing said alternating current detected value as an alternating current component detected by said current detecting means without being converted, and said evaluation current command value, and
- a step of determining that said current detecting means is incorrect if the result of comparison exceeds a threshold value.
Dependencies are inferred from the claim text.