Vehicular electronic control apparatus
First Claim
1. A vehicular electronic control apparatus comprising a nonvolatile program memory in which at least a control program suitable for a vehicle to be controlled is stored, a nonvolatile data memory in which at least variable control data are stored, a RAM for arithmetic processing, and a microprocessor connected to the nonvolatile program memory, the nonvolatile data memory and the RAM, for controlling vehicle electric loads on the basis of input signals from vehicle sensors, the control program stored in the nonvolatile program memory, and the variable control data stored in the nonvolatile data memory,the vehicular electronic control apparatus further comprising a reference data storage memory, data memory abnormality judgment means for the nonvolatile data memory, and a first and second transfer means for the RAM, wherein the reference data storage memory comprises an electrically writable nonvolatile memory in which reference data corresponding to the variable control data stored in the nonvolatile data memory are stored, the data memory abnormality judging means is constructed to judge whether the variable control data stored in the nonvolatile data memory are normal or abnormal;
- the first transfer means comprises means for transferring and writing the variable control data from the nonvolatile data memory to the RAM if the data memory abnormality judging means judges that the variable control data stored in the nonvolatile data memory are normal, the second transfer means comprises means for writing estimated variable control data based on the reference data from the reference data storage memory to the RAM if the data memory abnormality judging means judges that the variable control data stored in the nonvolatile data memory are abnormal, and the microprocessor controls the vehicle electric loads on the basis of one of the variable control data and the estimated variable control data that have been written to the RAM.
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Accused Products
Abstract
A vehicular electronic control apparatus is provided with a program memory, a data memory, a RAM, a microprocesser, a reference data storage memory, a data memory abnormality judging section, and at least two transfer sections for a RAM. The reference data storage memory stores reference data corresponding to variable control data stored in the data memory. The data memory abnormality judging section judges whether the variable control data stored in the data memory are normal or abnormal. The first transfer section transfers and writes the variable control data from the data memory to the RAM. The second transfer section writes estimated variable control data based on the reference data from the reference data storage memory to the RAM.
13 Citations
20 Claims
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1. A vehicular electronic control apparatus comprising a nonvolatile program memory in which at least a control program suitable for a vehicle to be controlled is stored, a nonvolatile data memory in which at least variable control data are stored, a RAM for arithmetic processing, and a microprocessor connected to the nonvolatile program memory, the nonvolatile data memory and the RAM, for controlling vehicle electric loads on the basis of input signals from vehicle sensors, the control program stored in the nonvolatile program memory, and the variable control data stored in the nonvolatile data memory,
the vehicular electronic control apparatus further comprising a reference data storage memory, data memory abnormality judgment means for the nonvolatile data memory, and a first and second transfer means for the RAM, wherein the reference data storage memory comprises an electrically writable nonvolatile memory in which reference data corresponding to the variable control data stored in the nonvolatile data memory are stored, the data memory abnormality judging means is constructed to judge whether the variable control data stored in the nonvolatile data memory are normal or abnormal; -
the first transfer means comprises means for transferring and writing the variable control data from the nonvolatile data memory to the RAM if the data memory abnormality judging means judges that the variable control data stored in the nonvolatile data memory are normal, the second transfer means comprises means for writing estimated variable control data based on the reference data from the reference data storage memory to the RAM if the data memory abnormality judging means judges that the variable control data stored in the nonvolatile data memory are abnormal, and the microprocessor controls the vehicle electric loads on the basis of one of the variable control data and the estimated variable control data that have been written to the RAM. - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 11, 12, 17, 18, 19, 20)
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2. A vehicular electronic control apparatus comprising a nonvolatile program memory in which at least a control program suitable for a vehicle to be controlled is stored, a nonvolatile data memory in which at least variable control data are stored, the nonvolatile data memory including first and second data memories in which at least parts of the variable control data are stored in a duplicated manner, a RAM for arithmetic processing, and a microprocessor connected to the nonvolatile program memory, the nonvolatile data memory and the RAM, for controlling vehicle electric loads on the basis of input signals from vehicle sensors, the control program stored in the nonvolatile program memory, and the variable control data stored in the nonvolatile data memory,
the vehicular electronic control apparatus further comprising a reference data storage memory, data memory abnormality judging means for the nonvolatile data memory, and first, second and third transfer means for the RAM, wherein the reference data storage memory comprises an electrically writable nonvolatile memory in which reference data corresponding to the parts of the variable control data stored in the first and second data memories are stored, the data memory abnormality judging means comprises means for the first and second data memories for judging whether the parts of the variable control data stored in the first data memory and those stored in the second data memory are normal or abnormal, the first transfer means comprises means for transferring and writing the parts of the variable control data from one of the first and second data memories to the RAM if the data memory abnormality judging means judges that the parts of the variable control data stored in the first data memory and those stored in the second data memory are both normal, the second transfer means comprises means for writing estimated variable control data based on the reference data from the reference data storage memory to the RAM if the data memory abnormality judging means judges that the parts of the variable control data stored in the first data memory and those stored in the second data memory are both abnormal, the third transfer means comprises means for transferring and writing, if the data memory abnormality judging means judges that one of the parts of the variable control data stored in the first data memory and those stored in the second data memory is abnormal, the parts of the variable control data stored in a normal one of the first and second data memories to the RAM, and the microprocessor controls the vehicle electric loads on the basis of one of the variable control data and the estimated variable control data that have been written to the RAM.
Specification